Merge branch 'master' into 'enable-auto-cancelling-by-default'enable-auto-cancelling-by-default

# Conflicts:
#   spec/workers/post_receive_spec.rb

461 files changed, 10519 insertions, 2399 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2686d778b09..e625278a796 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,18 @@
 documentation](doc/development/changelog.md) for instructions on adding your own
 entry.
 
+## 9.1.3 (2017-05-05)
+
+- Do not show private groups on subgroups page if user doesn't have access to.
+- Enforce project features when searching blobs and wikis.
+- Fixed branches dropdown rendering branch names as HTML.
+- Make Asciidoc & other markup go through pipeline to prevent XSS.
+- Validate URLs in markdown using URI to detect the host correctly.
+- Fix for XSS in project import view caused by Hamlit filter usage.
+- Sanitize submodule URLs before linking to them in the file tree view.
+- Refactor snippets finder & dont return internal snippets for external users.
+- Fix snippets visibility for show action - external users can not see internal snippets.
+
 ## 9.1.2 (2017-05-01)
 
 - Add index on ci_runners.contacted_at. !10876 (blackst0ne)
@@ -276,6 +288,18 @@ entry.
 - Only send chat notifications for the default branch.
 - Don't fill in the default kubernetes namespace.
 
+## 9.0.7 (2017-05-05)
+
+- Enforce project features when searching blobs and wikis.
+- Fixed branches dropdown rendering branch names as HTML.
+- Make Asciidoc & other markup go through pipeline to prevent XSS.
+- Validate URLs in markdown using URI to detect the host correctly.
+- Fix for XSS in project import view caused by Hamlit filter usage.
+- Sanitize submodule URLs before linking to them in the file tree view.
+- Refactor snippets finder & dont return internal snippets for external users.
+- Fix snippets visibility for show action - external users can not see internal snippets.
+- Do not show private groups on subgroups page if user doesn't have access to.
+
 ## 9.0.6 (2017-04-21)
 
 - Bugfix: POST /projects/:id/hooks and PUT /projects/:id/hook/:hook_id no longer ignore the the job_events param in the V4 API. !10586
@@ -620,6 +644,17 @@ entry.
 - Change development tanuki favicon colors to match logo color order.
 - API issues - support filtering by iids.
 
+## 8.17.6 (2017-05-05)
+
+- Enforce project features when searching blobs and wikis.
+- Fixed branches dropdown rendering branch names as HTML.
+- Make Asciidoc & other markup go through pipeline to prevent XSS.
+- Validate URLs in markdown using URI to detect the host correctly.
+- Fix for XSS in project import view caused by Hamlit filter usage.
+- Sanitize submodule URLs before linking to them in the file tree view.
+- Refactor snippets finder & dont return internal snippets for external users.
+- Fix snippets visibility for show action - external users can not see internal snippets.
+
 ## 8.17.5 (2017-04-05)
 
 - Don’t show source project name when user does not have access.
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 600dad563a6..8b6c87ae518 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -21,7 +21,7 @@ _This notice should stay as the first item in the CONTRIBUTING.MD file._
 - [Workflow labels](#workflow-labels)
   - [Type labels (~"feature proposal", ~bug, ~customer, etc.)](#type-labels-feature-proposal-bug-customer-etc)
   - [Subject labels (~wiki, ~"container registry", ~ldap, ~api, etc.)](#subject-labels-wiki-container-registry-ldap-api-etc)
-  - [Team labels (~CI, ~Discussion, ~Edge, ~Frontend, ~Platform, etc.)](#team-labels-ci-discussion-edge-frontend-platform-etc)
+  - [Team labels (~CI, ~Discussion, ~Edge, ~Platform, etc.)](#team-labels-ci-discussion-edge-platform-etc)
   - [Priority labels (~Deliverable and ~Stretch)](#priority-labels-deliverable-and-stretch)
   - [Label for community contributors (~"Accepting Merge Requests")](#label-for-community-contributors-accepting-merge-requests)
 - [Implement design & UI elements](#implement-design--ui-elements)
@@ -155,18 +155,21 @@ Examples of subject labels are ~wiki, ~"container registry", ~ldap, ~api,
 
 Subject labels are always all-lowercase.
 
-### Team labels (~CI, ~Discussion, ~Edge, ~Frontend, ~Platform, etc.)
+### Team labels (~CI, ~Discussion, ~Edge, ~Platform, etc.)
 
 Team labels specify what team is responsible for this issue.
 Assigning a team label makes sure issues get the attention of the appropriate
 people.
 
 The current team labels are ~Build, ~CI, ~Discussion, ~Documentation, ~Edge,
-~Frontend, ~Gitaly, ~Platform, ~Prometheus, ~Release, and ~"UX".
+~Gitaly, ~Platform, ~Prometheus, ~Release, and ~"UX".
 
 The descriptions on the [labels page][labels-page] explain what falls under the
 responsibility of each team.
 
+Within those team labels, we also have the ~backend and ~frontend labels to
+indicate if an issue needs backend work, frontend work, or both.
+
 Team labels are always capitalized so that they show up as the first label for
 any issue.
 
diff --git a/GITLAB_PAGES_VERSION b/GITLAB_PAGES_VERSION
index 267577d47e4..2b7c5ae0184 100644
--- a/GITLAB_PAGES_VERSION
+++ b/GITLAB_PAGES_VERSION
@@ -1 +1 @@
-0.4.1
+0.4.2
diff --git a/Gemfile b/Gemfile
index 9426a558612..5dbb0bdfddb 100644
--- a/Gemfile
+++ b/Gemfile
@@ -257,6 +257,7 @@ gem 'sentry-raven', '~> 2.4.0'
 gem 'premailer-rails', '~> 1.9.0'
 
 # I18n
+gem 'ruby_parser', '~> 3.8.4', require: false
 gem 'gettext_i18n_rails', '~> 1.8.0'
 gem 'gettext_i18n_rails_js', '~> 1.2.0'
 gem 'gettext', '~> 3.2.2', require: false, group: :development
diff --git a/Gemfile.lock b/Gemfile.lock
index c7e3f9935da..01c35a935f2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1012,6 +1012,7 @@ DEPENDENCIES
   rubocop-rspec (~> 1.15.0)
   ruby-fogbugz (~> 0.2.1)
   ruby-prof (~> 0.16.2)
+  ruby_parser (~> 3.8.4)
   rufus-scheduler (~> 3.1.10)
   rugged (~> 0.25.1.1)
   sanitize (~> 2.0)
diff --git a/app/assets/javascripts/autosave.js b/app/assets/javascripts/autosave.js
index 8630b18a73f..cfab6c40b34 100644
--- a/app/assets/javascripts/autosave.js
+++ b/app/assets/javascripts/autosave.js
@@ -1,8 +1,11 @@
 /* eslint-disable func-names, space-before-function-paren, wrap-iife, no-param-reassign, quotes, prefer-template, no-var, one-var, no-unused-vars, one-var-declaration-per-line, no-void, consistent-return, no-empty, max-len */
+import AccessorUtilities from './lib/utils/accessor';
 
 window.Autosave = (function() {
   function Autosave(field, key) {
     this.field = field;
+    this.isLocalStorageAvailable = AccessorUtilities.isLocalStorageAccessSafe();
+
     if (key.join != null) {
       key = key.join("/");
     }
@@ -17,16 +20,12 @@ window.Autosave = (function() {
   }
 
   Autosave.prototype.restore = function() {
-    var e, text;
-    if (window.localStorage == null) {
-      return;
-    }
-    try {
-      text = window.localStorage.getItem(this.key);
-    } catch (error) {
-      e = error;
-      return;
-    }
+    var text;
+
+    if (!this.isLocalStorageAvailable) return;
+
+    text = window.localStorage.getItem(this.key);
+
     if ((text != null ? text.length : void 0) > 0) {
       this.field.val(text);
     }
@@ -35,27 +34,22 @@ window.Autosave = (function() {
 
   Autosave.prototype.save = function() {
     var text;
-    if (window.localStorage == null) {
-      return;
-    }
     text = this.field.val();
-    if ((text != null ? text.length : void 0) > 0) {
-      try {
-        return window.localStorage.setItem(this.key, text);
-      } catch (error) {}
-    } else {
-      return this.reset();
+
+    if (this.isLocalStorageAvailable && (text != null ? text.length : void 0) > 0) {
+      return window.localStorage.setItem(this.key, text);
     }
+
+    return this.reset();
   };
 
   Autosave.prototype.reset = function() {
-    if (window.localStorage == null) {
-      return;
-    }
-    try {
-      return window.localStorage.removeItem(this.key);
-    } catch (error) {}
+    if (!this.isLocalStorageAvailable) return;
+
+    return window.localStorage.removeItem(this.key);
   };
 
   return Autosave;
 })();
+
+export default window.Autosave;
diff --git a/app/assets/javascripts/behaviors/gl_emoji/unicode_support_map.js b/app/assets/javascripts/behaviors/gl_emoji/unicode_support_map.js
index aa522e20c36..257df55e54f 100644
--- a/app/assets/javascripts/behaviors/gl_emoji/unicode_support_map.js
+++ b/app/assets/javascripts/behaviors/gl_emoji/unicode_support_map.js
@@ -1,3 +1,5 @@
+import AccessorUtilities from '../../lib/utils/accessor';
+
 const unicodeSupportTestMap = {
   // man, student (emojione does not have any of these yet), http://emojipedia.org/emoji-zwj-sequences/
   // occupationZwj: '\u{1F468}\u{200D}\u{1F393}',
@@ -140,16 +142,25 @@ function generateUnicodeSupportMap(testMap) {
 
 function getUnicodeSupportMap() {
   let unicodeSupportMap;
-  const userAgentFromCache = window.localStorage.getItem('gl-emoji-user-agent');
+  let userAgentFromCache;
+
+  const isLocalStorageAvailable = AccessorUtilities.isLocalStorageAccessSafe();
+
+  if (isLocalStorageAvailable) userAgentFromCache = window.localStorage.getItem('gl-emoji-user-agent');
+
   try {
     unicodeSupportMap = JSON.parse(window.localStorage.getItem('gl-emoji-unicode-support-map'));
   } catch (err) {
     // swallow
   }
+
   if (!unicodeSupportMap || userAgentFromCache !== navigator.userAgent) {
     unicodeSupportMap = generateUnicodeSupportMap(unicodeSupportTestMap);
-    window.localStorage.setItem('gl-emoji-user-agent', navigator.userAgent);
-    window.localStorage.setItem('gl-emoji-unicode-support-map', JSON.stringify(unicodeSupportMap));
+
+    if (isLocalStorageAvailable) {
+      window.localStorage.setItem('gl-emoji-user-agent', navigator.userAgent);
+      window.localStorage.setItem('gl-emoji-unicode-support-map', JSON.stringify(unicodeSupportMap));
+    }
   }
 
   return unicodeSupportMap;
diff --git a/app/assets/javascripts/blob/balsamiq/balsamiq_viewer.js b/app/assets/javascripts/blob/balsamiq/balsamiq_viewer.js
new file mode 100644
index 00000000000..cdbfe36ca1c
--- /dev/null
+++ b/app/assets/javascripts/blob/balsamiq/balsamiq_viewer.js
@@ -0,0 +1,114 @@
+/* global Flash */
+
+import sqljs from 'sql.js';
+import { template as _template } from 'underscore';
+
+const PREVIEW_TEMPLATE = _template(`
+  <div class="panel panel-default">
+    <div class="panel-heading"><%- name %></div>
+    <div class="panel-body">
+      <img class="img-thumbnail" src="data:image/png;base64,<%- image %>"/>
+    </div>
+  </div>
+`);
+
+class BalsamiqViewer {
+  constructor(viewer) {
+    this.viewer = viewer;
+    this.endpoint = this.viewer.dataset.endpoint;
+  }
+
+  loadFile() {
+    const xhr = new XMLHttpRequest();
+
+    xhr.open('GET', this.endpoint, true);
+    xhr.responseType = 'arraybuffer';
+
+    xhr.onload = this.renderFile.bind(this);
+    xhr.onerror = BalsamiqViewer.onError;
+
+    xhr.send();
+  }
+
+  renderFile(loadEvent) {
+    const container = document.createElement('ul');
+
+    this.initDatabase(loadEvent.target.response);
+
+    const previews = this.getPreviews();
+    previews.forEach((preview) => {
+      const renderedPreview = this.renderPreview(preview);
+
+      container.appendChild(renderedPreview);
+    });
+
+    container.classList.add('list-inline');
+    container.classList.add('previews');
+
+    this.viewer.appendChild(container);
+  }
+
+  initDatabase(data) {
+    const previewBinary = new Uint8Array(data);
+
+    this.database = new sqljs.Database(previewBinary);
+  }
+
+  getPreviews() {
+    const thumbnails = this.database.exec('SELECT * FROM thumbnails');
+
+    return thumbnails[0].values.map(BalsamiqViewer.parsePreview);
+  }
+
+  getResource(resourceID) {
+    const resources = this.database.exec(`SELECT * FROM resources WHERE id = '${resourceID}'`);
+
+    return resources[0];
+  }
+
+  renderPreview(preview) {
+    const previewElement = document.createElement('li');
+
+    previewElement.classList.add('preview');
+    previewElement.innerHTML = this.renderTemplate(preview);
+
+    return previewElement;
+  }
+
+  renderTemplate(preview) {
+    const resource = this.getResource(preview.resourceID);
+    const name = BalsamiqViewer.parseTitle(resource);
+    const image = preview.image;
+
+    const template = PREVIEW_TEMPLATE({
+      name,
+      image,
+    });
+
+    return template;
+  }
+
+  static parsePreview(preview) {
+    return JSON.parse(preview[1]);
+  }
+
+  /*
+   * resource = {
+   *   columns: ['ID', 'BRANCHID', 'ATTRIBUTES', 'DATA'],
+   *   values: [['id', 'branchId', 'attributes', 'data']],
+   * }
+   *
+   * 'attributes' being a JSON string containing the `name` property.
+   */
+  static parseTitle(resource) {
+    return JSON.parse(resource.values[0][2]).name;
+  }
+
+  static onError() {
+    const flash = new Flash('Balsamiq file could not be loaded.');
+
+    return flash;
+  }
+}
+
+export default BalsamiqViewer;
diff --git a/app/assets/javascripts/blob/balsamiq_viewer.js b/app/assets/javascripts/blob/balsamiq_viewer.js
new file mode 100644
index 00000000000..1dacf84470f
--- /dev/null
+++ b/app/assets/javascripts/blob/balsamiq_viewer.js
@@ -0,0 +1,6 @@
+import BalsamiqViewer from './balsamiq/balsamiq_viewer';
+
+document.addEventListener('DOMContentLoaded', () => {
+  const balsamiqViewer = new BalsamiqViewer(document.getElementById('js-balsamiq-viewer'));
+  balsamiqViewer.loadFile();
+});
diff --git a/app/assets/javascripts/blob/file_template_mediator.js b/app/assets/javascripts/blob/file_template_mediator.js
index 3062cd51ee3..a20c6ca7a21 100644
--- a/app/assets/javascripts/blob/file_template_mediator.js
+++ b/app/assets/javascripts/blob/file_template_mediator.js
@@ -99,7 +99,7 @@ export default class FileTemplateMediator {
     });
   }
 
-  selectTemplateType(item, el, e) {
+  selectTemplateType(item, e) {
     if (e) {
       e.preventDefault();
     }
@@ -117,6 +117,10 @@ export default class FileTemplateMediator {
     this.cacheToggleText();
   }
 
+  selectTemplateTypeOptions(options) {
+    this.selectTemplateType(options.selectedObj, options.e);
+  }
+
   selectTemplateFile(selector, query, data) {
     selector.renderLoading();
     // in case undo menu is already already there
diff --git a/app/assets/javascripts/blob/file_template_selector.js b/app/assets/javascripts/blob/file_template_selector.js
index 31dd45fac89..ab5b3751c4e 100644
--- a/app/assets/javascripts/blob/file_template_selector.js
+++ b/app/assets/javascripts/blob/file_template_selector.js
@@ -52,9 +52,17 @@ export default class FileTemplateSelector {
       .removeClass('fa-spinner fa-spin');
   }
 
-  reportSelection(query, el, e, data) {
+  reportSelection(options) {
+    const { query, e, data } = options;
     e.preventDefault();
     return this.mediator.selectTemplateFile(this, query, data);
   }
+
+  reportSelectionName(options) {
+    const opts = options;
+    opts.query = options.selectedObj.name;
+
+    this.reportSelection(opts);
+  }
 }
 
diff --git a/app/assets/javascripts/blob/target_branch_dropdown.js b/app/assets/javascripts/blob/target_branch_dropdown.js
index 216f069ef71..d52d69b1274 100644
--- a/app/assets/javascripts/blob/target_branch_dropdown.js
+++ b/app/assets/javascripts/blob/target_branch_dropdown.js
@@ -37,8 +37,8 @@ class TargetBranchDropDown {
         }
         return SELECT_ITEM_MSG;
       },
-      clicked(item, el, e) {
-        e.preventDefault();
+      clicked(options) {
+        options.e.preventDefault();
         self.onClick.call(self);
       },
       fieldName: self.fieldName,
diff --git a/app/assets/javascripts/blob/template_selector.js b/app/assets/javascripts/blob/template_selector.js
index d7c1c32efbd..888883163c5 100644
--- a/app/assets/javascripts/blob/template_selector.js
+++ b/app/assets/javascripts/blob/template_selector.js
@@ -24,7 +24,7 @@ export default class TemplateSelector {
       search: {
         fields: ['name'],
       },
-      clicked: (item, el, e) => this.fetchFileTemplate(item, el, e),
+      clicked: options => this.fetchFileTemplate(options),
       text: item => item.name,
     });
   }
@@ -51,7 +51,10 @@ export default class TemplateSelector {
     return this.$dropdownContainer.removeClass('hidden');
   }
 
-  fetchFileTemplate(item, el, e) {
+  fetchFileTemplate(options) {
+    const { e } = options;
+    const item = options.selectedObj;
+
     e.preventDefault();
     return this.requestFile(item);
   }
diff --git a/app/assets/javascripts/blob/template_selectors/ci_yaml_selector.js b/app/assets/javascripts/blob/template_selectors/ci_yaml_selector.js
index 935df07677c..f2f81af137b 100644
--- a/app/assets/javascripts/blob/template_selectors/ci_yaml_selector.js
+++ b/app/assets/javascripts/blob/template_selectors/ci_yaml_selector.js
@@ -25,7 +25,7 @@ export default class BlobCiYamlSelector extends FileTemplateSelector {
       search: {
         fields: ['name'],
       },
-      clicked: (query, el, e) => this.reportSelection(query.name, el, e),
+      clicked: options => this.reportSelectionName(options),
       text: item => item.name,
     });
   }
diff --git a/app/assets/javascripts/blob/template_selectors/dockerfile_selector.js b/app/assets/javascripts/blob/template_selectors/dockerfile_selector.js
index b4b4d09c315..3cb7b960aaa 100644
--- a/app/assets/javascripts/blob/template_selectors/dockerfile_selector.js
+++ b/app/assets/javascripts/blob/template_selectors/dockerfile_selector.js
@@ -25,7 +25,7 @@ export default class DockerfileSelector extends FileTemplateSelector {
       search: {
         fields: ['name'],
       },
-      clicked: (query, el, e) => this.reportSelection(query.name, el, e),
+      clicked: options => this.reportSelectionName(options),
       text: item => item.name,
     });
   }
diff --git a/app/assets/javascripts/blob/template_selectors/gitignore_selector.js b/app/assets/javascripts/blob/template_selectors/gitignore_selector.js
index aefae54ae71..7efda8e7f50 100644
--- a/app/assets/javascripts/blob/template_selectors/gitignore_selector.js
+++ b/app/assets/javascripts/blob/template_selectors/gitignore_selector.js
@@ -24,7 +24,7 @@ export default class BlobGitignoreSelector extends FileTemplateSelector {
       search: {
         fields: ['name'],
       },
-      clicked: (query, el, e) => this.reportSelection(query.name, el, e),
+      clicked: options => this.reportSelectionName(options),
       text: item => item.name,
     });
   }
diff --git a/app/assets/javascripts/blob/template_selectors/license_selector.js b/app/assets/javascripts/blob/template_selectors/license_selector.js
index c8abd689ab4..1d757332f6c 100644
--- a/app/assets/javascripts/blob/template_selectors/license_selector.js
+++ b/app/assets/javascripts/blob/template_selectors/license_selector.js
@@ -24,13 +24,22 @@ export default class BlobLicenseSelector extends FileTemplateSelector {
       search: {
         fields: ['name'],
       },
-      clicked: (query, el, e) => {
+      clicked: (options) => {
+        const { e } = options;
+        const el = options.$el;
+        const query = options.selectedObj;
+
         const data = {
           project: this.$dropdown.data('project'),
           fullname: this.$dropdown.data('fullname'),
         };
 
-        this.reportSelection(query.id, el, e, data);
+        this.reportSelection({
+          query: query.id,
+          el,
+          e,
+          data,
+        });
       },
       text: item => item.name,
     });
diff --git a/app/assets/javascripts/blob/template_selectors/type_selector.js b/app/assets/javascripts/blob/template_selectors/type_selector.js
index 56f23ef0568..a09381014a7 100644
--- a/app/assets/javascripts/blob/template_selectors/type_selector.js
+++ b/app/assets/javascripts/blob/template_selectors/type_selector.js
@@ -17,7 +17,7 @@ export default class FileTemplateTypeSelector extends FileTemplateSelector {
       filterable: false,
       selectable: true,
       toggleLabel: item => item.name,
-      clicked: (item, el, e) => this.mediator.selectTemplateType(item, el, e),
+      clicked: options => this.mediator.selectTemplateTypeOptions(options),
       text: item => item.name,
     });
   }
diff --git a/app/assets/javascripts/boards/boards_bundle.js b/app/assets/javascripts/boards/boards_bundle.js
index 8c08b2d4db3..88eb4251339 100644
--- a/app/assets/javascripts/boards/boards_bundle.js
+++ b/app/assets/javascripts/boards/boards_bundle.js
@@ -11,7 +11,7 @@ require('./models/issue');
 require('./models/label');
 require('./models/list');
 require('./models/milestone');
-require('./models/user');
+require('./models/assignee');
 require('./stores/boards_store');
 require('./stores/modal_store');
 require('./services/board_service');
diff --git a/app/assets/javascripts/boards/components/board_new_issue.js b/app/assets/javascripts/boards/components/board_new_issue.js
index 0fa85b6fe14..1ce95b62138 100644
--- a/app/assets/javascripts/boards/components/board_new_issue.js
+++ b/app/assets/javascripts/boards/components/board_new_issue.js
@@ -26,6 +26,7 @@ export default {
         title: this.title,
         labels,
         subscribed: true,
+        assignees: [],
       });
 
       this.list.newIssue(issue)
diff --git a/app/assets/javascripts/boards/components/board_sidebar.js b/app/assets/javascripts/boards/components/board_sidebar.js
index f0066d4ec5d..317cef9f227 100644
--- a/app/assets/javascripts/boards/components/board_sidebar.js
+++ b/app/assets/javascripts/boards/components/board_sidebar.js
@@ -3,8 +3,13 @@
 /* global MilestoneSelect */
 /* global LabelsSelect */
 /* global Sidebar */
+/* global Flash */
 
 import Vue from 'vue';
+import eventHub from '../../sidebar/event_hub';
+
+import AssigneeTitle from '../../sidebar/components/assignees/assignee_title';
+import Assignees from '../../sidebar/components/assignees/assignees';
 
 require('./sidebar/remove_issue');
 
@@ -22,6 +27,7 @@ gl.issueBoards.BoardSidebar = Vue.extend({
       detail: Store.detail,
       issue: {},
       list: {},
+      loadingAssignees: false,
     };
   },
   computed: {
@@ -43,6 +49,10 @@ gl.issueBoards.BoardSidebar = Vue.extend({
 
         this.issue = this.detail.issue;
         this.list = this.detail.list;
+
+        this.$nextTick(() => {
+          this.endpoint = this.$refs.assigneeDropdown.dataset.issueUpdate;
+        });
       },
       deep: true
     },
@@ -53,12 +63,57 @@ gl.issueBoards.BoardSidebar = Vue.extend({
           $('.right-sidebar').getNiceScroll().resize();
         });
       }
-    }
+
+      this.issue = this.detail.issue;
+      this.list = this.detail.list;
+    },
+    deep: true
   },
   methods: {
     closeSidebar () {
       this.detail.issue = {};
-    }
+    },
+    assignSelf () {
+      // Notify gl dropdown that we are now assigning to current user
+      this.$refs.assigneeBlock.dispatchEvent(new Event('assignYourself'));
+
+      this.addAssignee(this.currentUser);
+      this.saveAssignees();
+    },
+    removeAssignee (a) {
+      gl.issueBoards.BoardsStore.detail.issue.removeAssignee(a);
+    },
+    addAssignee (a) {
+      gl.issueBoards.BoardsStore.detail.issue.addAssignee(a);
+    },
+    removeAllAssignees () {
+      gl.issueBoards.BoardsStore.detail.issue.removeAllAssignees();
+    },
+    saveAssignees () {
+      this.loadingAssignees = true;
+
+      gl.issueBoards.BoardsStore.detail.issue.update(this.endpoint)
+        .then(() => {
+          this.loadingAssignees = false;
+        })
+        .catch(() => {
+          this.loadingAssignees = false;
+          return new Flash('An error occurred while saving assignees');
+        });
+    },
+  },
+  created () {
+    // Get events from glDropdown
+    eventHub.$on('sidebar.removeAssignee', this.removeAssignee);
+    eventHub.$on('sidebar.addAssignee', this.addAssignee);
+    eventHub.$on('sidebar.removeAllAssignees', this.removeAllAssignees);
+    eventHub.$on('sidebar.saveAssignees', this.saveAssignees);
+  },
+  beforeDestroy() {
+    eventHub.$off('sidebar.removeAssignee', this.removeAssignee);
+    eventHub.$off('sidebar.addAssignee', this.addAssignee);
+    eventHub.$off('sidebar.removeAllAssignees', this.removeAllAssignees);
+    eventHub.$off('sidebar.saveAssignees', this.saveAssignees);
   },
   mounted () {
     new IssuableContext(this.currentUser);
@@ -70,5 +125,7 @@ gl.issueBoards.BoardSidebar = Vue.extend({
   },
   components: {
     removeBtn: gl.issueBoards.RemoveIssueBtn,
+    'assignee-title': AssigneeTitle,
+    assignees: Assignees,
   },
 });
diff --git a/app/assets/javascripts/boards/components/issue_card_inner.js b/app/assets/javascripts/boards/components/issue_card_inner.js
index fc154ee7b8b..710207db0c7 100644
--- a/app/assets/javascripts/boards/components/issue_card_inner.js
+++ b/app/assets/javascripts/boards/components/issue_card_inner.js
@@ -31,18 +31,36 @@ gl.issueBoards.IssueCardInner = Vue.extend({
       default: false,
     },
   },
+  data() {
+    return {
+      limitBeforeCounter: 3,
+      maxRender: 4,
+      maxCounter: 99,
+    };
+  },
   computed: {
-    cardUrl() {
-      return `${this.issueLinkBase}/${this.issue.id}`;
+    numberOverLimit() {
+      return this.issue.assignees.length - this.limitBeforeCounter;
     },
-    assigneeUrl() {
-      return `${this.rootPath}${this.issue.assignee.username}`;
+    assigneeCounterTooltip() {
+      return `${this.assigneeCounterLabel} more`;
+    },
+    assigneeCounterLabel() {
+      if (this.numberOverLimit > this.maxCounter) {
+        return `${this.maxCounter}+`;
+      }
+
+      return `+${this.numberOverLimit}`;
     },
-    assigneeUrlTitle() {
-      return `Assigned to ${this.issue.assignee.name}`;
+    shouldRenderCounter() {
+      if (this.issue.assignees.length <= this.maxRender) {
+        return false;
+      }
+
+      return this.issue.assignees.length > this.numberOverLimit;
     },
-    avatarUrlTitle() {
-      return `Avatar for ${this.issue.assignee.name}`;
+    cardUrl() {
+      return `${this.issueLinkBase}/${this.issue.id}`;
     },
     issueId() {
       return `#${this.issue.id}`;
@@ -52,6 +70,28 @@ gl.issueBoards.IssueCardInner = Vue.extend({
     },
   },
   methods: {
+    isIndexLessThanlimit(index) {
+      return index < this.limitBeforeCounter;
+    },
+    shouldRenderAssignee(index) {
+      // Eg. maxRender is 4,
+      // Render up to all 4 assignees if there are only 4 assigness
+      // Otherwise render up to the limitBeforeCounter
+      if (this.issue.assignees.length <= this.maxRender) {
+        return index < this.maxRender;
+      }
+
+      return index < this.limitBeforeCounter;
+    },
+    assigneeUrl(assignee) {
+      return `${this.rootPath}${assignee.username}`;
+    },
+    assigneeUrlTitle(assignee) {
+      return `Assigned to ${assignee.name}`;
+    },
+    avatarUrlTitle(assignee) {
+      return `Avatar for ${assignee.name}`;
+    },
     showLabel(label) {
       if (!this.list) return true;
 
@@ -105,25 +145,39 @@ gl.issueBoards.IssueCardInner = Vue.extend({
             {{ issueId }}
           </span>
         </h4>
-        <a
-          class="card-assignee has-tooltip js-no-trigger"
-          :href="assigneeUrl"
-          :title="assigneeUrlTitle"
-          v-if="issue.assignee"
-          data-container="body"
-        >
-          <img
-            class="avatar avatar-inline s20 js-no-trigger"
-            :src="issue.assignee.avatar"
-            width="20"
-            height="20"
-            :alt="avatarUrlTitle"
-          />
-        </a>
+        <div class="card-assignee">
+          <a
+            class="has-tooltip js-no-trigger"
+            :href="assigneeUrl(assignee)"
+            :title="assigneeUrlTitle(assignee)"
+            v-for="(assignee, index) in issue.assignees"
+            v-if="shouldRenderAssignee(index)"
+            data-container="body"
+            data-placement="bottom"
+          >
+            <img
+              class="avatar avatar-inline s20"
+              :src="assignee.avatar"
+              width="20"
+              height="20"
+              :alt="avatarUrlTitle(assignee)"
+            />
+          </a>
+          <span
+            class="avatar-counter has-tooltip"
+            :title="assigneeCounterTooltip"
+            v-if="shouldRenderCounter"
+          >
+           {{ assigneeCounterLabel }}
+          </span>
+        </div>
       </div>
-      <div class="card-footer" v-if="showLabelFooter">
+      <div
+        class="card-footer"
+        v-if="showLabelFooter"
+      >
         <button
-          class="label color-label has-tooltip js-no-trigger"
+          class="label color-label has-tooltip"
           v-for="label in issue.labels"
           type="button"
           v-if="showLabel(label)"
diff --git a/app/assets/javascripts/boards/components/new_list_dropdown.js b/app/assets/javascripts/boards/components/new_list_dropdown.js
index 7e3bb79af1d..f29b6caa1ac 100644
--- a/app/assets/javascripts/boards/components/new_list_dropdown.js
+++ b/app/assets/javascripts/boards/components/new_list_dropdown.js
@@ -52,7 +52,9 @@ gl.issueBoards.newListDropdownInit = () => {
       filterable: true,
       selectable: true,
       multiSelect: true,
-      clicked (label, $el, e) {
+      clicked (options) {
+        const { e } = options;
+        const label = options.selectedObj;
         e.preventDefault();
 
         if (!Store.findList('title', label.title)) {
diff --git a/app/assets/javascripts/boards/models/user.js b/app/assets/javascripts/boards/models/assignee.js
index 2af583c3279..05dd449e4fd 100644
--- a/app/assets/javascripts/boards/models/user.js
+++ b/app/assets/javascripts/boards/models/assignee.js
@@ -1,4 +1,6 @@
-class ListUser {
+/* eslint-disable no-unused-vars */
+
+class ListAssignee {
   constructor(user, defaultAvatar) {
     this.id = user.id;
     this.name = user.name;
@@ -7,4 +9,4 @@ class ListUser {
   }
 }
 
-window.ListUser = ListUser;
+window.ListAssignee = ListAssignee;
diff --git a/app/assets/javascripts/boards/models/issue.js b/app/assets/javascripts/boards/models/issue.js
index db783467f87..6c2d8a3781b 100644
--- a/app/assets/javascripts/boards/models/issue.js
+++ b/app/assets/javascripts/boards/models/issue.js
@@ -1,7 +1,7 @@
 /* eslint-disable no-unused-vars, space-before-function-paren, arrow-body-style, arrow-parens, comma-dangle, max-len */
 /* global ListLabel */
 /* global ListMilestone */
-/* global ListUser */
+/* global ListAssignee */
 
 import Vue from 'vue';
 
@@ -14,14 +14,10 @@ class ListIssue {
     this.dueDate = obj.due_date;
     this.subscribed = obj.subscribed;
     this.labels = [];
+    this.assignees = [];
     this.selected = false;
-    this.assignee = false;
     this.position = obj.relative_position || Infinity;
 
-    if (obj.assignee) {
-      this.assignee = new ListUser(obj.assignee, defaultAvatar);
-    }
-
     if (obj.milestone) {
       this.milestone = new ListMilestone(obj.milestone);
     }
@@ -29,6 +25,8 @@ class ListIssue {
     obj.labels.forEach((label) => {
       this.labels.push(new ListLabel(label));
     });
+
+    this.assignees = obj.assignees.map(a => new ListAssignee(a, defaultAvatar));
   }
 
   addLabel (label) {
@@ -51,6 +49,26 @@ class ListIssue {
     labels.forEach(this.removeLabel.bind(this));
   }
 
+  addAssignee (assignee) {
+    if (!this.findAssignee(assignee)) {
+      this.assignees.push(new ListAssignee(assignee));
+    }
+  }
+
+  findAssignee (findAssignee) {
+    return this.assignees.filter(assignee => assignee.id === findAssignee.id)[0];
+  }
+
+  removeAssignee (removeAssignee) {
+    if (removeAssignee) {
+      this.assignees = this.assignees.filter(assignee => assignee.id !== removeAssignee.id);
+    }
+  }
+
+  removeAllAssignees () {
+    this.assignees = [];
+  }
+
   getLists () {
     return gl.issueBoards.BoardsStore.state.lists.filter(list => list.findIssue(this.id));
   }
@@ -60,7 +78,7 @@ class ListIssue {
       issue: {
         milestone_id: this.milestone ? this.milestone.id : null,
         due_date: this.dueDate,
-        assignee_id: this.assignee ? this.assignee.id : null,
+        assignee_ids: this.assignees.length > 0 ? this.assignees.map((u) => u.id) : [0],
         label_ids: this.labels.map((label) => label.id)
       }
     };
diff --git a/app/assets/javascripts/dispatcher.js b/app/assets/javascripts/dispatcher.js
index b87c57c38fe..b16ff2a0221 100644
--- a/app/assets/javascripts/dispatcher.js
+++ b/app/assets/javascripts/dispatcher.js
@@ -252,6 +252,7 @@ const ShortcutsBlob = require('./shortcuts_blob');
           }
           break;
         case 'projects:pipelines:builds':
+        case 'projects:pipelines:failures':
         case 'projects:pipelines:show':
           const { controllerAction } = document.querySelector('.js-pipeline-container').dataset;
           const pipelineStatusUrl = `${document.querySelector('.js-pipeline-tab-link a').getAttribute('href')}/status.json`;
diff --git a/app/assets/javascripts/droplab/constants.js b/app/assets/javascripts/droplab/constants.js
index 8883ed9aa14..868d47e91b3 100644
--- a/app/assets/javascripts/droplab/constants.js
+++ b/app/assets/javascripts/droplab/constants.js
@@ -3,11 +3,14 @@ const DATA_DROPDOWN = 'data-dropdown';
 const SELECTED_CLASS = 'droplab-item-selected';
 const ACTIVE_CLASS = 'droplab-item-active';
 const IGNORE_CLASS = 'droplab-item-ignore';
+// Matches `{{anything}}` and `{{ everything }}`.
+const TEMPLATE_REGEX = /\{\{(.+?)\}\}/g;
 
 export {
   DATA_TRIGGER,
   DATA_DROPDOWN,
   SELECTED_CLASS,
   ACTIVE_CLASS,
+  TEMPLATE_REGEX,
   IGNORE_CLASS,
 };
diff --git a/app/assets/javascripts/droplab/drop_down.js b/app/assets/javascripts/droplab/drop_down.js
index 1fb4d63923c..de3927d683c 100644
--- a/app/assets/javascripts/droplab/drop_down.js
+++ b/app/assets/javascripts/droplab/drop_down.js
@@ -94,7 +94,7 @@ Object.assign(DropDown.prototype, {
   },
 
   renderChildren: function(data) {
-    var html = utils.t(this.templateString, data);
+    var html = utils.template(this.templateString, data);
     var template = document.createElement('div');
 
     template.innerHTML = html;
diff --git a/app/assets/javascripts/droplab/utils.js b/app/assets/javascripts/droplab/utils.js
index c149a33a1e9..4da7344604e 100644
--- a/app/assets/javascripts/droplab/utils.js
+++ b/app/assets/javascripts/droplab/utils.js
@@ -1,19 +1,19 @@
 /* eslint-disable */
 
-import { DATA_TRIGGER, DATA_DROPDOWN } from './constants';
+import { template as _template } from 'underscore';
+import { DATA_TRIGGER, DATA_DROPDOWN, TEMPLATE_REGEX } from './constants';
 
 const utils = {
   toCamelCase(attr) {
     return this.camelize(attr.split('-').slice(1).join(' '));
   },
 
-  t(s, d) {
-    for (const p in d) {
-      if (Object.prototype.hasOwnProperty.call(d, p)) {
-        s = s.replace(new RegExp(`{{${p}}}`, 'g'), d[p]);
-      }
-    }
-    return s;
+  template(templateString, data) {
+    const template = _template(templateString, {
+      escape: TEMPLATE_REGEX,
+    });
+
+    return template(data);
   },
 
   camelize(str) {
diff --git a/app/assets/javascripts/filtered_search/components/recent_searches_dropdown_content.js b/app/assets/javascripts/filtered_search/components/recent_searches_dropdown_content.js
index 9126422b335..15052dbd362 100644
--- a/app/assets/javascripts/filtered_search/components/recent_searches_dropdown_content.js
+++ b/app/assets/javascripts/filtered_search/components/recent_searches_dropdown_content.js
@@ -8,6 +8,11 @@ export default {
       type: Array,
       required: true,
     },
+    isLocalStorageAvailable: {
+      type: Boolean,
+      required: false,
+      default: true,
+    },
   },
 
   computed: {
@@ -47,7 +52,12 @@ export default {
 
   template: `
     <div>
-      <ul v-if="hasItems">
+      <div
+        v-if="!isLocalStorageAvailable"
+        class="dropdown-info-note">
+        This feature requires local storage to be enabled
+      </div>
+      <ul v-else-if="hasItems">
         <li
           v-for="(item, index) in processedItems"
           :key="index">
diff --git a/app/assets/javascripts/filtered_search/dropdown_hint.js b/app/assets/javascripts/filtered_search/dropdown_hint.js
index 3e7a892756c..5e9434fd48f 100644
--- a/app/assets/javascripts/filtered_search/dropdown_hint.js
+++ b/app/assets/javascripts/filtered_search/dropdown_hint.js
@@ -62,7 +62,7 @@ class DropdownHint extends gl.FilteredSearchDropdown {
           Object.assign({
             icon: `fa-${icon}`,
             hint,
-            tag: `&lt;${tag}&gt;`,
+            tag: `<${tag}>`,
           }, type && { type }),
         );
       }
diff --git a/app/assets/javascripts/filtered_search/filtered_search_manager.js b/app/assets/javascripts/filtered_search/filtered_search_manager.js
index 36af0674ac6..9fea563370f 100644
--- a/app/assets/javascripts/filtered_search/filtered_search_manager.js
+++ b/app/assets/javascripts/filtered_search/filtered_search_manager.js
@@ -1,5 +1,3 @@
-/* global Flash */
-
 import FilteredSearchContainer from './container';
 import RecentSearchesRoot from './recent_searches_root';
 import RecentSearchesStore from './stores/recent_searches_store';
@@ -15,7 +13,9 @@ class FilteredSearchManager {
     this.tokensContainer = this.container.querySelector('.tokens-container');
     this.filteredSearchTokenKeys = gl.FilteredSearchTokenKeys;
 
-    this.recentSearchesStore = new RecentSearchesStore();
+    this.recentSearchesStore = new RecentSearchesStore({
+      isLocalStorageAvailable: RecentSearchesService.isAvailable(),
+    });
     let recentSearchesKey = 'issue-recent-searches';
     if (page === 'merge_requests') {
       recentSearchesKey = 'merge-request-recent-searches';
@@ -24,9 +24,10 @@ class FilteredSearchManager {
 
     // Fetch recent searches from localStorage
     this.fetchingRecentSearchesPromise = this.recentSearchesService.fetch()
-      .catch(() => {
+      .catch((error) => {
+        if (error.name === 'RecentSearchesServiceError') return undefined;
         // eslint-disable-next-line no-new
-        new Flash('An error occured while parsing recent searches');
+        new window.Flash('An error occured while parsing recent searches');
         // Gracefully fail to empty array
         return [];
       })
diff --git a/app/assets/javascripts/filtered_search/filtered_search_visual_tokens.js b/app/assets/javascripts/filtered_search/filtered_search_visual_tokens.js
index 453ecccc6fc..f3003b86493 100644
--- a/app/assets/javascripts/filtered_search/filtered_search_visual_tokens.js
+++ b/app/assets/javascripts/filtered_search/filtered_search_visual_tokens.js
@@ -1,3 +1,5 @@
+import AjaxCache from '~/lib/utils/ajax_cache';
+import '~/flash'; /* global Flash */
 import FilteredSearchContainer from './container';
 
 class FilteredSearchVisualTokens {
@@ -48,6 +50,40 @@ class FilteredSearchVisualTokens {
     `;
   }
 
+  static updateLabelTokenColor(tokenValueContainer, tokenValue) {
+    const filteredSearchInput = FilteredSearchContainer.container.querySelector('.filtered-search');
+    const baseEndpoint = filteredSearchInput.dataset.baseEndpoint;
+    const labelsEndpoint = `${baseEndpoint}/labels.json`;
+
+    return AjaxCache.retrieve(labelsEndpoint)
+    .then((labels) => {
+      const matchingLabel = (labels || []).find(label => `~${gl.DropdownUtils.getEscapedText(label.title)}` === tokenValue);
+
+      if (!matchingLabel) {
+        return;
+      }
+
+      const tokenValueStyle = tokenValueContainer.style;
+      tokenValueStyle.backgroundColor = matchingLabel.color;
+      tokenValueStyle.color = matchingLabel.text_color;
+
+      if (matchingLabel.text_color === '#FFFFFF') {
+        const removeToken = tokenValueContainer.querySelector('.remove-token');
+        removeToken.classList.add('inverted');
+      }
+    })
+    .catch(() => new Flash('An error occurred while fetching label colors.'));
+  }
+
+  static renderVisualTokenValue(parentElement, tokenName, tokenValue) {
+    const tokenValueContainer = parentElement.querySelector('.value-container');
+    tokenValueContainer.querySelector('.value').innerText = tokenValue;
+
+    if (tokenName.toLowerCase() === 'label') {
+      FilteredSearchVisualTokens.updateLabelTokenColor(tokenValueContainer, tokenValue);
+    }
+  }
+
   static addVisualTokenElement(name, value, isSearchTerm) {
     const li = document.createElement('li');
     li.classList.add('js-visual-token');
@@ -55,7 +91,7 @@ class FilteredSearchVisualTokens {
 
     if (value) {
       li.innerHTML = FilteredSearchVisualTokens.createVisualTokenElementHTML();
-      li.querySelector('.value').innerText = value;
+      FilteredSearchVisualTokens.renderVisualTokenValue(li, name, value);
     } else {
       li.innerHTML = '<div class="name"></div>';
     }
@@ -74,7 +110,7 @@ class FilteredSearchVisualTokens {
       const name = FilteredSearchVisualTokens.getLastTokenPartial();
       lastVisualToken.innerHTML = FilteredSearchVisualTokens.createVisualTokenElementHTML();
       lastVisualToken.querySelector('.name').innerText = name;
-      lastVisualToken.querySelector('.value').innerText = value;
+      FilteredSearchVisualTokens.renderVisualTokenValue(lastVisualToken, name, value);
     }
   }
 
@@ -183,6 +219,9 @@ class FilteredSearchVisualTokens {
 
   static moveInputToTheRight() {
     const input = FilteredSearchContainer.container.querySelector('.filtered-search');
+
+    if (!input) return;
+
     const inputLi = input.parentElement;
     const tokenContainer = FilteredSearchContainer.container.querySelector('.tokens-container');
 
diff --git a/app/assets/javascripts/filtered_search/recent_searches_root.js b/app/assets/javascripts/filtered_search/recent_searches_root.js
index 4e38409e12a..b2e6f63aacf 100644
--- a/app/assets/javascripts/filtered_search/recent_searches_root.js
+++ b/app/assets/javascripts/filtered_search/recent_searches_root.js
@@ -29,12 +29,15 @@ class RecentSearchesRoot {
   }
 
   render() {
+    const state = this.store.state;
     this.vm = new Vue({
       el: this.wrapperElement,
-      data: this.store.state,
+      data() { return state; },
       template: `
         <recent-searches-dropdown-content
-          :items="recentSearches" />
+          :items="recentSearches"
+          :is-local-storage-available="isLocalStorageAvailable"
+          />
       `,
       components: {
         'recent-searches-dropdown-content': RecentSearchesDropdownContent,
diff --git a/app/assets/javascripts/filtered_search/services/recent_searches_service.js b/app/assets/javascripts/filtered_search/services/recent_searches_service.js
index 3e402d5aed0..a056dea928d 100644
--- a/app/assets/javascripts/filtered_search/services/recent_searches_service.js
+++ b/app/assets/javascripts/filtered_search/services/recent_searches_service.js
@@ -1,9 +1,17 @@
+import RecentSearchesServiceError from './recent_searches_service_error';
+import AccessorUtilities from '../../lib/utils/accessor';
+
 class RecentSearchesService {
   constructor(localStorageKey = 'issuable-recent-searches') {
     this.localStorageKey = localStorageKey;
   }
 
   fetch() {
+    if (!RecentSearchesService.isAvailable()) {
+      const error = new RecentSearchesServiceError();
+      return Promise.reject(error);
+    }
+
     const input = window.localStorage.getItem(this.localStorageKey);
 
     let searches = [];
@@ -19,8 +27,14 @@ class RecentSearchesService {
   }
 
   save(searches = []) {
+    if (!RecentSearchesService.isAvailable()) return;
+
     window.localStorage.setItem(this.localStorageKey, JSON.stringify(searches));
   }
+
+  static isAvailable() {
+    return AccessorUtilities.isLocalStorageAccessSafe();
+  }
 }
 
 export default RecentSearchesService;
diff --git a/app/assets/javascripts/filtered_search/services/recent_searches_service_error.js b/app/assets/javascripts/filtered_search/services/recent_searches_service_error.js
new file mode 100644
index 00000000000..5917b223d63
--- /dev/null
+++ b/app/assets/javascripts/filtered_search/services/recent_searches_service_error.js
@@ -0,0 +1,11 @@
+class RecentSearchesServiceError {
+  constructor(message) {
+    this.name = 'RecentSearchesServiceError';
+    this.message = message || 'Recent Searches Service is unavailable';
+  }
+}
+
+// Can't use `extends` for builtin prototypes and get true inheritance yet
+RecentSearchesServiceError.prototype = Error.prototype;
+
+export default RecentSearchesServiceError;
diff --git a/app/assets/javascripts/gl_dropdown.js b/app/assets/javascripts/gl_dropdown.js
index a03f1202a6d..0c9eb84f0eb 100644
--- a/app/assets/javascripts/gl_dropdown.js
+++ b/app/assets/javascripts/gl_dropdown.js
@@ -255,7 +255,8 @@ GitLabDropdown = (function() {
               }
             };
           // Remote data
-          })(this)
+          })(this),
+          instance: this,
         });
       }
     }
@@ -269,6 +270,7 @@ GitLabDropdown = (function() {
         remote: this.options.filterRemote,
         query: this.options.data,
         keys: searchFields,
+        instance: this,
         elements: (function(_this) {
           return function() {
             selector = '.dropdown-content li:not(' + NON_SELECTABLE_CLASSES + ')';
@@ -343,21 +345,26 @@ GitLabDropdown = (function() {
       }
       this.dropdown.on("click", selector, function(e) {
         var $el, selected, selectedObj, isMarking;
-        $el = $(this);
+        $el = $(e.currentTarget);
         selected = self.rowClicked($el);
         selectedObj = selected ? selected[0] : null;
         isMarking = selected ? selected[1] : null;
-        if (self.options.clicked) {
-          self.options.clicked(selectedObj, $el, e, isMarking);
+        if (this.options.clicked) {
+          this.options.clicked.call(this, {
+            selectedObj,
+            $el,
+            e,
+            isMarking,
+          });
         }
 
         // Update label right after all modifications in dropdown has been done
-        if (self.options.toggleLabel) {
-          self.updateLabel(selectedObj, $el, self);
+        if (this.options.toggleLabel) {
+          this.updateLabel(selectedObj, $el, this);
         }
 
         $el.trigger('blur');
-      });
+      }.bind(this));
     }
   }
 
@@ -439,15 +446,34 @@ GitLabDropdown = (function() {
     }
   };
 
+  GitLabDropdown.prototype.filteredFullData = function() {
+    return this.fullData.filter(r => typeof r === 'object'
+      && !Object.prototype.hasOwnProperty.call(r, 'beforeDivider')
+      && !Object.prototype.hasOwnProperty.call(r, 'header')
+    );
+  };
+
   GitLabDropdown.prototype.opened = function(e) {
     var contentHtml;
     this.resetRows();
     this.addArrowKeyEvent();
 
+    const dropdownToggle = this.dropdown.find('.dropdown-menu-toggle');
+    const hasFilterBulkUpdate = dropdownToggle.hasClass('js-filter-bulk-update');
+    const hasMultiSelect = dropdownToggle.hasClass('js-multiselect');
+
     // Makes indeterminate items effective
-    if (this.fullData && this.dropdown.find('.dropdown-menu-toggle').hasClass('js-filter-bulk-update')) {
+    if (this.fullData && hasFilterBulkUpdate) {
       this.parseData(this.fullData);
     }
+
+    // Process the data to make sure rendered data
+    // matches the correct layout
+    if (this.fullData && hasMultiSelect && this.options.processData) {
+      const inputValue = this.filterInput.val();
+      this.options.processData.call(this.options, inputValue, this.filteredFullData(), this.parseData.bind(this));
+    }
+
     contentHtml = $('.dropdown-content', this.dropdown).html();
     if (this.remote && contentHtml === "") {
       this.remote.execute();
@@ -709,6 +735,11 @@ GitLabDropdown = (function() {
     if (this.options.inputId != null) {
       $input.attr('id', this.options.inputId);
     }
+
+    if (this.options.inputMeta) {
+      $input.attr('data-meta', selectedObject[this.options.inputMeta]);
+    }
+
     return this.dropdown.before($input);
   };
 
@@ -829,7 +860,14 @@ GitLabDropdown = (function() {
     if (instance == null) {
       instance = null;
     }
-    return $(this.el).find(".dropdown-toggle-text").text(this.options.toggleLabel(selected, el, instance));
+
+    let toggleText = this.options.toggleLabel(selected, el, instance);
+    if (this.options.updateLabel) {
+      // Option to override the dropdown label text
+      toggleText = this.options.updateLabel;
+    }
+
+    return $(this.el).find(".dropdown-toggle-text").text(toggleText);
   };
 
   GitLabDropdown.prototype.clearField = function(field, isInput) {
diff --git a/app/assets/javascripts/issuable/issuable_bundle.js b/app/assets/javascripts/issuable/issuable_bundle.js
deleted file mode 100644
index e927cc0077c..00000000000
--- a/app/assets/javascripts/issuable/issuable_bundle.js
+++ /dev/null
@@ -1 +0,0 @@
-require('./time_tracking/time_tracking_bundle');
diff --git a/app/assets/javascripts/issuable/time_tracking/components/collapsed_state.js b/app/assets/javascripts/issuable/time_tracking/components/collapsed_state.js
deleted file mode 100644
index aec13e78f42..00000000000
--- a/app/assets/javascripts/issuable/time_tracking/components/collapsed_state.js
+++ /dev/null
@@ -1,42 +0,0 @@
-import Vue from 'vue';
-import stopwatchSvg from 'icons/_icon_stopwatch.svg';
-
-require('../../../lib/utils/pretty_time');
-
-(() => {
-  Vue.component('time-tracking-collapsed-state', {
-    name: 'time-tracking-collapsed-state',
-    props: [
-      'showComparisonState',
-      'showSpentOnlyState',
-      'showEstimateOnlyState',
-      'showNoTimeTrackingState',
-      'timeSpentHumanReadable',
-      'timeEstimateHumanReadable',
-    ],
-    methods: {
-      abbreviateTime(timeStr) {
-        return gl.utils.prettyTime.abbreviateTime(timeStr);
-      },
-    },
-    template: `
-      <div class='sidebar-collapsed-icon'>
-        ${stopwatchSvg}
-        <div class='time-tracking-collapsed-summary'>
-          <div class='compare' v-if='showComparisonState'>
-            <span>{{ abbreviateTime(timeSpentHumanReadable) }} / {{ abbreviateTime(timeEstimateHumanReadable) }}</span>
-          </div>
-          <div class='estimate-only' v-if='showEstimateOnlyState'>
-            <span class='bold'>-- / {{ abbreviateTime(timeEstimateHumanReadable) }}</span>
-          </div>
-          <div class='spend-only' v-if='showSpentOnlyState'>
-            <span class='bold'>{{ abbreviateTime(timeSpentHumanReadable) }} / --</span>
-          </div>
-          <div class='no-tracking' v-if='showNoTimeTrackingState'>
-            <span class='no-value'>None</span>
-          </div>
-        </div>
-      </div>
-      `,
-  });
-})();
diff --git a/app/assets/javascripts/issuable/time_tracking/components/comparison_pane.js b/app/assets/javascripts/issuable/time_tracking/components/comparison_pane.js
deleted file mode 100644
index c55e263f6f4..00000000000
--- a/app/assets/javascripts/issuable/time_tracking/components/comparison_pane.js
+++ /dev/null
@@ -1,70 +0,0 @@
-import Vue from 'vue';
-
-require('../../../lib/utils/pretty_time');
-
-(() => {
-  const prettyTime = gl.utils.prettyTime;
-
-  Vue.component('time-tracking-comparison-pane', {
-    name: 'time-tracking-comparison-pane',
-    props: [
-      'timeSpent',
-      'timeEstimate',
-      'timeSpentHumanReadable',
-      'timeEstimateHumanReadable',
-    ],
-    computed: {
-      parsedRemaining() {
-        const diffSeconds = this.timeEstimate - this.timeSpent;
-        return prettyTime.parseSeconds(diffSeconds);
-      },
-      timeRemainingHumanReadable() {
-        return prettyTime.stringifyTime(this.parsedRemaining);
-      },
-      timeRemainingTooltip() {
-        const prefix = this.timeRemainingMinutes < 0 ? 'Over by' : 'Time remaining:';
-        return `${prefix} ${this.timeRemainingHumanReadable}`;
-      },
-      /* Diff values for comparison meter */
-      timeRemainingMinutes() {
-        return this.timeEstimate - this.timeSpent;
-      },
-      timeRemainingPercent() {
-        return `${Math.floor((this.timeSpent / this.timeEstimate) * 100)}%`;
-      },
-      timeRemainingStatusClass() {
-        return this.timeEstimate >= this.timeSpent ? 'within_estimate' : 'over_estimate';
-      },
-      /* Parsed time values */
-      parsedEstimate() {
-        return prettyTime.parseSeconds(this.timeEstimate);
-      },
-      parsedSpent() {
-        return prettyTime.parseSeconds(this.timeSpent);
-      },
-    },
-    template: `
-      <div class='time-tracking-comparison-pane'>
-        <div class='compare-meter' data-toggle='tooltip' data-placement='top' role='timeRemainingDisplay'
-          :aria-valuenow='timeRemainingTooltip'
-          :title='timeRemainingTooltip'
-          :data-original-title='timeRemainingTooltip'
-          :class='timeRemainingStatusClass'>
-          <div class='meter-container' role='timeSpentPercent' :aria-valuenow='timeRemainingPercent'>
-            <div :style='{ width: timeRemainingPercent }' class='meter-fill'></div>
-          </div>
-          <div class='compare-display-container'>
-            <div class='compare-display pull-left'>
-              <span class='compare-label'>Spent</span>
-              <span class='compare-value spent'>{{ timeSpentHumanReadable }}</span>
-            </div>
-            <div class='compare-display estimated pull-right'>
-              <span class='compare-label'>Est</span>
-              <span class='compare-value'>{{ timeEstimateHumanReadable }}</span>
-            </div>
-          </div>
-        </div>
-      </div>
-    `,
-  });
-})();
diff --git a/app/assets/javascripts/issuable/time_tracking/components/estimate_only_pane.js b/app/assets/javascripts/issuable/time_tracking/components/estimate_only_pane.js
deleted file mode 100644
index a7fbd704c40..00000000000
--- a/app/assets/javascripts/issuable/time_tracking/components/estimate_only_pane.js
+++ /dev/null
@@ -1,14 +0,0 @@
-import Vue from 'vue';
-
-(() => {
-  Vue.component('time-tracking-estimate-only-pane', {
-    name: 'time-tracking-estimate-only-pane',
-    props: ['timeEstimateHumanReadable'],
-    template: `
-      <div class='time-tracking-estimate-only-pane'>
-        <span class='bold'>Estimated:</span>
-        {{ timeEstimateHumanReadable }}
-      </div>
-    `,
-  });
-})();
diff --git a/app/assets/javascripts/issuable/time_tracking/components/help_state.js b/app/assets/javascripts/issuable/time_tracking/components/help_state.js
deleted file mode 100644
index 344b29ebea4..00000000000
--- a/app/assets/javascripts/issuable/time_tracking/components/help_state.js
+++ /dev/null
@@ -1,25 +0,0 @@
-import Vue from 'vue';
-
-(() => {
-  Vue.component('time-tracking-help-state', {
-    name: 'time-tracking-help-state',
-    props: ['docsUrl'],
-    template: `
-      <div class='time-tracking-help-state'>
-        <div class='time-tracking-info'>
-          <h4>Track time with slash commands</h4>
-          <p>Slash commands can be used in the issues description and comment boxes.</p>
-          <p>
-            <code>/estimate</code>
-            will update the estimated time with the latest command.
-          </p>
-          <p>
-            <code>/spend</code>
-            will update the sum of the time spent.
-          </p>
-          <a class='btn btn-default learn-more-button' :href='docsUrl'>Learn more</a>
-        </div>
-      </div>
-    `,
-  });
-})();
diff --git a/app/assets/javascripts/issuable/time_tracking/components/no_tracking_pane.js b/app/assets/javascripts/issuable/time_tracking/components/no_tracking_pane.js
deleted file mode 100644
index b081adf5e64..00000000000
--- a/app/assets/javascripts/issuable/time_tracking/components/no_tracking_pane.js
+++ /dev/null
@@ -1,12 +0,0 @@
-import Vue from 'vue';
-
-(() => {
-  Vue.component('time-tracking-no-tracking-pane', {
-    name: 'time-tracking-no-tracking-pane',
-    template: `
-      <div class='time-tracking-no-tracking-pane'>
-        <span class='no-value'>No estimate or time spent</span>
-      </div>
-    `,
-  });
-})();
diff --git a/app/assets/javascripts/issuable/time_tracking/components/spent_only_pane.js b/app/assets/javascripts/issuable/time_tracking/components/spent_only_pane.js
deleted file mode 100644
index edb9169112f..00000000000
--- a/app/assets/javascripts/issuable/time_tracking/components/spent_only_pane.js
+++ /dev/null
@@ -1,14 +0,0 @@
-import Vue from 'vue';
-
-(() => {
-  Vue.component('time-tracking-spent-only-pane', {
-    name: 'time-tracking-spent-only-pane',
-    props: ['timeSpentHumanReadable'],
-    template: `
-      <div class='time-tracking-spend-only-pane'>
-        <span class='bold'>Spent:</span>
-        {{ timeSpentHumanReadable }}
-      </div>
-    `,
-  });
-})();
diff --git a/app/assets/javascripts/issuable/time_tracking/components/time_tracker.js b/app/assets/javascripts/issuable/time_tracking/components/time_tracker.js
deleted file mode 100644
index 0213522f551..00000000000
--- a/app/assets/javascripts/issuable/time_tracking/components/time_tracker.js
+++ /dev/null
@@ -1,117 +0,0 @@
-import Vue from 'vue';
-
-require('./help_state');
-require('./collapsed_state');
-require('./spent_only_pane');
-require('./no_tracking_pane');
-require('./estimate_only_pane');
-require('./comparison_pane');
-
-(() => {
-  Vue.component('issuable-time-tracker', {
-    name: 'issuable-time-tracker',
-    props: [
-      'time_estimate',
-      'time_spent',
-      'human_time_estimate',
-      'human_time_spent',
-      'docsUrl',
-    ],
-    data() {
-      return {
-        showHelp: false,
-      };
-    },
-    computed: {
-      timeSpent() {
-        return this.time_spent;
-      },
-      timeEstimate() {
-        return this.time_estimate;
-      },
-      timeEstimateHumanReadable() {
-        return this.human_time_estimate;
-      },
-      timeSpentHumanReadable() {
-        return this.human_time_spent;
-      },
-      hasTimeSpent() {
-        return !!this.timeSpent;
-      },
-      hasTimeEstimate() {
-        return !!this.timeEstimate;
-      },
-      showComparisonState() {
-        return this.hasTimeEstimate && this.hasTimeSpent;
-      },
-      showEstimateOnlyState() {
-        return this.hasTimeEstimate && !this.hasTimeSpent;
-      },
-      showSpentOnlyState() {
-        return this.hasTimeSpent && !this.hasTimeEstimate;
-      },
-      showNoTimeTrackingState() {
-        return !this.hasTimeEstimate && !this.hasTimeSpent;
-      },
-      showHelpState() {
-        return !!this.showHelp;
-      },
-    },
-    methods: {
-      toggleHelpState(show) {
-        this.showHelp = show;
-      },
-    },
-    template: `
-      <div class='time_tracker time-tracking-component-wrap' v-cloak>
-        <time-tracking-collapsed-state
-          :show-comparison-state='showComparisonState'
-          :show-help-state='showHelpState'
-          :show-spent-only-state='showSpentOnlyState'
-          :show-estimate-only-state='showEstimateOnlyState'
-          :time-spent-human-readable='timeSpentHumanReadable'
-          :time-estimate-human-readable='timeEstimateHumanReadable'>
-        </time-tracking-collapsed-state>
-        <div class='title hide-collapsed'>
-          Time tracking
-          <div class='help-button pull-right'
-            v-if='!showHelpState'
-            @click='toggleHelpState(true)'>
-            <i class='fa fa-question-circle' aria-hidden='true'></i>
-          </div>
-          <div class='close-help-button pull-right'
-            v-if='showHelpState'
-            @click='toggleHelpState(false)'>
-            <i class='fa fa-close' aria-hidden='true'></i>
-          </div>
-        </div>
-        <div class='time-tracking-content hide-collapsed'>
-          <time-tracking-estimate-only-pane
-            v-if='showEstimateOnlyState'
-            :time-estimate-human-readable='timeEstimateHumanReadable'>
-          </time-tracking-estimate-only-pane>
-          <time-tracking-spent-only-pane
-            v-if='showSpentOnlyState'
-            :time-spent-human-readable='timeSpentHumanReadable'>
-          </time-tracking-spent-only-pane>
-          <time-tracking-no-tracking-pane
-            v-if='showNoTimeTrackingState'>
-          </time-tracking-no-tracking-pane>
-          <time-tracking-comparison-pane
-            v-if='showComparisonState'
-            :time-estimate='timeEstimate'
-            :time-spent='timeSpent'
-            :time-spent-human-readable='timeSpentHumanReadable'
-            :time-estimate-human-readable='timeEstimateHumanReadable'>
-          </time-tracking-comparison-pane>
-          <transition name='help-state-toggle'>
-            <time-tracking-help-state
-              v-if='showHelpState'
-              :docs-url='docsUrl'>
-            </time-tracking-help-state>
-          </transition>
-        </div>
-      </div>
-    `,
-  });
-})();
diff --git a/app/assets/javascripts/issuable/time_tracking/time_tracking_bundle.js b/app/assets/javascripts/issuable/time_tracking/time_tracking_bundle.js
deleted file mode 100644
index 1689a69e1ed..00000000000
--- a/app/assets/javascripts/issuable/time_tracking/time_tracking_bundle.js
+++ /dev/null
@@ -1,66 +0,0 @@
-import Vue from 'vue';
-import VueResource from 'vue-resource';
-
-require('./components/time_tracker');
-require('../../smart_interval');
-require('../../subbable_resource');
-
-Vue.use(VueResource);
-
-(() => {
-  /* This Vue instance represents what will become the parent instance for the
-    * sidebar. It will be responsible for managing `issuable` state and propagating
-    * changes to sidebar components. We will want to create a separate service to
-    * interface with the server at that point.
-   */
-
-  class IssuableTimeTracking {
-    constructor(issuableJSON) {
-      const parsedIssuable = JSON.parse(issuableJSON);
-      return this.initComponent(parsedIssuable);
-    }
-
-    initComponent(parsedIssuable) {
-      this.parentInstance = new Vue({
-        el: '#issuable-time-tracker',
-        data: {
-          issuable: parsedIssuable,
-        },
-        methods: {
-          fetchIssuable() {
-            return gl.IssuableResource.get.call(gl.IssuableResource, {
-              type: 'GET',
-              url: gl.IssuableResource.endpoint,
-            });
-          },
-          updateState(data) {
-            this.issuable = data;
-          },
-          subscribeToUpdates() {
-            gl.IssuableResource.subscribe(data => this.updateState(data));
-          },
-          listenForSlashCommands() {
-            $(document).on('ajax:success', '.gfm-form', (e, data) => {
-              const subscribedCommands = ['spend_time', 'time_estimate'];
-              const changedCommands = data.commands_changes
-                ? Object.keys(data.commands_changes)
-                : [];
-              if (changedCommands && _.intersection(subscribedCommands, changedCommands).length) {
-                this.fetchIssuable();
-              }
-            });
-          },
-        },
-        created() {
-          this.fetchIssuable();
-        },
-        mounted() {
-          this.subscribeToUpdates();
-          this.listenForSlashCommands();
-        },
-      });
-    }
-  }
-
-  gl.IssuableTimeTracking = IssuableTimeTracking;
-})(window.gl || (window.gl = {}));
diff --git a/app/assets/javascripts/issue_show/actions/tasks.js b/app/assets/javascripts/issue_show/actions/tasks.js
new file mode 100644
index 00000000000..0740a9f559c
--- /dev/null
+++ b/app/assets/javascripts/issue_show/actions/tasks.js
@@ -0,0 +1,27 @@
+export default (newStateData, tasks) => {
+  const $tasks = $('#task_status');
+  const $tasksShort = $('#task_status_short');
+  const $issueableHeader = $('.issuable-header');
+  const tasksStates = { newState: null, currentState: null };
+
+  if ($tasks.length === 0) {
+    if (!(newStateData.task_status.indexOf('0 of 0') === 0)) {
+      $issueableHeader.append(`<span id="task_status">${newStateData.task_status}</span>`);
+    } else {
+      $issueableHeader.append('<span id="task_status"></span>');
+    }
+  } else {
+    tasksStates.newState = newStateData.task_status.indexOf('0 of 0') === 0;
+    tasksStates.currentState = tasks.indexOf('0 of 0') === 0;
+  }
+
+  if ($tasks.length !== 0 && !tasksStates.newState) {
+    $tasks.text(newStateData.task_status);
+    $tasksShort.text(newStateData.task_status);
+  } else if (tasksStates.currentState) {
+    $issueableHeader.append(`<span id="task_status">${newStateData.task_status}</span>`);
+  } else if (tasksStates.newState) {
+    $tasks.remove();
+    $tasksShort.remove();
+  }
+};
diff --git a/app/assets/javascripts/issue_show/index.js b/app/assets/javascripts/issue_show/index.js
index 4d491e70d83..eb20a597bb5 100644
--- a/app/assets/javascripts/issue_show/index.js
+++ b/app/assets/javascripts/issue_show/index.js
@@ -1,16 +1,16 @@
 import Vue from 'vue';
-import IssueTitle from './issue_title.vue';
+import IssueTitle from './issue_title_description.vue';
 import '../vue_shared/vue_resource_interceptor';
 
 (() => {
   const issueTitleData = document.querySelector('.issue-title-data').dataset;
-  const { initialTitle, endpoint } = issueTitleData;
+  const { canUpdateTasksClass, endpoint } = issueTitleData;
 
   const vm = new Vue({
     el: '.issue-title-entrypoint',
     render: createElement => createElement(IssueTitle, {
       props: {
-        initialTitle,
+        canUpdateTasksClass,
         endpoint,
       },
     }),
diff --git a/app/assets/javascripts/issue_show/issue_title.vue b/app/assets/javascripts/issue_show/issue_title.vue
deleted file mode 100644
index 00b0e56030a..00000000000
--- a/app/assets/javascripts/issue_show/issue_title.vue
+++ /dev/null
@@ -1,80 +0,0 @@
-<script>
-import Visibility from 'visibilityjs';
-import Poll from './../lib/utils/poll';
-import Service from './services/index';
-
-export default {
-  props: {
-    initialTitle: { required: true, type: String },
-    endpoint: { required: true, type: String },
-  },
-  data() {
-    const resource = new Service(this.$http, this.endpoint);
-
-    const poll = new Poll({
-      resource,
-      method: 'getTitle',
-      successCallback: (res) => {
-        this.renderResponse(res);
-      },
-      errorCallback: (err) => {
-        if (process.env.NODE_ENV !== 'production') {
-          // eslint-disable-next-line no-console
-          console.error('ISSUE SHOW TITLE REALTIME ERROR', err);
-        } else {
-          throw new Error(err);
-        }
-      },
-    });
-
-    return {
-      poll,
-      timeoutId: null,
-      title: this.initialTitle,
-    };
-  },
-  methods: {
-    renderResponse(res) {
-      const body = JSON.parse(res.body);
-      this.triggerAnimation(body);
-    },
-    triggerAnimation(body) {
-      const { title } = body;
-
-      /**
-      * since opacity is changed, even if there is no diff for Vue to update
-      * we must check the title even on a 304 to ensure no visual change
-      */
-      if (this.title === title) return;
-
-      this.$el.style.opacity = 0;
-
-      this.timeoutId = setTimeout(() => {
-        this.title = title;
-
-        this.$el.style.transition = 'opacity 0.2s ease';
-        this.$el.style.opacity = 1;
-
-        clearTimeout(this.timeoutId);
-      }, 100);
-    },
-  },
-  created() {
-    if (!Visibility.hidden()) {
-      this.poll.makeRequest();
-    }
-
-    Visibility.change(() => {
-      if (!Visibility.hidden()) {
-        this.poll.restart();
-      } else {
-        this.poll.stop();
-      }
-    });
-  },
-};
-</script>
-
-<template>
-  <h2 class="title" v-html="title"></h2>
-</template>
diff --git a/app/assets/javascripts/issue_show/issue_title_description.vue b/app/assets/javascripts/issue_show/issue_title_description.vue
new file mode 100644
index 00000000000..dc3ba2550c5
--- /dev/null
+++ b/app/assets/javascripts/issue_show/issue_title_description.vue
@@ -0,0 +1,180 @@
+<script>
+import Visibility from 'visibilityjs';
+import Poll from './../lib/utils/poll';
+import Service from './services/index';
+import tasks from './actions/tasks';
+
+export default {
+  props: {
+    endpoint: {
+      required: true,
+      type: String,
+    },
+    canUpdateTasksClass: {
+      required: true,
+      type: String,
+    },
+  },
+  data() {
+    const resource = new Service(this.$http, this.endpoint);
+
+    const poll = new Poll({
+      resource,
+      method: 'getTitle',
+      successCallback: (res) => {
+        this.renderResponse(res);
+      },
+      errorCallback: (err) => {
+        throw new Error(err);
+      },
+    });
+
+    return {
+      poll,
+      apiData: {},
+      tasks: '0 of 0',
+      title: null,
+      titleText: '',
+      titleFlag: {
+        pre: true,
+        pulse: false,
+      },
+      description: null,
+      descriptionText: '',
+      descriptionChange: false,
+      descriptionFlag: {
+        pre: true,
+        pulse: false,
+      },
+      timeAgoEl: $('.issue_edited_ago'),
+      titleEl: document.querySelector('title'),
+    };
+  },
+  methods: {
+    updateFlag(key, toggle) {
+      this[key].pre = toggle;
+      this[key].pulse = !toggle;
+    },
+    renderResponse(res) {
+      this.apiData = res.json();
+      this.triggerAnimation();
+    },
+    updateTaskHTML() {
+      tasks(this.apiData, this.tasks);
+    },
+    elementsToVisualize(noTitleChange, noDescriptionChange) {
+      if (!noTitleChange) {
+        this.titleText = this.apiData.title_text;
+        this.updateFlag('titleFlag', true);
+      }
+
+      if (!noDescriptionChange) {
+        // only change to true when we need to bind TaskLists the html of description
+        this.descriptionChange = true;
+        this.updateTaskHTML();
+        this.tasks = this.apiData.task_status;
+        this.updateFlag('descriptionFlag', true);
+      }
+    },
+    setTabTitle() {
+      const currentTabTitleScope = this.titleEl.innerText.split('·');
+      currentTabTitleScope[0] = `${this.titleText} (#${this.apiData.issue_number}) `;
+      this.titleEl.innerText = currentTabTitleScope.join('·');
+    },
+    animate(title, description) {
+      this.title = title;
+      this.description = description;
+      this.setTabTitle();
+
+      this.$nextTick(() => {
+        this.updateFlag('titleFlag', false);
+        this.updateFlag('descriptionFlag', false);
+      });
+    },
+    triggerAnimation() {
+      // always reset to false before checking the change
+      this.descriptionChange = false;
+
+      const { title, description } = this.apiData;
+      this.descriptionText = this.apiData.description_text;
+
+      const noTitleChange = this.title === title;
+      const noDescriptionChange = this.description === description;
+
+      /**
+      * since opacity is changed, even if there is no diff for Vue to update
+      * we must check the title/description even on a 304 to ensure no visual change
+      */
+      if (noTitleChange && noDescriptionChange) return;
+
+      this.elementsToVisualize(noTitleChange, noDescriptionChange);
+      this.animate(title, description);
+    },
+    updateEditedTimeAgo() {
+      const toolTipTime = gl.utils.formatDate(this.apiData.updated_at);
+      this.timeAgoEl.attr('datetime', this.apiData.updated_at);
+      this.timeAgoEl.attr('title', toolTipTime).tooltip('fixTitle');
+    },
+  },
+  created() {
+    if (!Visibility.hidden()) {
+      this.poll.makeRequest();
+    }
+
+    Visibility.change(() => {
+      if (!Visibility.hidden()) {
+        this.poll.restart();
+      } else {
+        this.poll.stop();
+      }
+    });
+  },
+  updated() {
+    // if new html is injected (description changed) - bind TaskList and call renderGFM
+    if (this.descriptionChange) {
+      this.updateEditedTimeAgo();
+
+      $(this.$refs['issue-content-container-gfm-entry']).renderGFM();
+
+      const tl = new gl.TaskList({
+        dataType: 'issue',
+        fieldName: 'description',
+        selector: '.detail-page-description',
+      });
+
+      return tl && null;
+    }
+
+    return null;
+  },
+};
+</script>
+
+<template>
+  <div>
+    <h2
+      class="title"
+      :class="{ 'issue-realtime-pre-pulse': titleFlag.pre, 'issue-realtime-trigger-pulse': titleFlag.pulse }"
+      ref="issue-title"
+      v-html="title"
+    >
+    </h2>
+    <div
+      class="description is-task-list-enabled"
+      :class="canUpdateTasksClass"
+      v-if="description"
+    >
+      <div
+        class="wiki"
+        :class="{ 'issue-realtime-pre-pulse': descriptionFlag.pre, 'issue-realtime-trigger-pulse': descriptionFlag.pulse }"
+        v-html="description"
+        ref="issue-content-container-gfm-entry"
+      >
+      </div>
+      <textarea
+        class="hidden js-task-list-field"
+        v-if="descriptionText"
+      >{{descriptionText}}</textarea>
+    </div>
+  </div>
+</template>
diff --git a/app/assets/javascripts/issue_status_select.js b/app/assets/javascripts/issue_status_select.js
index b2cfd3ef2a3..56cb536dcde 100644
--- a/app/assets/javascripts/issue_status_select.js
+++ b/app/assets/javascripts/issue_status_select.js
@@ -19,8 +19,8 @@
               return label;
             };
           })(this),
-          clicked: function(item, $el, e) {
-            return e.preventDefault();
+          clicked: function(options) {
+            return options.e.preventDefault();
           },
           id: function(obj, el) {
             return $(el).data("id");
diff --git a/app/assets/javascripts/issues_bulk_assignment.js b/app/assets/javascripts/issues_bulk_assignment.js
index e0ebd36a65c..fee3429e2b8 100644
--- a/app/assets/javascripts/issues_bulk_assignment.js
+++ b/app/assets/javascripts/issues_bulk_assignment.js
@@ -88,7 +88,10 @@
       const formData = {
         update: {
           state_event: this.form.find('input[name="update[state_event]"]').val(),
+          // For Merge Requests
           assignee_id: this.form.find('input[name="update[assignee_id]"]').val(),
+          // For Issues
+          assignee_ids: [this.form.find('input[name="update[assignee_ids][]"]').val()],
           milestone_id: this.form.find('input[name="update[milestone_id]"]').val(),
           issuable_ids: this.form.find('input[name="update[issuable_ids]"]').val(),
           subscription_event: this.form.find('input[name="update[subscription_event]"]').val(),
diff --git a/app/assets/javascripts/labels_select.js b/app/assets/javascripts/labels_select.js
index 9a60f5464df..ac5ce84e31b 100644
--- a/app/assets/javascripts/labels_select.js
+++ b/app/assets/javascripts/labels_select.js
@@ -330,7 +330,10 @@
           },
           multiSelect: $dropdown.hasClass('js-multiselect'),
           vue: $dropdown.hasClass('js-issue-board-sidebar'),
-          clicked: function(label, $el, e, isMarking) {
+          clicked: function(options) {
+            const { $el, e, isMarking } = options;
+            const label = options.selectedObj;
+
             var isIssueIndex, isMRIndex, page, boardsModel;
             var fadeOutLoader = () => {
               $loading.fadeOut();
@@ -352,7 +355,7 @@
 
             if ($dropdown.hasClass('js-filter-bulk-update')) {
               _this.enableBulkLabelDropdown();
-              _this.setDropdownData($dropdown, isMarking, this.id(label));
+              _this.setDropdownData($dropdown, isMarking, label.id);
               return;
             }
 
diff --git a/app/assets/javascripts/lib/utils/accessor.js b/app/assets/javascripts/lib/utils/accessor.js
new file mode 100644
index 00000000000..1d18992af63
--- /dev/null
+++ b/app/assets/javascripts/lib/utils/accessor.js
@@ -0,0 +1,47 @@
+function isPropertyAccessSafe(base, property) {
+  let safe;
+
+  try {
+    safe = !!base[property];
+  } catch (error) {
+    safe = false;
+  }
+
+  return safe;
+}
+
+function isFunctionCallSafe(base, functionName, ...args) {
+  let safe = true;
+
+  try {
+    base[functionName](...args);
+  } catch (error) {
+    safe = false;
+  }
+
+  return safe;
+}
+
+function isLocalStorageAccessSafe() {
+  let safe;
+
+  const TEST_KEY = 'isLocalStorageAccessSafe';
+  const TEST_VALUE = 'true';
+
+  safe = isPropertyAccessSafe(window, 'localStorage');
+  if (!safe) return safe;
+
+  safe = isFunctionCallSafe(window.localStorage, 'setItem', TEST_KEY, TEST_VALUE);
+
+  if (safe) window.localStorage.removeItem(TEST_KEY);
+
+  return safe;
+}
+
+const AccessorUtilities = {
+  isPropertyAccessSafe,
+  isFunctionCallSafe,
+  isLocalStorageAccessSafe,
+};
+
+export default AccessorUtilities;
diff --git a/app/assets/javascripts/lib/utils/ajax_cache.js b/app/assets/javascripts/lib/utils/ajax_cache.js
new file mode 100644
index 00000000000..d99eefb5089
--- /dev/null
+++ b/app/assets/javascripts/lib/utils/ajax_cache.js
@@ -0,0 +1,32 @@
+const AjaxCache = {
+  internalStorage: { },
+  get(endpoint) {
+    return this.internalStorage[endpoint];
+  },
+  hasData(endpoint) {
+    return Object.prototype.hasOwnProperty.call(this.internalStorage, endpoint);
+  },
+  purge(endpoint) {
+    delete this.internalStorage[endpoint];
+  },
+  retrieve(endpoint) {
+    if (AjaxCache.hasData(endpoint)) {
+      return Promise.resolve(AjaxCache.get(endpoint));
+    }
+
+    return new Promise((resolve, reject) => {
+      $.ajax(endpoint) // eslint-disable-line promise/catch-or-return
+      .then(data => resolve(data),
+        (jqXHR, textStatus, errorThrown) => {
+          const error = new Error(`${endpoint}: ${errorThrown}`);
+          error.textStatus = textStatus;
+          reject(error);
+        },
+      );
+    })
+    .then((data) => { this.internalStorage[endpoint] = data; })
+    .then(() => AjaxCache.get(endpoint));
+  },
+};
+
+export default AjaxCache;
diff --git a/app/assets/javascripts/main.js b/app/assets/javascripts/main.js
index be3c2c9fbb1..1b0d5fc92e3 100644
--- a/app/assets/javascripts/main.js
+++ b/app/assets/javascripts/main.js
@@ -158,7 +158,6 @@ import './single_file_diff';
 import './smart_interval';
 import './snippets_list';
 import './star';
-import './subbable_resource';
 import './subscription';
 import './subscription_select';
 import './syntax_highlight';
diff --git a/app/assets/javascripts/members.js b/app/assets/javascripts/members.js
index e3f367a11eb..8291b8c4a70 100644
--- a/app/assets/javascripts/members.js
+++ b/app/assets/javascripts/members.js
@@ -31,8 +31,8 @@
           toggleLabel(selected, $el) {
             return $el.text();
           },
-          clicked: (selected, $link) => {
-            this.formSubmit(null, $link);
+          clicked: (options) => {
+            this.formSubmit(null, options.$el);
           },
         });
       });
diff --git a/app/assets/javascripts/milestone_select.js b/app/assets/javascripts/milestone_select.js
index bebd0aa357e..11e68c0a3be 100644
--- a/app/assets/javascripts/milestone_select.js
+++ b/app/assets/javascripts/milestone_select.js
@@ -121,7 +121,10 @@
             return $value.css('display', '');
           },
           vue: $dropdown.hasClass('js-issue-board-sidebar'),
-          clicked: function(selected, $el, e) {
+          clicked: function(options) {
+            const { $el, e } = options;
+            let selected = options.selectedObj;
+
             var data, isIssueIndex, isMRIndex, page, boardsStore;
             page = $('body').data('page');
             isIssueIndex = page === 'projects:issues:index';
diff --git a/app/assets/javascripts/namespace_select.js b/app/assets/javascripts/namespace_select.js
index b98e6121967..36bc1257cef 100644
--- a/app/assets/javascripts/namespace_select.js
+++ b/app/assets/javascripts/namespace_select.js
@@ -58,7 +58,8 @@
       });
     }
 
-    NamespaceSelect.prototype.onSelectItem = function(item, el, e) {
+    NamespaceSelect.prototype.onSelectItem = function(options) {
+      const { e } = options;
       return e.preventDefault();
     };
 
diff --git a/app/assets/javascripts/notes.js b/app/assets/javascripts/notes.js
index 72709f68070..55391ebc089 100644
--- a/app/assets/javascripts/notes.js
+++ b/app/assets/javascripts/notes.js
@@ -1356,7 +1356,7 @@ const normalizeNewlines = function(str) {
 
       // Show updated comment content temporarily
       $noteBodyText.html(formContent);
-      $editingNote.removeClass('is-editing').addClass('being-posted fade-in-half');
+      $editingNote.removeClass('is-editing fade-in-full').addClass('being-posted fade-in-half');
       $editingNote.find('.note-headline-meta a').html('<i class="fa fa-spinner fa-spin" aria-label="Comment is being updated" aria-hidden="true"></i>');
 
       /* eslint-disable promise/catch-or-return */
diff --git a/app/assets/javascripts/project.js b/app/assets/javascripts/project.js
index f944fcc5a58..738e710deb9 100644
--- a/app/assets/javascripts/project.js
+++ b/app/assets/javascripts/project.js
@@ -112,7 +112,8 @@ import Cookies from 'js-cookie';
           toggleLabel: function(obj, $el) {
             return $el.text().trim();
           },
-          clicked: function(selected, $el, e) {
+          clicked: function(options) {
+            const { e } = options;
             e.preventDefault();
             if ($('input[name="ref"]').length) {
               var $form = $dropdown.closest('form');
diff --git a/app/assets/javascripts/protected_branches/protected_branch_access_dropdown.js b/app/assets/javascripts/protected_branches/protected_branch_access_dropdown.js
index e7fff57ff45..42993a252c3 100644
--- a/app/assets/javascripts/protected_branches/protected_branch_access_dropdown.js
+++ b/app/assets/javascripts/protected_branches/protected_branch_access_dropdown.js
@@ -19,7 +19,9 @@
             return 'Select';
           }
         },
-        clicked(item, $el, e) {
+        clicked(opts) {
+          const { e } = opts;
+
           e.preventDefault();
           onSelect();
         }
diff --git a/app/assets/javascripts/protected_branches/protected_branch_dropdown.js b/app/assets/javascripts/protected_branches/protected_branch_dropdown.js
index 1d4bb8a13d6..bc6110fcd4e 100644
--- a/app/assets/javascripts/protected_branches/protected_branch_dropdown.js
+++ b/app/assets/javascripts/protected_branches/protected_branch_dropdown.js
@@ -35,7 +35,8 @@ class ProtectedBranchDropdown {
         return _.escape(protectedBranch.id);
       },
       onFilter: this.toggleCreateNewButton.bind(this),
-      clicked: (item, $el, e) => {
+      clicked: (options) => {
+        const { $el, e } = options;
         e.preventDefault();
         this.onSelect();
       }
diff --git a/app/assets/javascripts/protected_tags/protected_tag_access_dropdown.js b/app/assets/javascripts/protected_tags/protected_tag_access_dropdown.js
index fff83f3af3b..d4c9a91a74a 100644
--- a/app/assets/javascripts/protected_tags/protected_tag_access_dropdown.js
+++ b/app/assets/javascripts/protected_tags/protected_tag_access_dropdown.js
@@ -17,8 +17,8 @@ export default class ProtectedTagAccessDropdown {
         }
         return 'Select';
       },
-      clicked(item, $el, e) {
-        e.preventDefault();
+      clicked(options) {
+        options.e.preventDefault();
         onSelect();
       },
     });
diff --git a/app/assets/javascripts/protected_tags/protected_tag_dropdown.js b/app/assets/javascripts/protected_tags/protected_tag_dropdown.js
index 5ff4e443262..068e9698e1d 100644
--- a/app/assets/javascripts/protected_tags/protected_tag_dropdown.js
+++ b/app/assets/javascripts/protected_tags/protected_tag_dropdown.js
@@ -39,8 +39,8 @@ export default class ProtectedTagDropdown {
         return _.escape(protectedTag.id);
       },
       onFilter: this.toggleCreateNewButton.bind(this),
-      clicked: (item, $el, e) => {
-        e.preventDefault();
+      clicked: (options) => {
+        options.e.preventDefault();
         this.onSelect();
       },
     });
diff --git a/app/assets/javascripts/raven/index.js b/app/assets/javascripts/raven/index.js
new file mode 100644
index 00000000000..5325e495815
--- /dev/null
+++ b/app/assets/javascripts/raven/index.js
@@ -0,0 +1,16 @@
+import RavenConfig from './raven_config';
+
+const index = function index() {
+  RavenConfig.init({
+    sentryDsn: gon.sentry_dsn,
+    currentUserId: gon.current_user_id,
+    whitelistUrls: [gon.gitlab_url],
+    isProduction: process.env.NODE_ENV,
+  });
+
+  return RavenConfig;
+};
+
+index();
+
+export default index;
diff --git a/app/assets/javascripts/raven/raven_config.js b/app/assets/javascripts/raven/raven_config.js
new file mode 100644
index 00000000000..c7fe1cacf49
--- /dev/null
+++ b/app/assets/javascripts/raven/raven_config.js
@@ -0,0 +1,100 @@
+import Raven from 'raven-js';
+
+const IGNORE_ERRORS = [
+  // Random plugins/extensions
+  'top.GLOBALS',
+  // See: http://blog.errorception.com/2012/03/tale-of-unfindable-js-error. html
+  'originalCreateNotification',
+  'canvas.contentDocument',
+  'MyApp_RemoveAllHighlights',
+  'http://tt.epicplay.com',
+  'Can\'t find variable: ZiteReader',
+  'jigsaw is not defined',
+  'ComboSearch is not defined',
+  'http://loading.retry.widdit.com/',
+  'atomicFindClose',
+  // Facebook borked
+  'fb_xd_fragment',
+  // ISP "optimizing" proxy - `Cache-Control: no-transform` seems to
+  // reduce this. (thanks @acdha)
+  // See http://stackoverflow.com/questions/4113268
+  'bmi_SafeAddOnload',
+  'EBCallBackMessageReceived',
+  // See http://toolbar.conduit.com/Developer/HtmlAndGadget/Methods/JSInjection.aspx
+  'conduitPage',
+];
+
+const IGNORE_URLS = [
+  // Facebook flakiness
+  /graph\.facebook\.com/i,
+  // Facebook blocked
+  /connect\.facebook\.net\/en_US\/all\.js/i,
+  // Woopra flakiness
+  /eatdifferent\.com\.woopra-ns\.com/i,
+  /static\.woopra\.com\/js\/woopra\.js/i,
+  // Chrome extensions
+  /extensions\//i,
+  /^chrome:\/\//i,
+  // Other plugins
+  /127\.0\.0\.1:4001\/isrunning/i,  // Cacaoweb
+  /webappstoolbarba\.texthelp\.com\//i,
+  /metrics\.itunes\.apple\.com\.edgesuite\.net\//i,
+];
+
+const SAMPLE_RATE = 95;
+
+const RavenConfig = {
+  IGNORE_ERRORS,
+  IGNORE_URLS,
+  SAMPLE_RATE,
+  init(options = {}) {
+    this.options = options;
+
+    this.configure();
+    this.bindRavenErrors();
+    if (this.options.currentUserId) this.setUser();
+  },
+
+  configure() {
+    Raven.config(this.options.sentryDsn, {
+      whitelistUrls: this.options.whitelistUrls,
+      environment: this.options.isProduction ? 'production' : 'development',
+      ignoreErrors: this.IGNORE_ERRORS,
+      ignoreUrls: this.IGNORE_URLS,
+      shouldSendCallback: this.shouldSendSample.bind(this),
+    }).install();
+  },
+
+  setUser() {
+    Raven.setUserContext({
+      id: this.options.currentUserId,
+    });
+  },
+
+  bindRavenErrors() {
+    window.$(document).on('ajaxError.raven', this.handleRavenErrors);
+  },
+
+  handleRavenErrors(event, req, config, err) {
+    const error = err || req.statusText;
+    const responseText = req.responseText || 'Unknown response text';
+
+    Raven.captureMessage(error, {
+      extra: {
+        type: config.type,
+        url: config.url,
+        data: config.data,
+        status: req.status,
+        response: responseText,
+        error,
+        event,
+      },
+    });
+  },
+
+  shouldSendSample() {
+    return Math.random() * 100 <= this.SAMPLE_RATE;
+  },
+};
+
+export default RavenConfig;
diff --git a/app/assets/javascripts/sidebar/components/assignees/assignee_title.js b/app/assets/javascripts/sidebar/components/assignees/assignee_title.js
new file mode 100644
index 00000000000..a9ad3708514
--- /dev/null
+++ b/app/assets/javascripts/sidebar/components/assignees/assignee_title.js
@@ -0,0 +1,41 @@
+export default {
+  name: 'AssigneeTitle',
+  props: {
+    loading: {
+      type: Boolean,
+      required: false,
+      default: false,
+    },
+    numberOfAssignees: {
+      type: Number,
+      required: true,
+    },
+    editable: {
+      type: Boolean,
+      required: true,
+    },
+  },
+  computed: {
+    assigneeTitle() {
+      const assignees = this.numberOfAssignees;
+      return assignees > 1 ? `${assignees} Assignees` : 'Assignee';
+    },
+  },
+  template: `
+    <div class="title hide-collapsed">
+      {{assigneeTitle}}
+      <i
+        v-if="loading"
+        aria-hidden="true"
+        class="fa fa-spinner fa-spin block-loading"
+      />
+      <a
+        v-if="editable"
+        class="edit-link pull-right"
+        href="#"
+      >
+        Edit
+      </a>
+    </div>
+  `,
+};
diff --git a/app/assets/javascripts/sidebar/components/assignees/assignees.js b/app/assets/javascripts/sidebar/components/assignees/assignees.js
new file mode 100644
index 00000000000..7e5feac622c
--- /dev/null
+++ b/app/assets/javascripts/sidebar/components/assignees/assignees.js
@@ -0,0 +1,224 @@
+export default {
+  name: 'Assignees',
+  data() {
+    return {
+      defaultRenderCount: 5,
+      defaultMaxCounter: 99,
+      showLess: true,
+    };
+  },
+  props: {
+    rootPath: {
+      type: String,
+      required: true,
+    },
+    users: {
+      type: Array,
+      required: true,
+    },
+    editable: {
+      type: Boolean,
+      required: true,
+    },
+  },
+  computed: {
+    firstUser() {
+      return this.users[0];
+    },
+    hasMoreThanTwoAssignees() {
+      return this.users.length > 2;
+    },
+    hasMoreThanOneAssignee() {
+      return this.users.length > 1;
+    },
+    hasAssignees() {
+      return this.users.length > 0;
+    },
+    hasNoUsers() {
+      return !this.users.length;
+    },
+    hasOneUser() {
+      return this.users.length === 1;
+    },
+    renderShowMoreSection() {
+      return this.users.length > this.defaultRenderCount;
+    },
+    numberOfHiddenAssignees() {
+      return this.users.length - this.defaultRenderCount;
+    },
+    isHiddenAssignees() {
+      return this.numberOfHiddenAssignees > 0;
+    },
+    hiddenAssigneesLabel() {
+      return `+ ${this.numberOfHiddenAssignees} more`;
+    },
+    collapsedTooltipTitle() {
+      const maxRender = Math.min(this.defaultRenderCount, this.users.length);
+      const renderUsers = this.users.slice(0, maxRender);
+      const names = renderUsers.map(u => u.name);
+
+      if (this.users.length > maxRender) {
+        names.push(`+ ${this.users.length - maxRender} more`);
+      }
+
+      return names.join(', ');
+    },
+    sidebarAvatarCounter() {
+      let counter = `+${this.users.length - 1}`;
+
+      if (this.users.length > this.defaultMaxCounter) {
+        counter = `${this.defaultMaxCounter}+`;
+      }
+
+      return counter;
+    },
+  },
+  methods: {
+    assignSelf() {
+      this.$emit('assign-self');
+    },
+    toggleShowLess() {
+      this.showLess = !this.showLess;
+    },
+    renderAssignee(index) {
+      return !this.showLess || (index < this.defaultRenderCount && this.showLess);
+    },
+    avatarUrl(user) {
+      return user.avatar || user.avatar_url;
+    },
+    assigneeUrl(user) {
+      return `${this.rootPath}${user.username}`;
+    },
+    assigneeAlt(user) {
+      return `${user.name}'s avatar`;
+    },
+    assigneeUsername(user) {
+      return `@${user.username}`;
+    },
+    shouldRenderCollapsedAssignee(index) {
+      const firstTwo = this.users.length <= 2 && index <= 2;
+
+      return index === 0 || firstTwo;
+    },
+  },
+  template: `
+    <div>
+      <div
+        class="sidebar-collapsed-icon sidebar-collapsed-user"
+        :class="{ 'multiple-users': hasMoreThanOneAssignee, 'has-tooltip': hasAssignees }"
+        data-container="body"
+        data-placement="left"
+        :title="collapsedTooltipTitle"
+      >
+        <i
+          v-if="hasNoUsers"
+          aria-label="No Assignee"
+          class="fa fa-user"
+        />
+        <button
+          type="button"
+          class="btn-link"
+          v-for="(user, index) in users"
+          v-if="shouldRenderCollapsedAssignee(index)"
+        >
+          <img
+            width="24"
+            class="avatar avatar-inline s24"
+            :alt="assigneeAlt(user)"
+            :src="avatarUrl(user)"
+          />
+          <span class="author">
+            {{ user.name }}
+          </span>
+        </button>
+        <button
+          v-if="hasMoreThanTwoAssignees"
+          class="btn-link"
+          type="button"
+        >
+          <span
+            class="avatar-counter sidebar-avatar-counter"
+          >
+            {{ sidebarAvatarCounter }}
+          </span>
+        </button>
+      </div>
+      <div class="value hide-collapsed">
+        <template v-if="hasNoUsers">
+          <span class="assign-yourself no-value">
+            No assignee
+            <template v-if="editable">
+             -
+              <button
+                type="button"
+                class="btn-link"
+                @click="assignSelf"
+              >
+                assign yourself
+              </button>
+            </template>
+          </span>
+        </template>
+        <template v-else-if="hasOneUser">
+          <a
+            class="author_link bold"
+            :href="assigneeUrl(firstUser)"
+          >
+            <img
+              width="32"
+              class="avatar avatar-inline s32"
+              :alt="assigneeAlt(firstUser)"
+              :src="avatarUrl(firstUser)"
+            />
+            <span class="author">
+              {{ firstUser.name }}
+            </span>
+            <span class="username">
+              {{ assigneeUsername(firstUser) }}
+            </span>
+          </a>
+        </template>
+        <template v-else>
+          <div class="user-list">
+            <div
+              class="user-item"
+              v-for="(user, index) in users"
+              v-if="renderAssignee(index)"
+            >
+              <a
+                class="user-link has-tooltip"
+                data-placement="bottom"
+                :href="assigneeUrl(user)"
+                :data-title="user.name"
+              >
+                <img
+                  width="32"
+                  class="avatar avatar-inline s32"
+                  :alt="assigneeAlt(user)"
+                  :src="avatarUrl(user)"
+                />
+              </a>
+            </div>
+          </div>
+          <div
+            v-if="renderShowMoreSection"
+            class="user-list-more"
+          >
+            <button
+              type="button"
+              class="btn-link"
+              @click="toggleShowLess"
+            >
+              <template v-if="showLess">
+                {{ hiddenAssigneesLabel }}
+              </template>
+              <template v-else>
+                - show less
+              </template>
+            </button>
+          </div>
+        </template>
+      </div>
+    </div>
+  `,
+};
diff --git a/app/assets/javascripts/sidebar/components/assignees/sidebar_assignees.js b/app/assets/javascripts/sidebar/components/assignees/sidebar_assignees.js
new file mode 100644
index 00000000000..1488a66c695
--- /dev/null
+++ b/app/assets/javascripts/sidebar/components/assignees/sidebar_assignees.js
@@ -0,0 +1,84 @@
+/* global Flash */
+
+import AssigneeTitle from './assignee_title';
+import Assignees from './assignees';
+
+import Store from '../../stores/sidebar_store';
+import Mediator from '../../sidebar_mediator';
+
+import eventHub from '../../event_hub';
+
+export default {
+  name: 'SidebarAssignees',
+  data() {
+    return {
+      mediator: new Mediator(),
+      store: new Store(),
+      loading: false,
+      field: '',
+    };
+  },
+  components: {
+    'assignee-title': AssigneeTitle,
+    assignees: Assignees,
+  },
+  methods: {
+    assignSelf() {
+      // Notify gl dropdown that we are now assigning to current user
+      this.$el.parentElement.dispatchEvent(new Event('assignYourself'));
+
+      this.mediator.assignYourself();
+      this.saveAssignees();
+    },
+    saveAssignees() {
+      this.loading = true;
+
+      function setLoadingFalse() {
+        this.loading = false;
+      }
+
+      this.mediator.saveAssignees(this.field)
+        .then(setLoadingFalse.bind(this))
+        .catch(() => {
+          setLoadingFalse();
+          return new Flash('Error occurred when saving assignees');
+        });
+    },
+  },
+  created() {
+    this.removeAssignee = this.store.removeAssignee.bind(this.store);
+    this.addAssignee = this.store.addAssignee.bind(this.store);
+    this.removeAllAssignees = this.store.removeAllAssignees.bind(this.store);
+
+    // Get events from glDropdown
+    eventHub.$on('sidebar.removeAssignee', this.removeAssignee);
+    eventHub.$on('sidebar.addAssignee', this.addAssignee);
+    eventHub.$on('sidebar.removeAllAssignees', this.removeAllAssignees);
+    eventHub.$on('sidebar.saveAssignees', this.saveAssignees);
+  },
+  beforeDestroy() {
+    eventHub.$off('sidebar.removeAssignee', this.removeAssignee);
+    eventHub.$off('sidebar.addAssignee', this.addAssignee);
+    eventHub.$off('sidebar.removeAllAssignees', this.removeAllAssignees);
+    eventHub.$off('sidebar.saveAssignees', this.saveAssignees);
+  },
+  beforeMount() {
+    this.field = this.$el.dataset.field;
+  },
+  template: `
+    <div>
+      <assignee-title
+        :number-of-assignees="store.assignees.length"
+        :loading="loading"
+        :editable="store.editable"
+      />
+      <assignees
+        class="value"
+        :root-path="store.rootPath"
+        :users="store.assignees"
+        :editable="store.editable"
+        @assign-self="assignSelf"
+      />
+    </div>
+  `,
+};
diff --git a/app/assets/javascripts/sidebar/components/time_tracking/collapsed_state.js b/app/assets/javascripts/sidebar/components/time_tracking/collapsed_state.js
new file mode 100644
index 00000000000..0da265053bd
--- /dev/null
+++ b/app/assets/javascripts/sidebar/components/time_tracking/collapsed_state.js
@@ -0,0 +1,97 @@
+import stopwatchSvg from 'icons/_icon_stopwatch.svg';
+
+import '../../../lib/utils/pretty_time';
+
+export default {
+  name: 'time-tracking-collapsed-state',
+  props: {
+    showComparisonState: {
+      type: Boolean,
+      required: true,
+    },
+    showSpentOnlyState: {
+      type: Boolean,
+      required: true,
+    },
+    showEstimateOnlyState: {
+      type: Boolean,
+      required: true,
+    },
+    showNoTimeTrackingState: {
+      type: Boolean,
+      required: true,
+    },
+    timeSpentHumanReadable: {
+      type: String,
+      required: false,
+      default: '',
+    },
+    timeEstimateHumanReadable: {
+      type: String,
+      required: false,
+      default: '',
+    },
+  },
+  computed: {
+    timeSpent() {
+      return this.abbreviateTime(this.timeSpentHumanReadable);
+    },
+    timeEstimate() {
+      return this.abbreviateTime(this.timeEstimateHumanReadable);
+    },
+    divClass() {
+      if (this.showComparisonState) {
+        return 'compare';
+      } else if (this.showEstimateOnlyState) {
+        return 'estimate-only';
+      } else if (this.showSpentOnlyState) {
+        return 'spend-only';
+      } else if (this.showNoTimeTrackingState) {
+        return 'no-tracking';
+      }
+
+      return '';
+    },
+    spanClass() {
+      if (this.showComparisonState) {
+        return '';
+      } else if (this.showEstimateOnlyState || this.showSpentOnlyState) {
+        return 'bold';
+      } else if (this.showNoTimeTrackingState) {
+        return 'no-value';
+      }
+
+      return '';
+    },
+    text() {
+      if (this.showComparisonState) {
+        return `${this.timeSpent} / ${this.timeEstimate}`;
+      } else if (this.showEstimateOnlyState) {
+        return `-- / ${this.timeEstimate}`;
+      } else if (this.showSpentOnlyState) {
+        return `${this.timeSpent} / --`;
+      } else if (this.showNoTimeTrackingState) {
+        return 'None';
+      }
+
+      return '';
+    },
+  },
+  methods: {
+    abbreviateTime(timeStr) {
+      return gl.utils.prettyTime.abbreviateTime(timeStr);
+    },
+  },
+  template: `
+    <div class="sidebar-collapsed-icon">
+      ${stopwatchSvg}
+      <div class="time-tracking-collapsed-summary">
+        <div :class="divClass">
+          <span :class="spanClass">
+            {{ text }}
+          </span>
+        </div>
+      </div>
+    </div>
+    `,
+};
diff --git a/app/assets/javascripts/sidebar/components/time_tracking/comparison_pane.js b/app/assets/javascripts/sidebar/components/time_tracking/comparison_pane.js
new file mode 100644
index 00000000000..40f5c89c5bb
--- /dev/null
+++ b/app/assets/javascripts/sidebar/components/time_tracking/comparison_pane.js
@@ -0,0 +1,98 @@
+import '../../../lib/utils/pretty_time';
+
+const prettyTime = gl.utils.prettyTime;
+
+export default {
+  name: 'time-tracking-comparison-pane',
+  props: {
+    timeSpent: {
+      type: Number,
+      required: true,
+    },
+    timeEstimate: {
+      type: Number,
+      required: true,
+    },
+    timeSpentHumanReadable: {
+      type: String,
+      required: true,
+    },
+    timeEstimateHumanReadable: {
+      type: String,
+      required: true,
+    },
+  },
+  computed: {
+    parsedRemaining() {
+      const diffSeconds = this.timeEstimate - this.timeSpent;
+      return prettyTime.parseSeconds(diffSeconds);
+    },
+    timeRemainingHumanReadable() {
+      return prettyTime.stringifyTime(this.parsedRemaining);
+    },
+    timeRemainingTooltip() {
+      const prefix = this.timeRemainingMinutes < 0 ? 'Over by' : 'Time remaining:';
+      return `${prefix} ${this.timeRemainingHumanReadable}`;
+    },
+    /* Diff values for comparison meter */
+    timeRemainingMinutes() {
+      return this.timeEstimate - this.timeSpent;
+    },
+    timeRemainingPercent() {
+      return `${Math.floor((this.timeSpent / this.timeEstimate) * 100)}%`;
+    },
+    timeRemainingStatusClass() {
+      return this.timeEstimate >= this.timeSpent ? 'within_estimate' : 'over_estimate';
+    },
+    /* Parsed time values */
+    parsedEstimate() {
+      return prettyTime.parseSeconds(this.timeEstimate);
+    },
+    parsedSpent() {
+      return prettyTime.parseSeconds(this.timeSpent);
+    },
+  },
+  template: `
+    <div class="time-tracking-comparison-pane">
+      <div
+        class="compare-meter"
+        data-toggle="tooltip"
+        data-placement="top"
+        role="timeRemainingDisplay"
+        :aria-valuenow="timeRemainingTooltip"
+        :title="timeRemainingTooltip"
+        :data-original-title="timeRemainingTooltip"
+        :class="timeRemainingStatusClass"
+      >
+        <div
+          class="meter-container"
+          role="timeSpentPercent"
+          :aria-valuenow="timeRemainingPercent"
+        >
+          <div
+            :style="{ width: timeRemainingPercent }"
+            class="meter-fill"
+          />
+        </div>
+        <div class="compare-display-container">
+          <div class="compare-display pull-left">
+            <span class="compare-label">
+              Spent
+            </span>
+            <span class="compare-value spent">
+              {{ timeSpentHumanReadable }}
+            </span>
+          </div>
+          <div class="compare-display estimated pull-right">
+            <span class="compare-label">
+              Est
+            </span>
+            <span class="compare-value">
+              {{ timeEstimateHumanReadable }}
+            </span>
+          </div>
+        </div>
+      </div>
+    </div>
+  `,
+};
diff --git a/app/assets/javascripts/sidebar/components/time_tracking/estimate_only_pane.js b/app/assets/javascripts/sidebar/components/time_tracking/estimate_only_pane.js
new file mode 100644
index 00000000000..ad1b9179db0
--- /dev/null
+++ b/app/assets/javascripts/sidebar/components/time_tracking/estimate_only_pane.js
@@ -0,0 +1,17 @@
+export default {
+  name: 'time-tracking-estimate-only-pane',
+  props: {
+    timeEstimateHumanReadable: {
+      type: String,
+      required: true,
+    },
+  },
+  template: `
+    <div class="time-tracking-estimate-only-pane">
+      <span class="bold">
+        Estimated:
+      </span>
+      {{ timeEstimateHumanReadable }}
+    </div>
+  `,
+};
diff --git a/app/assets/javascripts/sidebar/components/time_tracking/help_state.js b/app/assets/javascripts/sidebar/components/time_tracking/help_state.js
new file mode 100644
index 00000000000..b2a77462fe0
--- /dev/null
+++ b/app/assets/javascripts/sidebar/components/time_tracking/help_state.js
@@ -0,0 +1,44 @@
+export default {
+  name: 'time-tracking-help-state',
+  props: {
+    rootPath: {
+      type: String,
+      required: true,
+    },
+  },
+  computed: {
+    href() {
+      return `${this.rootPath}help/workflow/time_tracking.md`;
+    },
+  },
+  template: `
+    <div class="time-tracking-help-state">
+      <div class="time-tracking-info">
+        <h4>
+          Track time with slash commands
+        </h4>
+        <p>
+          Slash commands can be used in the issues description and comment boxes.
+        </p>
+        <p>
+          <code>
+            /estimate
+          </code>
+          will update the estimated time with the latest command.
+        </p>
+        <p>
+          <code>
+            /spend
+          </code>
+          will update the sum of the time spent.
+        </p>
+        <a
+          class="btn btn-default learn-more-button"
+          :href="href"
+        >
+          Learn more
+        </a>
+      </div>
+    </div>
+  `,
+};
diff --git a/app/assets/javascripts/sidebar/components/time_tracking/no_tracking_pane.js b/app/assets/javascripts/sidebar/components/time_tracking/no_tracking_pane.js
new file mode 100644
index 00000000000..d1dd1dcdd27
--- /dev/null
+++ b/app/assets/javascripts/sidebar/components/time_tracking/no_tracking_pane.js
@@ -0,0 +1,10 @@
+export default {
+  name: 'time-tracking-no-tracking-pane',
+  template: `
+    <div class="time-tracking-no-tracking-pane">
+      <span class="no-value">
+        No estimate or time spent
+      </span>
+    </div>
+  `,
+};
diff --git a/app/assets/javascripts/sidebar/components/time_tracking/sidebar_time_tracking.js b/app/assets/javascripts/sidebar/components/time_tracking/sidebar_time_tracking.js
new file mode 100644
index 00000000000..244b67b3ad9
--- /dev/null
+++ b/app/assets/javascripts/sidebar/components/time_tracking/sidebar_time_tracking.js
@@ -0,0 +1,51 @@
+import '~/smart_interval';
+
+import timeTracker from './time_tracker';
+
+import Store from '../../stores/sidebar_store';
+import Mediator from '../../sidebar_mediator';
+
+export default {
+  data() {
+    return {
+      mediator: new Mediator(),
+      store: new Store(),
+    };
+  },
+  components: {
+    'issuable-time-tracker': timeTracker,
+  },
+  methods: {
+    listenForSlashCommands() {
+      $(document).on('ajax:success', '.gfm-form', this.slashCommandListened);
+    },
+    slashCommandListened(e, data) {
+      const subscribedCommands = ['spend_time', 'time_estimate'];
+      let changedCommands;
+      if (data !== undefined) {
+        changedCommands = data.commands_changes
+          ? Object.keys(data.commands_changes)
+          : [];
+      } else {
+        changedCommands = [];
+      }
+      if (changedCommands && _.intersection(subscribedCommands, changedCommands).length) {
+        this.mediator.fetch();
+      }
+    },
+  },
+  mounted() {
+    this.listenForSlashCommands();
+  },
+  template: `
+    <div class="block">
+      <issuable-time-tracker
+        :time_estimate="store.timeEstimate"
+        :time_spent="store.totalTimeSpent"
+        :human_time_estimate="store.humanTimeEstimate"
+        :human_time_spent="store.humanTotalTimeSpent"
+        :rootPath="store.rootPath"
+      />
+    </div>
+  `,
+};
diff --git a/app/assets/javascripts/sidebar/components/time_tracking/spent_only_pane.js b/app/assets/javascripts/sidebar/components/time_tracking/spent_only_pane.js
new file mode 100644
index 00000000000..bf987562647
--- /dev/null
+++ b/app/assets/javascripts/sidebar/components/time_tracking/spent_only_pane.js
@@ -0,0 +1,15 @@
+export default {
+  name: 'time-tracking-spent-only-pane',
+  props: {
+    timeSpentHumanReadable: {
+      type: String,
+      required: true,
+    },
+  },
+  template: `
+    <div class="time-tracking-spend-only-pane">
+      <span class="bold">Spent:</span>
+      {{ timeSpentHumanReadable }}
+    </div>
+  `,
+};
diff --git a/app/assets/javascripts/sidebar/components/time_tracking/time_tracker.js b/app/assets/javascripts/sidebar/components/time_tracking/time_tracker.js
new file mode 100644
index 00000000000..ed0d71a4f79
--- /dev/null
+++ b/app/assets/javascripts/sidebar/components/time_tracking/time_tracker.js
@@ -0,0 +1,163 @@
+import timeTrackingHelpState from './help_state';
+import timeTrackingCollapsedState from './collapsed_state';
+import timeTrackingSpentOnlyPane from './spent_only_pane';
+import timeTrackingNoTrackingPane from './no_tracking_pane';
+import timeTrackingEstimateOnlyPane from './estimate_only_pane';
+import timeTrackingComparisonPane from './comparison_pane';
+
+import eventHub from '../../event_hub';
+
+export default {
+  name: 'issuable-time-tracker',
+  props: {
+    time_estimate: {
+      type: Number,
+      required: true,
+    },
+    time_spent: {
+      type: Number,
+      required: true,
+    },
+    human_time_estimate: {
+      type: String,
+      required: false,
+      default: '',
+    },
+    human_time_spent: {
+      type: String,
+      required: false,
+      default: '',
+    },
+    rootPath: {
+      type: String,
+      required: true,
+    },
+  },
+  data() {
+    return {
+      showHelp: false,
+    };
+  },
+  components: {
+    'time-tracking-collapsed-state': timeTrackingCollapsedState,
+    'time-tracking-estimate-only-pane': timeTrackingEstimateOnlyPane,
+    'time-tracking-spent-only-pane': timeTrackingSpentOnlyPane,
+    'time-tracking-no-tracking-pane': timeTrackingNoTrackingPane,
+    'time-tracking-comparison-pane': timeTrackingComparisonPane,
+    'time-tracking-help-state': timeTrackingHelpState,
+  },
+  computed: {
+    timeSpent() {
+      return this.time_spent;
+    },
+    timeEstimate() {
+      return this.time_estimate;
+    },
+    timeEstimateHumanReadable() {
+      return this.human_time_estimate;
+    },
+    timeSpentHumanReadable() {
+      return this.human_time_spent;
+    },
+    hasTimeSpent() {
+      return !!this.timeSpent;
+    },
+    hasTimeEstimate() {
+      return !!this.timeEstimate;
+    },
+    showComparisonState() {
+      return this.hasTimeEstimate && this.hasTimeSpent;
+    },
+    showEstimateOnlyState() {
+      return this.hasTimeEstimate && !this.hasTimeSpent;
+    },
+    showSpentOnlyState() {
+      return this.hasTimeSpent && !this.hasTimeEstimate;
+    },
+    showNoTimeTrackingState() {
+      return !this.hasTimeEstimate && !this.hasTimeSpent;
+    },
+    showHelpState() {
+      return !!this.showHelp;
+    },
+  },
+  methods: {
+    toggleHelpState(show) {
+      this.showHelp = show;
+    },
+    update(data) {
+      this.time_estimate = data.time_estimate;
+      this.time_spent = data.time_spent;
+      this.human_time_estimate = data.human_time_estimate;
+      this.human_time_spent = data.human_time_spent;
+    },
+  },
+  created() {
+    eventHub.$on('timeTracker:updateData', this.update);
+  },
+  template: `
+    <div
+      class="time_tracker time-tracking-component-wrap"
+      v-cloak
+    >
+      <time-tracking-collapsed-state
+        :show-comparison-state="showComparisonState"
+        :show-no-time-tracking-state="showNoTimeTrackingState"
+        :show-help-state="showHelpState"
+        :show-spent-only-state="showSpentOnlyState"
+        :show-estimate-only-state="showEstimateOnlyState"
+        :time-spent-human-readable="timeSpentHumanReadable"
+        :time-estimate-human-readable="timeEstimateHumanReadable"
+      />
+      <div class="title hide-collapsed">
+        Time tracking
+        <div
+          class="help-button pull-right"
+          v-if="!showHelpState"
+          @click="toggleHelpState(true)"
+        >
+            <i
+              class="fa fa-question-circle"
+              aria-hidden="true"
+            />
+        </div>
+        <div
+          class="close-help-button pull-right"
+          v-if="showHelpState"
+          @click="toggleHelpState(false)"
+        >
+          <i
+            class="fa fa-close"
+            aria-hidden="true"
+          />
+        </div>
+      </div>
+      <div class="time-tracking-content hide-collapsed">
+        <time-tracking-estimate-only-pane
+          v-if="showEstimateOnlyState"
+          :time-estimate-human-readable="timeEstimateHumanReadable"
+        />
+        <time-tracking-spent-only-pane
+          v-if="showSpentOnlyState"
+          :time-spent-human-readable="timeSpentHumanReadable"
+        />
+        <time-tracking-no-tracking-pane
+          v-if="showNoTimeTrackingState"
+        />
+        <time-tracking-comparison-pane
+          v-if="showComparisonState"
+          :time-estimate="timeEstimate"
+          :time-spent="timeSpent"
+          :time-spent-human-readable="timeSpentHumanReadable"
+          :time-estimate-human-readable="timeEstimateHumanReadable"
+        />
+        <transition name="help-state-toggle">
+          <time-tracking-help-state
+            v-if="showHelpState"
+            :rootPath="rootPath"
+          />
+        </transition>
+      </div>
+    </div>
+  `,
+};
diff --git a/app/assets/javascripts/sidebar/event_hub.js b/app/assets/javascripts/sidebar/event_hub.js
new file mode 100644
index 00000000000..0948c2e5352
--- /dev/null
+++ b/app/assets/javascripts/sidebar/event_hub.js
@@ -0,0 +1,3 @@
+import Vue from 'vue';
+
+export default new Vue();
diff --git a/app/assets/javascripts/sidebar/services/sidebar_service.js b/app/assets/javascripts/sidebar/services/sidebar_service.js
new file mode 100644
index 00000000000..5a82d01dc41
--- /dev/null
+++ b/app/assets/javascripts/sidebar/services/sidebar_service.js
@@ -0,0 +1,28 @@
+import Vue from 'vue';
+import VueResource from 'vue-resource';
+
+Vue.use(VueResource);
+
+export default class SidebarService {
+  constructor(endpoint) {
+    if (!SidebarService.singleton) {
+      this.endpoint = endpoint;
+
+      SidebarService.singleton = this;
+    }
+
+    return SidebarService.singleton;
+  }
+
+  get() {
+    return Vue.http.get(this.endpoint);
+  }
+
+  update(key, data) {
+    return Vue.http.put(this.endpoint, {
+      [key]: data,
+    }, {
+      emulateJSON: true,
+    });
+  }
+}
diff --git a/app/assets/javascripts/sidebar/sidebar_bundle.js b/app/assets/javascripts/sidebar/sidebar_bundle.js
new file mode 100644
index 00000000000..2b02af87d8a
--- /dev/null
+++ b/app/assets/javascripts/sidebar/sidebar_bundle.js
@@ -0,0 +1,24 @@
+import Vue from 'vue';
+import sidebarTimeTracking from './components/time_tracking/sidebar_time_tracking';
+import sidebarAssignees from './components/assignees/sidebar_assignees';
+
+import Mediator from './sidebar_mediator';
+
+function domContentLoaded() {
+  const mediator = new Mediator(gl.sidebarOptions);
+  mediator.fetch();
+
+  const sidebarAssigneesEl = document.querySelector('#js-vue-sidebar-assignees');
+
+  // Only create the sidebarAssignees vue app if it is found in the DOM
+  // We currently do not use sidebarAssignees for the MR page
+  if (sidebarAssigneesEl) {
+    new Vue(sidebarAssignees).$mount(sidebarAssigneesEl);
+  }
+
+  new Vue(sidebarTimeTracking).$mount('#issuable-time-tracker');
+}
+
+document.addEventListener('DOMContentLoaded', domContentLoaded);
+
+export default domContentLoaded;
diff --git a/app/assets/javascripts/sidebar/sidebar_mediator.js b/app/assets/javascripts/sidebar/sidebar_mediator.js
new file mode 100644
index 00000000000..5ccfb4ee9c1
--- /dev/null
+++ b/app/assets/javascripts/sidebar/sidebar_mediator.js
@@ -0,0 +1,38 @@
+/* global Flash */
+
+import Service from './services/sidebar_service';
+import Store from './stores/sidebar_store';
+
+export default class SidebarMediator {
+  constructor(options) {
+    if (!SidebarMediator.singleton) {
+      this.store = new Store(options);
+      this.service = new Service(options.endpoint);
+      SidebarMediator.singleton = this;
+    }
+
+    return SidebarMediator.singleton;
+  }
+
+  assignYourself() {
+    this.store.addAssignee(this.store.currentUser);
+  }
+
+  saveAssignees(field) {
+    const selected = this.store.assignees.map(u => u.id);
+
+    // If there are no ids, that means we have to unassign (which is id = 0)
+    // And it only accepts an array, hence [0]
+    return this.service.update(field, selected.length === 0 ? [0] : selected);
+  }
+
+  fetch() {
+    this.service.get()
+      .then((response) => {
+        const data = response.json();
+        this.store.setAssigneeData(data);
+        this.store.setTimeTrackingData(data);
+      })
+      .catch(() => new Flash('Error occured when fetching sidebar data'));
+  }
+}
diff --git a/app/assets/javascripts/sidebar/stores/sidebar_store.js b/app/assets/javascripts/sidebar/stores/sidebar_store.js
new file mode 100644
index 00000000000..2d44c05bb8d
--- /dev/null
+++ b/app/assets/javascripts/sidebar/stores/sidebar_store.js
@@ -0,0 +1,52 @@
+export default class SidebarStore {
+  constructor(store) {
+    if (!SidebarStore.singleton) {
+      const { currentUser, rootPath, editable } = store;
+      this.currentUser = currentUser;
+      this.rootPath = rootPath;
+      this.editable = editable;
+      this.timeEstimate = 0;
+      this.totalTimeSpent = 0;
+      this.humanTimeEstimate = '';
+      this.humanTimeSpent = '';
+      this.assignees = [];
+
+      SidebarStore.singleton = this;
+    }
+
+    return SidebarStore.singleton;
+  }
+
+  setAssigneeData(data) {
+    if (data.assignees) {
+      this.assignees = data.assignees;
+    }
+  }
+
+  setTimeTrackingData(data) {
+    this.timeEstimate = data.time_estimate;
+    this.totalTimeSpent = data.total_time_spent;
+    this.humanTimeEstimate = data.human_time_estimate;
+    this.humanTotalTimeSpent = data.human_total_time_spent;
+  }
+
+  addAssignee(assignee) {
+    if (!this.findAssignee(assignee)) {
+      this.assignees.push(assignee);
+    }
+  }
+
+  findAssignee(findAssignee) {
+    return this.assignees.filter(assignee => assignee.id === findAssignee.id)[0];
+  }
+
+  removeAssignee(removeAssignee) {
+    if (removeAssignee) {
+      this.assignees = this.assignees.filter(assignee => assignee.id !== removeAssignee.id);
+    }
+  }
+
+  removeAllAssignees() {
+    this.assignees = [];
+  }
+}
diff --git a/app/assets/javascripts/signin_tabs_memoizer.js b/app/assets/javascripts/signin_tabs_memoizer.js
index d811d1cd53a..2587facc582 100644
--- a/app/assets/javascripts/signin_tabs_memoizer.js
+++ b/app/assets/javascripts/signin_tabs_memoizer.js
@@ -1,5 +1,7 @@
 /* eslint no-param-reassign: ["error", { "props": false }]*/
 /* eslint no-new: "off" */
+import AccessorUtilities from './lib/utils/accessor';
+
 ((global) => {
   /**
    * Memorize the last selected tab after reloading a page.
@@ -9,6 +11,8 @@
     constructor({ currentTabKey = 'current_signin_tab', tabSelector = 'ul.nav-tabs' } = {}) {
       this.currentTabKey = currentTabKey;
       this.tabSelector = tabSelector;
+      this.isLocalStorageAvailable = AccessorUtilities.isLocalStorageAccessSafe();
+
       this.bootstrap();
     }
 
@@ -37,11 +41,15 @@
     }
 
     saveData(val) {
-      localStorage.setItem(this.currentTabKey, val);
+      if (!this.isLocalStorageAvailable) return undefined;
+
+      return window.localStorage.setItem(this.currentTabKey, val);
     }
 
     readData() {
-      return localStorage.getItem(this.currentTabKey);
+      if (!this.isLocalStorageAvailable) return null;
+
+      return window.localStorage.getItem(this.currentTabKey);
     }
   }
 
diff --git a/app/assets/javascripts/subbable_resource.js b/app/assets/javascripts/subbable_resource.js
deleted file mode 100644
index d8191605128..00000000000
--- a/app/assets/javascripts/subbable_resource.js
+++ /dev/null
@@ -1,51 +0,0 @@
-(() => {
-/*
-*   SubbableResource can be extended to provide a pubsub-style service for one-off REST
-*   calls. Subscribe by passing a callback or render method you will use to handle responses.
- *
-* */
-
-  class SubbableResource {
-    constructor(resourcePath) {
-      this.endpoint = resourcePath;
-
-      // TODO: Switch to axios.create
-      this.resource = $.ajax;
-      this.subscribers = [];
-    }
-
-    subscribe(callback) {
-      this.subscribers.push(callback);
-    }
-
-    publish(newResponse) {
-      const responseCopy = _.extend({}, newResponse);
-      this.subscribers.forEach((fn) => {
-        fn(responseCopy);
-      });
-      return newResponse;
-    }
-
-    get(payload) {
-      return this.resource(payload)
-        .then(data => this.publish(data));
-    }
-
-    post(payload) {
-      return this.resource(payload)
-        .then(data => this.publish(data));
-    }
-
-    put(payload) {
-      return this.resource(payload)
-        .then(data => this.publish(data));
-    }
-
-    delete(payload) {
-      return this.resource(payload)
-        .then(data => this.publish(data));
-    }
-  }
-
-  gl.SubbableResource = SubbableResource;
-})(window.gl || (window.gl = {}));
diff --git a/app/assets/javascripts/subscription_select.js b/app/assets/javascripts/subscription_select.js
index 8b25f43ffc7..0cd591c7320 100644
--- a/app/assets/javascripts/subscription_select.js
+++ b/app/assets/javascripts/subscription_select.js
@@ -19,8 +19,8 @@
               return label;
             };
           })(this),
-          clicked: function(item, $el, e) {
-            return e.preventDefault();
+          clicked: function(options) {
+            return options.e.preventDefault();
           },
           id: function(obj, el) {
             return $(el).data("id");
diff --git a/app/assets/javascripts/users/calendar.js b/app/assets/javascripts/users/calendar.js
index 754d448564f..32ffa2f0ac0 100644
--- a/app/assets/javascripts/users/calendar.js
+++ b/app/assets/javascripts/users/calendar.js
@@ -168,15 +168,23 @@ import d3 from 'd3';
     };
 
     Calendar.prototype.renderKey = function() {
-      var keyColors;
-      keyColors = ['#ededed', this.colorKey(0), this.colorKey(1), this.colorKey(2), this.colorKey(3)];
-      return this.svg.append('g').attr('transform', "translate(18, " + (this.daySizeWithSpace * 8 + 16) + ")").selectAll('rect').data(keyColors).enter().append('rect').attr('width', this.daySize).attr('height', this.daySize).attr('x', (function(_this) {
-        return function(color, i) {
-          return _this.daySizeWithSpace * i;
-        };
-      })(this)).attr('y', 0).attr('fill', function(color) {
-        return color;
-      });
+      const keyValues = ['no contributions', '1-9 contributions', '10-19 contributions', '20-29 contributions', '30+ contributions'];
+      const keyColors = ['#ededed', this.colorKey(0), this.colorKey(1), this.colorKey(2), this.colorKey(3)];
+
+      this.svg.append('g')
+        .attr('transform', `translate(18, ${this.daySizeWithSpace * 8 + 16})`)
+        .selectAll('rect')
+          .data(keyColors)
+          .enter()
+          .append('rect')
+            .attr('width', this.daySize)
+            .attr('height', this.daySize)
+            .attr('x', (color, i) => this.daySizeWithSpace * i)
+            .attr('y', 0)
+            .attr('fill', color => color)
+            .attr('class', 'js-tooltip')
+            .attr('title', (color, i) => keyValues[i])
+            .attr('data-container', 'body');
     };
 
     Calendar.prototype.initColor = function() {
diff --git a/app/assets/javascripts/users_select.js b/app/assets/javascripts/users_select.js
index 68cf9ced3ef..be29b08c343 100644
--- a/app/assets/javascripts/users_select.js
+++ b/app/assets/javascripts/users_select.js
@@ -1,6 +1,7 @@
 /* eslint-disable func-names, space-before-function-paren, one-var, no-var, prefer-rest-params, wrap-iife, quotes, max-len, one-var-declaration-per-line, vars-on-top, prefer-arrow-callback, consistent-return, comma-dangle, object-shorthand, no-shadow, no-unused-vars, no-else-return, no-self-compare, prefer-template, no-unused-expressions, no-lonely-if, yoda, prefer-spread, no-void, camelcase, no-param-reassign */
 /* global Issuable */
-/* global ListUser */
+
+import eventHub from './sidebar/event_hub';
 
 (function() {
   var bind = function(fn, me) { return function() { return fn.apply(me, arguments); }; },
@@ -54,42 +55,115 @@
           selectedIdDefault = (defaultNullUser && showNullUser) ? 0 : null;
           selectedId = $dropdown.data('selected') || selectedIdDefault;
 
-          var updateIssueBoardsIssue = function () {
-            $loading.removeClass('hidden').fadeIn();
-            gl.issueBoards.BoardsStore.detail.issue.update($dropdown.attr('data-issue-update'))
-              .then(function () {
-                $loading.fadeOut();
-              })
-              .catch(function () {
-                $loading.fadeOut();
-              });
+          const assignYourself = function () {
+            const unassignedSelected = $dropdown.closest('.selectbox')
+              .find(`input[name='${$dropdown.data('field-name')}'][value=0]`);
+
+            if (unassignedSelected) {
+              unassignedSelected.remove();
+            }
+
+            // Save current selected user to the DOM
+            const input = document.createElement('input');
+            input.type = 'hidden';
+            input.name = $dropdown.data('field-name');
+
+            const currentUserInfo = $dropdown.data('currentUserInfo');
+
+            if (currentUserInfo) {
+              input.value = currentUserInfo.id;
+              input.dataset.meta = currentUserInfo.name;
+            } else if (_this.currentUser) {
+              input.value = _this.currentUser.id;
+            }
+
+            if ($selectbox) {
+              $dropdown.parent().before(input);
+            } else {
+              $dropdown.after(input);
+            }
+          };
+
+          if ($block[0]) {
+            $block[0].addEventListener('assignYourself', assignYourself);
+          }
+
+          const getSelectedUserInputs = function() {
+            return $selectbox
+              .find(`input[name="${$dropdown.data('field-name')}"]`);
+          };
+
+          const getSelected = function() {
+            return getSelectedUserInputs()
+              .map((index, input) => parseInt(input.value, 10))
+              .get();
+          };
+
+          const checkMaxSelect = function() {
+            const maxSelect = $dropdown.data('max-select');
+            if (maxSelect) {
+              const selected = getSelected();
+
+              if (selected.length > maxSelect) {
+                const firstSelectedId = selected[0];
+                const firstSelected = $dropdown.closest('.selectbox')
+                  .find(`input[name='${$dropdown.data('field-name')}'][value=${firstSelectedId}]`);
+
+                firstSelected.remove();
+                eventHub.$emit('sidebar.removeAssignee', {
+                  id: firstSelectedId,
+                });
+              }
+            }
+          };
+
+          const getMultiSelectDropdownTitle = function(selectedUser, isSelected) {
+            const selectedUsers = getSelected()
+              .filter(u => u !== 0);
+
+            const firstUser = getSelectedUserInputs()
+              .map((index, input) => ({
+                name: input.dataset.meta,
+                value: parseInt(input.value, 10),
+              }))
+              .filter(u => u.id !== 0)
+              .get(0);
+
+            if (selectedUsers.length === 0) {
+              return 'Unassigned';
+            } else if (selectedUsers.length === 1) {
+              return firstUser.name;
+            } else if (isSelected) {
+              const otherSelected = selectedUsers.filter(s => s !== selectedUser.id);
+              return `${selectedUser.name} + ${otherSelected.length} more`;
+            } else {
+              return `${firstUser.name} + ${selectedUsers.length - 1} more`;
+            }
           };
 
           $('.assign-to-me-link').on('click', (e) => {
             e.preventDefault();
             $(e.currentTarget).hide();
-            const $input = $(`input[name="${$dropdown.data('field-name')}"]`);
-            $input.val(gon.current_user_id);
-            selectedId = $input.val();
-            $dropdown.find('.dropdown-toggle-text').text(gon.current_user_fullname).removeClass('is-default');
-          });
 
-          $block.on('click', '.js-assign-yourself', function(e) {
-            e.preventDefault();
-
-            if ($dropdown.hasClass('js-issue-board-sidebar')) {
-              gl.issueBoards.boardStoreIssueSet('assignee', new ListUser({
-                id: _this.currentUser.id,
-                username: _this.currentUser.username,
-                name: _this.currentUser.name,
-                avatar_url: _this.currentUser.avatar_url
-              }));
+            if ($dropdown.data('multiSelect')) {
+              assignYourself();
+              checkMaxSelect();
 
-              updateIssueBoardsIssue();
+              const currentUserInfo = $dropdown.data('currentUserInfo');
+              $dropdown.find('.dropdown-toggle-text').text(getMultiSelectDropdownTitle(currentUserInfo)).removeClass('is-default');
             } else {
-              return assignTo(_this.currentUser.id);
+              const $input = $(`input[name="${$dropdown.data('field-name')}"]`);
+              $input.val(gon.current_user_id);
+              selectedId = $input.val();
+              $dropdown.find('.dropdown-toggle-text').text(gon.current_user_fullname).removeClass('is-default');
             }
           });
+
+          $block.on('click', '.js-assign-yourself', (e) => {
+            e.preventDefault();
+            return assignTo(_this.currentUser.id);
+          });
+
           assignTo = function(selected) {
             var data;
             data = {};
@@ -97,6 +171,7 @@
             data[abilityName].assignee_id = selected != null ? selected : null;
             $loading.removeClass('hidden').fadeIn();
             $dropdown.trigger('loading.gl.dropdown');
+
             return $.ajax({
               type: 'PUT',
               dataType: 'json',
@@ -106,7 +181,6 @@
               var user;
               $dropdown.trigger('loaded.gl.dropdown');
               $loading.fadeOut();
-              $selectbox.hide();
               if (data.assignee) {
                 user = {
                   name: data.assignee.name,
@@ -133,51 +207,90 @@
               var isAuthorFilter;
               isAuthorFilter = $('.js-author-search');
               return _this.users(term, options, function(users) {
-                var anyUser, index, j, len, name, obj, showDivider;
-                if (term.length === 0) {
-                  showDivider = 0;
-                  if (firstUser) {
-                    // Move current user to the front of the list
-                    for (index = j = 0, len = users.length; j < len; index = (j += 1)) {
-                      obj = users[index];
-                      if (obj.username === firstUser) {
-                        users.splice(index, 1);
-                        users.unshift(obj);
-                        break;
-                      }
+                // GitLabDropdownFilter returns this.instance
+                // GitLabDropdownRemote returns this.options.instance
+                const glDropdown = this.instance || this.options.instance;
+                glDropdown.options.processData(term, users, callback);
+              }.bind(this));
+            },
+            processData: function(term, users, callback) {
+              let anyUser;
+              let index;
+              let j;
+              let len;
+              let name;
+              let obj;
+              let showDivider;
+              if (term.length === 0) {
+                showDivider = 0;
+                if (firstUser) {
+                  // Move current user to the front of the list
+                  for (index = j = 0, len = users.length; j < len; index = (j += 1)) {
+                    obj = users[index];
+                    if (obj.username === firstUser) {
+                      users.splice(index, 1);
+                      users.unshift(obj);
+                      break;
                     }
                   }
-                  if (showNullUser) {
-                    showDivider += 1;
-                    users.unshift({
-                      beforeDivider: true,
-                      name: 'Unassigned',
-                      id: 0
-                    });
-                  }
-                  if (showAnyUser) {
-                    showDivider += 1;
-                    name = showAnyUser;
-                    if (name === true) {
-                      name = 'Any User';
-                    }
-                    anyUser = {
-                      beforeDivider: true,
-                      name: name,
-                      id: null
-                    };
-                    users.unshift(anyUser);
+                }
+                if (showNullUser) {
+                  showDivider += 1;
+                  users.unshift({
+                    beforeDivider: true,
+                    name: 'Unassigned',
+                    id: 0
+                  });
+                }
+                if (showAnyUser) {
+                  showDivider += 1;
+                  name = showAnyUser;
+                  if (name === true) {
+                    name = 'Any User';
                   }
+                  anyUser = {
+                    beforeDivider: true,
+                    name: name,
+                    id: null
+                  };
+                  users.unshift(anyUser);
                 }
+
                 if (showDivider) {
-                  users.splice(showDivider, 0, "divider");
+                  users.splice(showDivider, 0, 'divider');
                 }
 
-                callback(users);
-                if (showMenuAbove) {
-                  $dropdown.data('glDropdown').positionMenuAbove();
+                if ($dropdown.hasClass('js-multiselect')) {
+                  const selected = getSelected().filter(i => i !== 0);
+
+                  if (selected.length > 0) {
+                    if ($dropdown.data('dropdown-header')) {
+                      showDivider += 1;
+                      users.splice(showDivider, 0, {
+                        header: $dropdown.data('dropdown-header'),
+                      });
+                    }
+
+                    const selectedUsers = users
+                      .filter(u => selected.indexOf(u.id) !== -1)
+                      .sort((a, b) => a.name > b.name);
+
+                    users = users.filter(u => selected.indexOf(u.id) === -1);
+
+                    selectedUsers.forEach((selectedUser) => {
+                      showDivider += 1;
+                      users.splice(showDivider, 0, selectedUser);
+                    });
+
+                    users.splice(showDivider + 1, 0, 'divider');
+                  }
                 }
-              });
+              }
+
+              callback(users);
+              if (showMenuAbove) {
+                $dropdown.data('glDropdown').positionMenuAbove();
+              }
             },
             filterable: true,
             filterRemote: true,
@@ -186,7 +299,22 @@
             },
             selectable: true,
             fieldName: $dropdown.data('field-name'),
-            toggleLabel: function(selected, el) {
+            toggleLabel: function(selected, el, glDropdown) {
+              const inputValue = glDropdown.filterInput.val();
+
+              if (this.multiSelect && inputValue === '') {
+                // Remove non-users from the fullData array
+                const users = glDropdown.filteredFullData();
+                const callback = glDropdown.parseData.bind(glDropdown);
+
+                // Update the data model
+                this.processData(inputValue, users, callback);
+              }
+
+              if (this.multiSelect) {
+                return getMultiSelectDropdownTitle(selected, $(el).hasClass('is-active'));
+              }
+
               if (selected && 'id' in selected && $(el).hasClass('is-active')) {
                 $dropdown.find('.dropdown-toggle-text').removeClass('is-default');
                 if (selected.text) {
@@ -200,22 +328,81 @@
               }
             },
             defaultLabel: defaultLabel,
-            inputId: 'issue_assignee_id',
             hidden: function(e) {
-              $selectbox.hide();
-              // display:block overrides the hide-collapse rule
-              return $value.css('display', '');
+              if ($dropdown.hasClass('js-multiselect')) {
+                eventHub.$emit('sidebar.saveAssignees');
+              }
+
+              if (!$dropdown.data('always-show-selectbox')) {
+                $selectbox.hide();
+
+                // Recalculate where .value is because vue might have changed it
+                $block = $selectbox.closest('.block');
+                $value = $block.find('.value');
+                // display:block overrides the hide-collapse rule
+                $value.css('display', '');
+              }
             },
-            vue: $dropdown.hasClass('js-issue-board-sidebar'),
-            clicked: function(user, $el, e) {
-              var isIssueIndex, isMRIndex, page, selected, isSelecting;
+            multiSelect: $dropdown.hasClass('js-multiselect'),
+            inputMeta: $dropdown.data('input-meta'),
+            clicked: function(options) {
+              const { $el, e, isMarking } = options;
+              const user = options.selectedObj;
+
+              if ($dropdown.hasClass('js-multiselect')) {
+                const isActive = $el.hasClass('is-active');
+                const previouslySelected = $dropdown.closest('.selectbox')
+                    .find("input[name='" + ($dropdown.data('field-name')) + "'][value!=0]");
+
+                // Enables support for limiting the number of users selected
+                // Automatically removes the first on the list if more users are selected
+                checkMaxSelect();
+
+                if (user.beforeDivider && user.name.toLowerCase() === 'unassigned') {
+                  // Unassigned selected
+                  previouslySelected.each((index, element) => {
+                    const id = parseInt(element.value, 10);
+                    element.remove();
+                  });
+                  eventHub.$emit('sidebar.removeAllAssignees');
+                } else if (isActive) {
+                  // user selected
+                  eventHub.$emit('sidebar.addAssignee', user);
+
+                  // Remove unassigned selection (if it was previously selected)
+                  const unassignedSelected = $dropdown.closest('.selectbox')
+                    .find("input[name='" + ($dropdown.data('field-name')) + "'][value=0]");
+
+                  if (unassignedSelected) {
+                    unassignedSelected.remove();
+                  }
+                } else {
+                  if (previouslySelected.length === 0) {
+                  // Select unassigned because there is no more selected users
+                    this.addInput($dropdown.data('field-name'), 0, {});
+                  }
+
+                  // User unselected
+                  eventHub.$emit('sidebar.removeAssignee', user);
+                }
+
+                if (getSelected().find(u => u === gon.current_user_id)) {
+                  $('.assign-to-me-link').hide();
+                } else {
+                  $('.assign-to-me-link').show();
+                }
+              }
+
+              var isIssueIndex, isMRIndex, page, selected;
               page = $('body').data('page');
               isIssueIndex = page === 'projects:issues:index';
               isMRIndex = (page === page && page === 'projects:merge_requests:index');
-              isSelecting = (user.id !== selectedId);
-              selectedId = isSelecting ? user.id : selectedIdDefault;
               if ($dropdown.hasClass('js-filter-bulk-update') || $dropdown.hasClass('js-issuable-form-dropdown')) {
                 e.preventDefault();
+
+                const isSelecting = (user.id !== selectedId);
+                selectedId = isSelecting ? user.id : selectedIdDefault;
+
                 if (selectedId === gon.current_user_id) {
                   $('.assign-to-me-link').hide();
                 } else {
@@ -229,20 +416,7 @@
                 return Issuable.filterResults($dropdown.closest('form'));
               } else if ($dropdown.hasClass('js-filter-submit')) {
                 return $dropdown.closest('form').submit();
-              } else if ($dropdown.hasClass('js-issue-board-sidebar')) {
-                if (user.id && isSelecting) {
-                  gl.issueBoards.boardStoreIssueSet('assignee', new ListUser({
-                    id: user.id,
-                    username: user.username,
-                    name: user.name,
-                    avatar_url: user.avatar_url
-                  }));
-                } else {
-                  gl.issueBoards.boardStoreIssueDelete('assignee');
-                }
-
-                updateIssueBoardsIssue();
-              } else {
+              } else if (!$dropdown.hasClass('js-multiselect')) {
                 selected = $dropdown.closest('.selectbox').find("input[name='" + ($dropdown.data('field-name')) + "']").val();
                 return assignTo(selected);
               }
@@ -256,29 +430,54 @@
                 selectedId = parseInt($dropdown[0].dataset.selected, 10) || selectedIdDefault;
               }
               $el.find('.is-active').removeClass('is-active');
-              $el.find(`li[data-user-id="${selectedId}"] .dropdown-menu-user-link`).addClass('is-active');
+
+              function highlightSelected(id) {
+                $el.find(`li[data-user-id="${id}"] .dropdown-menu-user-link`).addClass('is-active');
+              }
+
+              if ($selectbox[0]) {
+                getSelected().forEach(selectedId => highlightSelected(selectedId));
+              } else {
+                highlightSelected(selectedId);
+              }
             },
+            updateLabel: $dropdown.data('dropdown-title'),
             renderRow: function(user) {
-              var avatar, img, listClosingTags, listWithName, listWithUserName, selected, username;
+              var avatar, img, listClosingTags, listWithName, listWithUserName, username;
               username = user.username ? "@" + user.username : "";
               avatar = user.avatar_url ? user.avatar_url : false;
-              selected = user.id === parseInt(selectedId, 10) ? "is-active" : "";
+
+              let selected = user.id === parseInt(selectedId, 10);
+
+              if (this.multiSelect) {
+                const fieldName = this.fieldName;
+                const field = $dropdown.closest('.selectbox').find("input[name='" + fieldName + "'][value='" + user.id + "']");
+
+                if (field.length) {
+                  selected = true;
+                }
+              }
+
               img = "";
               if (user.beforeDivider != null) {
-                "<li> <a href='#' class='" + selected + "'> " + user.name + " </a> </li>";
+                `<li><a href='#' class='${selected === true ? 'is-active' : ''}'>${user.name}</a></li>`;
               } else {
                 if (avatar) {
-                  img = "<img src='" + avatar + "' class='avatar avatar-inline' width='30' />";
+                  img = "<img src='" + avatar + "' class='avatar avatar-inline' width='32' />";
                 }
               }
-              // split into three parts so we can remove the username section if nessesary
-              listWithName = "<li data-user-id=" + user.id + "> <a href='#' class='dropdown-menu-user-link " + selected + "'> " + img + " <strong class='dropdown-menu-user-full-name'> " + user.name + " </strong>";
-              listWithUserName = "<span class='dropdown-menu-user-username'> " + username + " </span>";
-              listClosingTags = "</a> </li>";
-              if (username === '') {
-                listWithUserName = '';
-              }
-              return listWithName + listWithUserName + listClosingTags;
+
+              return `
+                <li data-user-id=${user.id}>
+                  <a href='#' class='dropdown-menu-user-link ${selected === true ? 'is-active' : ''}'>
+                    ${img}
+                    <strong class='dropdown-menu-user-full-name'>
+                      ${user.name}
+                    </strong>
+                    ${username ? `<span class='dropdown-menu-user-username'>${username}</span>` : ''}
+                  </a>
+                </li>
+              `;
             }
           });
         };
diff --git a/app/assets/stylesheets/framework/avatar.scss b/app/assets/stylesheets/framework/avatar.scss
index 3f5b78ed445..91c1ebd5a7d 100644
--- a/app/assets/stylesheets/framework/avatar.scss
+++ b/app/assets/stylesheets/framework/avatar.scss
@@ -93,3 +93,14 @@
     align-self: center;
   }
 }
+
+.avatar-counter {
+  background-color: $gray-darkest;
+  color: $white-light;
+  border: 1px solid $border-color;
+  border-radius: 1em;
+  font-family: $regular_font;
+  font-size: 9px;
+  line-height: 16px;
+  text-align: center;
+}
diff --git a/app/assets/stylesheets/framework/dropdowns.scss b/app/assets/stylesheets/framework/dropdowns.scss
index 73ded9f30d4..5c9b71a452c 100644
--- a/app/assets/stylesheets/framework/dropdowns.scss
+++ b/app/assets/stylesheets/framework/dropdowns.scss
@@ -251,14 +251,16 @@
   }
 
   .dropdown-header {
-    color: $gl-text-color;
+    color: $gl-text-color-secondary;
     font-size: 13px;
-    font-weight: 600;
     line-height: 22px;
-    text-transform: capitalize;
     padding: 0 16px;
   }
 
+  &.capitalize-header .dropdown-header {
+    text-transform: capitalize;
+  }
+
   .separator + .dropdown-header {
     padding-top: 2px;
   }
@@ -337,8 +339,8 @@
 .dropdown-menu-user {
   .avatar {
     float: left;
-    width: 30px;
-    height: 30px;
+    width: 2 * $gl-padding;
+    height: 2 * $gl-padding;
     margin: 0 10px 0 0;
   }
 }
@@ -381,6 +383,7 @@
 .dropdown-menu-selectable {
   a {
     padding-left: 26px;
+    position: relative;
 
     &.is-indeterminate,
     &.is-active {
@@ -406,6 +409,9 @@
 
     &.is-active::before {
       content: "\f00c";
+      position: absolute;
+      top: 50%;
+      transform: translateY(-50%);
     }
   }
 }
diff --git a/app/assets/stylesheets/framework/files.scss b/app/assets/stylesheets/framework/files.scss
index c197bf6b9f5..1dd0e5ab581 100644
--- a/app/assets/stylesheets/framework/files.scss
+++ b/app/assets/stylesheets/framework/files.scss
@@ -162,6 +162,18 @@
     &.code {
       padding: 0;
     }
+
+    .list-inline.previews {
+      display: flex;
+      flex-wrap: wrap;
+      justify-content: center;
+      align-content: flex-start;
+      align-items: baseline;
+
+      .preview {
+        padding: $gl-padding;
+      }
+    }
   }
 }
 
diff --git a/app/assets/stylesheets/framework/filters.scss b/app/assets/stylesheets/framework/filters.scss
index 0692f65043b..e624d0d951e 100644
--- a/app/assets/stylesheets/framework/filters.scss
+++ b/app/assets/stylesheets/framework/filters.scss
@@ -114,11 +114,21 @@
     padding-right: 8px;
 
     .fa-close {
-      color: $gl-text-color-disabled;
+      color: $gl-text-color-secondary;
     }
 
     &:hover .fa-close {
-      color: $gl-text-color-secondary;
+      color: $gl-text-color;
+    }
+
+    &.inverted {
+      .fa-close {
+        color: $gl-text-color-secondary-inverted;
+      }
+
+      &:hover .fa-close {
+        color: $gl-text-color-inverted;
+      }
     }
   }
 
diff --git a/app/assets/stylesheets/framework/lists.scss b/app/assets/stylesheets/framework/lists.scss
index 15dc0aa6a52..c9a25946ffd 100644
--- a/app/assets/stylesheets/framework/lists.scss
+++ b/app/assets/stylesheets/framework/lists.scss
@@ -255,6 +255,7 @@ ul.controls {
       .avatar-inline {
         margin-left: 0;
         margin-right: 0;
+        margin-bottom: 0;
       }
     }
   }
diff --git a/app/assets/stylesheets/framework/variables.scss b/app/assets/stylesheets/framework/variables.scss
index 49741c963df..08bcb582613 100644
--- a/app/assets/stylesheets/framework/variables.scss
+++ b/app/assets/stylesheets/framework/variables.scss
@@ -101,6 +101,8 @@ $gl-font-size: 14px;
 $gl-text-color: rgba(0, 0, 0, .85);
 $gl-text-color-secondary: rgba(0, 0, 0, .55);
 $gl-text-color-disabled: rgba(0, 0, 0, .35);
+$gl-text-color-inverted: rgba(255, 255, 255, 1.0);
+$gl-text-color-secondary-inverted: rgba(255, 255, 255, .85);
 $gl-text-green: $green-600;
 $gl-text-red: $red-500;
 $gl-text-orange: $orange-600;
diff --git a/app/assets/stylesheets/pages/boards.scss b/app/assets/stylesheets/pages/boards.scss
index 0be1c215959..68d7ab4bf84 100644
--- a/app/assets/stylesheets/pages/boards.scss
+++ b/app/assets/stylesheets/pages/boards.scss
@@ -207,8 +207,13 @@
     margin-bottom: 5px;
   }
 
-  &.is-active {
+  &.is-active,
+  &.is-active .card-assignee:hover a {
     background-color: $row-hover;
+
+    &:first-child:not(:only-child) {
+      box-shadow: -10px 0 10px 1px $row-hover;
+    }
   }
 
   .label {
@@ -224,7 +229,7 @@
 }
 
 .card-title {
-  margin: 0;
+  margin: 0 30px 0 0;
   font-size: 1em;
   line-height: inherit;
 
@@ -240,10 +245,69 @@
   min-height: 20px;
 
   .card-assignee {
-    margin-left: auto;
-    margin-right: 5px;
-    padding-left: 10px;
+    display: flex;
+    justify-content: flex-end;
+    position: absolute;
+    right: 15px;
     height: 20px;
+    width: 20px;
+
+    .avatar-counter {
+      display: none;
+      vertical-align: middle;
+      min-width: 20px;
+      line-height: 19px;
+      height: 20px;
+      padding-left: 2px;
+      padding-right: 2px;
+      border-radius: 2em;
+    }
+
+    img {
+      vertical-align: top;
+    }
+
+    a {
+      position: relative;
+      margin-left: -15px;
+    }
+
+    a:nth-child(1) {
+      z-index: 3;
+    }
+
+    a:nth-child(2) {
+      z-index: 2;
+    }
+
+    a:nth-child(3) {
+      z-index: 1;
+    }
+
+    a:nth-child(4) {
+      display: none;
+    }
+
+    &:hover {
+      .avatar-counter {
+        display: inline-block;
+      }
+
+      a {
+        position: static;
+        background-color: $white-light;
+        transition: background-color 0s;
+        margin-left: auto;
+
+        &:nth-child(4) {
+          display: block;
+        }
+
+        &:first-child:not(:only-child) {
+          box-shadow: -10px 0 10px 1px $white-light;
+        }
+      }
+    }
   }
 
   .avatar {
diff --git a/app/assets/stylesheets/pages/cycle_analytics.scss b/app/assets/stylesheets/pages/cycle_analytics.scss
index 52bbb753af3..d29944207c5 100644
--- a/app/assets/stylesheets/pages/cycle_analytics.scss
+++ b/app/assets/stylesheets/pages/cycle_analytics.scss
@@ -3,6 +3,25 @@
   margin: 24px auto 0;
   position: relative;
 
+  .landing {
+    margin-top: 10px;
+
+    .inner-content {
+      white-space: normal;
+
+      h4,
+      p {
+        margin: 7px 0 0;
+        max-width: 480px;
+        padding: 0 $gl-padding;
+
+        @media (max-width: $screen-sm-min) {
+          margin: 0 auto;
+        }
+      }
+    }
+  }
+
   .col-headers {
     ul {
       margin: 0;
diff --git a/app/assets/stylesheets/pages/diff.scss b/app/assets/stylesheets/pages/diff.scss
index feefaad8a15..77f2638683a 100644
--- a/app/assets/stylesheets/pages/diff.scss
+++ b/app/assets/stylesheets/pages/diff.scss
@@ -570,14 +570,7 @@
 
 .diff-comments-more-count,
 .diff-notes-collapse {
-  background-color: $gray-darkest;
-  color: $white-light;
-  border: 1px solid $white-light;
-  border-radius: 1em;
-  font-family: $regular_font;
-  font-size: 9px;
-  line-height: 17px;
-  text-align: center;
+  @extend .avatar-counter;
 }
 
 .diff-notes-collapse {
diff --git a/app/assets/stylesheets/pages/issuable.scss b/app/assets/stylesheets/pages/issuable.scss
index ad6eb9f6fe0..c4210ffd823 100644
--- a/app/assets/stylesheets/pages/issuable.scss
+++ b/app/assets/stylesheets/pages/issuable.scss
@@ -95,10 +95,15 @@
 }
 
 .right-sidebar {
-  a {
+  a,
+  .btn-link {
     color: inherit;
   }
 
+  .btn-link {
+    outline: none;
+  }
+
   .issuable-header-text {
     margin-top: 7px;
   }
@@ -215,6 +220,10 @@
       }
     }
 
+    .assign-yourself .btn-link {
+      padding-left: 0;
+    }
+
     .light {
       font-weight: normal;
     }
@@ -239,6 +248,10 @@
       margin-left: 0;
     }
 
+    .assignee .user-list .avatar {
+      margin: 0;
+    }
+
     .username {
       display: block;
       margin-top: 4px;
@@ -301,6 +314,10 @@
         margin-top: 0;
       }
 
+      .sidebar-avatar-counter {
+        padding-top: 2px;
+      }
+
       .todo-undone {
         color: $gl-link-color;
       }
@@ -309,10 +326,15 @@
         display: none;
       }
 
-      .avatar:hover {
+      .avatar:hover,
+      .avatar-counter:hover {
         border-color: $issuable-sidebar-color;
       }
 
+      .avatar-counter:hover {
+        color: $issuable-sidebar-color;
+      }
+
       .btn-clipboard {
         border: none;
         color: $issuable-sidebar-color;
@@ -322,6 +344,17 @@
           color: $gl-text-color;
         }
       }
+
+      &.multiple-users {
+        display: flex;
+        justify-content: center;
+      }
+    }
+
+    .sidebar-avatar-counter {
+      width: 24px;
+      height: 24px;
+      border-radius: 12px;
     }
 
     .sidebar-collapsed-user {
@@ -332,6 +365,37 @@
     .issuable-header-btn {
       display: none;
     }
+
+    .multiple-users {
+      height: 24px;
+      margin-bottom: 17px;
+      margin-top: 4px;
+      padding-bottom: 4px;
+
+      .btn-link {
+        padding: 0;
+        border: 0;
+
+        .avatar {
+          margin: 0;
+        }
+      }
+
+      .btn-link:first-child {
+        position: absolute;
+        left: 10px;
+        z-index: 1;
+      }
+
+      .btn-link:last-child {
+        position: absolute;
+        right: 10px;
+
+        &:hover {
+          text-decoration: none;
+        }
+      }
+    }
   }
 
   a {
@@ -383,6 +447,12 @@
   margin: -5px;
 }
 
+
+.user-list {
+  display: flex;
+  flex-wrap: wrap;
+}
+
 .participants-author {
   display: inline-block;
   padding: 5px;
@@ -400,13 +470,39 @@
   }
 }
 
-.participants-more {
+.user-item {
+  display: inline-block;
+  padding: 5px;
+  flex-basis: 20%;
+
+  .user-link {
+    display: inline-block;
+  }
+}
+
+.participants-more,
+.user-list-more {
   margin-top: 5px;
   margin-left: 5px;
 
-  a {
+  a,
+  .btn-link {
     color: $gl-text-color-secondary;
   }
+
+  .btn-link {
+    outline: none;
+    padding: 0;
+  }
+
+  .btn-link:hover {
+    @extend a:hover;
+    text-decoration: none;
+  }
+
+  .btn-link:focus {
+    text-decoration: none;
+  }
 }
 
 .issuable-form-padding-top {
@@ -499,6 +595,19 @@
   }
 }
 
+.issuable-list li,
+.issue-info-container .controls {
+  .avatar-counter {
+    display: inline-block;
+    vertical-align: middle;
+    min-width: 16px;
+    line-height: 14px;
+    height: 16px;
+    padding-left: 2px;
+    padding-right: 2px;
+  }
+}
+
 .time_tracker {
   padding-bottom: 0;
   border-bottom: 0;
diff --git a/app/assets/stylesheets/pages/issues.scss b/app/assets/stylesheets/pages/issues.scss
index b18bbc329c3..ad3b6e0344b 100644
--- a/app/assets/stylesheets/pages/issues.scss
+++ b/app/assets/stylesheets/pages/issues.scss
@@ -18,6 +18,15 @@
   }
 }
 
+.issue-realtime-pre-pulse {
+  opacity: 0;
+}
+
+.issue-realtime-trigger-pulse {
+  transition: opacity $fade-in-duration linear;
+  opacity: 1;
+}
+
 .check-all-holder {
   line-height: 36px;
   float: left;
diff --git a/app/assets/stylesheets/pages/labels.scss b/app/assets/stylesheets/pages/labels.scss
index e1ef0b029a5..c10588ac58e 100644
--- a/app/assets/stylesheets/pages/labels.scss
+++ b/app/assets/stylesheets/pages/labels.scss
@@ -116,7 +116,7 @@
 }
 
 .manage-labels-list {
-  > li:not(.empty-message) {
+  > li:not(.empty-message):not(.is-not-draggable) {
     background-color: $white-light;
     cursor: move;
     cursor: -webkit-grab;
diff --git a/app/assets/stylesheets/pages/notes.scss b/app/assets/stylesheets/pages/notes.scss
index cfea52c6e57..69c328d09ff 100644
--- a/app/assets/stylesheets/pages/notes.scss
+++ b/app/assets/stylesheets/pages/notes.scss
@@ -130,12 +130,6 @@ ul.notes {
     }
 
     .note-header {
-      padding-bottom: 8px;
-      padding-right: 20px;
-
-      @media (min-width: $screen-sm-min) {
-        padding-right: 0;
-      }
 
       @media (max-width: $screen-xs-min) {
         .inline {
@@ -384,10 +378,15 @@ ul.notes {
 .note-header {
   display: flex;
   justify-content: space-between;
+
+  @media (max-width: $screen-xs-max) {
+    flex-flow: row wrap;
+  }
 }
 
 .note-header-info {
   min-width: 0;
+  padding-bottom: 5px;
 }
 
 .note-headline-light {
@@ -435,6 +434,11 @@ ul.notes {
   margin-left: 10px;
   color: $gray-darkest;
 
+  @media (max-width: $screen-xs-max) {
+    float: none;
+    margin-left: 0;
+  }
+
   .note-action-button {
     margin-left: 8px;
   }
diff --git a/app/assets/stylesheets/pages/pipelines.scss b/app/assets/stylesheets/pages/pipelines.scss
index 9115d26c779..530a6f3c6a1 100644
--- a/app/assets/stylesheets/pages/pipelines.scss
+++ b/app/assets/stylesheets/pages/pipelines.scss
@@ -273,6 +273,7 @@
   .stage-container {
     display: inline-block;
     position: relative;
+    vertical-align: middle;
     height: 22px;
     margin: 3px 6px 3px 0;
 
@@ -316,6 +317,32 @@
   }
 }
 
+.build-failures {
+  .build-state {
+    padding: 20px 2px;
+
+    .build-name {
+      float: right;
+      font-weight: 500;
+    }
+
+    .ci-status-icon-failed svg {
+      vertical-align: middle;
+    }
+
+    .stage {
+      color: $gl-text-color-secondary;
+      font-weight: 500;
+      vertical-align: middle;
+    }
+  }
+
+  .build-log {
+    border: none;
+    line-height: initial;
+  }
+}
+
 // Pipeline graph
 .pipeline-graph {
   width: 100%;
diff --git a/app/assets/stylesheets/pages/todos.scss b/app/assets/stylesheets/pages/todos.scss
index a39815319f3..de652a79369 100644
--- a/app/assets/stylesheets/pages/todos.scss
+++ b/app/assets/stylesheets/pages/todos.scss
@@ -54,8 +54,9 @@
     background-color: $white-light;
 
     &:hover {
-      border-color: $white-dark;
+      border-color: $white-normal;
       background-color: $gray-light;
+      border-top: 1px solid transparent;
 
       .todo-avatar,
       .todo-item {
diff --git a/app/controllers/admin/application_settings_controller.rb b/app/controllers/admin/application_settings_controller.rb
index 643993d035e..152d7baad49 100644
--- a/app/controllers/admin/application_settings_controller.rb
+++ b/app/controllers/admin/application_settings_controller.rb
@@ -133,6 +133,8 @@ class Admin::ApplicationSettingsController < Admin::ApplicationController
       :signup_enabled,
       :sentry_dsn,
       :sentry_enabled,
+      :clientside_sentry_dsn,
+      :clientside_sentry_enabled,
       :send_user_confirmation_email,
       :shared_runners_enabled,
       :shared_runners_text,
diff --git a/app/controllers/admin/services_controller.rb b/app/controllers/admin/services_controller.rb
index 37a1a23178e..4c3d336b3af 100644
--- a/app/controllers/admin/services_controller.rb
+++ b/app/controllers/admin/services_controller.rb
@@ -16,6 +16,8 @@ class Admin::ServicesController < Admin::ApplicationController
 
   def update
     if service.update_attributes(service_params[:service])
+      PropagateServiceTemplateWorker.perform_async(service.id) if service.active?
+
       redirect_to admin_application_settings_services_path,
         notice: 'Application settings saved successfully'
     else
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index d2c13da6917..65a1f640a76 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -58,7 +58,7 @@ class ApplicationController < ActionController::Base
     if current_user
       not_found
     else
-      redirect_to new_user_session_path
+      authenticate_user!
     end
   end
 
diff --git a/app/controllers/concerns/issuable_actions.rb b/app/controllers/concerns/issuable_actions.rb
index 3ccf2a9ce33..b199f18da1e 100644
--- a/app/controllers/concerns/issuable_actions.rb
+++ b/app/controllers/concerns/issuable_actions.rb
@@ -66,6 +66,7 @@ module IssuableActions
       :milestone_id,
       :state_event,
       :subscription_event,
+      assignee_ids: [],
       label_ids: [],
       add_label_ids: [],
       remove_label_ids: []
diff --git a/app/controllers/concerns/issuable_collections.rb b/app/controllers/concerns/issuable_collections.rb
index c8a501d7319..6df2c068745 100644
--- a/app/controllers/concerns/issuable_collections.rb
+++ b/app/controllers/concerns/issuable_collections.rb
@@ -43,7 +43,7 @@ module IssuableCollections
   end
 
   def issues_collection
-    issues_finder.execute.preload(:project, :author, :assignee, :labels, :milestone, project: :namespace)
+    issues_finder.execute.preload(:project, :author, :assignees, :labels, :milestone, project: :namespace)
   end
 
   def merge_requests_collection
diff --git a/app/controllers/concerns/notes_actions.rb b/app/controllers/concerns/notes_actions.rb
index c32038d07bf..a57d9e6e6c0 100644
--- a/app/controllers/concerns/notes_actions.rb
+++ b/app/controllers/concerns/notes_actions.rb
@@ -65,6 +65,15 @@ module NotesActions
 
   private
 
+  def note_html(note)
+    render_to_string(
+      "shared/notes/_note",
+      layout: false,
+      formats: [:html],
+      locals: { note: note }
+    )
+  end
+
   def note_json(note)
     attrs = {
       commands_changes: note.commands_changes
@@ -98,6 +107,41 @@ module NotesActions
     attrs
   end
 
+  def diff_discussion_html(discussion)
+    return unless discussion.diff_discussion?
+
+    if params[:view] == 'parallel'
+      template = "discussions/_parallel_diff_discussion"
+      locals =
+        if params[:line_type] == 'old'
+          { discussions_left: [discussion], discussions_right: nil }
+        else
+          { discussions_left: nil, discussions_right: [discussion] }
+        end
+    else
+      template = "discussions/_diff_discussion"
+      locals = { discussions: [discussion] }
+    end
+
+    render_to_string(
+      template,
+      layout: false,
+      formats: [:html],
+      locals: locals
+    )
+  end
+
+  def discussion_html(discussion)
+    return if discussion.individual_note?
+
+    render_to_string(
+      "discussions/_discussion",
+      layout: false,
+      formats: [:html],
+      locals: { discussion: discussion }
+    )
+  end
+
   def authorize_admin_note!
     return access_denied! unless can?(current_user, :admin_note, note)
   end
diff --git a/app/controllers/concerns/routable_actions.rb b/app/controllers/concerns/routable_actions.rb
new file mode 100644
index 00000000000..d4ab6782444
--- /dev/null
+++ b/app/controllers/concerns/routable_actions.rb
@@ -0,0 +1,38 @@
+module RoutableActions
+  extend ActiveSupport::Concern
+
+  def find_routable!(routable_klass, requested_full_path, extra_authorization_proc: nil)
+    routable = routable_klass.find_by_full_path(requested_full_path, follow_redirects: request.get?)
+
+    if routable_authorized?(routable_klass, routable, extra_authorization_proc)
+      ensure_canonical_path(routable, requested_full_path)
+      routable
+    else
+      route_not_found
+      nil
+    end
+  end
+
+  def routable_authorized?(routable_klass, routable, extra_authorization_proc)
+    action = :"read_#{routable_klass.to_s.underscore}"
+    return false unless can?(current_user, action, routable)
+
+    if extra_authorization_proc
+      extra_authorization_proc.call(routable)
+    else
+      true
+    end
+  end
+
+  def ensure_canonical_path(routable, requested_path)
+    return unless request.get?
+
+    canonical_path = routable.full_path
+    if canonical_path != requested_path
+      if canonical_path.casecmp(requested_path) != 0
+        flash[:notice] = "Project '#{requested_path}' was moved to '#{canonical_path}'. Please update any links and bookmarks that may still have the old path."
+      end
+      redirect_to request.original_url.sub(requested_path, canonical_path)
+    end
+  end
+end
diff --git a/app/controllers/dashboard/labels_controller.rb b/app/controllers/dashboard/labels_controller.rb
index d5031da867a..dd1d46a68c7 100644
--- a/app/controllers/dashboard/labels_controller.rb
+++ b/app/controllers/dashboard/labels_controller.rb
@@ -3,7 +3,7 @@ class Dashboard::LabelsController < Dashboard::ApplicationController
     labels = LabelsFinder.new(current_user).execute
 
     respond_to do |format|
-      format.json { render json: labels.as_json(only: [:id, :title, :color]) }
+      format.json { render json: LabelSerializer.new.represent_appearance(labels) }
     end
   end
 end
diff --git a/app/controllers/groups/application_controller.rb b/app/controllers/groups/application_controller.rb
index 29ffaeb19c1..afffb813b44 100644
--- a/app/controllers/groups/application_controller.rb
+++ b/app/controllers/groups/application_controller.rb
@@ -1,4 +1,6 @@
 class Groups::ApplicationController < ApplicationController
+  include RoutableActions
+
   layout 'group'
 
   skip_before_action :authenticate_user!
@@ -7,29 +9,17 @@ class Groups::ApplicationController < ApplicationController
   private
 
   def group
-    unless @group
-      id = params[:group_id] || params[:id]
-      @group = Group.find_by_full_path(id)
-      @group_merge_requests = MergeRequestsFinder.new(current_user, group_id: @group.id).execute
-
-      unless @group && can?(current_user, :read_group, @group)
-        @group = nil
-
-        if current_user.nil?
-          authenticate_user!
-        else
-          render_404
-        end
-      end
-    end
-
-    @group
+    @group ||= find_routable!(Group, params[:group_id] || params[:id])
   end
 
   def group_projects
     @projects ||= GroupProjectsFinder.new(group: group, current_user: current_user).execute
   end
 
+  def group_merge_requests
+    @group_merge_requests = MergeRequestsFinder.new(current_user, group_id: @group.id).execute
+  end
+
   def authorize_admin_group!
     unless can?(current_user, :admin_group, group)
       return render_404
diff --git a/app/controllers/groups/labels_controller.rb b/app/controllers/groups/labels_controller.rb
index facb25525b5..3fa0516fb0c 100644
--- a/app/controllers/groups/labels_controller.rb
+++ b/app/controllers/groups/labels_controller.rb
@@ -15,7 +15,7 @@ class Groups::LabelsController < Groups::ApplicationController
 
       format.json do
         available_labels = LabelsFinder.new(current_user, group_id: @group.id).execute
-        render json: available_labels.as_json(only: [:id, :title, :color])
+        render json: LabelSerializer.new.represent_appearance(available_labels)
       end
     end
   end
diff --git a/app/controllers/groups_controller.rb b/app/controllers/groups_controller.rb
index 593001e6396..46c3ff10694 100644
--- a/app/controllers/groups_controller.rb
+++ b/app/controllers/groups_controller.rb
@@ -12,8 +12,8 @@ class GroupsController < Groups::ApplicationController
   before_action :authorize_admin_group!, only: [:edit, :update, :destroy, :projects]
   before_action :authorize_create_group!, only: [:new, :create]
 
-  # Load group projects
   before_action :group_projects, only: [:projects, :activity, :issues, :merge_requests]
+  before_action :group_merge_requests, only: [:merge_requests]
   before_action :event_filter, only: [:activity]
 
   before_action :user_actions, only: [:show, :subgroups]
diff --git a/app/controllers/projects/application_controller.rb b/app/controllers/projects/application_controller.rb
index 89f1128ec36..b4b0dfc3eb8 100644
--- a/app/controllers/projects/application_controller.rb
+++ b/app/controllers/projects/application_controller.rb
@@ -1,5 +1,8 @@
 class Projects::ApplicationController < ApplicationController
+  include RoutableActions
+
   skip_before_action :authenticate_user!
+  before_action :redirect_git_extension
   before_action :project
   before_action :repository
   layout 'project'
@@ -8,40 +11,22 @@ class Projects::ApplicationController < ApplicationController
 
   private
 
+  def redirect_git_extension
+    # Redirect from
+    #   localhost/group/project.git
+    # to
+    #   localhost/group/project
+    #
+    redirect_to url_for(params.merge(format: nil)) if params[:format] == 'git'
+  end
+
   def project
-    unless @project
-      namespace = params[:namespace_id]
-      id = params[:project_id] || params[:id]
-
-      # Redirect from
-      #   localhost/group/project.git
-      # to
-      #   localhost/group/project
-      #
-      if params[:format] == 'git'
-        redirect_to request.original_url.gsub(/\.git\/?\Z/, '')
-        return
-      end
-
-      project_path = "#{namespace}/#{id}"
-      @project = Project.find_by_full_path(project_path)
-
-      if can?(current_user, :read_project, @project) && !@project.pending_delete?
-        if @project.path_with_namespace != project_path
-          redirect_to request.original_url.gsub(project_path, @project.path_with_namespace)
-        end
-      else
-        @project = nil
-
-        if current_user.nil?
-          authenticate_user!
-        else
-          render_404
-        end
-      end
-    end
+    return @project if @project
+
+    path = File.join(params[:namespace_id], params[:project_id] || params[:id])
+    auth_proc = ->(project) { !project.pending_delete? }
 
-    @project
+    @project = find_routable!(Project, path, extra_authorization_proc: auth_proc)
   end
 
   def repository
diff --git a/app/controllers/projects/boards/issues_controller.rb b/app/controllers/projects/boards/issues_controller.rb
index 28c9646910d..da9b789d617 100644
--- a/app/controllers/projects/boards/issues_controller.rb
+++ b/app/controllers/projects/boards/issues_controller.rb
@@ -82,7 +82,7 @@ module Projects
           labels: true,
           only: [:id, :iid, :title, :confidential, :due_date, :relative_position],
           include: {
-            assignee: { only: [:id, :name, :username], methods: [:avatar_url] },
+            assignees: { only: [:id, :name, :username], methods: [:avatar_url] },
             milestone: { only: [:id, :title] }
           },
           user: current_user
diff --git a/app/controllers/projects/git_http_controller.rb b/app/controllers/projects/git_http_controller.rb
index 10adddb4636..9e4edcae101 100644
--- a/app/controllers/projects/git_http_controller.rb
+++ b/app/controllers/projects/git_http_controller.rb
@@ -59,7 +59,7 @@ class Projects::GitHttpController < Projects::GitHttpClientController
 
   def render_ok
     set_workhorse_internal_api_content_type
-    render json: Gitlab::Workhorse.git_http_ok(repository, user, action_name)
+    render json: Gitlab::Workhorse.git_http_ok(repository, wiki?, user, action_name)
   end
 
   def render_http_not_allowed
diff --git a/app/controllers/projects/issues_controller.rb b/app/controllers/projects/issues_controller.rb
index af9157bfbb5..bcd23d61519 100644
--- a/app/controllers/projects/issues_controller.rb
+++ b/app/controllers/projects/issues_controller.rb
@@ -67,7 +67,7 @@ class Projects::IssuesController < Projects::ApplicationController
 
   def new
     params[:issue] ||= ActionController::Parameters.new(
-      assignee_id: ""
+      assignee_ids: ""
     )
     build_params = issue_params.merge(
       merge_request_to_resolve_discussions_of: params[:merge_request_to_resolve_discussions_of],
@@ -150,7 +150,7 @@ class Projects::IssuesController < Projects::ApplicationController
         if @issue.valid?
           render json: @issue.to_json(methods: [:task_status, :task_status_short],
                                       include: { milestone: {},
-                                                 assignee: { only: [:name, :username], methods: [:avatar_url] },
+                                                 assignees: { only: [:id, :name, :username], methods: [:avatar_url] },
                                                  labels: { methods: :text_color } })
         else
           render json: { errors: @issue.errors.full_messages }, status: :unprocessable_entity
@@ -201,7 +201,16 @@ class Projects::IssuesController < Projects::ApplicationController
 
   def rendered_title
     Gitlab::PollingInterval.set_header(response, interval: 3_000)
-    render json: { title: view_context.markdown_field(@issue, :title) }
+
+    render json: {
+      title: view_context.markdown_field(@issue, :title),
+      title_text: @issue.title,
+      description: view_context.markdown_field(@issue, :description),
+      description_text: @issue.description,
+      task_status: @issue.task_status,
+      issue_number: @issue.iid,
+      updated_at: @issue.updated_at,
+    }
   end
 
   def create_merge_request
@@ -275,7 +284,7 @@ class Projects::IssuesController < Projects::ApplicationController
   def issue_params
     params.require(:issue).permit(
       :title, :assignee_id, :position, :description, :confidential,
-      :milestone_id, :due_date, :state_event, :task_num, :lock_version, label_ids: []
+      :milestone_id, :due_date, :state_event, :task_num, :lock_version, label_ids: [], assignee_ids: [],
     )
   end
 
diff --git a/app/controllers/projects/labels_controller.rb b/app/controllers/projects/labels_controller.rb
index 2f55ba4e700..71bfb7163da 100644
--- a/app/controllers/projects/labels_controller.rb
+++ b/app/controllers/projects/labels_controller.rb
@@ -19,7 +19,7 @@ class Projects::LabelsController < Projects::ApplicationController
     respond_to do |format|
       format.html
       format.json do
-        render json: @available_labels.as_json(only: [:id, :title, :color])
+        render json: LabelSerializer.new.represent_appearance(@available_labels)
       end
     end
   end
diff --git a/app/controllers/projects/notes_controller.rb b/app/controllers/projects/notes_controller.rb
index 37f51b2ebe3..41a13f6f577 100644
--- a/app/controllers/projects/notes_controller.rb
+++ b/app/controllers/projects/notes_controller.rb
@@ -62,50 +62,6 @@ class Projects::NotesController < Projects::ApplicationController
   end
   alias_method :awardable, :note
 
-  def note_html(note)
-    render_to_string(
-      "shared/notes/_note",
-      layout: false,
-      formats: [:html],
-      locals: { note: note }
-    )
-  end
-
-  def discussion_html(discussion)
-    return if discussion.individual_note?
-
-    render_to_string(
-      "discussions/_discussion",
-      layout: false,
-      formats: [:html],
-      locals: { discussion: discussion }
-    )
-  end
-
-  def diff_discussion_html(discussion)
-    return unless discussion.diff_discussion?
-
-    if params[:view] == 'parallel'
-      template = "discussions/_parallel_diff_discussion"
-      locals =
-        if params[:line_type] == 'old'
-          { discussions_left: [discussion], discussions_right: nil }
-        else
-          { discussions_left: nil, discussions_right: [discussion] }
-        end
-    else
-      template = "discussions/_diff_discussion"
-      locals = { discussions: [discussion] }
-    end
-
-    render_to_string(
-      template,
-      layout: false,
-      formats: [:html],
-      locals: locals
-    )
-  end
-
   def finder_params
     params.merge(last_fetched_at: last_fetched_at)
   end
diff --git a/app/controllers/projects/pipelines_controller.rb b/app/controllers/projects/pipelines_controller.rb
index 2908036607a..5cb2e428201 100644
--- a/app/controllers/projects/pipelines_controller.rb
+++ b/app/controllers/projects/pipelines_controller.rb
@@ -1,6 +1,6 @@
 class Projects::PipelinesController < Projects::ApplicationController
   before_action :pipeline, except: [:index, :new, :create, :charts]
-  before_action :commit, only: [:show, :builds]
+  before_action :commit, only: [:show, :builds, :failures]
   before_action :authorize_read_pipeline!
   before_action :authorize_create_pipeline!, only: [:new, :create]
   before_action :authorize_update_pipeline!, only: [:retry, :cancel]
@@ -8,6 +8,8 @@ class Projects::PipelinesController < Projects::ApplicationController
 
   wrap_parameters Ci::Pipeline
 
+  POLLING_INTERVAL = 10_000
+
   def index
     @scope = params[:scope]
     @pipelines = PipelinesFinder
@@ -31,7 +33,7 @@ class Projects::PipelinesController < Projects::ApplicationController
     respond_to do |format|
       format.html
       format.json do
-        Gitlab::PollingInterval.set_header(response, interval: 10_000)
+        Gitlab::PollingInterval.set_header(response, interval: POLLING_INTERVAL)
 
         render json: {
           pipelines: PipelineSerializer
@@ -57,22 +59,36 @@ class Projects::PipelinesController < Projects::ApplicationController
     @pipeline = Ci::CreatePipelineService
       .new(project, current_user, create_params)
       .execute(ignore_skip_ci: true, save_on_errors: false)
-    unless @pipeline.persisted?
+
+    if @pipeline.persisted?
+      redirect_to namespace_project_pipeline_path(project.namespace, project, @pipeline)
+    else
       render 'new'
-      return
     end
-
-    redirect_to namespace_project_pipeline_path(project.namespace, project, @pipeline)
   end
 
   def show
+    respond_to do |format|
+      format.html
+      format.json do
+        Gitlab::PollingInterval.set_header(response, interval: POLLING_INTERVAL)
+
+        render json: PipelineSerializer
+          .new(project: @project, user: @current_user)
+          .represent(@pipeline, grouped: true)
+      end
+    end
   end
 
   def builds
-    respond_to do |format|
-      format.html do
-        render 'show'
-      end
+    render_show
+  end
+
+  def failures
+    if @pipeline.statuses.latest.failed.present?
+      render_show
+    else
+      redirect_to pipeline_path(@pipeline)
     end
   end
 
@@ -125,6 +141,14 @@ class Projects::PipelinesController < Projects::ApplicationController
 
   private
 
+  def render_show
+    respond_to do |format|
+      format.html do
+        render 'show'
+      end
+    end
+  end
+
   def create_params
     params.require(:pipeline).permit(:ref)
   end
diff --git a/app/controllers/snippets/notes_controller.rb b/app/controllers/snippets/notes_controller.rb
index 3c4ddc1680d..f9496787b15 100644
--- a/app/controllers/snippets/notes_controller.rb
+++ b/app/controllers/snippets/notes_controller.rb
@@ -13,15 +13,6 @@ class Snippets::NotesController < ApplicationController
   end
   alias_method :awardable, :note
 
-  def note_html(note)
-    render_to_string(
-      "shared/notes/_note",
-      layout: false,
-      formats: [:html],
-      locals: { note: note }
-    )
-  end
-
   def project
     nil
   end
diff --git a/app/controllers/snippets_controller.rb b/app/controllers/snippets_controller.rb
index afed27a41d1..19e07e3ab86 100644
--- a/app/controllers/snippets_controller.rb
+++ b/app/controllers/snippets_controller.rb
@@ -64,6 +64,7 @@ class SnippetsController < ApplicationController
     blob = @snippet.blob
     override_max_blob_size(blob)
 
+    @note = Note.new(noteable: @snippet)
     @noteable = @snippet
 
     @discussions = @snippet.discussions
diff --git a/app/controllers/users_controller.rb b/app/controllers/users_controller.rb
index a452bbba422..ca89ed221c6 100644
--- a/app/controllers/users_controller.rb
+++ b/app/controllers/users_controller.rb
@@ -1,7 +1,8 @@
 class UsersController < ApplicationController
+  include RoutableActions
+
   skip_before_action :authenticate_user!
   before_action :user, except: [:exists]
-  before_action :authorize_read_user!, only: [:show]
 
   def show
     respond_to do |format|
@@ -91,12 +92,8 @@ class UsersController < ApplicationController
 
   private
 
-  def authorize_read_user!
-    render_404 unless can?(current_user, :read_user, user)
-  end
-
   def user
-    @user ||= User.find_by_username!(params[:username])
+    @user ||= find_routable!(User, params[:username])
   end
 
   def contributed_projects
diff --git a/app/finders/issuable_finder.rb b/app/finders/issuable_finder.rb
index 4cc42b88a2a..957ad875858 100644
--- a/app/finders/issuable_finder.rb
+++ b/app/finders/issuable_finder.rb
@@ -231,7 +231,7 @@ class IssuableFinder
     when 'created-by-me', 'authored'
       items.where(author_id: current_user.id)
     when 'assigned-to-me'
-      items.where(assignee_id: current_user.id)
+      items.assigned_to(current_user)
     else
       items
     end
diff --git a/app/finders/issues_finder.rb b/app/finders/issues_finder.rb
index 76715e5970d..b4c074bc69c 100644
--- a/app/finders/issues_finder.rb
+++ b/app/finders/issues_finder.rb
@@ -26,17 +26,28 @@ class IssuesFinder < IssuableFinder
     IssuesFinder.not_restricted_by_confidentiality(current_user)
   end
 
+  def by_assignee(items)
+    if assignee
+      items.assigned_to(assignee)
+    elsif no_assignee?
+      items.unassigned
+    elsif assignee_id? || assignee_username? # assignee not found
+      items.none
+    else
+      items
+    end
+  end
+
   def self.not_restricted_by_confidentiality(user)
-    return Issue.where('issues.confidential IS NULL OR issues.confidential IS FALSE') if user.blank?
+    return Issue.where('issues.confidential IS NOT TRUE') if user.blank?
 
     return Issue.all if user.admin?
 
     Issue.where('
-      issues.confidential IS NULL
-      OR issues.confidential IS FALSE
+      issues.confidential IS NOT TRUE
       OR (issues.confidential = TRUE
         AND (issues.author_id = :user_id
-          OR issues.assignee_id = :user_id
+          OR EXISTS (SELECT TRUE FROM issue_assignees WHERE user_id = :user_id AND issue_id = issues.id)
           OR issues.project_id IN(:project_ids)))',
       user_id: user.id,
       project_ids: user.authorized_projects(Gitlab::Access::REPORTER).select(:id))
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index fff57472a4f..6d6bcbaf88a 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -180,16 +180,16 @@ module ApplicationHelper
     element
   end
 
-  def edited_time_ago_with_tooltip(object, placement: 'top', html_class: 'time_ago', include_author: false)
-    return if object.updated_at == object.created_at
+  def edited_time_ago_with_tooltip(object, placement: 'top', html_class: 'time_ago', exclude_author: false)
+    return if object.last_edited_at == object.created_at || object.last_edited_at.blank?
 
-    content_tag :small, class: "edited-text" do
-      output = content_tag(:span, "Edited ")
-      output << time_ago_with_tooltip(object.updated_at, placement: placement, html_class: html_class)
+    content_tag :small, class: 'edited-text' do
+      output = content_tag(:span, 'Edited ')
+      output << time_ago_with_tooltip(object.last_edited_at, placement: placement, html_class: html_class)
 
-      if include_author && object.updated_by && object.updated_by != object.author
-        output << content_tag(:span, " by ")
-        output << link_to_member(object.project, object.updated_by, avatar: false, author_class: nil)
+      if !exclude_author && object.last_edited_by
+        output << content_tag(:span, ' by ')
+        output << link_to_member(object.project, object.last_edited_by, avatar: false, author_class: nil)
       end
 
       output
diff --git a/app/helpers/builds_helper.rb b/app/helpers/builds_helper.rb
index 2fcb7a59fc3..2eb2c6c7389 100644
--- a/app/helpers/builds_helper.rb
+++ b/app/helpers/builds_helper.rb
@@ -1,4 +1,16 @@
 module BuildsHelper
+  def build_summary(build, skip: false)
+    if build.has_trace?
+      if skip
+        link_to "View job trace", pipeline_build_url(build.pipeline, build)
+      else
+        build.trace.html(last_lines: 10).html_safe
+      end
+    else
+      "No job trace"
+    end
+  end
+
   def sidebar_build_class(build, current_build)
     build_class = ''
     build_class += ' active' if build.id === current_build.id
diff --git a/app/helpers/form_helper.rb b/app/helpers/form_helper.rb
index 1182939f656..53962b84618 100644
--- a/app/helpers/form_helper.rb
+++ b/app/helpers/form_helper.rb
@@ -15,4 +15,36 @@ module FormHelper
         end
     end
   end
+
+  def issue_dropdown_options(issuable, has_multiple_assignees = true)
+    options = {
+      toggle_class: 'js-user-search js-assignee-search js-multiselect js-save-user-data',
+      title: 'Select assignee',
+      filter: true,
+      dropdown_class: 'dropdown-menu-user dropdown-menu-selectable dropdown-menu-assignee',
+      placeholder: 'Search users',
+      data: {
+        first_user: current_user&.username,
+        null_user: true,
+        current_user: true,
+        project_id: issuable.project.try(:id),
+        field_name: "#{issuable.class.model_name.param_key}[assignee_ids][]",
+        default_label: 'Assignee',
+        'max-select': 1,
+        'dropdown-header': 'Assignee',
+        multi_select: true,
+        'input-meta': 'name',
+        'always-show-selectbox': true,
+        current_user_info: current_user.to_json(only: [:id, :name])
+      }
+    }
+
+    if has_multiple_assignees
+      options[:title] = 'Select assignee(s)'
+      options[:data][:'dropdown-header'] = 'Assignee(s)'
+      options[:data].delete(:'max-select')
+    end
+
+    options
+  end
 end
diff --git a/app/helpers/gitlab_routing_helper.rb b/app/helpers/gitlab_routing_helper.rb
index 88f9a691a17..3769830de2a 100644
--- a/app/helpers/gitlab_routing_helper.rb
+++ b/app/helpers/gitlab_routing_helper.rb
@@ -123,7 +123,11 @@ module GitlabRoutingHelper
   end
 
   def preview_markdown_path(project, *args)
-    preview_markdown_namespace_project_path(project.namespace, project, *args)
+    if @snippet.is_a?(PersonalSnippet)
+      preview_markdown_snippet_path(@snippet)
+    else
+      preview_markdown_namespace_project_path(project.namespace, project, *args)
+    end
   end
 
   def toggle_subscription_path(entity, *args)
diff --git a/app/helpers/issuables_helper.rb b/app/helpers/issuables_helper.rb
index 0b13dbf5f8d..7656929efe7 100644
--- a/app/helpers/issuables_helper.rb
+++ b/app/helpers/issuables_helper.rb
@@ -63,6 +63,16 @@ module IssuablesHelper
     end
   end
 
+  def users_dropdown_label(selected_users)
+    if selected_users.length == 0
+      "Unassigned"
+    elsif selected_users.length == 1
+      selected_users[0].name
+    else
+      "#{selected_users[0].name} + #{selected_users.length - 1} more"
+    end
+  end
+
   def user_dropdown_label(user_id, default_label)
     return default_label if user_id.nil?
     return "Unassigned" if user_id == "0"
diff --git a/app/helpers/notes_helper.rb b/app/helpers/notes_helper.rb
index 08180883eb9..52403640c05 100644
--- a/app/helpers/notes_helper.rb
+++ b/app/helpers/notes_helper.rb
@@ -76,4 +76,47 @@ module NotesHelper
       namespace_project_commit_path(discussion.project.namespace, discussion.project, discussion.noteable, anchor: anchor)
     end
   end
+
+  def notes_url
+    if @snippet.is_a?(PersonalSnippet)
+      snippet_notes_path(@snippet)
+    else
+      namespace_project_noteable_notes_path(
+        namespace_id: @project.namespace,
+        project_id: @project,
+        target_id: @noteable.id,
+        target_type: @noteable.class.name.underscore
+      )
+    end
+  end
+
+  def note_url(note)
+    if note.noteable.is_a?(PersonalSnippet)
+      snippet_note_path(note.noteable, note)
+    else
+      namespace_project_note_path(@project.namespace, @project, note)
+    end
+  end
+
+  def form_resources
+    if @snippet.is_a?(PersonalSnippet)
+      [@note]
+    else
+      [@project.namespace.becomes(Namespace), @project, @note]
+    end
+  end
+
+  def new_form_url
+    return nil unless @snippet.is_a?(PersonalSnippet)
+
+    snippet_notes_path(@snippet)
+  end
+
+  def can_create_note?
+    if @snippet.is_a?(PersonalSnippet)
+      can?(current_user, :comment_personal_snippet, @snippet)
+    else
+      can?(current_user, :create_note, @project)
+    end
+  end
 end
diff --git a/app/helpers/system_note_helper.rb b/app/helpers/system_note_helper.rb
index 1ea60e39386..d889d141101 100644
--- a/app/helpers/system_note_helper.rb
+++ b/app/helpers/system_note_helper.rb
@@ -1,6 +1,7 @@
 module SystemNoteHelper
   ICON_NAMES_BY_ACTION = {
     'commit' => 'icon_commit',
+    'description' => 'icon_edit',
     'merge' => 'icon_merge',
     'merged' => 'icon_merged',
     'opened' => 'icon_status_open',
diff --git a/app/mailers/emails/issues.rb b/app/mailers/emails/issues.rb
index d64e48f774b..0f847841295 100644
--- a/app/mailers/emails/issues.rb
+++ b/app/mailers/emails/issues.rb
@@ -11,10 +11,12 @@ module Emails
       mail_answer_thread(@issue, issue_thread_options(updated_by_user_id, recipient_id))
     end
 
-    def reassigned_issue_email(recipient_id, issue_id, previous_assignee_id, updated_by_user_id)
+    def reassigned_issue_email(recipient_id, issue_id, previous_assignee_ids, updated_by_user_id)
       setup_issue_mail(issue_id, recipient_id)
 
-      @previous_assignee = User.find_by(id: previous_assignee_id) if previous_assignee_id
+      @previous_assignees = []
+      @previous_assignees = User.where(id: previous_assignee_ids) if previous_assignee_ids.any?
+
       mail_answer_thread(@issue, issue_thread_options(updated_by_user_id, recipient_id))
     end
 
diff --git a/app/models/application_setting.rb b/app/models/application_setting.rb
index cf042717c95..54f01f8637e 100644
--- a/app/models/application_setting.rb
+++ b/app/models/application_setting.rb
@@ -62,6 +62,10 @@ class ApplicationSetting < ActiveRecord::Base
             presence: true,
             if: :sentry_enabled
 
+  validates :clientside_sentry_dsn,
+            presence: true,
+            if: :clientside_sentry_enabled
+
   validates :akismet_api_key,
             presence: true,
             if: :akismet_enabled
diff --git a/app/models/blob.rb b/app/models/blob.rb
index a4fae22a0c4..eaf0b713122 100644
--- a/app/models/blob.rb
+++ b/app/models/blob.rb
@@ -26,6 +26,7 @@ class Blob < SimpleDelegator
 
     BlobViewer::Image,
     BlobViewer::Sketch,
+    BlobViewer::Balsamiq,
 
     BlobViewer::Video,
 
diff --git a/app/models/blob_viewer/balsamiq.rb b/app/models/blob_viewer/balsamiq.rb
new file mode 100644
index 00000000000..f982521db99
--- /dev/null
+++ b/app/models/blob_viewer/balsamiq.rb
@@ -0,0 +1,12 @@
+module BlobViewer
+  class Balsamiq < Base
+    include Rich
+    include ClientSide
+
+    self.partial_name = 'balsamiq'
+    self.extensions = %w(bmpr)
+    self.binary = true
+    self.switcher_icon = 'file-image-o'
+    self.switcher_title = 'preview'
+  end
+end
diff --git a/app/models/ci/group.rb b/app/models/ci/group.rb
new file mode 100644
index 00000000000..87898b086c6
--- /dev/null
+++ b/app/models/ci/group.rb
@@ -0,0 +1,40 @@
+module Ci
+  ##
+  # This domain model is a representation of a group of jobs that are related
+  # to each other, like `rspec 0 1`, `rspec 0 2`.
+  #
+  # It is not persisted in the database.
+  #
+  class Group
+    include StaticModel
+
+    attr_reader :stage, :name, :jobs
+
+    delegate :size, to: :jobs
+
+    def initialize(stage, name:, jobs:)
+      @stage = stage
+      @name = name
+      @jobs = jobs
+    end
+
+    def status
+      @status ||= commit_statuses.status
+    end
+
+    def detailed_status(current_user)
+      if jobs.one?
+        jobs.first.detailed_status(current_user)
+      else
+        Gitlab::Ci::Status::Group::Factory
+          .new(self, current_user).fabricate!
+      end
+    end
+
+    private
+
+    def commit_statuses
+      @commit_statuses ||= CommitStatus.where(id: jobs.map(&:id))
+    end
+  end
+end
diff --git a/app/models/ci/stage.rb b/app/models/ci/stage.rb
index e7d6b17d445..9bda3186c30 100644
--- a/app/models/ci/stage.rb
+++ b/app/models/ci/stage.rb
@@ -15,6 +15,14 @@ module Ci
       @warnings = warnings
     end
 
+    def groups
+      @groups ||= statuses.ordered.latest
+        .sort_by(&:sortable_name).group_by(&:group_name)
+        .map do |group_name, grouped_statuses|
+          Ci::Group.new(self, name: group_name, jobs: grouped_statuses)
+        end
+    end
+
     def to_param
       name
     end
diff --git a/app/models/concerns/issuable.rb b/app/models/concerns/issuable.rb
index 26dbf4d9570..075ec575f9d 100644
--- a/app/models/concerns/issuable.rb
+++ b/app/models/concerns/issuable.rb
@@ -26,8 +26,8 @@ module Issuable
     cache_markdown_field :description, issuable_state_filter_enabled: true
 
     belongs_to :author, class_name: "User"
-    belongs_to :assignee, class_name: "User"
     belongs_to :updated_by, class_name: "User"
+    belongs_to :last_edited_by, class_name: 'User'
     belongs_to :milestone
     has_many :notes, as: :noteable, inverse_of: :noteable, dependent: :destroy do
       def authors_loaded?
@@ -65,11 +65,8 @@ module Issuable
     validates :title, presence: true, length: { maximum: 255 }
 
     scope :authored, ->(user) { where(author_id: user) }
-    scope :assigned_to, ->(u) { where(assignee_id: u.id)}
     scope :recent, -> { reorder(id: :desc) }
     scope :order_position_asc, -> { reorder(position: :asc) }
-    scope :assigned, -> { where("assignee_id IS NOT NULL") }
-    scope :unassigned, -> { where("assignee_id IS NULL") }
     scope :of_projects, ->(ids) { where(project_id: ids) }
     scope :of_milestones, ->(ids) { where(milestone_id: ids) }
     scope :with_milestone, ->(title) { left_joins_milestones.where(milestones: { title: title }) }
@@ -92,23 +89,14 @@ module Issuable
     attr_mentionable :description
 
     participant :author
-    participant :assignee
     participant :notes_with_associations
 
     strip_attributes :title
 
     acts_as_paranoid
 
-    after_save :update_assignee_cache_counts, if: :assignee_id_changed?
     after_save :record_metrics, unless: :imported?
 
-    def update_assignee_cache_counts
-      # make sure we flush the cache for both the old *and* new assignees(if they exist)
-      previous_assignee = User.find_by_id(assignee_id_was) if assignee_id_was
-      previous_assignee&.update_cache_counts
-      assignee&.update_cache_counts
-    end
-
     # We want to use optimistic lock for cases when only title or description are involved
     # http://api.rubyonrails.org/classes/ActiveRecord/Locking/Optimistic.html
     def locking_enabled?
@@ -237,10 +225,6 @@ module Issuable
     today? && created_at == updated_at
   end
 
-  def is_being_reassigned?
-    assignee_id_changed?
-  end
-
   def open?
     opened? || reopened?
   end
@@ -269,7 +253,11 @@ module Issuable
       # DEPRECATED
       repository: project.hook_attrs.slice(:name, :url, :description, :homepage)
     }
-    hook_data[:assignee] = assignee.hook_attrs if assignee
+    if self.is_a?(Issue)
+      hook_data[:assignees] = assignees.map(&:hook_attrs) if assignees.any?
+    else
+      hook_data[:assignee] = assignee.hook_attrs if assignee
+    end
 
     hook_data
   end
@@ -331,11 +319,6 @@ module Issuable
     false
   end
 
-  def assignee_or_author?(user)
-    # We're comparing IDs here so we don't need to load any associations.
-    author_id == user.id || assignee_id == user.id
-  end
-
   def record_metrics
     metrics = self.metrics || create_metrics
     metrics.record!
diff --git a/app/models/concerns/milestoneish.rb b/app/models/concerns/milestoneish.rb
index f449229864d..a3472af5c55 100644
--- a/app/models/concerns/milestoneish.rb
+++ b/app/models/concerns/milestoneish.rb
@@ -40,7 +40,7 @@ module Milestoneish
   def issues_visible_to_user(user)
     memoize_per_user(user, :issues_visible_to_user) do
       IssuesFinder.new(user, issues_finder_params)
-        .execute.where(milestone_id: milestoneish_ids)
+        .execute.includes(:assignees).where(milestone_id: milestoneish_ids)
     end
   end
 
diff --git a/app/models/concerns/routable.rb b/app/models/concerns/routable.rb
index b28e05d0c28..c4463abdfe6 100644
--- a/app/models/concerns/routable.rb
+++ b/app/models/concerns/routable.rb
@@ -5,6 +5,7 @@ module Routable
 
   included do
     has_one :route, as: :source, autosave: true, dependent: :destroy
+    has_many :redirect_routes, as: :source, autosave: true, dependent: :destroy
 
     validates_associated :route
     validates :route, presence: true
@@ -26,16 +27,31 @@ module Routable
     #     Klass.find_by_full_path('gitlab-org/gitlab-ce')
     #
     # Returns a single object, or nil.
-    def find_by_full_path(path)
+    def find_by_full_path(path, follow_redirects: false)
       # On MySQL we want to ensure the ORDER BY uses a case-sensitive match so
       # any literal matches come first, for this we have to use "BINARY".
       # Without this there's still no guarantee in what order MySQL will return
       # rows.
+      #
+      # Why do we do this?
+      #
+      # Even though we have Rails validation on Route for unique paths
+      # (case-insensitive), there are old projects in our DB (and possibly
+      # clients' DBs) that have the same path with different cases.
+      # See https://gitlab.com/gitlab-org/gitlab-ce/issues/18603. Also note that
+      # our unique index is case-sensitive in Postgres.
       binary = Gitlab::Database.mysql? ? 'BINARY' : ''
-
       order_sql = "(CASE WHEN #{binary} routes.path = #{connection.quote(path)} THEN 0 ELSE 1 END)"
-
-      where_full_path_in([path]).reorder(order_sql).take
+      found = where_full_path_in([path]).reorder(order_sql).take
+      return found if found
+
+      if follow_redirects
+        if Gitlab::Database.postgresql?
+          joins(:redirect_routes).find_by("LOWER(redirect_routes.path) = LOWER(?)", path)
+        else
+          joins(:redirect_routes).find_by(redirect_routes: { path: path })
+        end
+      end
     end
 
     # Builds a relation to find multiple objects by their full paths.
diff --git a/app/models/global_milestone.rb b/app/models/global_milestone.rb
index 0afbca2cb32..538615130a7 100644
--- a/app/models/global_milestone.rb
+++ b/app/models/global_milestone.rb
@@ -36,7 +36,7 @@ class GlobalMilestone
     closed = count_by_state(milestones_by_state_and_title, 'closed')
     all = milestones_by_state_and_title.map { |(_, title), _| title }.uniq.count
 
-    { 
+    {
       opened: opened,
       closed: closed,
       all: all
@@ -86,7 +86,7 @@ class GlobalMilestone
   end
 
   def issues
-    @issues ||= Issue.of_milestones(milestoneish_ids).includes(:project, :assignee, :labels)
+    @issues ||= Issue.of_milestones(milestoneish_ids).includes(:project, :assignees, :labels)
   end
 
   def merge_requests
@@ -94,7 +94,7 @@ class GlobalMilestone
   end
 
   def participants
-    @participants ||= milestones.includes(:participants).map(&:participants).flatten.compact.uniq
+    @participants ||= milestones.map(&:participants).flatten.uniq
   end
 
   def labels
diff --git a/app/models/issue.rb b/app/models/issue.rb
index 78bde6820da..27e3ed9bc7f 100644
--- a/app/models/issue.rb
+++ b/app/models/issue.rb
@@ -24,10 +24,17 @@ class Issue < ActiveRecord::Base
 
   has_many :merge_requests_closing_issues, class_name: 'MergeRequestsClosingIssues', dependent: :delete_all
 
+  has_many :issue_assignees
+  has_many :assignees, class_name: "User", through: :issue_assignees
+
   validates :project, presence: true
 
   scope :in_projects, ->(project_ids) { where(project_id: project_ids) }
 
+  scope :assigned, -> { where('EXISTS (SELECT TRUE FROM issue_assignees WHERE issue_id = issues.id)') }
+  scope :unassigned, -> { where('NOT EXISTS (SELECT TRUE FROM issue_assignees WHERE issue_id = issues.id)') }
+  scope :assigned_to, ->(u) { where('EXISTS (SELECT TRUE FROM issue_assignees WHERE user_id = ? AND issue_id = issues.id)', u.id)}
+
   scope :without_due_date, -> { where(due_date: nil) }
   scope :due_before, ->(date) { where('issues.due_date < ?', date) }
   scope :due_between, ->(from_date, to_date) { where('issues.due_date >= ?', from_date).where('issues.due_date <= ?', to_date) }
@@ -37,13 +44,15 @@ class Issue < ActiveRecord::Base
 
   scope :created_after, -> (datetime) { where("created_at >= ?", datetime) }
 
-  scope :include_associations, -> { includes(:assignee, :labels, project: :namespace) }
+  scope :include_associations, -> { includes(:labels, project: :namespace) }
 
   after_save :expire_etag_cache
 
   attr_spammable :title, spam_title: true
   attr_spammable :description, spam_description: true
 
+  participant :assignees
+
   state_machine :state, initial: :opened do
     event :close do
       transition [:reopened, :opened] => :closed
@@ -63,10 +72,14 @@ class Issue < ActiveRecord::Base
   end
 
   def hook_attrs
+    assignee_ids = self.assignee_ids
+
     attrs = {
       total_time_spent: total_time_spent,
       human_total_time_spent: human_total_time_spent,
-      human_time_estimate: human_time_estimate
+      human_time_estimate: human_time_estimate,
+      assignee_ids: assignee_ids,
+      assignee_id: assignee_ids.first # This key is deprecated
     }
 
     attributes.merge!(attrs)
@@ -114,6 +127,22 @@ class Issue < ActiveRecord::Base
               "id DESC")
   end
 
+  # Returns a Hash of attributes to be used for Twitter card metadata
+  def card_attributes
+    {
+      'Author'   => author.try(:name),
+      'Assignee' => assignee_list
+    }
+  end
+
+  def assignee_or_author?(user)
+    author_id == user.id || assignees.exists?(user.id)
+  end
+
+  def assignee_list
+    assignees.map(&:name).to_sentence
+  end
+
   # `from` argument can be a Namespace or Project.
   def to_reference(from = nil, full: false)
     reference = "#{self.class.reference_prefix}#{iid}"
@@ -248,7 +277,7 @@ class Issue < ActiveRecord::Base
       true
     elsif confidential?
       author == user ||
-        assignee == user ||
+        assignees.include?(user) ||
         project.team.member?(user, Gitlab::Access::REPORTER)
     else
       project.public? ||
diff --git a/app/models/issue_assignee.rb b/app/models/issue_assignee.rb
new file mode 100644
index 00000000000..0663d3aaef8
--- /dev/null
+++ b/app/models/issue_assignee.rb
@@ -0,0 +1,13 @@
+class IssueAssignee < ActiveRecord::Base
+  extend Gitlab::CurrentSettings
+
+  belongs_to :issue
+  belongs_to :assignee, class_name: "User", foreign_key: :user_id
+
+  after_create :update_assignee_cache_counts
+  after_destroy :update_assignee_cache_counts
+
+  def update_assignee_cache_counts
+    assignee&.update_cache_counts
+  end
+end
diff --git a/app/models/merge_request.rb b/app/models/merge_request.rb
index 12c5481cd6d..35231bab12e 100644
--- a/app/models/merge_request.rb
+++ b/app/models/merge_request.rb
@@ -17,6 +17,8 @@ class MergeRequest < ActiveRecord::Base
 
   has_many :merge_requests_closing_issues, class_name: 'MergeRequestsClosingIssues', dependent: :delete_all
 
+  belongs_to :assignee, class_name: "User"
+
   serialize :merge_params, Hash
 
   after_create :ensure_merge_request_diff, unless: :importing?
@@ -114,8 +116,14 @@ class MergeRequest < ActiveRecord::Base
 
   scope :join_project, -> { joins(:target_project) }
   scope :references_project, -> { references(:target_project) }
+  scope :assigned, -> { where("assignee_id IS NOT NULL") }
+  scope :unassigned, -> { where("assignee_id IS NULL") }
+  scope :assigned_to, ->(u) { where(assignee_id: u.id)}
+
+  participant :assignee
 
   after_save :keep_around_commit
+  after_save :update_assignee_cache_counts, if: :assignee_id_changed?
 
   def self.reference_prefix
     '!'
@@ -177,6 +185,30 @@ class MergeRequest < ActiveRecord::Base
     work_in_progress?(title) ? title : "WIP: #{title}"
   end
 
+  def update_assignee_cache_counts
+    # make sure we flush the cache for both the old *and* new assignees(if they exist)
+    previous_assignee = User.find_by_id(assignee_id_was) if assignee_id_was
+    previous_assignee&.update_cache_counts
+    assignee&.update_cache_counts
+  end
+
+  # Returns a Hash of attributes to be used for Twitter card metadata
+  def card_attributes
+    {
+      'Author'   => author.try(:name),
+      'Assignee' => assignee.try(:name)
+    }
+  end
+
+  # This method is needed for compatibility with issues to not mess view and other code
+  def assignees
+    Array(assignee)
+  end
+
+  def assignee_or_author?(user)
+    author_id == user.id || assignee_id == user.id
+  end
+
   # `from` argument can be a Namespace or Project.
   def to_reference(from = nil, full: false)
     reference = "#{self.class.reference_prefix}#{iid}"
diff --git a/app/models/milestone.rb b/app/models/milestone.rb
index 652b1551928..c06bfe0ccdd 100644
--- a/app/models/milestone.rb
+++ b/app/models/milestone.rb
@@ -21,7 +21,6 @@ class Milestone < ActiveRecord::Base
   has_many :issues
   has_many :labels, -> { distinct.reorder('labels.title') },  through: :issues
   has_many :merge_requests
-  has_many :participants, -> { distinct.reorder('users.name') }, through: :issues, source: :assignee
   has_many :events, as: :target, dependent: :destroy
 
   scope :active, -> { with_state(:active) }
@@ -107,6 +106,10 @@ class Milestone < ActiveRecord::Base
     end
   end
 
+  def participants
+    User.joins(assigned_issues: :milestone).where("milestones.id = ?", id)
+  end
+
   def self.sort(method)
     case method.to_s
     when 'due_date_asc'
diff --git a/app/models/note.rb b/app/models/note.rb
index b06985b4a6f..46d0a4f159f 100644
--- a/app/models/note.rb
+++ b/app/models/note.rb
@@ -18,6 +18,11 @@ class Note < ActiveRecord::Base
 
   cache_markdown_field :note, pipeline: :note, issuable_state_filter_enabled: true
 
+  # Aliases to make application_helper#edited_time_ago_with_tooltip helper work properly with notes.
+  # See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10392/diffs#note_28719102
+  alias_attribute :last_edited_at, :updated_at
+  alias_attribute :last_edited_by, :updated_by
+
   # Attribute containing rendered and redacted Markdown as generated by
   # Banzai::ObjectRenderer.
   attr_accessor :redacted_note_html
@@ -38,6 +43,7 @@ class Note < ActiveRecord::Base
   belongs_to :noteable, polymorphic: true, touch: true
   belongs_to :author, class_name: "User"
   belongs_to :updated_by, class_name: "User"
+  belongs_to :last_edited_by, class_name: 'User'
 
   has_many :todos, dependent: :destroy
   has_many :events, as: :target, dependent: :destroy
diff --git a/app/models/redirect_route.rb b/app/models/redirect_route.rb
new file mode 100644
index 00000000000..99812bcde53
--- /dev/null
+++ b/app/models/redirect_route.rb
@@ -0,0 +1,12 @@
+class RedirectRoute < ActiveRecord::Base
+  belongs_to :source, polymorphic: true
+
+  validates :source, presence: true
+
+  validates :path,
+    length: { within: 1..255 },
+    presence: true,
+    uniqueness: { case_sensitive: false }
+
+  scope :matching_path_and_descendants, -> (path) { where('redirect_routes.path = ? OR redirect_routes.path LIKE ?', path, "#{sanitize_sql_like(path)}/%") }
+end
diff --git a/app/models/route.rb b/app/models/route.rb
index 4b3efab5c3c..12a7fa3d01b 100644
--- a/app/models/route.rb
+++ b/app/models/route.rb
@@ -8,29 +8,58 @@ class Route < ActiveRecord::Base
     presence: true,
     uniqueness: { case_sensitive: false }
 
+  after_create :delete_conflicting_redirects
+  after_update :delete_conflicting_redirects, if: :path_changed?
+  after_update :create_redirect_for_old_path
   after_update :rename_descendants
 
   scope :inside_path, -> (path) { where('routes.path LIKE ?', "#{sanitize_sql_like(path)}/%") }
 
   def rename_descendants
-    if path_changed? || name_changed?
-      descendants = self.class.inside_path(path_was)
+    return unless path_changed? || name_changed?
 
-      descendants.each do |route|
-        attributes = {}
+    descendant_routes = self.class.inside_path(path_was)
 
-        if path_changed? && route.path.present?
-          attributes[:path] = route.path.sub(path_was, path)
-        end
+    descendant_routes.each do |route|
+      attributes = {}
 
-        if name_changed? && name_was.present? && route.name.present?
-          attributes[:name] = route.name.sub(name_was, name)
-        end
+      if path_changed? && route.path.present?
+        attributes[:path] = route.path.sub(path_was, path)
+      end
 
-        # Note that update_columns skips validation and callbacks.
-        # We need this to avoid recursive call of rename_descendants method
-        route.update_columns(attributes) unless attributes.empty?
+      if name_changed? && name_was.present? && route.name.present?
+        attributes[:name] = route.name.sub(name_was, name)
+      end
+
+      if attributes.present?
+        old_path = route.path
+
+        # Callbacks must be run manually
+        route.update_columns(attributes)
+
+        # We are not calling route.delete_conflicting_redirects here, in hopes
+        # of avoiding deadlocks. The parent (self, in this method) already
+        # called it, which deletes conflicts for all descendants.
+        route.create_redirect(old_path) if attributes[:path]
       end
     end
   end
+
+  def delete_conflicting_redirects
+    conflicting_redirects.delete_all
+  end
+
+  def conflicting_redirects
+    RedirectRoute.matching_path_and_descendants(path)
+  end
+
+  def create_redirect(path)
+    RedirectRoute.create(source: source, path: path)
+  end
+
+  private
+
+  def create_redirect_for_old_path
+    create_redirect(path_was) if path_changed?
+  end
 end
diff --git a/app/models/snippet.rb b/app/models/snippet.rb
index d8860718cb5..abfbefdf9a0 100644
--- a/app/models/snippet.rb
+++ b/app/models/snippet.rb
@@ -12,6 +12,11 @@ class Snippet < ActiveRecord::Base
   cache_markdown_field :title, pipeline: :single_line
   cache_markdown_field :content
 
+  # Aliases to make application_helper#edited_time_ago_with_tooltip helper work properly with snippets.
+  # See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10392/diffs#note_28719102
+  alias_attribute :last_edited_at, :updated_at
+  alias_attribute :last_edited_by, :updated_by
+
   # If file_name changes, it invalidates content
   alias_method :default_content_html_invalidator, :content_html_invalidated?
   def content_html_invalidated?
diff --git a/app/models/system_note_metadata.rb b/app/models/system_note_metadata.rb
index 1e6fc837a75..b44f4fe000c 100644
--- a/app/models/system_note_metadata.rb
+++ b/app/models/system_note_metadata.rb
@@ -1,6 +1,6 @@
 class SystemNoteMetadata < ActiveRecord::Base
   ICON_TYPES = %w[
-    commit merge confidential visible label assignee cross_reference
+    commit description merge confidential visible label assignee cross_reference
     title time_tracking branch milestone discussion task moved opened closed merged
   ].freeze
 
diff --git a/app/models/user.rb b/app/models/user.rb
index 43c5fdc038d..accaa91b805 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -100,6 +100,10 @@ class User < ActiveRecord::Base
   has_many :award_emoji,              dependent: :destroy
   has_many :triggers,                 dependent: :destroy, class_name: 'Ci::Trigger', foreign_key: :owner_id
 
+  has_many :issue_assignees
+  has_many :assigned_issues, class_name: "Issue", through: :issue_assignees, source: :issue
+  has_many :assigned_merge_requests,  dependent: :nullify, foreign_key: :assignee_id, class_name: "MergeRequest"
+
   # Issues that a user owns are expected to be moved to the "ghost" user before
   # the user is destroyed. If the user owns any issues during deletion, this
   # should be treated as an exceptional condition.
@@ -333,6 +337,11 @@ class User < ActiveRecord::Base
       find_by(id: Key.unscoped.select(:user_id).where(id: key_id))
     end
 
+    def find_by_full_path(path, follow_redirects: false)
+      namespace = Namespace.find_by_full_path(path, follow_redirects: follow_redirects)
+      namespace&.owner
+    end
+
     def reference_prefix
       '@'
     end
@@ -355,6 +364,10 @@ class User < ActiveRecord::Base
     end
   end
 
+  def full_path
+    username
+  end
+
   def self.internal_attributes
     [:ghost]
   end
diff --git a/app/serializers/issuable_entity.rb b/app/serializers/issuable_entity.rb
index 29aecb50849..65b204d4dd2 100644
--- a/app/serializers/issuable_entity.rb
+++ b/app/serializers/issuable_entity.rb
@@ -1,7 +1,6 @@
 class IssuableEntity < Grape::Entity
   expose :id
   expose :iid
-  expose :assignee_id
   expose :author_id
   expose :description
   expose :lock_version
diff --git a/app/serializers/issue_entity.rb b/app/serializers/issue_entity.rb
index 6429159ebe1..bc4f68710b2 100644
--- a/app/serializers/issue_entity.rb
+++ b/app/serializers/issue_entity.rb
@@ -1,6 +1,7 @@
 class IssueEntity < IssuableEntity
   expose :branch_name
   expose :confidential
+  expose :assignees, using: API::Entities::UserBasic
   expose :due_date
   expose :moved_to_id
   expose :project_id
diff --git a/app/serializers/job_group_entity.rb b/app/serializers/job_group_entity.rb
new file mode 100644
index 00000000000..a4d3737429c
--- /dev/null
+++ b/app/serializers/job_group_entity.rb
@@ -0,0 +1,16 @@
+class JobGroupEntity < Grape::Entity
+  include RequestAwareEntity
+
+  expose :name
+  expose :size
+  expose :detailed_status, as: :status, with: StatusEntity
+  expose :jobs, with: BuildEntity
+
+  private
+
+  alias_method :group, :object
+
+  def detailed_status
+    group.detailed_status(request.user)
+  end
+end
diff --git a/app/serializers/label_entity.rb b/app/serializers/label_entity.rb
index 304fd9de08f..ad565654342 100644
--- a/app/serializers/label_entity.rb
+++ b/app/serializers/label_entity.rb
@@ -6,6 +6,7 @@ class LabelEntity < Grape::Entity
   expose :group_id
   expose :project_id
   expose :template
+  expose :text_color
   expose :created_at
   expose :updated_at
 end
diff --git a/app/serializers/label_serializer.rb b/app/serializers/label_serializer.rb
new file mode 100644
index 00000000000..ad6ba8c46c9
--- /dev/null
+++ b/app/serializers/label_serializer.rb
@@ -0,0 +1,7 @@
+class LabelSerializer < BaseSerializer
+  entity LabelEntity
+
+  def represent_appearance(resource)
+    represent(resource, { only: [:id, :title, :color, :text_color] })
+  end
+end
diff --git a/app/serializers/merge_request_entity.rb b/app/serializers/merge_request_entity.rb
index 5f80ab397a9..453ba52b892 100644
--- a/app/serializers/merge_request_entity.rb
+++ b/app/serializers/merge_request_entity.rb
@@ -1,4 +1,5 @@
 class MergeRequestEntity < IssuableEntity
+  expose :assignee_id
   expose :in_progress_merge_commit_sha
   expose :locked_at
   expose :merge_commit_sha
diff --git a/app/serializers/stage_entity.rb b/app/serializers/stage_entity.rb
index 7a047bdc712..97ced8730ed 100644
--- a/app/serializers/stage_entity.rb
+++ b/app/serializers/stage_entity.rb
@@ -7,9 +7,11 @@ class StageEntity < Grape::Entity
     "#{stage.name}: #{detailed_status.label}"
   end
 
-  expose :detailed_status,
-    as: :status,
-    with: StatusEntity
+  expose :groups,
+    if: -> (_, opts) { opts[:grouped] },
+    with: JobGroupEntity
+
+  expose :detailed_status, as: :status, with: StatusEntity
 
   expose :path do |stage|
     namespace_project_pipeline_path(
diff --git a/app/serializers/status_entity.rb b/app/serializers/status_entity.rb
index 188c3747f18..3e40ecf1c1c 100644
--- a/app/serializers/status_entity.rb
+++ b/app/serializers/status_entity.rb
@@ -12,4 +12,11 @@ class StatusEntity < Grape::Entity
 
     ActionController::Base.helpers.image_path(File.join(dir, "#{status.favicon}.ico"))
   end
+
+  expose :action, if: -> (status, _) { status.has_action? } do
+    expose :action_icon, as: :icon
+    expose :action_title, as: :title
+    expose :action_path, as: :path
+    expose :action_method, as: :method
+  end
 end
diff --git a/app/services/issuable/bulk_update_service.rb b/app/services/issuable/bulk_update_service.rb
index 60891cbb255..40ff9b8b867 100644
--- a/app/services/issuable/bulk_update_service.rb
+++ b/app/services/issuable/bulk_update_service.rb
@@ -7,10 +7,14 @@ module Issuable
       ids = params.delete(:issuable_ids).split(",")
       items = model_class.where(id: ids)
 
-      %i(state_event milestone_id assignee_id add_label_ids remove_label_ids subscription_event).each do |key|
+      %i(state_event milestone_id assignee_id assignee_ids add_label_ids remove_label_ids subscription_event).each do |key|
         params.delete(key) unless params[key].present?
       end
 
+      if params[:assignee_ids] == [IssuableFinder::NONE.to_s]
+        params[:assignee_ids] = []
+      end
+
       items.each do |issuable|
         next unless can?(current_user, :"update_#{type}", issuable)
 
diff --git a/app/services/issuable_base_service.rb b/app/services/issuable_base_service.rb
index b071a398481..c1e532b504a 100644
--- a/app/services/issuable_base_service.rb
+++ b/app/services/issuable_base_service.rb
@@ -1,11 +1,6 @@
 class IssuableBaseService < BaseService
   private
 
-  def create_assignee_note(issuable)
-    SystemNoteService.change_assignee(
-      issuable, issuable.project, current_user, issuable.assignee)
-  end
-
   def create_milestone_note(issuable)
     SystemNoteService.change_milestone(
       issuable, issuable.project, current_user, issuable.milestone)
@@ -24,6 +19,10 @@ class IssuableBaseService < BaseService
       issuable, issuable.project, current_user, old_title)
   end
 
+  def create_description_change_note(issuable)
+    SystemNoteService.change_description(issuable, issuable.project, current_user)
+  end
+
   def create_branch_change_note(issuable, branch_type, old_branch, new_branch)
     SystemNoteService.change_branch(
       issuable, issuable.project, current_user, branch_type,
@@ -53,6 +52,7 @@ class IssuableBaseService < BaseService
       params.delete(:add_label_ids)
       params.delete(:remove_label_ids)
       params.delete(:label_ids)
+      params.delete(:assignee_ids)
       params.delete(:assignee_id)
       params.delete(:due_date)
     end
@@ -77,7 +77,7 @@ class IssuableBaseService < BaseService
   def assignee_can_read?(issuable, assignee_id)
     new_assignee = User.find_by_id(assignee_id)
 
-    return false unless new_assignee.present?
+    return false unless new_assignee
 
     ability_name = :"read_#{issuable.to_ability_name}"
     resource     = issuable.persisted? ? issuable : project
@@ -207,6 +207,7 @@ class IssuableBaseService < BaseService
     filter_params(issuable)
     old_labels = issuable.labels.to_a
     old_mentioned_users = issuable.mentioned_users.to_a
+    old_assignees = issuable.assignees.to_a
 
     label_ids = process_label_ids(params, existing_label_ids: issuable.label_ids)
     params[:label_ids] = label_ids if labels_changing?(issuable.label_ids, label_ids)
@@ -214,6 +215,10 @@ class IssuableBaseService < BaseService
     if issuable.changed? || params.present?
       issuable.assign_attributes(params.merge(updated_by: current_user))
 
+      if has_title_or_description_changed?(issuable)
+        issuable.assign_attributes(last_edited_at: Time.now, last_edited_by: current_user)
+      end
+
       before_update(issuable)
 
       if issuable.with_transaction_returning_status { issuable.save }
@@ -222,7 +227,13 @@ class IssuableBaseService < BaseService
           handle_common_system_notes(issuable, old_labels: old_labels)
         end
 
-        handle_changes(issuable, old_labels: old_labels, old_mentioned_users: old_mentioned_users)
+        handle_changes(
+          issuable,
+          old_labels: old_labels,
+          old_mentioned_users: old_mentioned_users,
+          old_assignees: old_assignees
+        )
+
         after_update(issuable)
         issuable.create_new_cross_references!(current_user)
         execute_hooks(issuable, 'update')
@@ -236,6 +247,10 @@ class IssuableBaseService < BaseService
     old_label_ids.sort != new_label_ids.sort
   end
 
+  def has_title_or_description_changed?(issuable)
+    issuable.title_changed? || issuable.description_changed?
+  end
+
   def change_state(issuable)
     case params.delete(:state_event)
     when 'reopen'
@@ -272,7 +287,7 @@ class IssuableBaseService < BaseService
     end
   end
 
-  def has_changes?(issuable, old_labels: [])
+  def has_changes?(issuable, old_labels: [], old_assignees: [])
     valid_attrs = [:title, :description, :assignee_id, :milestone_id, :target_branch]
 
     attrs_changed = valid_attrs.any? do |attr|
@@ -281,7 +296,9 @@ class IssuableBaseService < BaseService
 
     labels_changed = issuable.labels != old_labels
 
-    attrs_changed || labels_changed
+    assignees_changed = issuable.assignees != old_assignees
+
+    attrs_changed || labels_changed || assignees_changed
   end
 
   def handle_common_system_notes(issuable, old_labels: [])
@@ -289,6 +306,10 @@ class IssuableBaseService < BaseService
       create_title_change_note(issuable, issuable.previous_changes['title'].first)
     end
 
+    if issuable.previous_changes.include?('description')
+      create_description_change_note(issuable)
+    end
+
     if issuable.previous_changes.include?('description') && issuable.tasks?
       create_task_status_note(issuable)
     end
diff --git a/app/services/issues/base_service.rb b/app/services/issues/base_service.rb
index ee1b40db718..34199eb5d13 100644
--- a/app/services/issues/base_service.rb
+++ b/app/services/issues/base_service.rb
@@ -9,11 +9,33 @@ module Issues
 
     private
 
+    def create_assignee_note(issue, old_assignees)
+      SystemNoteService.change_issue_assignees(
+        issue, issue.project, current_user, old_assignees)
+    end
+
     def execute_hooks(issue, action = 'open')
       issue_data  = hook_data(issue, action)
       hooks_scope = issue.confidential? ? :confidential_issue_hooks : :issue_hooks
       issue.project.execute_hooks(issue_data, hooks_scope)
       issue.project.execute_services(issue_data, hooks_scope)
     end
+
+    def filter_assignee(issuable)
+      return if params[:assignee_ids].blank?
+
+      # The number of assignees is limited by one for GitLab CE
+      params[:assignee_ids] = params[:assignee_ids][0, 1]
+
+      assignee_ids = params[:assignee_ids].select { |assignee_id| assignee_can_read?(issuable, assignee_id) }
+
+      if params[:assignee_ids].map(&:to_s) == [IssuableFinder::NONE]
+        params[:assignee_ids] = []
+      elsif assignee_ids.any?
+        params[:assignee_ids] = assignee_ids
+      else
+        params.delete(:assignee_ids)
+      end
+    end
   end
 end
diff --git a/app/services/issues/update_service.rb b/app/services/issues/update_service.rb
index b7fe5cb168b..cd9f9a4a16e 100644
--- a/app/services/issues/update_service.rb
+++ b/app/services/issues/update_service.rb
@@ -12,8 +12,12 @@ module Issues
       spam_check(issue, current_user)
     end
 
-    def handle_changes(issue, old_labels: [], old_mentioned_users: [])
-      if has_changes?(issue, old_labels: old_labels)
+    def handle_changes(issue, options)
+      old_labels = options[:old_labels] || []
+      old_mentioned_users = options[:old_mentioned_users] || []
+      old_assignees = options[:old_assignees] || []
+
+      if has_changes?(issue, old_labels: old_labels, old_assignees: old_assignees)
         todo_service.mark_pending_todos_as_done(issue, current_user)
       end
 
@@ -26,9 +30,9 @@ module Issues
         create_milestone_note(issue)
       end
 
-      if issue.previous_changes.include?('assignee_id')
-        create_assignee_note(issue)
-        notification_service.reassigned_issue(issue, current_user)
+      if issue.assignees != old_assignees
+        create_assignee_note(issue, old_assignees)
+        notification_service.reassigned_issue(issue, current_user, old_assignees)
         todo_service.reassigned_issue(issue, current_user)
       end
 
diff --git a/app/services/members/authorized_destroy_service.rb b/app/services/members/authorized_destroy_service.rb
index 1711be7211c..a85b9465c84 100644
--- a/app/services/members/authorized_destroy_service.rb
+++ b/app/services/members/authorized_destroy_service.rb
@@ -26,15 +26,22 @@ module Members
 
     def unassign_issues_and_merge_requests(member)
       if member.is_a?(GroupMember)
-        IssuesFinder.new(user, group_id: member.source_id, assignee_id: member.user_id).
-          execute.
-          update_all(assignee_id: nil)
+        issue_ids = IssuesFinder.new(user, group_id: member.source_id, assignee_id: member.user_id).
+          execute.pluck(:id)
+
+        IssueAssignee.destroy_all(issue_id: issue_ids, user_id: member.user_id)
+
         MergeRequestsFinder.new(user, group_id: member.source_id, assignee_id: member.user_id).
           execute.
           update_all(assignee_id: nil)
       else
         project = member.source
-        project.issues.opened.assigned_to(member.user).update_all(assignee_id: nil)
+
+        IssueAssignee.destroy_all(
+          user_id: member.user_id,
+          issue_id: project.issues.opened.assigned_to(member.user).select(:id)
+        )
+
         project.merge_requests.opened.assigned_to(member.user).update_all(assignee_id: nil)
         member.user.update_cache_counts
       end
diff --git a/app/services/merge_requests/assign_issues_service.rb b/app/services/merge_requests/assign_issues_service.rb
index 066efa1acc3..8c6c4841020 100644
--- a/app/services/merge_requests/assign_issues_service.rb
+++ b/app/services/merge_requests/assign_issues_service.rb
@@ -4,7 +4,7 @@ module MergeRequests
       @assignable_issues ||= begin
         if current_user == merge_request.author
           closes_issues.select do |issue|
-            !issue.is_a?(ExternalIssue) && !issue.assignee_id? && can?(current_user, :admin_issue, issue)
+            !issue.is_a?(ExternalIssue) && !issue.assignees.present? && can?(current_user, :admin_issue, issue)
           end
         else
           []
@@ -14,7 +14,7 @@ module MergeRequests
 
     def execute
       assignable_issues.each do |issue|
-        Issues::UpdateService.new(issue.project, current_user, assignee_id: current_user.id).execute(issue)
+        Issues::UpdateService.new(issue.project, current_user, assignee_ids: [current_user.id]).execute(issue)
       end
 
       {
diff --git a/app/services/merge_requests/base_service.rb b/app/services/merge_requests/base_service.rb
index 582d5c47b66..3542a41ac83 100644
--- a/app/services/merge_requests/base_service.rb
+++ b/app/services/merge_requests/base_service.rb
@@ -38,6 +38,11 @@ module MergeRequests
 
     private
 
+    def create_assignee_note(merge_request)
+      SystemNoteService.change_assignee(
+        merge_request, merge_request.project, current_user, merge_request.assignee)
+    end
+
     # Returns all origin and fork merge requests from `@project` satisfying passed arguments.
     def merge_requests_for(source_branch, mr_states: [:opened, :reopened])
       MergeRequest
diff --git a/app/services/merge_requests/update_service.rb b/app/services/merge_requests/update_service.rb
index ab7fcf3b6e2..5c843a258fb 100644
--- a/app/services/merge_requests/update_service.rb
+++ b/app/services/merge_requests/update_service.rb
@@ -21,7 +21,10 @@ module MergeRequests
       update(merge_request)
     end
 
-    def handle_changes(merge_request, old_labels: [], old_mentioned_users: [])
+    def handle_changes(merge_request, options)
+      old_labels = options[:old_labels] || []
+      old_mentioned_users = options[:old_mentioned_users] || []
+
       if has_changes?(merge_request, old_labels: old_labels)
         todo_service.mark_pending_todos_as_done(merge_request, current_user)
       end
diff --git a/app/services/notes/build_service.rb b/app/services/notes/build_service.rb
index ea7cacc956c..abf25bb778b 100644
--- a/app/services/notes/build_service.rb
+++ b/app/services/notes/build_service.rb
@@ -3,8 +3,8 @@ module Notes
     def execute
       in_reply_to_discussion_id = params.delete(:in_reply_to_discussion_id)
 
-      if project && in_reply_to_discussion_id.present?
-        discussion = project.notes.find_discussion(in_reply_to_discussion_id)
+      if in_reply_to_discussion_id.present?
+        discussion = find_discussion(in_reply_to_discussion_id)
 
         unless discussion
           note = Note.new
@@ -21,5 +21,19 @@ module Notes
 
       note
     end
+
+    def find_discussion(discussion_id)
+      if project
+        project.notes.find_discussion(discussion_id)
+      else
+        # only PersonalSnippets can have discussions without project association
+        discussion = Note.find_discussion(discussion_id)
+        noteable = discussion.noteable
+
+        return nil unless noteable.is_a?(PersonalSnippet) && can?(current_user, :comment_personal_snippet, noteable)
+
+        discussion
+      end
+    end
   end
 end
diff --git a/app/services/notification_recipient_service.rb b/app/services/notification_recipient_service.rb
index 8bb995158de..988bd0a7cdb 100644
--- a/app/services/notification_recipient_service.rb
+++ b/app/services/notification_recipient_service.rb
@@ -19,9 +19,14 @@ class NotificationRecipientService
     # Re-assign is considered as a mention of the new assignee so we add the
     # new assignee to the list of recipients after we rejected users with
     # the "on mention" notification level
-    if [:reassign_merge_request, :reassign_issue].include?(custom_action)
+    case custom_action
+    when :reassign_merge_request
       recipients << previous_assignee if previous_assignee
       recipients << target.assignee
+    when :reassign_issue
+      previous_assignees = Array(previous_assignee)
+      recipients.concat(previous_assignees)
+      recipients.concat(target.assignees)
     end
 
     recipients = reject_muted_users(recipients)
diff --git a/app/services/notification_service.rb b/app/services/notification_service.rb
index 6b186263bd1..c65c66d7150 100644
--- a/app/services/notification_service.rb
+++ b/app/services/notification_service.rb
@@ -66,8 +66,25 @@ class NotificationService
   #  * issue new assignee if their notification level is not Disabled
   #  * users with custom level checked with "reassign issue"
   #
-  def reassigned_issue(issue, current_user)
-    reassign_resource_email(issue, issue.project, current_user, :reassigned_issue_email)
+  def reassigned_issue(issue, current_user, previous_assignees = [])
+    recipients = NotificationRecipientService.new(issue.project).build_recipients(
+      issue,
+      current_user,
+      action: "reassign",
+      previous_assignee: previous_assignees
+    )
+
+    previous_assignee_ids = previous_assignees.map(&:id)
+
+    recipients.each do |recipient|
+      mailer.send(
+        :reassigned_issue_email,
+        recipient.id,
+        issue.id,
+        previous_assignee_ids,
+        current_user.id
+      ).deliver_later
+    end
   end
 
   # When we add labels to an issue we should send an email to:
@@ -367,10 +384,10 @@ class NotificationService
   end
 
   def previous_record(object, attribute)
-    if object && attribute
-      if object.previous_changes.include?(attribute)
-        object.previous_changes[attribute].first
-      end
+    return unless object && attribute
+
+    if object.previous_changes.include?(attribute)
+      object.previous_changes[attribute].first
     end
   end
 end
diff --git a/app/services/projects/propagate_service_template.rb b/app/services/projects/propagate_service_template.rb
new file mode 100644
index 00000000000..a8ef2108492
--- /dev/null
+++ b/app/services/projects/propagate_service_template.rb
@@ -0,0 +1,103 @@
+module Projects
+  class PropagateServiceTemplate
+    BATCH_SIZE = 100
+
+    def self.propagate(*args)
+      new(*args).propagate
+    end
+
+    def initialize(template)
+      @template = template
+    end
+
+    def propagate
+      return unless @template.active?
+
+      Rails.logger.info("Propagating services for template #{@template.id}")
+
+      propagate_projects_with_template
+    end
+
+    private
+
+    def propagate_projects_with_template
+      loop do
+        batch = project_ids_batch
+
+        bulk_create_from_template(batch) unless batch.empty?
+
+        break if batch.size < BATCH_SIZE
+      end
+    end
+
+    def bulk_create_from_template(batch)
+      service_list = batch.map do |project_id|
+        service_hash.values << project_id
+      end
+
+      Project.transaction do
+        bulk_insert_services(service_hash.keys << 'project_id', service_list)
+        run_callbacks(batch)
+      end
+    end
+
+    def project_ids_batch
+      Project.connection.select_values(
+        <<-SQL
+          SELECT id
+          FROM projects
+          WHERE NOT EXISTS (
+            SELECT true
+            FROM services
+            WHERE services.project_id = projects.id
+            AND services.type = '#{@template.type}'
+          )
+          AND projects.pending_delete = false
+          AND projects.archived = false
+          LIMIT #{BATCH_SIZE}
+      SQL
+      )
+    end
+
+    def bulk_insert_services(columns, values_array)
+      ActiveRecord::Base.connection.execute(
+        <<-SQL.strip_heredoc
+          INSERT INTO services (#{columns.join(', ')})
+          VALUES #{values_array.map { |tuple| "(#{tuple.join(', ')})" }.join(', ')}
+      SQL
+      )
+    end
+
+    def service_hash
+      @service_hash ||=
+        begin
+          template_hash = @template.as_json(methods: :type).except('id', 'template', 'project_id')
+
+          template_hash.each_with_object({}) do |(key, value), service_hash|
+            value = value.is_a?(Hash) ? value.to_json : value
+
+            service_hash[ActiveRecord::Base.connection.quote_column_name(key)] =
+              ActiveRecord::Base.sanitize(value)
+          end
+        end
+    end
+
+    def run_callbacks(batch)
+      if active_external_issue_tracker?
+        Project.where(id: batch).update_all(has_external_issue_tracker: true)
+      end
+
+      if active_external_wiki?
+        Project.where(id: batch).update_all(has_external_wiki: true)
+      end
+    end
+
+    def active_external_issue_tracker?
+      @template.issue_tracker? && !@template.default
+    end
+
+    def active_external_wiki?
+      @template.type == 'ExternalWikiService'
+    end
+  end
+end
diff --git a/app/services/slash_commands/interpret_service.rb b/app/services/slash_commands/interpret_service.rb
index f1bbc7032d5..a7e13648b54 100644
--- a/app/services/slash_commands/interpret_service.rb
+++ b/app/services/slash_commands/interpret_service.rb
@@ -91,32 +91,47 @@ module SlashCommands
     end
 
     desc 'Assign'
-    explanation do |user|
-      "Assigns #{user.to_reference}." if user
+    explanation do |users|
+      "Assigns #{users.map(&:to_reference).to_sentence}." if users.any?
     end
     params '@user'
     condition do
       current_user.can?(:"admin_#{issuable.to_ability_name}", project)
     end
     parse_params do |assignee_param|
-      extract_references(assignee_param, :user).first ||
-        User.find_by(username: assignee_param)
+      users = extract_references(assignee_param, :user)
+
+      if users.empty?
+        users = User.where(username: assignee_param.split(' ').map(&:strip))
+      end
+
+      users
     end
-    command :assign do |user|
-      @updates[:assignee_id] = user.id if user
+    command :assign do |users|
+      next if users.empty?
+
+      if issuable.is_a?(Issue)
+        @updates[:assignee_ids] = users.map(&:id)
+      else
+        @updates[:assignee_id] = users.last.id
+      end
     end
 
     desc 'Remove assignee'
     explanation do
-      "Removes assignee #{issuable.assignee.to_reference}."
+      "Removes assignee #{issuable.assignees.first.to_reference}."
     end
     condition do
       issuable.persisted? &&
-        issuable.assignee_id? &&
+        issuable.assignees.any? &&
         current_user.can?(:"admin_#{issuable.to_ability_name}", project)
     end
     command :unassign do
-      @updates[:assignee_id] = nil
+      if issuable.is_a?(Issue)
+        @updates[:assignee_ids] = []
+      else
+        @updates[:assignee_id] = nil
+      end
     end
 
     desc 'Set milestone'
diff --git a/app/services/system_note_service.rb b/app/services/system_note_service.rb
index c9e25c7aaa2..174e7c6e95b 100644
--- a/app/services/system_note_service.rb
+++ b/app/services/system_note_service.rb
@@ -49,6 +49,44 @@ module SystemNoteService
     create_note(NoteSummary.new(noteable, project, author, body, action: 'assignee'))
   end
 
+  # Called when the assignees of an Issue is changed or removed
+  #
+  # issue - Issue object
+  # project  - Project owning noteable
+  # author   - User performing the change
+  # assignees - Users being assigned, or nil
+  #
+  # Example Note text:
+  #
+  #   "removed all assignees"
+  #
+  #   "assigned to @user1 additionally to @user2"
+  #
+  #   "assigned to @user1, @user2 and @user3 and unassigned from @user4 and @user5"
+  #
+  #   "assigned to @user1 and @user2"
+  #
+  # Returns the created Note object
+  def change_issue_assignees(issue, project, author, old_assignees)
+    body =
+      if issue.assignees.any? && old_assignees.any?
+        unassigned_users = old_assignees - issue.assignees
+        added_users = issue.assignees.to_a - old_assignees
+
+        text_parts = []
+        text_parts << "assigned to #{added_users.map(&:to_reference).to_sentence}" if added_users.any?
+        text_parts << "unassigned #{unassigned_users.map(&:to_reference).to_sentence}" if unassigned_users.any?
+
+        text_parts.join(' and ')
+      elsif old_assignees.any?
+        "removed all assignees"
+      elsif issue.assignees.any?
+        "assigned to #{issue.assignees.map(&:to_reference).to_sentence}"
+      end
+
+    create_note(NoteSummary.new(issue, project, author, body, action: 'assignee'))
+  end
+
   # Called when one or more labels on a Noteable are added and/or removed
   #
   # noteable       - Noteable object
@@ -261,6 +299,23 @@ module SystemNoteService
     create_note(NoteSummary.new(noteable, project, author, body, action: 'title'))
   end
 
+  # Called when the description of a Noteable is changed
+  #
+  # noteable  - Noteable object that responds to `description`
+  # project   - Project owning noteable
+  # author    - User performing the change
+  #
+  # Example Note text:
+  #
+  #   "changed the description"
+  #
+  # Returns the created Note object
+  def change_description(noteable, project, author)
+    body = 'changed the description'
+
+    create_note(NoteSummary.new(noteable, project, author, body, action: 'description'))
+  end
+
   # Called when the confidentiality changes
   #
   # issue   - Issue object
diff --git a/app/services/todo_service.rb b/app/services/todo_service.rb
index 8ae61694b50..322c6286365 100644
--- a/app/services/todo_service.rb
+++ b/app/services/todo_service.rb
@@ -251,9 +251,9 @@ class TodoService
   end
 
   def create_assignment_todo(issuable, author)
-    if issuable.assignee
+    if issuable.assignees.any?
       attributes = attributes_for_todo(issuable.project, issuable, author, Todo::ASSIGNED)
-      create_todos(issuable.assignee, attributes)
+      create_todos(issuable.assignees, attributes)
     end
   end
 
diff --git a/app/views/admin/application_settings/_form.html.haml b/app/views/admin/application_settings/_form.html.haml
index 0dc1103eece..4b6628169ef 100644
--- a/app/views/admin/application_settings/_form.html.haml
+++ b/app/views/admin/application_settings/_form.html.haml
@@ -394,8 +394,6 @@
 
   %fieldset
     %legend Error Reporting and Logging
-    %p
-      These settings require a restart to take effect.
     .form-group
       .col-sm-offset-2.col-sm-10
         .checkbox
@@ -403,6 +401,7 @@
             = f.check_box :sentry_enabled
             Enable Sentry
           .help-block
+            %p This setting requires a restart to take effect.
             Sentry is an error reporting and logging tool which is currently not shipped with GitLab, get it here:
             %a{ href: 'https://getsentry.com', target: '_blank', rel: 'noopener noreferrer' } https://getsentry.com
 
@@ -411,6 +410,21 @@
       .col-sm-10
         = f.text_field :sentry_dsn, class: 'form-control'
 
+    .form-group
+      .col-sm-offset-2.col-sm-10
+        .checkbox
+          = f.label :clientside_sentry_enabled do
+            = f.check_box :clientside_sentry_enabled
+            Enable Clientside Sentry
+          .help-block
+            Sentry can also be used for reporting and logging clientside exceptions.
+            %a{ href: 'https://sentry.io/for/javascript/', target: '_blank', rel: 'noopener noreferrer' } https://sentry.io/for/javascript/
+
+    .form-group
+      = f.label :clientside_sentry_dsn, 'Clientside Sentry DSN', class: 'control-label col-sm-2'
+      .col-sm-10
+        = f.text_field :clientside_sentry_dsn, class: 'form-control'
+
   %fieldset
     %legend Repository Storage
     .form-group
diff --git a/app/views/issues/_issue.atom.builder b/app/views/issues/_issue.atom.builder
index 23a88448055..2ed78bb3b65 100644
--- a/app/views/issues/_issue.atom.builder
+++ b/app/views/issues/_issue.atom.builder
@@ -23,10 +23,19 @@ xml.entry do
     end
   end
 
-  if issue.assignee
+  if issue.assignees.any?
+    xml.assignees do
+      issue.assignees.each do |assignee|
+        xml.assignee do
+          xml.name assignee.name
+          xml.email assignee.public_email
+        end
+      end
+    end
+
     xml.assignee do
-      xml.name issue.assignee.name
-      xml.email issue.assignee_public_email
+      xml.name issue.assignees.first.name
+      xml.email issue.assignees.first.public_email
     end
   end
 end
diff --git a/app/views/layouts/_head.html.haml b/app/views/layouts/_head.html.haml
index 19473b6ab27..afcc2b6e4f3 100644
--- a/app/views/layouts/_head.html.haml
+++ b/app/views/layouts/_head.html.haml
@@ -28,9 +28,12 @@
   = stylesheet_link_tag "application", media: "all"
   = stylesheet_link_tag "print",       media: "print"
 
+  = Gon::Base.render_data
+
   = webpack_bundle_tag "runtime"
   = webpack_bundle_tag "common"
   = webpack_bundle_tag "main"
+  = webpack_bundle_tag "raven" if current_application_settings.clientside_sentry_enabled
 
   - if content_for?(:page_specific_javascripts)
     = yield :page_specific_javascripts
diff --git a/app/views/layouts/application.html.haml b/app/views/layouts/application.html.haml
index dc926a615c7..7e011ac3e75 100644
--- a/app/views/layouts/application.html.haml
+++ b/app/views/layouts/application.html.haml
@@ -2,8 +2,6 @@
 %html{ lang: I18n.locale, class: "#{page_class}" }
   = render "layouts/head"
   %body{ class: @body_class, data: { page: body_data_page, project: "#{@project.path if @project}", group: "#{@group.path if @group}" } }
-    = Gon::Base.render_data
-
     = render "layouts/header/default", title: header_title
     = render 'layouts/page', sidebar: sidebar, nav: nav
 
diff --git a/app/views/layouts/devise.html.haml b/app/views/layouts/devise.html.haml
index 3368a9beb29..52fb46eb8c9 100644
--- a/app/views/layouts/devise.html.haml
+++ b/app/views/layouts/devise.html.haml
@@ -3,7 +3,6 @@
   = render "layouts/head"
   %body.ui_charcoal.login-page.application.navless{ data: { page: body_data_page } }
     .page-wrap
-      = Gon::Base.render_data
       = render "layouts/header/empty"
       = render "layouts/broadcast"
       .container.navless-container
diff --git a/app/views/layouts/devise_empty.html.haml b/app/views/layouts/devise_empty.html.haml
index 7466423a934..ed6731bde95 100644
--- a/app/views/layouts/devise_empty.html.haml
+++ b/app/views/layouts/devise_empty.html.haml
@@ -2,7 +2,6 @@
 %html{ lang: "en" }
   = render "layouts/head"
   %body.ui_charcoal.login-page.application.navless
-    = Gon::Base.render_data
     = render "layouts/header/empty"
     = render "layouts/broadcast"
     .container.navless-container
diff --git a/app/views/layouts/snippets.html.haml b/app/views/layouts/snippets.html.haml
index 02ca3ee7a28..98b75cea03f 100644
--- a/app/views/layouts/snippets.html.haml
+++ b/app/views/layouts/snippets.html.haml
@@ -1,3 +1,9 @@
 - header_title  "Snippets", snippets_path
 
+- content_for :page_specific_javascripts do
+  - if @snippet&.persisted? && current_user
+    :javascript
+      window.uploads_path = "#{upload_path('personal_snippet', @snippet)}";
+      window.preview_markdown_path = "#{preview_markdown_snippet_path(@snippet)}";
+
 = render template: "layouts/application"
diff --git a/app/views/notify/_reassigned_issuable_email.text.erb b/app/views/notify/_reassigned_issuable_email.text.erb
deleted file mode 100644
index daf20a226dd..00000000000
--- a/app/views/notify/_reassigned_issuable_email.text.erb
+++ /dev/null
@@ -1,6 +0,0 @@
-Reassigned <%= issuable.class.model_name.human.titleize %> <%= issuable.iid %>
-
-<%= url_for([issuable.project.namespace.becomes(Namespace), issuable.project, issuable, { only_path: false }]) %>
-
-Assignee changed <%= "from #{@previous_assignee.name}" if @previous_assignee -%>
- to <%= "#{issuable.assignee_id ? issuable.assignee_name : 'Unassigned'}" %>
diff --git a/app/views/notify/new_issue_email.html.haml b/app/views/notify/new_issue_email.html.haml
index c762578971a..eb5157ccac9 100644
--- a/app/views/notify/new_issue_email.html.haml
+++ b/app/views/notify/new_issue_email.html.haml
@@ -2,9 +2,9 @@
   %p.details
     #{link_to @issue.author_name, user_url(@issue.author)} created an issue:
 
-- if @issue.assignee_id.present?
+- if @issue.assignees.any?
   %p
-    Assignee: #{@issue.assignee_name}
+    Assignee: #{@issue.assignee_list}
 
 - if @issue.description
   %div
diff --git a/app/views/notify/new_issue_email.text.erb b/app/views/notify/new_issue_email.text.erb
index ca5c2f2688c..13f1ac08e94 100644
--- a/app/views/notify/new_issue_email.text.erb
+++ b/app/views/notify/new_issue_email.text.erb
@@ -2,6 +2,6 @@ New Issue was created.
 
 Issue <%= @issue.iid %>: <%= url_for(namespace_project_issue_url(@issue.project.namespace, @issue.project, @issue)) %>
 Author:    <%= @issue.author_name %>
-Assignee:  <%= @issue.assignee_name %>
+Assignee:  <%= @issue.assignee_list %>
 
 <%= @issue.description %>
diff --git a/app/views/notify/new_mention_in_issue_email.text.erb b/app/views/notify/new_mention_in_issue_email.text.erb
index 457e94b4800..f19ac3adfc7 100644
--- a/app/views/notify/new_mention_in_issue_email.text.erb
+++ b/app/views/notify/new_mention_in_issue_email.text.erb
@@ -2,6 +2,6 @@ You have been mentioned in an issue.
 
 Issue <%= @issue.iid %>: <%= url_for(namespace_project_issue_url(@issue.project.namespace, @issue.project, @issue)) %>
 Author:    <%= @issue.author_name %>
-Assignee:  <%= @issue.assignee_name %>
+Assignee:  <%= @issue.assignee_list %>
 
 <%= @issue.description %>
diff --git a/app/views/notify/reassigned_issue_email.html.haml b/app/views/notify/reassigned_issue_email.html.haml
index 498ba8b8365..ee2f40e1683 100644
--- a/app/views/notify/reassigned_issue_email.html.haml
+++ b/app/views/notify/reassigned_issue_email.html.haml
@@ -1 +1,10 @@
-= render 'reassigned_issuable_email', issuable: @issue
+%p
+  Assignee changed
+  - if @previous_assignees.any?
+    from
+    %strong= @previous_assignees.map(&:name).to_sentence
+  to
+  - if @issue.assignees.any?
+    %strong= @issue.assignee_list
+  - else
+    %strong Unassigned
diff --git a/app/views/notify/reassigned_issue_email.text.erb b/app/views/notify/reassigned_issue_email.text.erb
index 710253be984..6c357f1074a 100644
--- a/app/views/notify/reassigned_issue_email.text.erb
+++ b/app/views/notify/reassigned_issue_email.text.erb
@@ -1 +1,6 @@
-<%= render 'reassigned_issuable_email', issuable: @issue %>
+Reassigned Issue <%= @issue.iid %>
+
+<%= url_for([@issue.project.namespace.becomes(Namespace), @issue.project, @issue, { only_path: false }]) %>
+
+Assignee changed <%= "from #{@previous_assignees.map(&:name).to_sentence}" if @previous_assignees.any? -%>
+ to <%= "#{@issue.assignees.any? ? @issue.assignee_list : 'Unassigned'}" %>
diff --git a/app/views/notify/reassigned_merge_request_email.html.haml b/app/views/notify/reassigned_merge_request_email.html.haml
index 2a650130f59..841df872857 100644
--- a/app/views/notify/reassigned_merge_request_email.html.haml
+++ b/app/views/notify/reassigned_merge_request_email.html.haml
@@ -1 +1,9 @@
-= render 'reassigned_issuable_email', issuable: @merge_request
+Reassigned Merge Request #{ @merge_request.iid }
+
+= url_for([@merge_request.project.namespace.becomes(Namespace), @merge_request.project, @merge_request, { only_path: false }])
+
+Assignee changed
+- if @previous_assignee
+  from #{@previous_assignee.name}
+to
+= @merge_request.assignee_id ? @merge_request.assignee_name : 'Unassigned'
diff --git a/app/views/notify/reassigned_merge_request_email.text.erb b/app/views/notify/reassigned_merge_request_email.text.erb
index b5b4f1ff99a..998a40fefde 100644
--- a/app/views/notify/reassigned_merge_request_email.text.erb
+++ b/app/views/notify/reassigned_merge_request_email.text.erb
@@ -1 +1,6 @@
-<%= render 'reassigned_issuable_email', issuable: @merge_request %>
+Reassigned Merge Request <%= @merge_request.iid %>
+
+<%= url_for([@merge_request.project.namespace.becomes(Namespace), @merge_request.project, @merge_request, { only_path: false }]) %>
+
+Assignee changed <%= "from #{@previous_assignee.name}" if @previous_assignee -%>
+ to <%= "#{@merge_request.assignee_id ? @merge_request.assignee_name : 'Unassigned'}" %>
diff --git a/app/views/projects/blob/viewers/_balsamiq.html.haml b/app/views/projects/blob/viewers/_balsamiq.html.haml
new file mode 100644
index 00000000000..28670e7de97
--- /dev/null
+++ b/app/views/projects/blob/viewers/_balsamiq.html.haml
@@ -0,0 +1,4 @@
+- content_for :page_specific_javascripts do
+  = page_specific_javascript_bundle_tag('balsamiq_viewer')
+
+.file-content.balsamiq-viewer#js-balsamiq-viewer{ data: { endpoint: blob_raw_url } }
diff --git a/app/views/projects/boards/components/_board.html.haml b/app/views/projects/boards/components/_board.html.haml
index 5a4eaf92b16..bc5c727bf0d 100644
--- a/app/views/projects/boards/components/_board.html.haml
+++ b/app/views/projects/boards/components/_board.html.haml
@@ -13,8 +13,8 @@
             %button.btn.btn-small.btn-default.pull-right.has-tooltip{ type: "button",
               "@click" => "showNewIssueForm",
               "v-if" => 'list.type !== "closed"',
-              "aria-label" => "Add an issue",
-              "title" => "Add an issue",
+              "aria-label" => "New issue",
+              "title" => "New issue",
               data: { placement: "top", container: "body" } }
               = icon("plus")
         - if can?(current_user, :admin_list, @project)
diff --git a/app/views/projects/boards/components/sidebar/_assignee.html.haml b/app/views/projects/boards/components/sidebar/_assignee.html.haml
index 0f424334521..642da679f97 100644
--- a/app/views/projects/boards/components/sidebar/_assignee.html.haml
+++ b/app/views/projects/boards/components/sidebar/_assignee.html.haml
@@ -1,40 +1,28 @@
-.block.assignee
-  .title.hide-collapsed
-    Assignee
-    - if can?(current_user, :admin_issue, @project)
-      = icon("spinner spin", class: "block-loading")
-      = link_to "Edit", "#", class: "edit-link pull-right"
-  .value.hide-collapsed
-    %span.assign-yourself.no-value{ "v-if" => "!issue.assignee" }
-      No assignee
-      - if can?(current_user, :admin_issue, @project)
-        \-
-        %a.js-assign-yourself{ href: "#" }
-          assign yourself
-    %a.author_link.bold{ ":href" => "'#{root_url}' + issue.assignee.username",
-      "v-if" => "issue.assignee" }
-      %img.avatar.avatar-inline.s32{ ":src" => "issue.assignee.avatar",
-        width: "32", alt: "Avatar" }
-      %span.author
-        {{ issue.assignee.name }}
-      %span.username
-        = precede "@" do
-          {{ issue.assignee.username }}
+.block.assignee{ ref: "assigneeBlock" }
+  %template{ "v-if" => "issue.assignees" }
+    %assignee-title{ ":number-of-assignees" => "issue.assignees.length",
+      ":loading" => "loadingAssignees",
+      ":editable" => can?(current_user, :admin_issue, @project) }
+    %assignees.value{ "root-path" => "#{root_url}",
+      ":users" => "issue.assignees",
+      ":editable" => can?(current_user, :admin_issue, @project),
+      "@assign-self" => "assignSelf" }
+
   - if can?(current_user, :admin_issue, @project)
     .selectbox.hide-collapsed
       %input{ type: "hidden",
-        name: "issue[assignee_id]",
-        id: "issue_assignee_id",
-        ":value" => "issue.assignee.id",
-        "v-if" => "issue.assignee" }
+        name: "issue[assignee_ids][]",
+        ":value" => "assignee.id",
+        "v-if" => "issue.assignees",
+        "v-for" => "assignee in issue.assignees" }
       .dropdown
-        %button.dropdown-menu-toggle.js-user-search.js-author-search.js-issue-board-sidebar{ type: "button", data: { toggle: "dropdown", field_name: "issue[assignee_id]", first_user: (current_user.username if current_user), current_user: "true", project_id: @project.id, null_user: "true", null_user_default: "true" },
+        %button.dropdown-menu-toggle.js-user-search.js-author-search.js-multiselect.js-save-user-data.js-issue-board-sidebar{ type: "button", ref: "assigneeDropdown", data: { toggle: "dropdown", field_name: "issue[assignee_ids][]", first_user: (current_user.username if current_user), current_user: "true", project_id: @project.id, null_user: "true", multi_select: "true", 'max-select' => 1, dropdown: { header: 'Assignee' } },
           ":data-issuable-id" => "issue.id",
           ":data-selected" => "assigneeId",
           ":data-issue-update" => "'#{namespace_project_issues_path(@project.namespace, @project)}/' + issue.id + '.json'" }
           Select assignee
           = icon("chevron-down")
-        .dropdown-menu.dropdown-menu-user.dropdown-menu-selectable.dropdown-menu-author
+        .dropdown-menu.dropdown-select.dropdown-menu-user.dropdown-menu-selectable.dropdown-menu-author
           = dropdown_title("Assign to")
           = dropdown_filter("Search users")
           = dropdown_content
diff --git a/app/views/projects/commit/show.html.haml b/app/views/projects/commit/show.html.haml
index 16d2646cb4e..6051ea2f1ce 100644
--- a/app/views/projects/commit/show.html.haml
+++ b/app/views/projects/commit/show.html.haml
@@ -13,7 +13,7 @@
     .block-connector
   = render "projects/diffs/diffs", diffs: @diffs, environment: @environment
 
-  = render "projects/notes/notes_with_form"
+  = render "shared/notes/notes_with_form"
   - if can_collaborate_with_project?
     - %w(revert cherry-pick).each do |type|
       = render "projects/commit/change", type: type, commit: @commit, title: @commit.title
diff --git a/app/views/projects/cycle_analytics/show.html.haml b/app/views/projects/cycle_analytics/show.html.haml
index 819f29d3ca5..b158a81471c 100644
--- a/app/views/projects/cycle_analytics/show.html.haml
+++ b/app/views/projects/cycle_analytics/show.html.haml
@@ -9,17 +9,17 @@
 
 #cycle-analytics{ class: container_class, "v-cloak" => "true", data: { request_path: project_cycle_analytics_path(@project) } }
   - if @cycle_analytics_no_data
-    .bordered-box.landing.content-block{ "v-if" => "!isOverviewDialogDismissed" }
-      = icon("times", class: "dismiss-icon", "@click" => "dismissOverviewDialog()")
-      .row
-        .col-sm-3.col-xs-12.svg-container
-          = custom_icon('icon_cycle_analytics_splash')
-        .col-sm-8.col-xs-12.inner-content
-          %h4
-            {{ __('Introducing Cycle Analytics') }}
-          %p
-            {{ __('Cycle Analytics gives an overview of how much time it takes to go from idea to production in your project.') }}
-
+    .landing.content-block{ "v-if" => "!isOverviewDialogDismissed" }
+      %button.dismiss-button{ type: 'button', 'aria-label': 'Dismiss Cycle Analytics introduction box' }
+        = icon("times", "@click" => "dismissOverviewDialog()")
+      .svg-container
+        = custom_icon('icon_cycle_analytics_splash')
+      .inner-content
+        %h4
+          {{ __('Introducing Cycle Analytics') }}
+        %p
+          {{ __('Cycle Analytics gives an overview of how much time it takes to go from idea to production in your project.') }}
+        %p
           = link_to _('Read more'), help_page_path('user/project/cycle_analytics'), target: '_blank', class: 'btn'
   = icon("spinner spin", "v-show" => "isLoading")
   .wrapper{ "v-show" => "!isLoading && !hasError" }
diff --git a/app/views/projects/environments/terminal.html.haml b/app/views/projects/environments/terminal.html.haml
index c8363087d6a..4c4aa0baff3 100644
--- a/app/views/projects/environments/terminal.html.haml
+++ b/app/views/projects/environments/terminal.html.haml
@@ -16,8 +16,9 @@
 
       .col-sm-6
         .nav-controls
-          = link_to @environment.external_url, class: 'btn btn-default', target: '_blank', rel: 'noopener noreferrer nofollow' do
-            = icon('external-link')
+          - if @environment.external_url.present?
+            = link_to @environment.external_url, class: 'btn btn-default', target: '_blank', rel: 'noopener noreferrer nofollow' do
+              = icon('external-link')
           = render 'projects/deployments/actions', deployment: @environment.last_deployment
 
 .terminal-container{ class: container_class }
diff --git a/app/views/projects/group_links/_index.html.haml b/app/views/projects/group_links/_index.html.haml
index b6116dbec41..debb0214d06 100644
--- a/app/views/projects/group_links/_index.html.haml
+++ b/app/views/projects/group_links/_index.html.haml
@@ -6,11 +6,9 @@
     %p
       Projects can be stored in only one group at once. However you can share a project with other groups here.
   .col-lg-9
-    %h5.prepend-top-0
-      Set a group to share
     = form_tag namespace_project_group_links_path(@project.namespace, @project), class: 'js-requires-input', method: :post do
       .form-group
-        = label_tag :link_group_id, "Group", class: "label-light"
+        = label_tag :link_group_id, "Select a group to share with", class: "label-light"
         = groups_select_tag(:link_group_id, data: { skip_groups: @skip_groups }, required: true)
       .form-group
         = label_tag :link_group_access, "Max access level", class: "label-light"
diff --git a/app/views/projects/issues/_discussion.html.haml b/app/views/projects/issues/_discussion.html.haml
index 5d4e593e4ef..4dfda54feb5 100644
--- a/app/views/projects/issues/_discussion.html.haml
+++ b/app/views/projects/issues/_discussion.html.haml
@@ -4,4 +4,4 @@
     = link_to 'Close issue', issue_path(@issue, issue: {state_event: :close}, format: 'json'), data: {no_turbolink: true, original_text: "Close issue", alternative_text: "Comment & close issue"}, class: "btn btn-nr btn-close btn-comment js-note-target-close #{issue_button_visibility(@issue, true)}", title: 'Close issue'
 
 #notes
-  = render 'projects/notes/notes_with_form'
+  = render 'shared/notes/notes_with_form'
diff --git a/app/views/projects/issues/_issue.html.haml b/app/views/projects/issues/_issue.html.haml
index 0e3902c066a..c184e0e0022 100644
--- a/app/views/projects/issues/_issue.html.haml
+++ b/app/views/projects/issues/_issue.html.haml
@@ -13,9 +13,9 @@
             %li
               CLOSED
 
-          - if issue.assignee
+          - if issue.assignees.any?
             %li
-              = link_to_member(@project, issue.assignee, name: false, title: "Assigned to :name")
+              = render 'shared/issuable/assignees', project: @project, issue: issue
 
           = render 'shared/issuable_meta_data', issuable: issue
 
diff --git a/app/views/projects/issues/show.html.haml b/app/views/projects/issues/show.html.haml
index 1418ad73553..9084883eb3e 100644
--- a/app/views/projects/issues/show.html.haml
+++ b/app/views/projects/issues/show.html.haml
@@ -51,16 +51,11 @@
 
 .issue-details.issuable-details
   .detail-page-description.content-block
-    .issue-title-data.hidden{ "data" => { "initial-title" => markdown_field(@issue, :title),
-      "endpoint" => rendered_title_namespace_project_issue_path(@project.namespace, @project, @issue),
+    .issue-title-data.hidden{ "data" => { "endpoint" => rendered_title_namespace_project_issue_path(@project.namespace, @project, @issue),
+      "can-update-tasks-class" => can?(current_user, :update_issue, @issue) ? 'js-task-list-container' : '',
     } }
     .issue-title-entrypoint
-    - if @issue.description.present?
-      .description{ class: can?(current_user, :update_issue, @issue) ? 'js-task-list-container' : '' }
-        .wiki
-          = markdown_field(@issue, :description)
-        %textarea.hidden.js-task-list-field
-          = @issue.description
+
     = edited_time_ago_with_tooltip(@issue, placement: 'bottom', html_class: 'issue_edited_ago')
 
     #merge-requests{ data: { url: referenced_merge_requests_namespace_project_issue_url(@project.namespace, @project, @issue) } }
diff --git a/app/views/projects/merge_requests/_discussion.html.haml b/app/views/projects/merge_requests/_discussion.html.haml
index 15b5a51c1d0..2e6420db212 100644
--- a/app/views/projects/merge_requests/_discussion.html.haml
+++ b/app/views/projects/merge_requests/_discussion.html.haml
@@ -8,4 +8,4 @@
     %button.btn.btn-nr.btn-default.append-right-10.js-comment-resolve-button{ "v-if" => "showButton", type: "submit", data: { project_path: "#{project_path(@merge_request.project)}" } }
       {{ buttonText }}
 
-#notes= render "projects/notes/notes_with_form"
+#notes= render "shared/notes/notes_with_form"
diff --git a/app/views/projects/milestones/_form.html.haml b/app/views/projects/milestones/_form.html.haml
index 2e978fda624..9a95b2a82ff 100644
--- a/app/views/projects/milestones/_form.html.haml
+++ b/app/views/projects/milestones/_form.html.haml
@@ -11,7 +11,7 @@
         .col-sm-10
           = render layout: 'projects/md_preview', locals: { url: preview_markdown_path(@project) } do
             = render 'projects/zen', f: f, attr: :description, classes: 'note-textarea', placeholder: 'Write milestone description...'
-            = render 'projects/notes/hints'
+            = render 'shared/notes/hints'
           .clearfix
           .error-alert
     = render "shared/milestones/form_dates", f: f
diff --git a/app/views/projects/notes/_edit.html.haml b/app/views/projects/notes/_edit.html.haml
deleted file mode 100644
index f1e251d65b7..00000000000
--- a/app/views/projects/notes/_edit.html.haml
+++ /dev/null
@@ -1,3 +0,0 @@
-.original-note-content.hidden{ data: { post_url: namespace_project_note_path(@project.namespace, @project, note), target_id: note.noteable.id, target_type: note.noteable.class.name.underscore } }
-  #{note.note}
-%textarea.hidden.js-task-list-field.original-task-list{ data: {update_url: namespace_project_note_path(@project.namespace, @project, note) } }= note.note
diff --git a/app/views/projects/pipelines/_with_tabs.html.haml b/app/views/projects/pipelines/_with_tabs.html.haml
index d7cefb8613e..1aa48bf9813 100644
--- a/app/views/projects/pipelines/_with_tabs.html.haml
+++ b/app/views/projects/pipelines/_with_tabs.html.haml
@@ -1,3 +1,5 @@
+- failed_builds = @pipeline.statuses.latest.failed
+
 .tabs-holder
   %ul.pipelines-tabs.nav-links.no-top.no-bottom
     %li.js-pipeline-tab-link
@@ -7,8 +9,11 @@
       = link_to builds_namespace_project_pipeline_path(@project.namespace, @project, @pipeline), data: {target: 'div#js-tab-builds', action: 'builds', toggle: 'tab' }, class: 'builds-tab' do
         Jobs
         %span.badge.js-builds-counter= pipeline.statuses.count
-
-
+    - if failed_builds.present?
+      %li.js-failures-tab-link
+        = link_to failures_namespace_project_pipeline_path(@project.namespace, @project, @pipeline), data: {target: 'div#js-tab-failures', action: 'failures', toggle: 'tab' }, class: 'failures-tab' do
+          Failed Jobs
+          %span.badge.js-failures-counter= failed_builds.count
 
 .tab-content
   #js-tab-pipeline.tab-pane
@@ -39,3 +44,13 @@
             %th Coverage
             %th
         = render partial: "projects/stage/stage", collection: pipeline.stages, as: :stage
+  - if failed_builds.present?
+    #js-tab-failures.build-failures.tab-pane
+      - failed_builds.each_with_index do |build, index|
+        .build-state
+          %span.ci-status-icon-failed= custom_icon('icon_status_failed')
+          %span.stage
+            = build.stage.titleize
+          %span.build-name
+            = link_to build.name, pipeline_build_url(pipeline, build)
+        %pre.build-log= build_summary(build, skip: index >= 10)
diff --git a/app/views/projects/project_members/_index.html.haml b/app/views/projects/project_members/_index.html.haml
index f83521052ed..d080b6c83d4 100644
--- a/app/views/projects/project_members/_index.html.haml
+++ b/app/views/projects/project_members/_index.html.haml
@@ -18,7 +18,7 @@
         = render "projects/project_members/new_project_member"
 
         = render 'shared/members/requests', membership_source: @project, requesters: @requesters
-        .append-bottom-default.clearfix
+        .clearfix
           %h5.member.existing-title
             Existing members and groups
         - if @group_links.any?
diff --git a/app/views/projects/protected_branches/_create_protected_branch.html.haml b/app/views/projects/protected_branches/_create_protected_branch.html.haml
index b8e885b4d9a..99bc2516366 100644
--- a/app/views/projects/protected_branches/_create_protected_branch.html.haml
+++ b/app/views/projects/protected_branches/_create_protected_branch.html.haml
@@ -25,7 +25,7 @@
             .merge_access_levels-container
               = dropdown_tag('Select',
                              options: { toggle_class: 'js-allowed-to-merge wide',
-                             dropdown_class: 'dropdown-menu-selectable',
+                             dropdown_class: 'dropdown-menu-selectable capitalize-header',
                              data: { field_name: 'protected_branch[merge_access_levels_attributes][0][access_level]', input_id: 'merge_access_levels_attributes' }})
         .form-group
           %label.col-md-2.text-right{ for: 'push_access_levels_attributes' }
@@ -34,7 +34,7 @@
             .push_access_levels-container
               = dropdown_tag('Select',
                              options: { toggle_class: 'js-allowed-to-push wide',
-                             dropdown_class: 'dropdown-menu-selectable',
+                             dropdown_class: 'dropdown-menu-selectable capitalize-header',
                              data: { field_name: 'protected_branch[push_access_levels_attributes][0][access_level]', input_id: 'push_access_levels_attributes' }})
 
     .panel-footer
diff --git a/app/views/projects/protected_branches/_update_protected_branch.html.haml b/app/views/projects/protected_branches/_update_protected_branch.html.haml
index d6044aacaec..c61b2951e1e 100644
--- a/app/views/projects/protected_branches/_update_protected_branch.html.haml
+++ b/app/views/projects/protected_branches/_update_protected_branch.html.haml
@@ -1,10 +1,10 @@
 %td
   = hidden_field_tag "allowed_to_merge_#{protected_branch.id}", protected_branch.merge_access_levels.first.access_level
   = dropdown_tag( (protected_branch.merge_access_levels.first.humanize || 'Select') ,
-                 options: { toggle_class: 'js-allowed-to-merge', dropdown_class: 'dropdown-menu-selectable js-allowed-to-merge-container',
+                 options: { toggle_class: 'js-allowed-to-merge', dropdown_class: 'dropdown-menu-selectable js-allowed-to-merge-container capitalize-header',
                  data: { field_name: "allowed_to_merge_#{protected_branch.id}", access_level_id: protected_branch.merge_access_levels.first.id }})
 %td
   = hidden_field_tag "allowed_to_push_#{protected_branch.id}", protected_branch.push_access_levels.first.access_level
   = dropdown_tag( (protected_branch.push_access_levels.first.humanize || 'Select') ,
-                 options: { toggle_class: 'js-allowed-to-push', dropdown_class: 'dropdown-menu-selectable js-allowed-to-push-container',
+                 options: { toggle_class: 'js-allowed-to-push', dropdown_class: 'dropdown-menu-selectable js-allowed-to-push-container capitalize-header',
                  data: { field_name: "allowed_to_push_#{protected_branch.id}", access_level_id: protected_branch.push_access_levels.first.id }})
diff --git a/app/views/projects/protected_tags/_dropdown.html.haml b/app/views/projects/protected_tags/_dropdown.html.haml
index 74851519077..c50515cfe06 100644
--- a/app/views/projects/protected_tags/_dropdown.html.haml
+++ b/app/views/projects/protected_tags/_dropdown.html.haml
@@ -2,7 +2,7 @@
 
 = dropdown_tag('Select tag or create wildcard',
                options: { toggle_class: 'js-protected-tag-select js-filter-submit wide',
-                          filter: true, dropdown_class: "dropdown-menu-selectable", placeholder: "Search protected tag",
+                          filter: true, dropdown_class: "dropdown-menu-selectable  capitalize-header", placeholder: "Search protected tag",
                           footer_content: true,
                           data: { show_no: true, show_any: true, show_upcoming: true,
                                   selected: params[:protected_tag_name],
diff --git a/app/views/projects/protected_tags/_update_protected_tag.haml b/app/views/projects/protected_tags/_update_protected_tag.haml
index 62823bee46e..cc80bd04dd0 100644
--- a/app/views/projects/protected_tags/_update_protected_tag.haml
+++ b/app/views/projects/protected_tags/_update_protected_tag.haml
@@ -1,5 +1,5 @@
 %td
   = hidden_field_tag "allowed_to_create_#{protected_tag.id}", protected_tag.create_access_levels.first.access_level
   = dropdown_tag( (protected_tag.create_access_levels.first.humanize || 'Select') ,
-                 options: { toggle_class: 'js-allowed-to-create', dropdown_class: 'dropdown-menu-selectable js-allowed-to-create-container',
+                 options: { toggle_class: 'js-allowed-to-create', dropdown_class: 'dropdown-menu-selectable capitalize-header js-allowed-to-create-container',
                  data: { field_name: "allowed_to_create_#{protected_tag.id}", access_level_id: protected_tag.create_access_levels.first.id }})
diff --git a/app/views/projects/releases/edit.html.haml b/app/views/projects/releases/edit.html.haml
index faa24a3c88e..93ee9382a6e 100644
--- a/app/views/projects/releases/edit.html.haml
+++ b/app/views/projects/releases/edit.html.haml
@@ -13,7 +13,7 @@
   = form_for(@release, method: :put, url: namespace_project_tag_release_path(@project.namespace, @project, @tag.name), html: { class: 'form-horizontal common-note-form release-form js-quick-submit' }) do |f|
     = render layout: 'projects/md_preview', locals: { url: preview_markdown_path(@project), referenced_users: true } do
       = render 'projects/zen', f: f, attr: :description, classes: 'note-textarea', placeholder: "Write your release notes or drag files here..."
-      = render 'projects/notes/hints'
+      = render 'shared/notes/hints'
     .error-alert
     .prepend-top-default
       = f.submit 'Save changes', class: 'btn btn-save'
diff --git a/app/views/projects/snippets/show.html.haml b/app/views/projects/snippets/show.html.haml
index 7a175f63eeb..aab1c043e66 100644
--- a/app/views/projects/snippets/show.html.haml
+++ b/app/views/projects/snippets/show.html.haml
@@ -9,4 +9,4 @@
   .row-content-block.top-block.content-component-block
     = render 'award_emoji/awards_block', awardable: @snippet, inline: true
 
-  #notes= render "projects/notes/notes_with_form"
+  #notes= render "shared/notes/notes_with_form"
diff --git a/app/views/projects/tags/new.html.haml b/app/views/projects/tags/new.html.haml
index a6894b9adc0..7c607d2956b 100644
--- a/app/views/projects/tags/new.html.haml
+++ b/app/views/projects/tags/new.html.haml
@@ -30,7 +30,7 @@
     .col-sm-10
       = render layout: 'projects/md_preview', locals: { url: preview_markdown_path(@project), referenced_users: true } do
         = render 'projects/zen', attr: :release_description, classes: 'note-textarea', placeholder: "Write your release notes or drag files here..."
-        = render 'projects/notes/hints'
+        = render 'shared/notes/hints'
       .help-block Optionally, add release notes to the tag. They will be stored in the GitLab database and displayed on the tags page.
   .form-actions
     = button_tag 'Create tag', class: 'btn btn-create', tabindex: 3
diff --git a/app/views/projects/wikis/_form.html.haml b/app/views/projects/wikis/_form.html.haml
index 00869aff27b..6cb7c1e9c4d 100644
--- a/app/views/projects/wikis/_form.html.haml
+++ b/app/views/projects/wikis/_form.html.haml
@@ -14,7 +14,7 @@
     .col-sm-10
       = render layout: 'projects/md_preview', locals: { url: namespace_project_wiki_preview_markdown_path(@project.namespace, @project, @page.slug) } do
         = render 'projects/zen', f: f, attr: :content, classes: 'note-textarea', placeholder: 'Write your content or drag files here...'
-        = render 'projects/notes/hints'
+        = render 'shared/notes/hints'
 
       .clearfix
       .error-alert
diff --git a/app/views/shared/issuable/_assignees.html.haml b/app/views/shared/issuable/_assignees.html.haml
new file mode 100644
index 00000000000..36bbb1148d4
--- /dev/null
+++ b/app/views/shared/issuable/_assignees.html.haml
@@ -0,0 +1,15 @@
+- max_render = 3
+- max = [max_render, issue.assignees.length].min
+
+- issue.assignees.each_with_index do |assignee, index|
+  - if index < max
+    = link_to_member(@project, assignee, name: false, title: "Assigned to :name")
+
+- if issue.assignees.length > max_render
+  - counter = issue.assignees.length - max_render
+
+  %span{ class: 'avatar-counter has-tooltip', data: { container: 'body', placement: 'bottom', 'line-type' => 'old', 'original-title' => "+#{counter} more assignees" } }
+    - if counter < 99
+      = "+#{counter}"
+    - else
+      99+
diff --git a/app/views/shared/issuable/_participants.html.haml b/app/views/shared/issuable/_participants.html.haml
index 171da899937..db407363a09 100644
--- a/app/views/shared/issuable/_participants.html.haml
+++ b/app/views/shared/issuable/_participants.html.haml
@@ -12,9 +12,9 @@
     - participants.each do |participant|
       .participants-author.js-participants-author
         = link_to_member(@project, participant, name: false, size: 24)
-    - if participants_extra > 0
-      .participants-more
-        %a.js-participants-more{ href: "#", data: { original_text: "+ #{participants_size - 7} more", less_text: "- show less" } }
-          + #{participants_extra} more
+  - if participants_extra > 0
+    .hide-collapsed.participants-more
+      %a.js-participants-more{ href: "#", data: { original_text: "+ #{participants_size - 7} more", less_text: "- show less" } }
+        + #{participants_extra} more
 :javascript
   IssuableContext.prototype.PARTICIPANTS_ROW_COUNT = #{participants_row};
diff --git a/app/views/shared/issuable/_search_bar.html.haml b/app/views/shared/issuable/_search_bar.html.haml
index b6fce5e3cd4..f7b87171573 100644
--- a/app/views/shared/issuable/_search_bar.html.haml
+++ b/app/views/shared/issuable/_search_bar.html.haml
@@ -124,8 +124,13 @@
                 %li
                   %a{ href: "#", data: { id: "close" } } Closed
           .filter-item.inline
+            - if type == :issues
+              - field_name = "update[assignee_ids][]"
+            - else
+              - field_name = "update[assignee_id]"
+
             = dropdown_tag("Assignee", options: { toggle_class: "js-user-search js-update-assignee js-filter-submit js-filter-bulk-update", title: "Assign to", filter: true, dropdown_class: "dropdown-menu-user dropdown-menu-selectable",
-              placeholder: "Search authors", data: { first_user: (current_user.username if current_user), null_user: true, current_user: true, project_id: @project.id, field_name: "update[assignee_id]", default_label: "Assignee" } })
+              placeholder: "Search authors", data: { first_user: (current_user.username if current_user), null_user: true, current_user: true, project_id: @project.id, field_name: field_name } })
           .filter-item.inline
             = dropdown_tag("Milestone", options: { title: "Assign milestone", toggle_class: 'js-milestone-select js-extra-options js-filter-submit js-filter-bulk-update', filter: true, dropdown_class: "dropdown-menu-selectable dropdown-menu-milestone", placeholder: "Search milestones", data: { show_no: true, field_name: "update[milestone_id]", project_id: @project.id, milestones: namespace_project_milestones_path(@project.namespace, @project, :json), use_id: true, default_label: "Milestone" } })
           .filter-item.inline.labels-filter
diff --git a/app/views/shared/issuable/_sidebar.html.haml b/app/views/shared/issuable/_sidebar.html.haml
index bc638e994f3..44e624c15a7 100644
--- a/app/views/shared/issuable/_sidebar.html.haml
+++ b/app/views/shared/issuable/_sidebar.html.haml
@@ -1,10 +1,10 @@
 - todo = issuable_todo(issuable)
 - content_for :page_specific_javascripts do
   = page_specific_javascript_bundle_tag('common_vue')
-  = page_specific_javascript_bundle_tag('issuable')
+  = page_specific_javascript_bundle_tag('sidebar')
 
 %aside.right-sidebar.js-right-sidebar{ data: { "offset-top" => "102", "spy" => "affix" }, class: sidebar_gutter_collapsed_class, 'aria-live' => 'polite' }
-  .issuable-sidebar
+  .issuable-sidebar{ data: { endpoint: "#{issuable_json_path(issuable)}" } }
     - can_edit_issuable = can?(current_user, :"admin_#{issuable.to_ability_name}", @project)
     .block.issuable-sidebar-header
       - if current_user
@@ -20,36 +20,55 @@
         .block.todo.hide-expanded
           = render "shared/issuable/sidebar_todo", todo: todo, issuable: issuable, is_collapsed: true
       .block.assignee
-        .sidebar-collapsed-icon.sidebar-collapsed-user{ data: { toggle: "tooltip", placement: "left", container: "body" }, title: (issuable.assignee.name if issuable.assignee) }
-          - if issuable.assignee
-            = link_to_member(@project, issuable.assignee, size: 24)
-          - else
-            = icon('user', 'aria-hidden': 'true')
-        .title.hide-collapsed
-          Assignee
-          = icon('spinner spin', class: 'hidden block-loading', 'aria-hidden': 'true')
-          - if can_edit_issuable
-            = link_to 'Edit', '#', class: 'edit-link pull-right'
-        .value.hide-collapsed
-          - if issuable.assignee
-            = link_to_member(@project, issuable.assignee, size: 32, extra_class: 'bold') do
-              - if issuable.instance_of?(MergeRequest) && !issuable.can_be_merged_by?(issuable.assignee)
-                %span.pull-right.cannot-be-merged{ data: { toggle: 'tooltip', placement: 'left' }, title: 'Not allowed to merge' }
-                  = icon('exclamation-triangle', 'aria-hidden': 'true')
-              %span.username
-                = issuable.assignee.to_reference
-          - else
-            %span.assign-yourself.no-value
-              No assignee
-              - if can_edit_issuable
-                \-
-                %a.js-assign-yourself{ href: '#' }
-                  assign yourself
+        - if issuable.instance_of?(Issue)
+          #js-vue-sidebar-assignees{ data: { field: "#{issuable.to_ability_name}[assignee_ids]" } }
+        - else
+          .sidebar-collapsed-icon.sidebar-collapsed-user{ data: { toggle: "tooltip", placement: "left", container: "body" }, title: (issuable.assignee.name if issuable.assignee) }
+            - if issuable.assignee
+              = link_to_member(@project, issuable.assignee, size: 24)
+            - else
+              = icon('user', 'aria-hidden': 'true')
+          .title.hide-collapsed
+            Assignee
+            = icon('spinner spin', class: 'hidden block-loading', 'aria-hidden': 'true')
+            - if can_edit_issuable
+              = link_to 'Edit', '#', class: 'edit-link pull-right'
+          .value.hide-collapsed
+            - if issuable.assignee
+              = link_to_member(@project, issuable.assignee, size: 32, extra_class: 'bold') do
+                - if issuable.instance_of?(MergeRequest) && !issuable.can_be_merged_by?(issuable.assignee)
+                  %span.pull-right.cannot-be-merged{ data: { toggle: 'tooltip', placement: 'left' }, title: 'Not allowed to merge' }
+                    = icon('exclamation-triangle', 'aria-hidden': 'true')
+                %span.username
+                  = issuable.assignee.to_reference
+            - else
+              %span.assign-yourself.no-value
+                No assignee
+                - if can_edit_issuable
+                  \-
+                  %a.js-assign-yourself{ href: '#' }
+                    assign yourself
 
         .selectbox.hide-collapsed
-          = f.hidden_field 'assignee_id', value: issuable.assignee_id, id: 'issue_assignee_id'
-          = dropdown_tag('Select assignee', options: { toggle_class: 'js-user-search js-author-search', title: 'Assign to', filter: true, dropdown_class: 'dropdown-menu-user dropdown-menu-selectable dropdown-menu-author', placeholder: 'Search users', data: { first_user: (current_user.username if current_user), current_user: true, project_id: (@project.id if @project), author_id: issuable.author_id, field_name: "#{issuable.to_ability_name}[assignee_id]", issue_update: issuable_json_path(issuable), ability_name: issuable.to_ability_name, null_user: true, null_user_default: true, selected: issuable.assignee_id } })
+          - issuable.assignees.each do |assignee|
+            = hidden_field_tag "#{issuable.to_ability_name}[assignee_ids][]", assignee.id, id: nil
 
+          - options = { toggle_class: 'js-user-search js-author-search', title: 'Assign to', filter: true, dropdown_class: 'dropdown-menu-user dropdown-menu-selectable dropdown-menu-author', placeholder: 'Search users', data: { first_user: (current_user.username if current_user), current_user: true, project_id: (@project.id if @project), author_id: issuable.author_id, field_name: "#{issuable.to_ability_name}[assignee_ids][]", issue_update: issuable_json_path(issuable), ability_name: issuable.to_ability_name, null_user: true } }
+
+          - if issuable.instance_of?(Issue)
+            - if issuable.assignees.length == 0
+              = hidden_field_tag "#{issuable.to_ability_name}[assignee_ids][]", 0, id: nil
+            - title = 'Select assignee'
+            - options[:toggle_class] += ' js-multiselect js-save-user-data'
+            - options[:data][:field_name] = "#{issuable.to_ability_name}[assignee_ids][]"
+            - options[:data][:multi_select] = true
+            - options[:data]['dropdown-title'] = title
+            - options[:data]['dropdown-header'] = 'Assignee'
+            - options[:data]['max-select'] = 1
+          - else
+            - title = 'Select assignee'
+
+          = dropdown_tag(title, options: options)
       .block.milestone
         .sidebar-collapsed-icon
           = icon('clock-o', 'aria-hidden': 'true')
@@ -75,11 +94,10 @@
           = dropdown_tag('Milestone', options: { title: 'Assign milestone', toggle_class: 'js-milestone-select js-extra-options', filter: true, dropdown_class: 'dropdown-menu-selectable', placeholder: 'Search milestones', data: { show_no: true, field_name: "#{issuable.to_ability_name}[milestone_id]", project_id: @project.id, issuable_id: issuable.id, milestones: namespace_project_milestones_path(@project.namespace, @project, :json), ability_name: issuable.to_ability_name, issue_update: issuable_json_path(issuable), use_id: true }})
       - if issuable.has_attribute?(:time_estimate)
         #issuable-time-tracker.block
-          %issuable-time-tracker{ ':time_estimate' => 'issuable.time_estimate', ':time_spent' => 'issuable.total_time_spent', ':human_time_estimate' => 'issuable.human_time_estimate', ':human_time_spent' => 'issuable.human_total_time_spent', 'docs-url' => help_page_path('workflow/time_tracking.md') }
-            // Fallback while content is loading
-            .title.hide-collapsed
-              Time tracking
-              = icon('spinner spin', 'aria-hidden': 'true')
+          // Fallback while content is loading
+          .title.hide-collapsed
+            Time tracking
+            = icon('spinner spin', 'aria-hidden': 'true')
       - if issuable.has_attribute?(:due_date)
         .block.due_date
           .sidebar-collapsed-icon
@@ -169,8 +187,13 @@
           = clipboard_button(text: project_ref, title: "Copy reference to clipboard", placement: "left")
 
     :javascript
-      gl.IssuableResource = new gl.SubbableResource('#{issuable_json_path(issuable)}');
-      new gl.IssuableTimeTracking("#{escape_javascript(serialize_issuable(issuable))}");
+      gl.sidebarOptions = {
+        endpoint: "#{issuable_json_path(issuable)}",
+        editable: #{can_edit_issuable ? true : false},
+        currentUser: #{current_user.to_json(only: [:username, :id, :name], methods: :avatar_url)},
+        rootPath: "#{root_path}"
+      };
+
       new MilestoneSelect('{"full_path":"#{@project.full_path}"}');
       new LabelsSelect();
       new IssuableContext('#{escape_javascript(current_user.to_json(only: [:username, :id, :name]))}');
diff --git a/app/views/shared/issuable/form/_description.html.haml b/app/views/shared/issuable/form/_description.html.haml
index cbc7125c0d5..7ef0ae96be2 100644
--- a/app/views/shared/issuable/form/_description.html.haml
+++ b/app/views/shared/issuable/form/_description.html.haml
@@ -17,6 +17,6 @@
                                classes: 'note-textarea',
                                placeholder: "Write a comment or drag your files here...",
                                supports_slash_commands: supports_slash_commands
-      = render 'projects/notes/hints', supports_slash_commands: supports_slash_commands
+      = render 'shared/notes/hints', supports_slash_commands: supports_slash_commands
       .clearfix
       .error-alert
diff --git a/app/views/shared/issuable/form/_issue_assignee.html.haml b/app/views/shared/issuable/form/_issue_assignee.html.haml
new file mode 100644
index 00000000000..c33474ac3b4
--- /dev/null
+++ b/app/views/shared/issuable/form/_issue_assignee.html.haml
@@ -0,0 +1,30 @@
+- issue = issuable
+.block.assignee
+  .sidebar-collapsed-icon.sidebar-collapsed-user{ data: { toggle: "tooltip", placement: "left", container: "body" }, title: (issuable.assignee_list) }
+    - if issue.assignees.any?
+      - issue.assignees.each do |assignee|
+        = link_to_member(@project, assignee, size: 24)
+    - else
+      = icon('user', 'aria-hidden': 'true')
+  .title.hide-collapsed
+    Assignee
+    = icon('spinner spin', class: 'hidden block-loading', 'aria-hidden': 'true')
+    - if can_edit_issuable
+      = link_to 'Edit', '#', class: 'edit-link pull-right'
+  .value.hide-collapsed
+    - if issue.assignees.any?
+      - issue.assignees.each do |assignee|
+        = link_to_member(@project, assignee, size: 32, extra_class: 'bold') do
+          %span.username
+            = assignee.to_reference
+    - else
+      %span.assign-yourself.no-value
+        No assignee
+        - if can_edit_issuable
+          \-
+          %a.js-assign-yourself{ href: '#' }
+            assign yourself
+
+  .selectbox.hide-collapsed
+    = f.hidden_field 'assignee_ids', value: issuable.assignee_ids, id: 'issue_assignee_ids'
+    = dropdown_tag('Select assignee', options: { toggle_class: 'js-user-search js-author-search', title: 'Assign to', filter: true, dropdown_class: 'dropdown-menu-user dropdown-menu-selectable dropdown-menu-author', placeholder: 'Search users', data: { first_user: (current_user.username if current_user), current_user: true, project_id: (@project.id if @project), author_id: issuable.author_id, field_name: "#{issuable.to_ability_name}[assignee_id]", issue_update: issuable_json_path(issuable), ability_name: issuable.to_ability_name, null_user: true } })
diff --git a/app/views/shared/issuable/form/_merge_request_assignee.html.haml b/app/views/shared/issuable/form/_merge_request_assignee.html.haml
new file mode 100644
index 00000000000..18011d528a0
--- /dev/null
+++ b/app/views/shared/issuable/form/_merge_request_assignee.html.haml
@@ -0,0 +1,31 @@
+- merge_request = issuable
+.block.assignee
+  .sidebar-collapsed-icon.sidebar-collapsed-user{ data: { toggle: "tooltip", placement: "left", container: "body" }, title: (merge_request.assignee.name if merge_request.assignee) }
+    - if merge_request.assignee
+      = link_to_member(@project, merge_request.assignee, size: 24)
+    - else
+      = icon('user', 'aria-hidden': 'true')
+  .title.hide-collapsed
+    Assignee
+    = icon('spinner spin', class: 'hidden block-loading', 'aria-hidden': 'true')
+    - if can_edit_issuable
+      = link_to 'Edit', '#', class: 'edit-link pull-right'
+  .value.hide-collapsed
+    - if merge_request.assignee
+      = link_to_member(@project, merge_request.assignee, size: 32, extra_class: 'bold') do
+        - unless merge_request.can_be_merged_by?(merge_request.assignee)
+          %span.pull-right.cannot-be-merged{ data: { toggle: 'tooltip', placement: 'left' }, title: 'Not allowed to merge' }
+            = icon('exclamation-triangle', 'aria-hidden': 'true')
+        %span.username
+          = merge_request.assignee.to_reference
+    - else
+      %span.assign-yourself.no-value
+        No assignee
+        - if can_edit_issuable
+          \-
+          %a.js-assign-yourself{ href: '#' }
+            assign yourself
+
+  .selectbox.hide-collapsed
+    = f.hidden_field 'assignee_id', value: merge_request.assignee_id, id: 'issue_assignee_id'
+    = dropdown_tag('Select assignee', options: { toggle_class: 'js-user-search js-author-search', title: 'Assign to', filter: true, dropdown_class: 'dropdown-menu-user dropdown-menu-selectable dropdown-menu-author', placeholder: 'Search users', data: { first_user: (current_user.username if current_user), current_user: true, project_id: @project&.id, author_id: merge_request.author_id, field_name: 'merge_request[assignee_id]', issue_update: issuable_json_path(merge_request), ability_name: 'merge_request', null_user: true } })
diff --git a/app/views/shared/issuable/form/_metadata.html.haml b/app/views/shared/issuable/form/_metadata.html.haml
index 9dbfedb84f1..9281a515744 100644
--- a/app/views/shared/issuable/form/_metadata.html.haml
+++ b/app/views/shared/issuable/form/_metadata.html.haml
@@ -10,13 +10,27 @@
 .row
   %div{ class: (has_due_date ? "col-lg-6" : "col-sm-12") }
     .form-group.issue-assignee
-      = form.label :assignee_id, "Assignee", class: "control-label #{"col-lg-4" if has_due_date}"
-      .col-sm-10{ class: ("col-lg-8" if has_due_date) }
-        .issuable-form-select-holder
-          = form.hidden_field :assignee_id
-          = dropdown_tag(user_dropdown_label(issuable.assignee_id, "Assignee"), options: { toggle_class: "js-dropdown-keep-input js-user-search js-issuable-form-dropdown js-assignee-search", title: "Select assignee", filter: true, dropdown_class: "dropdown-menu-user dropdown-menu-selectable dropdown-menu-assignee js-filter-submit",
-            placeholder: "Search assignee", data: { first_user: current_user.try(:username), null_user: true, current_user: true, project_id: issuable.project.try(:id), selected: issuable.assignee_id, field_name: "#{issuable.class.model_name.param_key}[assignee_id]", default_label: "Assignee"} })
-        = link_to 'Assign to me', '#', class: "assign-to-me-link #{'hide' if issuable.assignee_id == current_user.id}"
+      - if issuable.is_a?(Issue)
+        = form.label :assignee_ids, "Assignee", class: "control-label #{"col-lg-4" if has_due_date}"
+        .col-sm-10{ class: ("col-lg-8" if has_due_date) }
+          .issuable-form-select-holder.selectbox
+            - issuable.assignees.each do |assignee|
+              = hidden_field_tag "#{issuable.to_ability_name}[assignee_ids][]", assignee.id, id: nil, data: { meta: assignee.name }
+
+            - if issuable.assignees.length === 0
+              = hidden_field_tag "#{issuable.to_ability_name}[assignee_ids][]", 0, id: nil, data: { meta: '' }
+
+            = dropdown_tag(users_dropdown_label(issuable.assignees), options: issue_dropdown_options(issuable,false))
+          = link_to 'Assign to me', '#', class: "assign-to-me-link #{'hide' if issuable.assignees.include?(current_user)}"
+      - else
+        = form.label :assignee_id, "Assignee", class: "control-label #{"col-lg-4" if has_due_date}"
+        .col-sm-10{ class: ("col-lg-8" if has_due_date) }
+          .issuable-form-select-holder
+            = form.hidden_field :assignee_id
+
+            = dropdown_tag(user_dropdown_label(issuable.assignee_id, "Assignee"), options: { toggle_class: "js-dropdown-keep-input js-user-search js-issuable-form-dropdown js-assignee-search", title: "Select assignee", filter: true, dropdown_class: "dropdown-menu-user dropdown-menu-selectable dropdown-menu-assignee js-filter-submit",
+              placeholder: "Search assignee", data: { first_user: current_user.try(:username), null_user: true, current_user: true, project_id: issuable.project.try(:id), selected: issuable.assignee_id, field_name: "#{issuable.class.model_name.param_key}[assignee_id]", default_label: "Assignee"} })
+          = link_to 'Assign to me', '#', class: "assign-to-me-link #{'hide' if issuable.assignee_id == current_user.id}"
     .form-group.issue-milestone
       = form.label :milestone_id, "Milestone", class: "control-label #{"col-lg-4" if has_due_date}"
       .col-sm-10{ class: ("col-lg-8" if has_due_date) }
diff --git a/app/views/shared/members/_requests.html.haml b/app/views/shared/members/_requests.html.haml
index 10050adfda5..92f6e7428ae 100644
--- a/app/views/shared/members/_requests.html.haml
+++ b/app/views/shared/members/_requests.html.haml
@@ -1,5 +1,5 @@
 - if requesters.any?
-  .panel.panel-default
+  .panel.panel-default.prepend-top-default
     .panel-heading
       Users requesting access to
       %strong= membership_source.name
diff --git a/app/views/shared/milestones/_issuable.html.haml b/app/views/shared/milestones/_issuable.html.haml
index 5247d6a51e6..22547a30cdf 100644
--- a/app/views/shared/milestones/_issuable.html.haml
+++ b/app/views/shared/milestones/_issuable.html.haml
@@ -1,7 +1,7 @@
 -# @project is present when viewing Project's milestone
 - project = @project || issuable.project
 - namespace = @project_namespace || project.namespace.becomes(Namespace)
-- assignee = issuable.assignee
+- assignees = issuable.assignees
 - issuable_type = issuable.class.table_name
 - base_url_args = [namespace, project]
 - issuable_type_args = base_url_args + [issuable_type]
@@ -26,7 +26,7 @@
         - render_colored_label(label)
 
     %span.assignee-icon
-      - if assignee
-        = link_to polymorphic_path(issuable_type_args, { milestone_title: @milestone.title, assignee_id: issuable.assignee_id, state: 'all' }),
+      - assignees.each do |assignee|
+        = link_to polymorphic_path(base_url_args, { milestone_title: @milestone.title, assignee_id: assignee.id, state: 'all' }),
                   class: 'has-tooltip', title: "Assigned to #{assignee.name}", data: { container: 'body' } do
-          - image_tag(avatar_icon(issuable.assignee, 16), class: "avatar s16", alt: '')
+          - image_tag(avatar_icon(assignee, 16), class: "avatar s16", alt: '')
diff --git a/app/views/shared/milestones/_labels_tab.html.haml b/app/views/shared/milestones/_labels_tab.html.haml
index 33f93dccd3c..a26b3b8009e 100644
--- a/app/views/shared/milestones/_labels_tab.html.haml
+++ b/app/views/shared/milestones/_labels_tab.html.haml
@@ -2,7 +2,7 @@
   - labels.each do |label|
     - options = { milestone_title: @milestone.title, label_name: label.title }
 
-    %li
+    %li.is-not-draggable
       %span.label-row
         %span.label-name
           = link_to milestones_label_path(options) do
@@ -10,10 +10,8 @@
         %span.prepend-description-left
           = markdown_field(label, :description)
 
-      .pull-info-right
-        %span.append-right-20
-          = link_to milestones_label_path(options.merge(state: 'opened')) do
-            - pluralize milestone_issues_by_label_count(@milestone, label, state: :opened), 'open issue'
-        %span.append-right-20
-          = link_to milestones_label_path(options.merge(state: 'closed')) do
-            - pluralize milestone_issues_by_label_count(@milestone, label, state: :closed), 'closed issue'
+      .pull-right.hidden-xs.hidden-sm.hidden-md
+        = link_to milestones_label_path(options.merge(state: 'opened')), class: 'btn btn-transparent btn-action' do
+          - pluralize milestone_issues_by_label_count(@milestone, label, state: :opened), 'open issue'
+        = link_to milestones_label_path(options.merge(state: 'closed')), class: 'btn btn-transparent btn-action' do
+          - pluralize milestone_issues_by_label_count(@milestone, label, state: :closed), 'closed issue'
diff --git a/app/views/projects/notes/_comment_button.html.haml b/app/views/shared/notes/_comment_button.html.haml
index 29cf5825292..29cf5825292 100644
--- a/app/views/projects/notes/_comment_button.html.haml
+++ b/app/views/shared/notes/_comment_button.html.haml
diff --git a/app/views/shared/notes/_edit.html.haml b/app/views/shared/notes/_edit.html.haml
new file mode 100644
index 00000000000..4a020865828
--- /dev/null
+++ b/app/views/shared/notes/_edit.html.haml
@@ -0,0 +1,3 @@
+.original-note-content.hidden{ data: { post_url: note_url(note), target_id: note.noteable.id, target_type: note.noteable.class.name.underscore } }
+  #{note.note}
+%textarea.hidden.js-task-list-field.original-task-list{ data: {update_url: note_url(note) } }= note.note
diff --git a/app/views/projects/notes/_edit_form.html.haml b/app/views/shared/notes/_edit_form.html.haml
index 3867072225f..8923e5602a4 100644
--- a/app/views/projects/notes/_edit_form.html.haml
+++ b/app/views/shared/notes/_edit_form.html.haml
@@ -4,7 +4,7 @@
     = hidden_field_tag :target_type, '', class: 'js-form-target-type'
     = render layout: 'projects/md_preview', locals: { url: preview_markdown_path(project), referenced_users: true } do
       = render 'projects/zen', attr: 'note[note]', classes: 'note-textarea js-note-text js-task-list-field', placeholder: "Write a comment or drag your files here..."
-      = render 'projects/notes/hints'
+      = render 'shared/notes/hints'
 
     .note-form-actions.clearfix
       .settings-message.note-edit-warning.js-finish-edit-warning
diff --git a/app/views/projects/notes/_form.html.haml b/app/views/shared/notes/_form.html.haml
index 46f785fefca..eaf50bc2115 100644
--- a/app/views/projects/notes/_form.html.haml
+++ b/app/views/shared/notes/_form.html.haml
@@ -4,7 +4,7 @@
 - else
   - preview_url = preview_markdown_path(@project)
 
-= form_for [@project.namespace.becomes(Namespace), @project, @note], remote: true, html: { :'data-type' => 'json', multipart: true, id: nil, class: "new-note js-new-note-form js-quick-submit common-note-form", "data-noteable-iid" => @note.noteable.try(:iid), }, authenticity_token: true do |f|
+= form_for form_resources, url: new_form_url, remote: true, html: { :'data-type' => 'json', multipart: true, id: nil, class: "new-note js-new-note-form js-quick-submit common-note-form", "data-noteable-iid" => @note.noteable.try(:iid), }, authenticity_token: true do |f|
   = hidden_field_tag :view, diff_view
   = hidden_field_tag :line_type
   = hidden_field_tag :merge_request_diff_head_sha, @note.noteable.try(:diff_head_sha)
@@ -28,11 +28,11 @@
       classes: 'note-textarea js-note-text',
       placeholder: "Write a comment or drag your files here...",
       supports_slash_commands: supports_slash_commands
-    = render 'projects/notes/hints', supports_slash_commands: supports_slash_commands
+    = render 'shared/notes/hints', supports_slash_commands: supports_slash_commands
     .error-alert
 
   .note-form-actions.clearfix
-    = render partial: 'projects/notes/comment_button'
+    = render partial: 'shared/notes/comment_button'
 
     = yield(:note_actions)
 
diff --git a/app/views/projects/notes/_hints.html.haml b/app/views/shared/notes/_hints.html.haml
index 81d97eabe65..81d97eabe65 100644
--- a/app/views/projects/notes/_hints.html.haml
+++ b/app/views/shared/notes/_hints.html.haml
diff --git a/app/views/shared/notes/_note.html.haml b/app/views/shared/notes/_note.html.haml
index 9657b4eea82..5c1156b06fb 100644
--- a/app/views/shared/notes/_note.html.haml
+++ b/app/views/shared/notes/_note.html.haml
@@ -40,12 +40,9 @@
       .note-body{ class: note_editable ? 'js-task-list-container' : '' }
         .note-text.md
           = note.redacted_note_html
-        = edited_time_ago_with_tooltip(note, placement: 'bottom', html_class: 'note_edited_ago', include_author: true)
+        = edited_time_ago_with_tooltip(note, placement: 'bottom', html_class: 'note_edited_ago')
         - if note_editable
-          - if note.for_personal_snippet?
-            = render 'snippets/notes/edit', note: note
-          - else
-            = render 'projects/notes/edit', note: note
+          = render 'shared/notes/edit', note: note
         .note-awards
           = render 'award_emoji/awards_block', awardable: note, inline: false
         - if note.system
diff --git a/app/views/projects/notes/_notes_with_form.html.haml b/app/views/shared/notes/_notes_with_form.html.haml
index 2a66addb08a..9930cbd96d7 100644
--- a/app/views/projects/notes/_notes_with_form.html.haml
+++ b/app/views/shared/notes/_notes_with_form.html.haml
@@ -1,18 +1,18 @@
 %ul#notes-list.notes.main-notes-list.timeline
   = render "shared/notes/notes"
 
-= render 'projects/notes/edit_form', project: @project
+= render 'shared/notes/edit_form', project: @project
 
 %ul.notes.notes-form.timeline
   %li.timeline-entry
     .flash-container.timeline-content
 
-    - if can? current_user, :create_note, @project
+    - if  can_create_note?
       .timeline-icon.hidden-xs.hidden-sm
         %a.author_link{ href: user_path(current_user) }
           = image_tag avatar_icon(current_user), alt: current_user.to_reference, class: 'avatar s40'
       .timeline-content.timeline-content-form
-        = render "projects/notes/form", view: diff_view
+        = render "shared/notes/form", view: diff_view
     - elsif !current_user
       .disabled-comment.text-center
         .disabled-comment-text.inline
@@ -23,4 +23,4 @@
           to post a comment
 
 :javascript
-  var notes = new Notes("#{namespace_project_noteable_notes_path(namespace_id: @project.namespace, project_id: @project, target_id: @noteable.id, target_type: @noteable.class.name.underscore)}", #{@notes.map(&:id).to_json}, #{Time.now.to_i}, "#{diff_view}")
+  var notes = new Notes("#{notes_url}", #{@notes.map(&:id).to_json}, #{Time.now.to_i}, "#{diff_view}")
diff --git a/app/views/shared/snippets/_header.html.haml b/app/views/shared/snippets/_header.html.haml
index d084f5e9684..501c09d71d5 100644
--- a/app/views/shared/snippets/_header.html.haml
+++ b/app/views/shared/snippets/_header.html.haml
@@ -21,4 +21,4 @@
     = markdown_field(@snippet, :title)
 
   - if @snippet.updated_at != @snippet.created_at
-    = edited_time_ago_with_tooltip(@snippet, placement: 'bottom', html_class: 'snippet-edited-ago')
+    = edited_time_ago_with_tooltip(@snippet, placement: 'bottom', html_class: 'snippet-edited-ago', exclude_author: true)
diff --git a/app/views/snippets/notes/_edit.html.haml b/app/views/snippets/notes/_edit.html.haml
deleted file mode 100644
index e69de29bb2d..00000000000
--- a/app/views/snippets/notes/_edit.html.haml
+++ /dev/null
diff --git a/app/views/snippets/notes/_notes.html.haml b/app/views/snippets/notes/_notes.html.haml
deleted file mode 100644
index f07d6b8c126..00000000000
--- a/app/views/snippets/notes/_notes.html.haml
+++ /dev/null
@@ -1,2 +0,0 @@
-%ul#notes-list.notes.main-notes-list.timeline
-  = render "projects/notes/notes"
diff --git a/app/views/snippets/show.html.haml b/app/views/snippets/show.html.haml
index 98287cba5b4..51dbbc32cc9 100644
--- a/app/views/snippets/show.html.haml
+++ b/app/views/snippets/show.html.haml
@@ -2,11 +2,11 @@
 
 = render 'shared/snippets/header'
 
-%article.file-holder.snippet-file-content
-  = render 'shared/snippets/blob'
+.personal-snippets
+  %article.file-holder.snippet-file-content
+    = render 'shared/snippets/blob'
 
-.row-content-block.top-block.content-component-block
-  = render 'award_emoji/awards_block', awardable: @snippet, inline: true
+  .row-content-block.top-block.content-component-block
+    = render 'award_emoji/awards_block', awardable: @snippet, inline: true
 
-%ul#notes-list.notes.main-notes-list.timeline
-  #notes= render 'shared/notes/notes'
+  #notes= render "shared/notes/notes_with_form"
diff --git a/app/workers/post_receive.rb b/app/workers/post_receive.rb
index 015a41b6e82..127d8dfbb61 100644
--- a/app/workers/post_receive.rb
+++ b/app/workers/post_receive.rb
@@ -2,27 +2,24 @@ class PostReceive
   include Sidekiq::Worker
   include DedicatedSidekiqQueue
 
-  def perform(repo_path, identifier, changes)
-    repo_relative_path = Gitlab::RepoPath.strip_storage_path(repo_path)
+  def perform(project_identifier, identifier, changes)
+    project, is_wiki = parse_project_identifier(project_identifier)
+
+    if project.nil?
+      log("Triggered hook for non-existing project with identifier \"#{project_identifier}\"")
+      return false
+    end
 
     changes = Base64.decode64(changes) unless changes.include?(' ')
     # Use Sidekiq.logger so arguments can be correlated with execution
     # time and thread ID's.
     Sidekiq.logger.info "changes: #{changes.inspect}" if ENV['SIDEKIQ_LOG_ARGUMENTS']
-    post_received = Gitlab::GitPostReceive.new(repo_relative_path, identifier, changes)
-
-    if post_received.project.nil?
-      log("Triggered hook for non-existing project with full path \"#{repo_relative_path}\"")
-      return false
-    end
+    post_received = Gitlab::GitPostReceive.new(project, identifier, changes)
 
-    if post_received.wiki?
+    if is_wiki
       # Nothing defined here yet.
-    elsif post_received.regular_project?
-      process_project_changes(post_received)
     else
-      log("Triggered hook for unidentifiable repository type with full path \"#{repo_relative_path}\"")
-      false
+      process_project_changes(post_received)
     end
   end
 
@@ -47,6 +44,21 @@ class PostReceive
 
   private
 
+  # To maintain backwards compatibility, we accept both gl_repository or
+  # repository paths as project identifiers. Our plan is to migrate to
+  # gl_repository only with the following plan:
+  # 9.2: Handle both possible values. Keep Gitlab-Shell sending only repo paths
+  # 9.3 (or patch release): Make GitLab Shell pass gl_repository if present
+  # 9.4 (or patch release): Make GitLab Shell always pass gl_repository
+  # 9.5 (or patch release): Handle only gl_repository as project identifier on this method
+  def parse_project_identifier(project_identifier)
+    if project_identifier.start_with?('/')
+      Gitlab::RepoPath.parse(project_identifier)
+    else
+      Gitlab::GlRepository.parse(project_identifier)
+    end
+  end
+
   def log(message)
     Gitlab::GitLogger.error("POST-RECEIVE: #{message}")
   end
diff --git a/app/workers/propagate_service_template_worker.rb b/app/workers/propagate_service_template_worker.rb
new file mode 100644
index 00000000000..5ce0e0405d0
--- /dev/null
+++ b/app/workers/propagate_service_template_worker.rb
@@ -0,0 +1,21 @@
+# Worker for updating any project specific caches.
+class PropagateServiceTemplateWorker
+  include Sidekiq::Worker
+  include DedicatedSidekiqQueue
+
+  LEASE_TIMEOUT = 4.hours.to_i
+
+  def perform(template_id)
+    return unless try_obtain_lease_for(template_id)
+
+    Projects::PropagateServiceTemplate.propagate(Service.find_by(id: template_id))
+  end
+
+  private
+
+  def try_obtain_lease_for(template_id)
+    Gitlab::ExclusiveLease.
+      new("propagate_service_template_worker:#{template_id}", timeout: LEASE_TIMEOUT).
+      try_obtain
+  end
+end
diff --git a/changelogs/unreleased/12910-personal-snippets-notes.yml b/changelogs/unreleased/12910-personal-snippets-notes.yml
new file mode 100644
index 00000000000..7f1576c3513
--- /dev/null
+++ b/changelogs/unreleased/12910-personal-snippets-notes.yml
@@ -0,0 +1,4 @@
+---
+title: Support comments for personal snippets
+merge_request:
+author:
diff --git a/changelogs/unreleased/17361-redirect-renamed-paths.yml b/changelogs/unreleased/17361-redirect-renamed-paths.yml
new file mode 100644
index 00000000000..7a33c9fb3ec
--- /dev/null
+++ b/changelogs/unreleased/17361-redirect-renamed-paths.yml
@@ -0,0 +1,4 @@
+---
+title: Redirect old links after renaming a user/group/project.
+merge_request: 10370
+author:
diff --git a/changelogs/unreleased/23751-add-contribution-graph-key-tooltips.yml b/changelogs/unreleased/23751-add-contribution-graph-key-tooltips.yml
new file mode 100644
index 00000000000..7c4c6fb46a0
--- /dev/null
+++ b/changelogs/unreleased/23751-add-contribution-graph-key-tooltips.yml
@@ -0,0 +1,4 @@
+---
+title: Add tooltips to user contribution graph key
+merge_request: 11138
+author:
diff --git a/changelogs/unreleased/24883-build-failure-summary-page.yml b/changelogs/unreleased/24883-build-failure-summary-page.yml
new file mode 100644
index 00000000000..214cd3e2bc7
--- /dev/null
+++ b/changelogs/unreleased/24883-build-failure-summary-page.yml
@@ -0,0 +1,4 @@
+---
+title: Added build failures summary page for pipelines
+merge_request: 10719
+author:
diff --git a/changelogs/unreleased/29925-gitlab-shell-hooks-can-no-longer-send-absolute-paths-to-gitlab-ce.yml b/changelogs/unreleased/29925-gitlab-shell-hooks-can-no-longer-send-absolute-paths-to-gitlab-ce.yml
new file mode 100644
index 00000000000..1df8f695ef1
--- /dev/null
+++ b/changelogs/unreleased/29925-gitlab-shell-hooks-can-no-longer-send-absolute-paths-to-gitlab-ce.yml
@@ -0,0 +1,4 @@
+---
+title: Generate and handle a gl_repository param to pass around components
+merge_request: 10992
+author:
diff --git a/changelogs/unreleased/30007-done-todo-hover-state.yml b/changelogs/unreleased/30007-done-todo-hover-state.yml
new file mode 100644
index 00000000000..bfbde7a49c8
--- /dev/null
+++ b/changelogs/unreleased/30007-done-todo-hover-state.yml
@@ -0,0 +1,4 @@
+---
+title: Add transparent top-border to the hover state of done todos
+merge_request:
+author:
diff --git a/changelogs/unreleased/30903-vertically-align-mini-pipeline.yml b/changelogs/unreleased/30903-vertically-align-mini-pipeline.yml
new file mode 100644
index 00000000000..af87e5ce39f
--- /dev/null
+++ b/changelogs/unreleased/30903-vertically-align-mini-pipeline.yml
@@ -0,0 +1,4 @@
+---
+title: Vertically align mini pipeline stage container
+merge_request:
+author:
diff --git a/changelogs/unreleased/31689-request-access-spacing.yml b/changelogs/unreleased/31689-request-access-spacing.yml
new file mode 100644
index 00000000000..66076b44f46
--- /dev/null
+++ b/changelogs/unreleased/31689-request-access-spacing.yml
@@ -0,0 +1,4 @@
+---
+title: Add default margin-top to user request table on project members page
+merge_request:
+author:
diff --git a/changelogs/unreleased/add_system_note_for_editing_issuable.yml b/changelogs/unreleased/add_system_note_for_editing_issuable.yml
new file mode 100644
index 00000000000..3cbc7f91bf0
--- /dev/null
+++ b/changelogs/unreleased/add_system_note_for_editing_issuable.yml
@@ -0,0 +1,4 @@
+---
+title: Add system note on description change of issue/merge request
+merge_request: 10392
+author: blackst0ne
diff --git a/changelogs/unreleased/balsalmiq-support.yml b/changelogs/unreleased/balsalmiq-support.yml
new file mode 100644
index 00000000000..56a0b4c83fa
--- /dev/null
+++ b/changelogs/unreleased/balsalmiq-support.yml
@@ -0,0 +1,4 @@
+---
+title: Added balsamiq file viewer
+merge_request: 10564
+author:
diff --git a/changelogs/unreleased/fix-admin-integrations.yml b/changelogs/unreleased/fix-admin-integrations.yml
new file mode 100644
index 00000000000..7689623501f
--- /dev/null
+++ b/changelogs/unreleased/fix-admin-integrations.yml
@@ -0,0 +1,4 @@
+---
+title: Fix new admin integrations not taking effect on existing projects
+merge_request:
+author:
diff --git a/changelogs/unreleased/fix-gb-hide-environment-external-url-btn-when-not-provided.yml b/changelogs/unreleased/fix-gb-hide-environment-external-url-btn-when-not-provided.yml
new file mode 100644
index 00000000000..66158e337fd
--- /dev/null
+++ b/changelogs/unreleased/fix-gb-hide-environment-external-url-btn-when-not-provided.yml
@@ -0,0 +1,4 @@
+---
+title: Hide external environment URL button on terminal page if URL is not defined
+merge_request: 11029
+author:
diff --git a/changelogs/unreleased/issue-title-description-realtime.yml b/changelogs/unreleased/issue-title-description-realtime.yml
new file mode 100644
index 00000000000..003e1a4ab33
--- /dev/null
+++ b/changelogs/unreleased/issue-title-description-realtime.yml
@@ -0,0 +1,4 @@
+---
+title: Add realtime descriptions to issue show pages
+merge_request:
+author:
diff --git a/changelogs/unreleased/winh-visual-token-labels.yml b/changelogs/unreleased/winh-visual-token-labels.yml
new file mode 100644
index 00000000000..d4952e910b4
--- /dev/null
+++ b/changelogs/unreleased/winh-visual-token-labels.yml
@@ -0,0 +1,4 @@
+---
+title: Colorize labels in search field
+merge_request: 11047
+author:
diff --git a/changelogs/unreleased/zj-real-time-pipelines.yml b/changelogs/unreleased/zj-real-time-pipelines.yml
new file mode 100644
index 00000000000..eec22e67467
--- /dev/null
+++ b/changelogs/unreleased/zj-real-time-pipelines.yml
@@ -0,0 +1,4 @@
+---
+title: Pipeline view updates in near real time
+merge_request: 10777
+author:
diff --git a/config/initializers/fast_gettext.rb b/config/initializers/fast_gettext.rb
index bea85b43b95..a69fe0c902e 100644
--- a/config/initializers/fast_gettext.rb
+++ b/config/initializers/fast_gettext.rb
@@ -1,4 +1,4 @@
-FastGettext.add_text_domain 'gitlab', path: 'locale', type: :po
+FastGettext.add_text_domain 'gitlab', path: File.join(Rails.root, 'locale'), type: :po
 FastGettext.default_text_domain = 'gitlab'
 FastGettext.default_available_locales = Gitlab::I18n.available_locales
 
diff --git a/config/routes/project.rb b/config/routes/project.rb
index 085f5a24e2e..68474a44368 100644
--- a/config/routes/project.rb
+++ b/config/routes/project.rb
@@ -123,6 +123,7 @@ constraints(ProjectUrlConstrainer.new) do
           post :cancel
           post :retry
           get :builds
+          get :failures
           get :status
         end
       end
diff --git a/config/sidekiq_queues.yml b/config/sidekiq_queues.yml
index c3bd73533d0..433381e79d3 100644
--- a/config/sidekiq_queues.yml
+++ b/config/sidekiq_queues.yml
@@ -53,3 +53,4 @@
   - [pages, 1]
   - [system_hook_push, 1]
   - [update_user_activity, 1]
+  - [propagate_service_template, 1]
diff --git a/config/webpack.config.js b/config/webpack.config.js
index 3abdb6c2d76..119b1ea9d2e 100644
--- a/config/webpack.config.js
+++ b/config/webpack.config.js
@@ -17,6 +17,10 @@ var DEV_SERVER_LIVERELOAD = process.env.DEV_SERVER_LIVERELOAD !== 'false';
 var WEBPACK_REPORT = process.env.WEBPACK_REPORT;
 
 var config = {
+  // because sqljs requires fs.
+  node: {
+    fs: "empty"
+  },
   context: path.join(ROOT_PATH, 'app/assets/javascripts'),
   entry: {
     blob:                 './blob_edit/blob_bundle.js',
@@ -34,8 +38,6 @@ var config = {
     graphs:               './graphs/graphs_bundle.js',
     group:                './group.js',
     groups_list:          './groups_list.js',
-    issuable:             './issuable/issuable_bundle.js',
-    locale:               './locale/index.js',
     issue_show:           './issue_show/index.js',
     locale:               './locale/index.js',
     main:                 './main.js',
@@ -46,15 +48,18 @@ var config = {
     notebook_viewer:      './blob/notebook_viewer.js',
     pdf_viewer:           './blob/pdf_viewer.js',
     pipelines:            './pipelines/index.js',
+    balsamiq_viewer:      './blob/balsamiq_viewer.js',
     profile:              './profile/profile_bundle.js',
     protected_branches:   './protected_branches/protected_branches_bundle.js',
     protected_tags:       './protected_tags',
+    sidebar:              './sidebar/sidebar_bundle.js',
     snippet:              './snippet/snippet_bundle.js',
     sketch_viewer:        './blob/sketch_viewer.js',
     stl_viewer:           './blob/stl_viewer.js',
     terminal:             './terminal/terminal_bundle.js',
     u2f:                  ['vendor/u2f'],
     users:                './users/users_bundle.js',
+    raven:                './raven/index.js',
   },
 
   output: {
@@ -133,12 +138,13 @@ var config = {
         'diff_notes',
         'environments',
         'environments_folder',
-        'issuable',
+        'sidebar',
         'issue_show',
         'merge_conflicts',
         'notebook_viewer',
         'pdf_viewer',
         'pipelines',
+        'balsamiq_viewer',
       ],
       minChunks: function(module, count) {
         return module.resource && (/vue_shared/).test(module.resource);
diff --git a/db/fixtures/development/09_issues.rb b/db/fixtures/development/09_issues.rb
index d93d133d157..0b32a461d56 100644
--- a/db/fixtures/development/09_issues.rb
+++ b/db/fixtures/development/09_issues.rb
@@ -8,7 +8,7 @@ Gitlab::Seeder.quiet do
         description: FFaker::Lorem.sentence,
         state: ['opened', 'closed'].sample,
         milestone: project.milestones.sample,
-        assignee: project.team.users.sample
+        assignees: [project.team.users.sample]
       }
 
       Issues::CreateService.new(project, project.team.users.sample, issue_params).execute
diff --git a/db/migrate/20170320171632_create_issue_assignees_table.rb b/db/migrate/20170320171632_create_issue_assignees_table.rb
new file mode 100644
index 00000000000..23b8da37b6d
--- /dev/null
+++ b/db/migrate/20170320171632_create_issue_assignees_table.rb
@@ -0,0 +1,40 @@
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class CreateIssueAssigneesTable < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  INDEX_NAME = 'index_issue_assignees_on_issue_id_and_user_id'
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  # When a migration requires downtime you **must** uncomment the following
+  # constant and define a short and easy to understand explanation as to why the
+  # migration requires downtime.
+  # DOWNTIME_REASON = ''
+
+  # When using the methods "add_concurrent_index" or "add_column_with_default"
+  # you must disable the use of transactions as these methods can not run in an
+  # existing transaction. When using "add_concurrent_index" make sure that this
+  # method is the _only_ method called in the migration, any other changes
+  # should go in a separate migration. This ensures that upon failure _only_ the
+  # index creation fails and can be retried or reverted easily.
+  #
+  # To disable transactions uncomment the following line and remove these
+  # comments:
+  # disable_ddl_transaction!
+
+  def up
+    create_table :issue_assignees do |t|
+      t.references :user, foreign_key: { on_delete: :cascade }, index: true, null: false
+      t.references :issue, foreign_key: { on_delete: :cascade }, null: false
+    end
+
+    add_index :issue_assignees, [:issue_id, :user_id], unique: true, name: INDEX_NAME
+  end
+
+  def down
+    drop_table :issue_assignees
+  end
+end
diff --git a/db/migrate/20170320173259_migrate_assignees.rb b/db/migrate/20170320173259_migrate_assignees.rb
new file mode 100644
index 00000000000..ba8edbd7d32
--- /dev/null
+++ b/db/migrate/20170320173259_migrate_assignees.rb
@@ -0,0 +1,52 @@
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class MigrateAssignees < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  # When a migration requires downtime you **must** uncomment the following
+  # constant and define a short and easy to understand explanation as to why the
+  # migration requires downtime.
+  # DOWNTIME_REASON = ''
+
+  # When using the methods "add_concurrent_index" or "add_column_with_default"
+  # you must disable the use of transactions as these methods can not run in an
+  # existing transaction. When using "add_concurrent_index" make sure that this
+  # method is the _only_ method called in the migration, any other changes
+  # should go in a separate migration. This ensures that upon failure _only_ the
+  # index creation fails and can be retried or reverted easily.
+  #
+  # To disable transactions uncomment the following line and remove these
+  # comments:
+  disable_ddl_transaction!
+
+  def up
+    # Optimisation: this accounts for most of the invalid assignee IDs on GitLab.com
+    update_column_in_batches(:issues, :assignee_id, nil) do |table, query|
+      query.where(table[:assignee_id].eq(0))
+    end
+
+    users = Arel::Table.new(:users)
+
+    update_column_in_batches(:issues, :assignee_id, nil) do |table, query|
+      query.where(table[:assignee_id].not_eq(nil)\
+        .and(
+          users.project("true").where(users[:id].eq(table[:assignee_id])).exists.not
+        ))
+    end
+
+    execute <<-EOF
+      INSERT INTO issue_assignees(issue_id, user_id)
+      SELECT id, assignee_id FROM issues WHERE assignee_id IS NOT NULL
+    EOF
+  end
+
+  def down
+    execute <<-EOF
+      DELETE FROM issue_assignees
+    EOF
+  end
+end
diff --git a/db/migrate/20170427215854_create_redirect_routes.rb b/db/migrate/20170427215854_create_redirect_routes.rb
new file mode 100644
index 00000000000..2bf086b3e30
--- /dev/null
+++ b/db/migrate/20170427215854_create_redirect_routes.rb
@@ -0,0 +1,14 @@
+class CreateRedirectRoutes < ActiveRecord::Migration
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  def change
+    create_table :redirect_routes do |t|
+      t.integer :source_id, null: false
+      t.string :source_type, null: false
+      t.string :path, null: false
+
+      t.timestamps null: false
+    end
+  end
+end
diff --git a/db/migrate/20170503021915_add_last_edited_at_and_last_edited_by_id_to_issues.rb b/db/migrate/20170503021915_add_last_edited_at_and_last_edited_by_id_to_issues.rb
new file mode 100644
index 00000000000..6ac10723c82
--- /dev/null
+++ b/db/migrate/20170503021915_add_last_edited_at_and_last_edited_by_id_to_issues.rb
@@ -0,0 +1,14 @@
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AddLastEditedAtAndLastEditedByIdToIssues < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  def change
+    add_column :issues, :last_edited_at, :timestamp
+    add_column :issues, :last_edited_by_id, :integer
+  end
+end
diff --git a/db/migrate/20170503022548_add_last_edited_at_and_last_edited_by_id_to_merge_requests.rb b/db/migrate/20170503022548_add_last_edited_at_and_last_edited_by_id_to_merge_requests.rb
new file mode 100644
index 00000000000..7a1acdcbf69
--- /dev/null
+++ b/db/migrate/20170503022548_add_last_edited_at_and_last_edited_by_id_to_merge_requests.rb
@@ -0,0 +1,14 @@
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AddLastEditedAtAndLastEditedByIdToMergeRequests < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  def change
+    add_column :merge_requests, :last_edited_at, :timestamp
+    add_column :merge_requests, :last_edited_by_id, :integer
+  end
+end
diff --git a/db/migrate/20170503184421_add_index_to_redirect_routes.rb b/db/migrate/20170503184421_add_index_to_redirect_routes.rb
new file mode 100644
index 00000000000..9062cf19a73
--- /dev/null
+++ b/db/migrate/20170503184421_add_index_to_redirect_routes.rb
@@ -0,0 +1,21 @@
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AddIndexToRedirectRoutes < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index(:redirect_routes, :path, unique: true)
+    add_concurrent_index(:redirect_routes, [:source_type, :source_id])
+  end
+
+  def down
+    remove_concurrent_index(:redirect_routes, :path) if index_exists?(:redirect_routes, :path)
+    remove_concurrent_index(:redirect_routes, [:source_type, :source_id]) if index_exists?(:redirect_routes, [:source_type, :source_id])
+  end
+end
diff --git a/db/migrate/20170503185032_index_redirect_routes_path_for_like.rb b/db/migrate/20170503185032_index_redirect_routes_path_for_like.rb
new file mode 100644
index 00000000000..5b8b6c828be
--- /dev/null
+++ b/db/migrate/20170503185032_index_redirect_routes_path_for_like.rb
@@ -0,0 +1,29 @@
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class IndexRedirectRoutesPathForLike < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  INDEX_NAME = 'index_redirect_routes_on_path_text_pattern_ops'
+
+  disable_ddl_transaction!
+
+  def up
+    return unless Gitlab::Database.postgresql?
+
+    unless index_exists?(:redirect_routes, :path, name: INDEX_NAME)
+      execute("CREATE INDEX CONCURRENTLY #{INDEX_NAME} ON redirect_routes (path varchar_pattern_ops);")
+    end
+  end
+
+  def down
+    return unless Gitlab::Database.postgresql?
+
+    if index_exists?(:redirect_routes, :path, name: INDEX_NAME)
+      execute("DROP INDEX CONCURRENTLY #{INDEX_NAME};")
+    end
+  end
+end
diff --git a/db/migrate/20170504102911_add_clientside_sentry_to_application_settings.rb b/db/migrate/20170504102911_add_clientside_sentry_to_application_settings.rb
new file mode 100644
index 00000000000..141112f8b50
--- /dev/null
+++ b/db/migrate/20170504102911_add_clientside_sentry_to_application_settings.rb
@@ -0,0 +1,33 @@
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AddClientsideSentryToApplicationSettings < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  # When a migration requires downtime you **must** uncomment the following
+  # constant and define a short and easy to understand explanation as to why the
+  # migration requires downtime.
+  # DOWNTIME_REASON = ''
+
+  # When using "add_concurrent_index" or "remove_concurrent_index" methods make sure
+  # that either of them is the _only_ method called in the migration,
+  # any other changes should go in a separate migration.
+  # This ensures that upon failure _only_ the index creation or removing fails
+  # and can be retried or reverted easily.
+  #
+  # To disable transactions uncomment the following line and remove these
+  # comments:
+  disable_ddl_transaction!
+
+  def up
+    add_column_with_default :application_settings, :clientside_sentry_enabled, :boolean, default: false
+    add_column :application_settings, :clientside_sentry_dsn, :string
+  end
+
+  def down
+    remove_columns :application_settings, :clientside_sentry_enabled, :clientside_sentry_dsn
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 992be55fe68..79cf95e2c1b 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20170503004425) do
+ActiveRecord::Schema.define(version: 20170504102911) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -121,6 +121,8 @@ ActiveRecord::Schema.define(version: 20170503004425) do
     t.integer "cached_markdown_version"
     t.boolean "usage_ping_enabled", default: true, null: false
     t.string "uuid"
+    t.boolean "clientside_sentry_enabled", default: false, null: false
+    t.string "clientside_sentry_dsn"
   end
 
   create_table "audit_events", force: :cascade do |t|
@@ -452,6 +454,14 @@ ActiveRecord::Schema.define(version: 20170503004425) do
 
   add_index "identities", ["user_id"], name: "index_identities_on_user_id", using: :btree
 
+  create_table "issue_assignees", force: :cascade do |t|
+    t.integer "user_id", null: false
+    t.integer "issue_id", null: false
+  end
+
+  add_index "issue_assignees", ["issue_id", "user_id"], name: "index_issue_assignees_on_issue_id_and_user_id", unique: true, using: :btree
+  add_index "issue_assignees", ["user_id"], name: "index_issue_assignees_on_user_id", using: :btree
+
   create_table "issue_metrics", force: :cascade do |t|
     t.integer "issue_id", null: false
     t.datetime "first_mentioned_in_commit_at"
@@ -488,6 +498,8 @@ ActiveRecord::Schema.define(version: 20170503004425) do
     t.integer "relative_position"
     t.datetime "closed_at"
     t.integer "cached_markdown_version"
+    t.datetime "last_edited_at"
+    t.integer "last_edited_by_id"
   end
 
   add_index "issues", ["assignee_id"], name: "index_issues_on_assignee_id", using: :btree
@@ -674,6 +686,8 @@ ActiveRecord::Schema.define(version: 20170503004425) do
     t.text "description_html"
     t.integer "time_estimate"
     t.integer "cached_markdown_version"
+    t.datetime "last_edited_at"
+    t.integer "last_edited_by_id"
   end
 
   add_index "merge_requests", ["assignee_id"], name: "index_merge_requests_on_assignee_id", using: :btree
@@ -1038,6 +1052,18 @@ ActiveRecord::Schema.define(version: 20170503004425) do
 
   add_index "protected_tags", ["project_id"], name: "index_protected_tags_on_project_id", using: :btree
 
+  create_table "redirect_routes", force: :cascade do |t|
+    t.integer "source_id", null: false
+    t.string "source_type", null: false
+    t.string "path", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
+  add_index "redirect_routes", ["path"], name: "index_redirect_routes_on_path", unique: true, using: :btree
+  add_index "redirect_routes", ["path"], name: "index_redirect_routes_on_path_text_pattern_ops", using: :btree, opclasses: {"path"=>"varchar_pattern_ops"}
+  add_index "redirect_routes", ["source_type", "source_id"], name: "index_redirect_routes_on_source_type_and_source_id", using: :btree
+
   create_table "releases", force: :cascade do |t|
     t.string "tag"
     t.text "description"
@@ -1386,6 +1412,8 @@ ActiveRecord::Schema.define(version: 20170503004425) do
   add_foreign_key "ci_trigger_requests", "ci_triggers", column: "trigger_id", name: "fk_b8ec8b7245", on_delete: :cascade
   add_foreign_key "ci_trigger_schedules", "ci_triggers", column: "trigger_id", name: "fk_90a406cc94", on_delete: :cascade
   add_foreign_key "ci_triggers", "users", column: "owner_id", name: "fk_e8e10d1964", on_delete: :cascade
+  add_foreign_key "issue_assignees", "issues", on_delete: :cascade
+  add_foreign_key "issue_assignees", "users", on_delete: :cascade
   add_foreign_key "container_repositories", "projects"
   add_foreign_key "issue_metrics", "issues", on_delete: :cascade
   add_foreign_key "label_priorities", "labels", on_delete: :cascade
diff --git a/doc/api/issues.md b/doc/api/issues.md
index 6c10b5ab0e7..1d43b1298b9 100644
--- a/doc/api/issues.md
+++ b/doc/api/issues.md
@@ -70,6 +70,14 @@ Example response:
          "updated_at" : "2016-01-04T15:31:39.996Z"
       },
       "project_id" : 1,
+      "assignees" : [{
+         "state" : "active",
+         "id" : 1,
+         "name" : "Administrator",
+         "web_url" : "https://gitlab.example.com/root",
+         "avatar_url" : null,
+         "username" : "root"
+      }],
       "assignee" : {
          "state" : "active",
          "id" : 1,
@@ -92,6 +100,8 @@ Example response:
 ]
 ```
 
+**Note**: `assignee` column is deprecated, it shows the first assignee only.
+
 ## List group issues
 
 Get a list of a group's issues.
@@ -153,6 +163,14 @@ Example response:
       "description" : "Omnis vero earum sunt corporis dolor et placeat.",
       "state" : "closed",
       "iid" : 1,
+      "assignees" : [{
+         "avatar_url" : null,
+         "web_url" : "https://gitlab.example.com/lennie",
+         "state" : "active",
+         "username" : "lennie",
+         "id" : 9,
+         "name" : "Dr. Luella Kovacek"
+      }],
       "assignee" : {
          "avatar_url" : null,
          "web_url" : "https://gitlab.example.com/lennie",
@@ -174,6 +192,8 @@ Example response:
 ]
 ```
 
+**Note**: `assignee` column is deprecated, it shows the first assignee only.
+
 ## List project issues
 
 Get a list of a project's issues.
@@ -235,6 +255,14 @@ Example response:
       "description" : "Omnis vero earum sunt corporis dolor et placeat.",
       "state" : "closed",
       "iid" : 1,
+      "assignees" : [{
+         "avatar_url" : null,
+         "web_url" : "https://gitlab.example.com/lennie",
+         "state" : "active",
+         "username" : "lennie",
+         "id" : 9,
+         "name" : "Dr. Luella Kovacek"
+      }],
       "assignee" : {
          "avatar_url" : null,
          "web_url" : "https://gitlab.example.com/lennie",
@@ -256,6 +284,8 @@ Example response:
 ]
 ```
 
+**Note**: `assignee` column is deprecated, it shows the first assignee only.
+
 ## Single issue
 
 Get a single project issue.
@@ -300,6 +330,14 @@ Example response:
    "description" : "Omnis vero earum sunt corporis dolor et placeat.",
    "state" : "closed",
    "iid" : 1,
+   "assignees" : [{
+      "avatar_url" : null,
+      "web_url" : "https://gitlab.example.com/lennie",
+      "state" : "active",
+      "username" : "lennie",
+      "id" : 9,
+      "name" : "Dr. Luella Kovacek"
+   }],
    "assignee" : {
       "avatar_url" : null,
       "web_url" : "https://gitlab.example.com/lennie",
@@ -321,6 +359,8 @@ Example response:
 }
 ```
 
+**Note**: `assignee` column is deprecated, it shows the first assignee only.
+
 ## New issue
 
 Creates a new project issue.
@@ -329,13 +369,13 @@ Creates a new project issue.
 POST /projects/:id/issues
 ```
 
-| Attribute                                 | Type    | Required | Description  |
-|-------------------------------------------|---------|----------|--------------|
+| Attribute                                 | Type           | Required | Description  |
+|-------------------------------------------|----------------|----------|--------------|
 | `id`                                      | integer/string | yes      | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) owned by the authenticated user |
 | `title`                                   | string  | yes      | The title of an issue |
 | `description`                             | string  | no       | The description of an issue  |
 | `confidential`                            | boolean | no       | Set an issue to be confidential. Default is `false`.  |
-| `assignee_id`                             | integer | no       | The ID of a user to assign issue |
+| `assignee_ids`                            | Array[integer] | no       | The ID of a user to assign issue |
 | `milestone_id`                            | integer | no       | The ID of a milestone to assign issue  |
 | `labels`                                  | string  | no       | Comma-separated label names for an issue  |
 | `created_at`                              | string  | no       | Date time string, ISO 8601 formatted, e.g. `2016-03-11T03:45:40Z` (requires admin or project owner rights) |
@@ -357,6 +397,7 @@ Example response:
    "iid" : 14,
    "title" : "Issues with auth",
    "state" : "opened",
+   "assignees" : [],
    "assignee" : null,
    "labels" : [
       "bug"
@@ -380,6 +421,8 @@ Example response:
 }
 ```
 
+**Note**: `assignee` column is deprecated, it shows the first assignee only.
+
 ## Edit issue
 
 Updates an existing project issue. This call is also used to mark an issue as
@@ -396,7 +439,7 @@ PUT /projects/:id/issues/:issue_iid
 | `title`        | string  | no       | The title of an issue                                                                                      |
 | `description`  | string  | no       | The description of an issue                                                                                |
 | `confidential` | boolean | no       | Updates an issue to be confidential                                                                        |
-| `assignee_id`  | integer | no       | The ID of a user to assign the issue to                                                                    |
+| `assignee_ids`  | Array[integer] | no       | The ID of a user to assign the issue to                                                                    |
 | `milestone_id` | integer | no       | The ID of a milestone to assign the issue to                                                               |
 | `labels`       | string  | no       | Comma-separated label names for an issue                                                                   |
 | `state_event`  | string  | no       | The state event of an issue. Set `close` to close the issue and `reopen` to reopen it                      |
@@ -430,6 +473,7 @@ Example response:
       "bug"
    ],
    "id" : 85,
+   "assignees" : [],
    "assignee" : null,
    "milestone" : null,
    "subscribed" : true,
@@ -440,6 +484,8 @@ Example response:
 }
 ```
 
+**Note**: `assignee` column is deprecated, it shows the first assignee only.
+
 ## Delete an issue
 
 Only for admins and project owners. Soft deletes the issue in question.
@@ -494,6 +540,14 @@ Example response:
   "updated_at": "2016-04-07T12:20:17.596Z",
   "labels": [],
   "milestone": null,
+  "assignees": [{
+    "name": "Miss Monserrate Beier",
+    "username": "axel.block",
+    "id": 12,
+    "state": "active",
+    "avatar_url": "http://www.gravatar.com/avatar/46f6f7dc858ada7be1853f7fb96e81da?s=80&d=identicon",
+    "web_url": "https://gitlab.example.com/axel.block"
+  }],
   "assignee": {
     "name": "Miss Monserrate Beier",
     "username": "axel.block",
@@ -516,6 +570,8 @@ Example response:
 }
 ```
 
+**Note**: `assignee` column is deprecated, it shows the first assignee only.
+
 ## Subscribe to an issue
 
 Subscribes the authenticated user to an issue to receive notifications.
@@ -549,6 +605,14 @@ Example response:
   "updated_at": "2016-04-07T12:20:17.596Z",
   "labels": [],
   "milestone": null,
+  "assignees": [{
+    "name": "Miss Monserrate Beier",
+    "username": "axel.block",
+    "id": 12,
+    "state": "active",
+    "avatar_url": "http://www.gravatar.com/avatar/46f6f7dc858ada7be1853f7fb96e81da?s=80&d=identicon",
+    "web_url": "https://gitlab.example.com/axel.block"
+  }],
   "assignee": {
     "name": "Miss Monserrate Beier",
     "username": "axel.block",
@@ -571,6 +635,8 @@ Example response:
 }
 ```
 
+**Note**: `assignee` column is deprecated, it shows the first assignee only.
+
 ## Unsubscribe from an issue
 
 Unsubscribes the authenticated user from the issue to not receive notifications
@@ -652,6 +718,14 @@ Example response:
       "updated_at": "2016-06-17T07:47:33.832Z",
       "due_date": null
     },
+    "assignees": [{
+      "name": "Jarret O'Keefe",
+      "username": "francisca",
+      "id": 14,
+      "state": "active",
+      "avatar_url": "http://www.gravatar.com/avatar/a7fa515d53450023c83d62986d0658a8?s=80&d=identicon",
+      "web_url": "https://gitlab.example.com/francisca"
+    }],
     "assignee": {
       "name": "Jarret O'Keefe",
       "username": "francisca",
@@ -683,6 +757,8 @@ Example response:
 }
 ```
 
+**Note**: `assignee` column is deprecated, it shows the first assignee only.
+
 ## Set a time estimate for an issue
 
 Sets an estimated time of work for this issue.
diff --git a/doc/development/fe_guide/droplab/droplab.md b/doc/development/fe_guide/droplab/droplab.md
index 8f0b6b21953..112ff3419d9 100644
--- a/doc/development/fe_guide/droplab/droplab.md
+++ b/doc/development/fe_guide/droplab/droplab.md
@@ -183,6 +183,8 @@ For example,
 either by a mouse click or by enter key selection.
 * The `droplab-item-active` css class is added to items that have been selected
 using arrow key navigation.
+* You can add the `droplab-item-ignore` css class to any item that you do not want to be selectable. For example,
+an `<li class="divider"></li>` list divider element that should not be interactive.
 
 ## Internal events
 
diff --git a/doc/user/project/integrations/webhooks.md b/doc/user/project/integrations/webhooks.md
index dbdc93a77a8..e15daa2feae 100644
--- a/doc/user/project/integrations/webhooks.md
+++ b/doc/user/project/integrations/webhooks.md
@@ -232,6 +232,7 @@ X-Gitlab-Event: Issue Hook
   "object_attributes": {
     "id": 301,
     "title": "New API: create/update/delete file",
+    "assignee_ids": [51],
     "assignee_id": 51,
     "author_id": 51,
     "project_id": 14,
@@ -246,6 +247,11 @@ X-Gitlab-Event: Issue Hook
     "url": "http://example.com/diaspora/issues/23",
     "action": "open"
   },
+  "assignees": [{
+    "name": "User1",
+    "username": "user1",
+    "avatar_url": "http://www.gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=40\u0026d=identicon"
+  }],
   "assignee": {
     "name": "User1",
     "username": "user1",
@@ -265,6 +271,9 @@ X-Gitlab-Event: Issue Hook
   }]
 }
 ```
+
+**Note**: `assignee` and `assignee_id` keys are deprecated and now show the first assignee only.
+
 ### Comment events
 
 Triggered when a new comment is made on commits, merge requests, issues, and code snippets.
@@ -544,6 +553,7 @@ X-Gitlab-Event: Note Hook
   "issue": {
     "id": 92,
     "title": "test",
+    "assignee_ids": [],
     "assignee_id": null,
     "author_id": 1,
     "project_id": 5,
@@ -559,6 +569,8 @@ X-Gitlab-Event: Note Hook
 }
 ```
 
+**Note**: `assignee_id` field is deprecated and now shows the first assignee only.
+
 #### Comment on code snippet
 
 **Request header**:
diff --git a/features/project/issues/issues.feature b/features/project/issues/issues.feature
index 4dee0cd23dc..1b00d8a32a0 100644
--- a/features/project/issues/issues.feature
+++ b/features/project/issues/issues.feature
@@ -82,6 +82,7 @@ Feature: Project Issues
 
   # Markdown
 
+  @javascript
   Scenario: Headers inside the description should have ids generated for them.
     Given I visit issue page "Release 0.4"
     Then Header "Description header" should have correct id and link
diff --git a/features/steps/dashboard/dashboard.rb b/features/steps/dashboard/dashboard.rb
index c715c85c43c..bf09d7b7114 100644
--- a/features/steps/dashboard/dashboard.rb
+++ b/features/steps/dashboard/dashboard.rb
@@ -77,7 +77,7 @@ class Spinach::Features::Dashboard < Spinach::FeatureSteps
 
   step 'project "Shop" has issue "Bugfix1" with label "feature"' do
     project = Project.find_by(name: "Shop")
-    issue = create(:issue, title: "Bugfix1", project: project, assignee: current_user)
+    issue = create(:issue, title: "Bugfix1", project: project, assignees: [current_user])
     issue.labels << project.labels.find_by(title: 'feature')
   end
 end
diff --git a/features/steps/dashboard/todos.rb b/features/steps/dashboard/todos.rb
index 3225e19995b..b56558ba0d2 100644
--- a/features/steps/dashboard/todos.rb
+++ b/features/steps/dashboard/todos.rb
@@ -182,7 +182,7 @@ class Spinach::Features::DashboardTodos < Spinach::FeatureSteps
   end
 
   def issue
-    @issue ||= create(:issue, assignee: current_user, project: project)
+    @issue ||= create(:issue, assignees: [current_user], project: project)
   end
 
   def merge_request
diff --git a/features/steps/group/milestones.rb b/features/steps/group/milestones.rb
index 49fcd6f1201..0b0983f0d06 100644
--- a/features/steps/group/milestones.rb
+++ b/features/steps/group/milestones.rb
@@ -113,7 +113,7 @@ class Spinach::Features::GroupMilestones < Spinach::FeatureSteps
 
       create :issue,
         project: project,
-        assignee: current_user,
+        assignees: [current_user],
         author: current_user,
         milestone: milestone
 
@@ -125,7 +125,7 @@ class Spinach::Features::GroupMilestones < Spinach::FeatureSteps
 
       issue = create :issue,
         project: project,
-        assignee: current_user,
+        assignees: [current_user],
         author: current_user,
         milestone: milestone
 
diff --git a/features/steps/groups.rb b/features/steps/groups.rb
index 4dc87dc4d9c..83d8abbab1f 100644
--- a/features/steps/groups.rb
+++ b/features/steps/groups.rb
@@ -61,7 +61,7 @@ class Spinach::Features::Groups < Spinach::FeatureSteps
   step 'project from group "Owned" has issues assigned to me' do
     create :issue,
       project: project,
-      assignee: current_user,
+      assignees: [current_user],
       author: current_user
   end
 
@@ -123,7 +123,7 @@ class Spinach::Features::Groups < Spinach::FeatureSteps
   step 'the archived project have some issues' do
     create :issue,
       project: @archived_project,
-      assignee: current_user,
+      assignees: [current_user],
       author: current_user
   end
 
diff --git a/lib/api/api.rb b/lib/api/api.rb
index 302ccd3e532..52cd7cbe3db 100644
--- a/lib/api/api.rb
+++ b/lib/api/api.rb
@@ -6,6 +6,7 @@ module API
 
     version 'v3', using: :path do
       helpers ::API::V3::Helpers
+      helpers ::API::Helpers::CommonHelpers
 
       mount ::API::V3::AwardEmoji
       mount ::API::V3::Boards
@@ -80,6 +81,7 @@ module API
     # Ensure the namespace is right, otherwise we might load Grape::API::Helpers
     helpers ::SentryHelper
     helpers ::API::Helpers
+    helpers ::API::Helpers::CommonHelpers
 
     # Keep in alphabetical order
     mount ::API::AccessRequests
diff --git a/lib/api/entities.rb b/lib/api/entities.rb
index 6d6ccefe877..f8f5548d23d 100644
--- a/lib/api/entities.rb
+++ b/lib/api/entities.rb
@@ -256,7 +256,11 @@ module API
     class IssueBasic < ProjectEntity
       expose :label_names, as: :labels
       expose :milestone, using: Entities::Milestone
-      expose :assignee, :author, using: Entities::UserBasic
+      expose :assignees, :author, using: Entities::UserBasic
+
+      expose :assignee, using: ::API::Entities::UserBasic do |issue, options|
+        issue.assignees.first
+      end
 
       expose :user_notes_count
       expose :upvotes, :downvotes
diff --git a/lib/api/helpers/common_helpers.rb b/lib/api/helpers/common_helpers.rb
new file mode 100644
index 00000000000..6236fdd43ca
--- /dev/null
+++ b/lib/api/helpers/common_helpers.rb
@@ -0,0 +1,13 @@
+module API
+  module Helpers
+    module CommonHelpers
+      def convert_parameters_from_legacy_format(params)
+        if params[:assignee_id].present?
+          params[:assignee_ids] = [params.delete(:assignee_id)]
+        end
+
+        params
+      end
+    end
+  end
+end
diff --git a/lib/api/helpers/internal_helpers.rb b/lib/api/helpers/internal_helpers.rb
index 718f936a1fc..264df7271a3 100644
--- a/lib/api/helpers/internal_helpers.rb
+++ b/lib/api/helpers/internal_helpers.rb
@@ -1,48 +1,14 @@
 module API
   module Helpers
     module InternalHelpers
-      # Project paths may be any of the following:
-      #   * /repository/storage/path/namespace/project
-      #   * /namespace/project
-      #   * namespace/project
-      #
-      # In addition, they may have a '.git' extension and multiple namespaces
-      #
-      # Transform all these cases to 'namespace/project'
-      def clean_project_path(project_path, storages = Gitlab.config.repositories.storages.values)
-        project_path = project_path.sub(/\.git\z/, '')
-
-        storages.each do |storage|
-          storage_path = File.expand_path(storage['path'])
-
-          if project_path.start_with?(storage_path)
-            project_path = project_path.sub(storage_path, '')
-            break
-          end
-        end
-
-        project_path.sub(/\A\//, '')
-      end
-
-      def project_path
-        @project_path ||= clean_project_path(params[:project])
-      end
-
       def wiki?
-        @wiki ||= project_path.end_with?('.wiki') &&
-          !Project.find_by_full_path(project_path)
+        set_project unless defined?(@wiki)
+        @wiki
       end
 
       def project
-        @project ||= begin
-          # Check for *.wiki repositories.
-          # Strip out the .wiki from the pathname before finding the
-          # project. This applies the correct project permissions to
-          # the wiki repository as well.
-          project_path.chomp!('.wiki') if wiki?
-
-          Project.find_by_full_path(project_path)
-        end
+        set_project unless defined?(@project)
+        @project
       end
 
       def ssh_authentication_abilities
@@ -66,6 +32,16 @@ module API
 
         ::Users::ActivityService.new(actor, 'Git SSH').execute if commands.include?(params[:action])
       end
+
+      private
+
+      def set_project
+        if params[:gl_repository]
+          @project, @wiki = Gitlab::GlRepository.parse(params[:gl_repository])
+        else
+          @project, @wiki = Gitlab::RepoPath.parse(params[:project])
+        end
+      end
     end
   end
 end
diff --git a/lib/api/internal.rb b/lib/api/internal.rb
index ebed26dd178..2a11790b215 100644
--- a/lib/api/internal.rb
+++ b/lib/api/internal.rb
@@ -42,6 +42,10 @@ module API
         if access_status.status
           log_user_activity(actor)
 
+          # Project id to pass between components that don't share/don't have
+          # access to the same filesystem mounts
+          response[:gl_repository] = Gitlab::GlRepository.gl_repository(project, wiki?)
+
           # Return the repository full path so that gitlab-shell has it when
           # handling ssh commands
           response[:repository_path] =
@@ -134,11 +138,9 @@ module API
 
         return unless Gitlab::GitalyClient.enabled?
 
-        relative_path = Gitlab::RepoPath.strip_storage_path(params[:repo_path])
-        project = Project.find_by_full_path(relative_path.sub(/\.(git|wiki)\z/, ''))
-
         begin
-          Gitlab::GitalyClient::Notifications.new(project.repository).post_receive
+          repository = wiki? ? project.wiki.repository : project.repository
+          Gitlab::GitalyClient::Notifications.new(repository.raw_repository).post_receive
         rescue GRPC::Unavailable => e
           render_api_error!(e, 500)
         end
diff --git a/lib/api/issues.rb b/lib/api/issues.rb
index 522f0f3be92..78db960ae28 100644
--- a/lib/api/issues.rb
+++ b/lib/api/issues.rb
@@ -32,7 +32,8 @@ module API
 
       params :issue_params_ce do
         optional :description, type: String, desc: 'The description of an issue'
-        optional :assignee_id, type: Integer, desc: 'The ID of a user to assign issue'
+        optional :assignee_ids, type: Array[Integer], desc: 'The array of user IDs to assign issue'
+        optional :assignee_id,  type: Integer, desc: '[Deprecated] The ID of a user to assign issue'
         optional :milestone_id, type: Integer, desc: 'The ID of a milestone to assign issue'
         optional :labels, type: String, desc: 'Comma-separated list of label names'
         optional :due_date, type: String, desc: 'Date string in the format YEAR-MONTH-DAY'
@@ -135,6 +136,8 @@ module API
 
         issue_params = declared_params(include_missing: false)
 
+        issue_params = convert_parameters_from_legacy_format(issue_params)
+
         issue = ::Issues::CreateService.new(user_project,
                                             current_user,
                                             issue_params.merge(request: request, api: true)).execute
@@ -159,7 +162,7 @@ module API
                               desc: 'Date time when the issue was updated. Available only for admins and project owners.'
         optional :state_event, type: String, values: %w[reopen close], desc: 'State of the issue'
         use :issue_params
-        at_least_one_of :title, :description, :assignee_id, :milestone_id,
+        at_least_one_of :title, :description, :assignee_ids, :assignee_id, :milestone_id,
                         :labels, :created_at, :due_date, :confidential, :state_event
       end
       put ':id/issues/:issue_iid' do
@@ -173,6 +176,8 @@ module API
 
         update_params = declared_params(include_missing: false).merge(request: request, api: true)
 
+        update_params = convert_parameters_from_legacy_format(update_params)
+
         issue = ::Issues::UpdateService.new(user_project,
                                             current_user,
                                             update_params).execute(issue)
diff --git a/lib/api/settings.rb b/lib/api/settings.rb
index d01c7f2703b..82f513c984e 100644
--- a/lib/api/settings.rb
+++ b/lib/api/settings.rb
@@ -58,6 +58,7 @@ module API
         :restricted_visibility_levels,
         :send_user_confirmation_email,
         :sentry_enabled,
+        :clientside_sentry_enabled,
         :session_expire_delay,
         :shared_runners_enabled,
         :sidekiq_throttling_enabled,
@@ -138,6 +139,10 @@ module API
       given sentry_enabled: ->(val) { val } do
         requires :sentry_dsn, type: String, desc: 'Sentry Data Source Name'
       end
+      optional :clientside_sentry_enabled, type: Boolean, desc: 'Sentry can also be used for reporting and logging clientside exceptions. https://sentry.io/for/javascript/'
+      given clientside_sentry_enabled: ->(val) { val } do
+        requires :clientside_sentry_dsn, type: String, desc: 'Clientside Sentry Data Source Name'
+      end
       optional :repository_storage, type: String, desc: 'Storage paths for new projects'
       optional :repository_checks_enabled, type: Boolean, desc: "GitLab will periodically run 'git fsck' in all project and wiki repositories to look for silent disk corruption issues."
       optional :koding_enabled, type: Boolean, desc: 'Enable Koding'
diff --git a/lib/api/v3/entities.rb b/lib/api/v3/entities.rb
index 832b4bdeb4f..7c8be7e51db 100644
--- a/lib/api/v3/entities.rb
+++ b/lib/api/v3/entities.rb
@@ -248,6 +248,13 @@ module API
         expose :project_id, :issues_events, :merge_requests_events
         expose :note_events, :build_events, :pipeline_events, :wiki_page_events
       end
+
+      class Issue < ::API::Entities::Issue
+        unexpose :assignees
+        expose :assignee do |issue, options|
+          ::API::Entities::UserBasic.represent(issue.assignees.first, options)
+        end
+      end
     end
   end
 end
diff --git a/lib/api/v3/issues.rb b/lib/api/v3/issues.rb
index 715083fc4f8..cb371fdbab8 100644
--- a/lib/api/v3/issues.rb
+++ b/lib/api/v3/issues.rb
@@ -8,6 +8,7 @@ module API
       helpers do
         def find_issues(args = {})
           args = params.merge(args)
+          args = convert_parameters_from_legacy_format(args)
 
           args.delete(:id)
           args[:milestone_title] = args.delete(:milestone)
@@ -51,7 +52,7 @@ module API
 
       resource :issues do
         desc "Get currently authenticated user's issues" do
-          success ::API::Entities::Issue
+          success ::API::V3::Entities::Issue
         end
         params do
           optional :state, type: String, values: %w[opened closed all], default: 'all',
@@ -61,7 +62,7 @@ module API
         get do
           issues = find_issues(scope: 'authored')
 
-          present paginate(issues), with: ::API::Entities::Issue, current_user: current_user
+          present paginate(issues), with: ::API::V3::Entities::Issue, current_user: current_user
         end
       end
 
@@ -70,7 +71,7 @@ module API
       end
       resource :groups, requirements: { id: %r{[^/]+} } do
         desc 'Get a list of group issues' do
-          success ::API::Entities::Issue
+          success ::API::V3::Entities::Issue
         end
         params do
           optional :state, type: String, values: %w[opened closed all], default: 'all',
@@ -82,7 +83,7 @@ module API
 
           issues = find_issues(group_id: group.id, match_all_labels: true)
 
-          present paginate(issues), with: ::API::Entities::Issue, current_user: current_user
+          present paginate(issues), with: ::API::V3::Entities::Issue, current_user: current_user
         end
       end
 
@@ -94,7 +95,7 @@ module API
 
         desc 'Get a list of project issues' do
           detail 'iid filter is deprecated have been removed on V4'
-          success ::API::Entities::Issue
+          success ::API::V3::Entities::Issue
         end
         params do
           optional :state, type: String, values: %w[opened closed all], default: 'all',
@@ -107,22 +108,22 @@ module API
 
           issues = find_issues(project_id: project.id)
 
-          present paginate(issues), with: ::API::Entities::Issue, current_user: current_user, project: user_project
+          present paginate(issues), with: ::API::V3::Entities::Issue, current_user: current_user, project: user_project
         end
 
         desc 'Get a single project issue' do
-          success ::API::Entities::Issue
+          success ::API::V3::Entities::Issue
         end
         params do
           requires :issue_id, type: Integer, desc: 'The ID of a project issue'
         end
         get ":id/issues/:issue_id" do
           issue = find_project_issue(params[:issue_id])
-          present issue, with: ::API::Entities::Issue, current_user: current_user, project: user_project
+          present issue, with: ::API::V3::Entities::Issue, current_user: current_user, project: user_project
         end
 
         desc 'Create a new project issue' do
-          success ::API::Entities::Issue
+          success ::API::V3::Entities::Issue
         end
         params do
           requires :title, type: String, desc: 'The title of an issue'
@@ -140,6 +141,7 @@ module API
 
           issue_params = declared_params(include_missing: false)
           issue_params = issue_params.merge(merge_request_to_resolve_discussions_of: issue_params.delete(:merge_request_for_resolving_discussions))
+          issue_params = convert_parameters_from_legacy_format(issue_params)
 
           issue = ::Issues::CreateService.new(user_project,
                                               current_user,
@@ -147,14 +149,14 @@ module API
           render_spam_error! if issue.spam?
 
           if issue.valid?
-            present issue, with: ::API::Entities::Issue, current_user: current_user, project: user_project
+            present issue, with: ::API::V3::Entities::Issue, current_user: current_user, project: user_project
           else
             render_validation_error!(issue)
           end
         end
 
         desc 'Update an existing issue' do
-          success ::API::Entities::Issue
+          success ::API::V3::Entities::Issue
         end
         params do
           requires :issue_id, type: Integer, desc: 'The ID of a project issue'
@@ -176,6 +178,7 @@ module API
           end
 
           update_params = declared_params(include_missing: false).merge(request: request, api: true)
+          update_params = convert_parameters_from_legacy_format(update_params)
 
           issue = ::Issues::UpdateService.new(user_project,
                                               current_user,
@@ -184,14 +187,14 @@ module API
           render_spam_error! if issue.spam?
 
           if issue.valid?
-            present issue, with: ::API::Entities::Issue, current_user: current_user, project: user_project
+            present issue, with: ::API::V3::Entities::Issue, current_user: current_user, project: user_project
           else
             render_validation_error!(issue)
           end
         end
 
         desc 'Move an existing issue' do
-          success ::API::Entities::Issue
+          success ::API::V3::Entities::Issue
         end
         params do
           requires :issue_id, type: Integer, desc: 'The ID of a project issue'
@@ -206,7 +209,7 @@ module API
 
           begin
             issue = ::Issues::MoveService.new(user_project, current_user).execute(issue, new_project)
-            present issue, with: ::API::Entities::Issue, current_user: current_user, project: user_project
+            present issue, with: ::API::V3::Entities::Issue, current_user: current_user, project: user_project
           rescue ::Issues::MoveService::MoveError => error
             render_api_error!(error.message, 400)
           end
diff --git a/lib/api/v3/merge_requests.rb b/lib/api/v3/merge_requests.rb
index 1616142a619..b6b7254ae29 100644
--- a/lib/api/v3/merge_requests.rb
+++ b/lib/api/v3/merge_requests.rb
@@ -34,7 +34,7 @@ module API
             if project.has_external_issue_tracker?
               ::API::Entities::ExternalIssue
             else
-              ::API::Entities::Issue
+              ::API::V3::Entities::Issue
             end
           end
 
diff --git a/lib/api/v3/milestones.rb b/lib/api/v3/milestones.rb
index be90cec4afc..4c7061d4939 100644
--- a/lib/api/v3/milestones.rb
+++ b/lib/api/v3/milestones.rb
@@ -39,7 +39,7 @@ module API
         end
 
         desc 'Get all issues for a single project milestone' do
-          success ::API::Entities::Issue
+          success ::API::V3::Entities::Issue
         end
         params do
           requires :milestone_id, type: Integer, desc: 'The ID of a project milestone'
@@ -56,7 +56,7 @@ module API
           }
 
           issues = IssuesFinder.new(current_user, finder_params).execute
-          present paginate(issues), with: ::API::Entities::Issue, current_user: current_user, project: user_project
+          present paginate(issues), with: ::API::V3::Entities::Issue, current_user: current_user, project: user_project
         end
       end
     end
diff --git a/lib/banzai/reference_parser/issue_parser.rb b/lib/banzai/reference_parser/issue_parser.rb
index e02b360924a..89ec715ddf6 100644
--- a/lib/banzai/reference_parser/issue_parser.rb
+++ b/lib/banzai/reference_parser/issue_parser.rb
@@ -28,7 +28,7 @@ module Banzai
           nodes,
           Issue.all.includes(
             :author,
-            :assignee,
+            :assignees,
             {
               # These associations are primarily used for checking permissions.
               # Eager loading these ensures we don't end up running dozens of
diff --git a/lib/constraints/group_url_constrainer.rb b/lib/constraints/group_url_constrainer.rb
index 1501f64d537..5f379756c11 100644
--- a/lib/constraints/group_url_constrainer.rb
+++ b/lib/constraints/group_url_constrainer.rb
@@ -4,6 +4,6 @@ class GroupUrlConstrainer
 
     return false unless DynamicPathValidator.valid?(id)
 
-    Group.find_by_full_path(id).present?
+    Group.find_by_full_path(id, follow_redirects: request.get?).present?
   end
 end
diff --git a/lib/constraints/project_url_constrainer.rb b/lib/constraints/project_url_constrainer.rb
index d0ce2caffff..6f542f63f98 100644
--- a/lib/constraints/project_url_constrainer.rb
+++ b/lib/constraints/project_url_constrainer.rb
@@ -6,6 +6,6 @@ class ProjectUrlConstrainer
 
     return false unless DynamicPathValidator.valid?(full_path)
 
-    Project.find_by_full_path(full_path).present?
+    Project.find_by_full_path(full_path, follow_redirects: request.get?).present?
   end
 end
diff --git a/lib/constraints/user_url_constrainer.rb b/lib/constraints/user_url_constrainer.rb
index 9ab5bcb12ff..28159dc0dec 100644
--- a/lib/constraints/user_url_constrainer.rb
+++ b/lib/constraints/user_url_constrainer.rb
@@ -1,5 +1,5 @@
 class UserUrlConstrainer
   def matches?(request)
-    User.find_by_username(request.params[:username]).present?
+    User.find_by_full_path(request.params[:username], follow_redirects: request.get?).present?
   end
 end
diff --git a/lib/github/import.rb b/lib/github/import.rb
index d49761fd6c6..06beb607a3e 100644
--- a/lib/github/import.rb
+++ b/lib/github/import.rb
@@ -245,7 +245,7 @@ module Github
               issue.label_ids    = label_ids(representation.labels)
               issue.milestone_id = milestone_id(representation.milestone)
               issue.author_id    = author_id
-              issue.assignee_id  = user_id(representation.assignee)
+              issue.assignee_ids = [user_id(representation.assignee)]
               issue.created_at   = representation.created_at
               issue.updated_at   = representation.updated_at
               issue.save!(validate: false)
diff --git a/lib/gitlab/chat_commands/presenters/issue_base.rb b/lib/gitlab/chat_commands/presenters/issue_base.rb
index 054f7f4be0c..25bc82994ba 100644
--- a/lib/gitlab/chat_commands/presenters/issue_base.rb
+++ b/lib/gitlab/chat_commands/presenters/issue_base.rb
@@ -22,7 +22,7 @@ module Gitlab
           [
             {
               title: "Assignee",
-              value: @resource.assignee ? @resource.assignee.name : "_None_",
+              value: @resource.assignees.any? ? @resource.assignees.first.name : "_None_",
               short: true
             },
             {
diff --git a/lib/gitlab/ci/status/group/common.rb b/lib/gitlab/ci/status/group/common.rb
new file mode 100644
index 00000000000..cfd4329a923
--- /dev/null
+++ b/lib/gitlab/ci/status/group/common.rb
@@ -0,0 +1,21 @@
+module Gitlab
+  module Ci
+    module Status
+      module Group
+        module Common
+          def has_details?
+            false
+          end
+
+          def details_path
+            nil
+          end
+
+          def has_action?
+            false
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/ci/status/group/factory.rb b/lib/gitlab/ci/status/group/factory.rb
new file mode 100644
index 00000000000..d118116cfc3
--- /dev/null
+++ b/lib/gitlab/ci/status/group/factory.rb
@@ -0,0 +1,13 @@
+module Gitlab
+  module Ci
+    module Status
+      module Group
+        class Factory < Status::Factory
+          def self.common_helpers
+            Status::Group::Common
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/etag_caching/router.rb b/lib/gitlab/etag_caching/router.rb
index aac210f19e8..692c909d838 100644
--- a/lib/gitlab/etag_caching/router.rb
+++ b/lib/gitlab/etag_caching/router.rb
@@ -36,7 +36,11 @@ module Gitlab
         Gitlab::EtagCaching::Router::Route.new(
           %r(^(?!.*(#{RESERVED_WORDS_REGEX})).*/pipelines\.json\z),
           'project_pipelines'
-        )
+        ),
+        Gitlab::EtagCaching::Router::Route.new(
+          %r(^(?!.*(#{RESERVED_WORDS})).*/pipelines/\d+\.json\z),
+          'project_pipeline'
+        ),
       ].freeze
 
       def self.match(env)
diff --git a/lib/gitlab/fogbugz_import/importer.rb b/lib/gitlab/fogbugz_import/importer.rb
index 222bcdcbf9c..3dcee681c72 100644
--- a/lib/gitlab/fogbugz_import/importer.rb
+++ b/lib/gitlab/fogbugz_import/importer.rb
@@ -122,15 +122,15 @@ module Gitlab
           author_id = user_info(bug['ixPersonOpenedBy'])[:gitlab_id] || project.creator_id
 
           issue = Issue.create!(
-            iid:         bug['ixBug'],
-            project_id:  project.id,
-            title:       bug['sTitle'],
-            description: body,
-            author_id:   author_id,
-            assignee_id: assignee_id,
-            state:       bug['fOpen'] == 'true' ? 'opened' : 'closed',
-            created_at:  date,
-            updated_at:  DateTime.parse(bug['dtLastUpdated'])
+            iid:          bug['ixBug'],
+            project_id:   project.id,
+            title:        bug['sTitle'],
+            description:  body,
+            author_id:    author_id,
+            assignee_ids: [assignee_id],
+            state:        bug['fOpen'] == 'true' ? 'opened' : 'closed',
+            created_at:   date,
+            updated_at:   DateTime.parse(bug['dtLastUpdated'])
           )
 
           issue_labels = ::LabelsFinder.new(nil, project_id: project.id, title: labels).execute(skip_authorization: true)
diff --git a/lib/gitlab/git_post_receive.rb b/lib/gitlab/git_post_receive.rb
index 6babea144c7..0e14253ab4e 100644
--- a/lib/gitlab/git_post_receive.rb
+++ b/lib/gitlab/git_post_receive.rb
@@ -1,25 +1,12 @@
 module Gitlab
   class GitPostReceive
     include Gitlab::Identifier
-    attr_reader :repo_path, :identifier, :changes, :project
+    attr_reader :project, :identifier, :changes
 
-    def initialize(repo_path, identifier, changes)
-      repo_path.gsub!(/\.git\z/, '')
-      repo_path.gsub!(/\A\//, '')
-
-      @repo_path = repo_path
+    def initialize(project, identifier, changes)
+      @project = project
       @identifier = identifier
       @changes = deserialize_changes(changes)
-
-      retrieve_project_and_type
-    end
-
-    def wiki?
-      @type == :wiki
-    end
-
-    def regular_project?
-      @type == :project
     end
 
     def identify(revision)
@@ -28,16 +15,6 @@ module Gitlab
 
     private
 
-    def retrieve_project_and_type
-      @type = :project
-      @project = Project.find_by_full_path(@repo_path)
-
-      if @repo_path.end_with?('.wiki') && !@project
-        @type = :wiki
-        @project = Project.find_by_full_path(@repo_path.gsub(/\.wiki\z/, ''))
-      end
-    end
-
     def deserialize_changes(changes)
       changes = utf8_encode_changes(changes)
       changes.lines
diff --git a/lib/gitlab/github_import/issue_formatter.rb b/lib/gitlab/github_import/issue_formatter.rb
index 6f5ac4dac0d..977cd0423ba 100644
--- a/lib/gitlab/github_import/issue_formatter.rb
+++ b/lib/gitlab/github_import/issue_formatter.rb
@@ -10,7 +10,7 @@ module Gitlab
           description: description,
           state: state,
           author_id: author_id,
-          assignee_id: assignee_id,
+          assignee_ids: Array(assignee_id),
           created_at: raw_data.created_at,
           updated_at: raw_data.updated_at
         }
diff --git a/lib/gitlab/gl_repository.rb b/lib/gitlab/gl_repository.rb
new file mode 100644
index 00000000000..07c0abcce23
--- /dev/null
+++ b/lib/gitlab/gl_repository.rb
@@ -0,0 +1,20 @@
+module Gitlab
+  module GlRepository
+    def self.gl_repository(project, is_wiki)
+      "#{is_wiki ? 'wiki' : 'project'}-#{project.id}"
+    end
+
+    def self.parse(gl_repository)
+      match_data = /\A(project|wiki)-([1-9][0-9]*)\z/.match(gl_repository)
+      unless match_data
+        raise ArgumentError, "Invalid GL Repository \"#{gl_repository}\""
+      end
+
+      type, id = match_data.captures
+      project = Project.find_by(id: id)
+      wiki = type == 'wiki'
+
+      [project, wiki]
+    end
+  end
+end
diff --git a/lib/gitlab/gon_helper.rb b/lib/gitlab/gon_helper.rb
index 5ab84266b7d..26473f99bc3 100644
--- a/lib/gitlab/gon_helper.rb
+++ b/lib/gitlab/gon_helper.rb
@@ -10,6 +10,8 @@ module Gitlab
       gon.user_color_scheme      = Gitlab::ColorSchemes.for_user(current_user).css_class
       gon.katex_css_url          = ActionController::Base.helpers.asset_path('katex.css')
       gon.katex_js_url           = ActionController::Base.helpers.asset_path('katex.js')
+      gon.sentry_dsn             = current_application_settings.clientside_sentry_dsn if current_application_settings.clientside_sentry_enabled
+      gon.gitlab_url             = Gitlab.config.gitlab.url
 
       if current_user
         gon.current_user_id = current_user.id
diff --git a/lib/gitlab/google_code_import/importer.rb b/lib/gitlab/google_code_import/importer.rb
index 5ca3e6a95ca..1b43440673c 100644
--- a/lib/gitlab/google_code_import/importer.rb
+++ b/lib/gitlab/google_code_import/importer.rb
@@ -108,13 +108,13 @@ module Gitlab
           end
 
           issue = Issue.create!(
-            iid:         raw_issue['id'],
-            project_id:  project.id,
-            title:       raw_issue['title'],
-            description: body,
-            author_id:   project.creator_id,
-            assignee_id: assignee_id,
-            state:       raw_issue['state'] == 'closed' ? 'closed' : 'opened'
+            iid:          raw_issue['id'],
+            project_id:   project.id,
+            title:        raw_issue['title'],
+            description:  body,
+            author_id:    project.creator_id,
+            assignee_ids: [assignee_id],
+            state:        raw_issue['state'] == 'closed' ? 'closed' : 'opened'
           )
 
           issue_labels = ::LabelsFinder.new(nil, project_id: project.id, title: labels).execute(skip_authorization: true)
diff --git a/lib/gitlab/import_export/import_export.yml b/lib/gitlab/import_export/import_export.yml
index 3aac731e844..5f757f99fb3 100644
--- a/lib/gitlab/import_export/import_export.yml
+++ b/lib/gitlab/import_export/import_export.yml
@@ -85,6 +85,8 @@ excluded_attributes:
     - :id
     - :star_count
     - :last_activity_at
+    - :last_repository_updated_at
+    - :last_repository_check_at
   snippets:
     - :expired_at
   merge_request_diff:
diff --git a/lib/gitlab/import_export/relation_factory.rb b/lib/gitlab/import_export/relation_factory.rb
index 4a54e7ef2e7..956763fa399 100644
--- a/lib/gitlab/import_export/relation_factory.rb
+++ b/lib/gitlab/import_export/relation_factory.rb
@@ -15,7 +15,7 @@ module Gitlab
                     priorities: :label_priorities,
                     label: :project_label }.freeze
 
-      USER_REFERENCES = %w[author_id assignee_id updated_by_id user_id created_by_id merge_user_id resolved_by_id].freeze
+      USER_REFERENCES = %w[author_id assignee_id updated_by_id user_id created_by_id last_edited_by_id merge_user_id resolved_by_id].freeze
 
       PROJECT_REFERENCES = %w[project_id source_project_id target_project_id].freeze
 
diff --git a/lib/gitlab/repo_path.rb b/lib/gitlab/repo_path.rb
index 4b1d828c45c..878e03f61d7 100644
--- a/lib/gitlab/repo_path.rb
+++ b/lib/gitlab/repo_path.rb
@@ -2,18 +2,29 @@ module Gitlab
   module RepoPath
     NotFoundError = Class.new(StandardError)
 
-    def self.strip_storage_path(repo_path)
-      result = nil
+    def self.parse(repo_path)
+      project_path = strip_storage_path(repo_path.sub(/\.git\z/, ''), fail_on_not_found: false)
+      project = Project.find_by_full_path(project_path)
+      if project_path.end_with?('.wiki') && !project
+        project = Project.find_by_full_path(project_path.chomp('.wiki'))
+        wiki = true
+      else
+        wiki = false
+      end
+
+      [project, wiki]
+    end
+
+    def self.strip_storage_path(repo_path, fail_on_not_found: true)
+      result = repo_path
 
-      Gitlab.config.repositories.storages.values.each do |params|
-        storage_path = params['path']
-        if repo_path.start_with?(storage_path)
-          result = repo_path.sub(storage_path, '')
-          break
-        end
+      storage = Gitlab.config.repositories.storages.values.find do |params|
+        repo_path.start_with?(params['path'])
       end
 
-      if result.nil?
+      if storage
+        result = result.sub(storage['path'], '')
+      elsif fail_on_not_found
         raise NotFoundError.new("No known storage path matches #{repo_path.inspect}")
       end
 
diff --git a/lib/gitlab/workhorse.rb b/lib/gitlab/workhorse.rb
index c551f939df1..8c5ad01e8c2 100644
--- a/lib/gitlab/workhorse.rb
+++ b/lib/gitlab/workhorse.rb
@@ -16,15 +16,17 @@ module Gitlab
     SECRET_LENGTH = 32
 
     class << self
-      def git_http_ok(repository, user, action)
+      def git_http_ok(repository, is_wiki, user, action)
+        project = repository.project
         repo_path = repository.path_to_repo
         params = {
           GL_ID: Gitlab::GlId.gl_id(user),
+          GL_REPOSITORY: Gitlab::GlRepository.gl_repository(project, is_wiki),
           RepoPath: repo_path,
         }
 
         if Gitlab.config.gitaly.enabled
-          address = Gitlab::GitalyClient.get_address(repository.project.repository_storage)
+          address = Gitlab::GitalyClient.get_address(project.repository_storage)
           params[:Repository] = repository.gitaly_repository.to_h
 
           feature_enabled = case action.to_s
diff --git a/lib/tasks/migrate/setup_postgresql.rake b/lib/tasks/migrate/setup_postgresql.rake
index 8938bc515f5..1e00b47303d 100644
--- a/lib/tasks/migrate/setup_postgresql.rake
+++ b/lib/tasks/migrate/setup_postgresql.rake
@@ -11,4 +11,5 @@ task setup_postgresql: :environment do
   AddUsersLowerUsernameEmailIndexes.new.up
   AddLowerPathIndexToRoutes.new.up
   IndexRoutesPathForLike.new.up
+  IndexRedirectRoutesPathForLike.new.up
 end
diff --git a/package.json b/package.json
index 63b2c190269..800327d8a08 100644
--- a/package.json
+++ b/package.json
@@ -40,9 +40,11 @@
     "pikaday": "^1.5.1",
     "prismjs": "^1.6.0",
     "raphael": "^2.2.7",
+    "raven-js": "^3.14.0",
     "raw-loader": "^0.5.1",
     "react-dev-utils": "^0.5.2",
     "select2": "3.5.2-browserify",
+    "sql.js": "^0.4.0",
     "stats-webpack-plugin": "^0.4.3",
     "three": "^0.84.0",
     "three-orbit-controls": "^82.1.0",
diff --git a/spec/controllers/admin/services_controller_spec.rb b/spec/controllers/admin/services_controller_spec.rb
index e5cdd52307e..c94616d8508 100644
--- a/spec/controllers/admin/services_controller_spec.rb
+++ b/spec/controllers/admin/services_controller_spec.rb
@@ -23,4 +23,36 @@ describe Admin::ServicesController do
       end
     end
   end
+
+  describe "#update" do
+    let(:project) { create(:empty_project) }
+    let!(:service) do
+      RedmineService.create(
+        project: project,
+        active: false,
+        template: true,
+        properties: {
+          project_url: 'http://abc',
+          issues_url: 'http://abc',
+          new_issue_url: 'http://abc'
+        }
+      )
+    end
+
+    it 'calls the propagation worker when service is active' do
+      expect(PropagateServiceTemplateWorker).to receive(:perform_async).with(service.id)
+
+      put :update, id: service.id, service: { active: true }
+
+      expect(response).to have_http_status(302)
+    end
+
+    it 'does not call the propagation worker when service is not active' do
+      expect(PropagateServiceTemplateWorker).not_to receive(:perform_async)
+
+      put :update, id: service.id, service: { properties: {} }
+
+      expect(response).to have_http_status(302)
+    end
+  end
 end
diff --git a/spec/controllers/application_controller_spec.rb b/spec/controllers/application_controller_spec.rb
index 1bf0533ca24..d40aae04fc3 100644
--- a/spec/controllers/application_controller_spec.rb
+++ b/spec/controllers/application_controller_spec.rb
@@ -106,10 +106,9 @@ describe ApplicationController do
       controller.send(:route_not_found)
     end
 
-    it 'does redirect to login page if not authenticated' do
+    it 'does redirect to login page via authenticate_user! if not authenticated' do
       allow(controller).to receive(:current_user).and_return(nil)
-      expect(controller).to receive(:redirect_to)
-      expect(controller).to receive(:new_user_session_path)
+      expect(controller).to receive(:authenticate_user!)
       controller.send(:route_not_found)
     end
   end
diff --git a/spec/controllers/dashboard/todos_controller_spec.rb b/spec/controllers/dashboard/todos_controller_spec.rb
index 762e90f4a16..085f3fd8543 100644
--- a/spec/controllers/dashboard/todos_controller_spec.rb
+++ b/spec/controllers/dashboard/todos_controller_spec.rb
@@ -14,7 +14,7 @@ describe Dashboard::TodosController do
   describe 'GET #index' do
     context 'when using pagination' do
       let(:last_page) { user.todos.page.total_pages }
-      let!(:issues) { create_list(:issue, 2, project: project, assignee: user) }
+      let!(:issues) { create_list(:issue, 2, project: project, assignees: [user]) }
 
       before do
         issues.each { |issue| todo_service.new_issue(issue, user) }
diff --git a/spec/controllers/groups_controller_spec.rb b/spec/controllers/groups_controller_spec.rb
index cad82a34fb0..073b87a1cb4 100644
--- a/spec/controllers/groups_controller_spec.rb
+++ b/spec/controllers/groups_controller_spec.rb
@@ -49,6 +49,26 @@ describe GroupsController do
         expect(assigns(:issues)).to eq [issue_2, issue_1]
       end
     end
+
+    context 'when requesting the canonical path with different casing' do
+      it 'redirects to the correct casing' do
+        get :issues, id: group.to_param.upcase
+
+        expect(response).to redirect_to(issues_group_path(group.to_param))
+        expect(controller).not_to set_flash[:notice]
+      end
+    end
+
+    context 'when requesting a redirected path' do
+      let(:redirect_route) { group.redirect_routes.create(path: 'old-path') }
+
+      it 'redirects to the canonical path' do
+        get :issues, id: redirect_route.path
+
+        expect(response).to redirect_to(issues_group_path(group.to_param))
+        expect(controller).to set_flash[:notice].to(/moved/)
+      end
+    end
   end
 
   describe 'GET #merge_requests' do
@@ -74,6 +94,26 @@ describe GroupsController do
         expect(assigns(:merge_requests)).to eq [merge_request_2, merge_request_1]
       end
     end
+
+    context 'when requesting the canonical path with different casing' do
+      it 'redirects to the correct casing' do
+        get :merge_requests, id: group.to_param.upcase
+
+        expect(response).to redirect_to(merge_requests_group_path(group.to_param))
+        expect(controller).not_to set_flash[:notice]
+      end
+    end
+
+    context 'when requesting a redirected path' do
+      let(:redirect_route) { group.redirect_routes.create(path: 'old-path') }
+
+      it 'redirects to the canonical path' do
+        get :merge_requests, id: redirect_route.path
+
+        expect(response).to redirect_to(merge_requests_group_path(group.to_param))
+        expect(controller).to set_flash[:notice].to(/moved/)
+      end
+    end
   end
 
   describe 'DELETE #destroy' do
@@ -81,7 +121,7 @@ describe GroupsController do
       it 'returns 404' do
         sign_in(create(:user))
 
-        delete :destroy, id: group.path
+        delete :destroy, id: group.to_param
 
         expect(response.status).to eq(404)
       end
@@ -94,15 +134,39 @@ describe GroupsController do
 
       it 'schedules a group destroy' do
         Sidekiq::Testing.fake! do
-          expect { delete :destroy, id: group.path }.to change(GroupDestroyWorker.jobs, :size).by(1)
+          expect { delete :destroy, id: group.to_param }.to change(GroupDestroyWorker.jobs, :size).by(1)
         end
       end
 
       it 'redirects to the root path' do
-        delete :destroy, id: group.path
+        delete :destroy, id: group.to_param
 
         expect(response).to redirect_to(root_path)
       end
+
+      context 'when requesting the canonical path with different casing' do
+        it 'does not 404' do
+          delete :destroy, id: group.to_param.upcase
+
+          expect(response).not_to have_http_status(404)
+        end
+
+        it 'does not redirect to the correct casing' do
+          delete :destroy, id: group.to_param.upcase
+
+          expect(response).not_to redirect_to(group_path(group.to_param))
+        end
+      end
+
+      context 'when requesting a redirected path' do
+        let(:redirect_route) { group.redirect_routes.create(path: 'old-path') }
+
+        it 'returns not found' do
+          delete :destroy, id: redirect_route.path
+
+          expect(response).to have_http_status(404)
+        end
+      end
     end
   end
 
@@ -111,7 +175,7 @@ describe GroupsController do
       sign_in(user)
     end
 
-    it 'updates the path succesfully' do
+    it 'updates the path successfully' do
       post :update, id: group.to_param, group: { path: 'new_path' }
 
       expect(response).to have_http_status(302)
@@ -125,5 +189,29 @@ describe GroupsController do
       expect(assigns(:group).errors).not_to be_empty
       expect(assigns(:group).path).not_to eq('new_path')
     end
+
+    context 'when requesting the canonical path with different casing' do
+      it 'does not 404' do
+        post :update, id: group.to_param.upcase, group: { path: 'new_path' }
+
+        expect(response).not_to have_http_status(404)
+      end
+
+      it 'does not redirect to the correct casing' do
+        post :update, id: group.to_param.upcase, group: { path: 'new_path' }
+
+        expect(response).not_to redirect_to(group_path(group.to_param))
+      end
+    end
+
+    context 'when requesting a redirected path' do
+      let(:redirect_route) { group.redirect_routes.create(path: 'old-path') }
+
+      it 'returns not found' do
+        post :update, id: redirect_route.path, group: { path: 'new_path' }
+
+        expect(response).to have_http_status(404)
+      end
+    end
   end
 end
diff --git a/spec/controllers/projects/boards/issues_controller_spec.rb b/spec/controllers/projects/boards/issues_controller_spec.rb
index 15667e8d4b1..dc3b72c6de4 100644
--- a/spec/controllers/projects/boards/issues_controller_spec.rb
+++ b/spec/controllers/projects/boards/issues_controller_spec.rb
@@ -34,7 +34,7 @@ describe Projects::Boards::IssuesController do
           issue = create(:labeled_issue, project: project, labels: [planning])
           create(:labeled_issue, project: project, labels: [planning])
           create(:labeled_issue, project: project, labels: [development], due_date: Date.tomorrow)
-          create(:labeled_issue, project: project, labels: [development], assignee: johndoe)
+          create(:labeled_issue, project: project, labels: [development], assignees: [johndoe])
           issue.subscribe(johndoe, project)
 
           list_issues user: user, board: board, list: list2
diff --git a/spec/controllers/projects/issues_controller_spec.rb b/spec/controllers/projects/issues_controller_spec.rb
index 5f1f892821a..1f79e72495a 100644
--- a/spec/controllers/projects/issues_controller_spec.rb
+++ b/spec/controllers/projects/issues_controller_spec.rb
@@ -173,12 +173,12 @@ describe Projects::IssuesController do
           namespace_id: project.namespace.to_param,
           project_id: project,
           id: issue.iid,
-          issue: { assignee_id: assignee.id },
+          issue: { assignee_ids: [assignee.id] },
           format: :json
         body = JSON.parse(response.body)
 
-        expect(body['assignee'].keys)
-          .to match_array(%w(name username avatar_url))
+        expect(body['assignees'].first.keys)
+          .to match_array(%w(id name username avatar_url))
       end
     end
 
@@ -348,7 +348,7 @@ describe Projects::IssuesController do
     let(:admin) { create(:admin) }
     let!(:issue) { create(:issue, project: project) }
     let!(:unescaped_parameter_value) { create(:issue, :confidential, project: project, author: author) }
-    let!(:request_forgery_timing_attack) { create(:issue, :confidential, project: project, assignee: assignee) }
+    let!(:request_forgery_timing_attack) { create(:issue, :confidential, project: project, assignees: [assignee]) }
 
     describe 'GET #index' do
       it 'does not list confidential issues for guests' do
diff --git a/spec/controllers/projects/merge_requests_controller_spec.rb b/spec/controllers/projects/merge_requests_controller_spec.rb
index a793da4162a..0483c6b7879 100644
--- a/spec/controllers/projects/merge_requests_controller_spec.rb
+++ b/spec/controllers/projects/merge_requests_controller_spec.rb
@@ -1067,7 +1067,7 @@ describe Projects::MergeRequestsController do
     end
 
     it 'correctly pluralizes flash message on success' do
-      issue2.update!(assignee: user)
+      issue2.assignees = [user]
 
       post_assign_issues
 
diff --git a/spec/controllers/projects/pipelines_controller_spec.rb b/spec/controllers/projects/pipelines_controller_spec.rb
index 1b47d163c0b..fb4a4721a58 100644
--- a/spec/controllers/projects/pipelines_controller_spec.rb
+++ b/spec/controllers/projects/pipelines_controller_spec.rb
@@ -1,6 +1,8 @@
 require 'spec_helper'
 
 describe Projects::PipelinesController do
+  include ApiHelpers
+
   let(:user) { create(:user) }
   let(:project) { create(:empty_project, :public) }
 
@@ -24,6 +26,7 @@ describe Projects::PipelinesController do
 
     it 'returns JSON with serialized pipelines' do
       expect(response).to have_http_status(:ok)
+      expect(response).to match_response_schema('pipeline')
 
       expect(json_response).to include('pipelines')
       expect(json_response['pipelines'].count).to eq 4
@@ -34,6 +37,34 @@ describe Projects::PipelinesController do
     end
   end
 
+  describe 'GET show JSON' do
+    let!(:pipeline) { create(:ci_pipeline_with_one_job, project: project) }
+
+    it 'returns the pipeline' do
+      get_pipeline_json
+
+      expect(response).to have_http_status(:ok)
+      expect(json_response).not_to be_an(Array)
+      expect(json_response['id']).to be(pipeline.id)
+      expect(json_response['details']).to have_key 'stages'
+    end
+
+    context 'when the pipeline has multiple jobs' do
+      it 'does not perform N + 1 queries' do
+        control_count = ActiveRecord::QueryRecorder.new { get_pipeline_json }.count
+
+        create(:ci_build, pipeline: pipeline)
+
+        # The plus 2 is needed to group and sort
+        expect { get_pipeline_json }.not_to exceed_query_limit(control_count + 2)
+      end
+    end
+
+    def get_pipeline_json
+      get :show, namespace_id: project.namespace, project_id: project, id: pipeline, format: :json
+    end
+  end
+
   describe 'GET stages.json' do
     let(:pipeline) { create(:ci_pipeline, project: project) }
 
diff --git a/spec/controllers/projects_controller_spec.rb b/spec/controllers/projects_controller_spec.rb
index eafc2154568..e46ef447df2 100644
--- a/spec/controllers/projects_controller_spec.rb
+++ b/spec/controllers/projects_controller_spec.rb
@@ -185,6 +185,7 @@ describe ProjectsController do
 
           expect(assigns(:project)).to eq(public_project)
           expect(response).to redirect_to("/#{public_project.full_path}")
+          expect(controller).not_to set_flash[:notice]
         end
       end
     end
@@ -218,19 +219,33 @@ describe ProjectsController do
         expect(response).to redirect_to(namespace_project_path)
       end
     end
+
+    context 'when requesting a redirected path' do
+      let!(:redirect_route) { public_project.redirect_routes.create!(path: "foo/bar") }
+
+      it 'redirects to the canonical path' do
+        get :show, namespace_id: 'foo', id: 'bar'
+
+        expect(response).to redirect_to(public_project)
+        expect(controller).to set_flash[:notice].to(/moved/)
+      end
+    end
   end
 
   describe "#update" do
     render_views
 
     let(:admin) { create(:admin) }
+    let(:project) { create(:project, :repository) }
+    let(:new_path) { 'renamed_path' }
+    let(:project_params) { { path: new_path } }
+
+    before do
+      sign_in(admin)
+    end
 
     it "sets the repository to the right path after a rename" do
-      project = create(:project, :repository)
-      new_path = 'renamed_path'
-      project_params = { path: new_path }
       controller.instance_variable_set(:@project, project)
-      sign_in(admin)
 
       put :update,
           namespace_id: project.namespace,
@@ -241,6 +256,34 @@ describe ProjectsController do
       expect(assigns(:repository).path).to eq(project.repository.path)
       expect(response).to have_http_status(302)
     end
+
+    context 'when requesting the canonical path' do
+      it "is case-insensitive" do
+        controller.instance_variable_set(:@project, project)
+
+        put :update,
+            namespace_id: 'FOo',
+            id: 'baR',
+            project: project_params
+
+        expect(project.repository.path).to include(new_path)
+        expect(assigns(:repository).path).to eq(project.repository.path)
+        expect(response).to have_http_status(302)
+      end
+    end
+
+    context 'when requesting a redirected path' do
+      let!(:redirect_route) { project.redirect_routes.create!(path: "foo/bar") }
+
+      it 'returns not found' do
+        put :update,
+            namespace_id: 'foo',
+            id: 'bar',
+            project: project_params
+
+        expect(response).to have_http_status(404)
+      end
+    end
   end
 
   describe "#destroy" do
@@ -276,6 +319,31 @@ describe ProjectsController do
         expect(merge_request.reload.state).to eq('closed')
       end
     end
+
+    context 'when requesting the canonical path' do
+      it "is case-insensitive" do
+        controller.instance_variable_set(:@project, project)
+        sign_in(admin)
+
+        orig_id = project.id
+        delete :destroy, namespace_id: project.namespace, id: project.path.upcase
+
+        expect { Project.find(orig_id) }.to raise_error(ActiveRecord::RecordNotFound)
+        expect(response).to have_http_status(302)
+        expect(response).to redirect_to(dashboard_projects_path)
+      end
+    end
+
+    context 'when requesting a redirected path' do
+      let!(:redirect_route) { project.redirect_routes.create!(path: "foo/bar") }
+
+      it 'returns not found' do
+        sign_in(admin)
+        delete :destroy, namespace_id: 'foo', id: 'bar'
+
+        expect(response).to have_http_status(404)
+      end
+    end
   end
 
   describe 'PUT #new_issue_address' do
@@ -397,6 +465,17 @@ describe ProjectsController do
       expect(parsed_body["Tags"]).to include("v1.0.0")
       expect(parsed_body["Commits"]).to include("123456")
     end
+
+    context 'when requesting a redirected path' do
+      let!(:redirect_route) { public_project.redirect_routes.create!(path: "foo/bar") }
+
+      it 'redirects to the canonical path' do
+        get :refs, namespace_id: 'foo', id: 'bar'
+
+        expect(response).to redirect_to(refs_namespace_project_path(namespace_id: public_project.namespace, id: public_project))
+        expect(controller).to set_flash[:notice].to(/moved/)
+      end
+    end
   end
 
   describe 'POST #preview_markdown' do
diff --git a/spec/controllers/users_controller_spec.rb b/spec/controllers/users_controller_spec.rb
index bbe9aaf737f..74c5aa44ba9 100644
--- a/spec/controllers/users_controller_spec.rb
+++ b/spec/controllers/users_controller_spec.rb
@@ -4,15 +4,6 @@ describe UsersController do
   let(:user) { create(:user) }
 
   describe 'GET #show' do
-    it 'is case-insensitive' do
-      user = create(:user, username: 'CamelCaseUser')
-      sign_in(user)
-
-      get :show, username: user.username.downcase
-
-      expect(response).to be_success
-    end
-
     context 'with rendered views' do
       render_views
 
@@ -45,9 +36,9 @@ describe UsersController do
       end
 
       context 'when logged out' do
-        it 'renders 404' do
+        it 'redirects to login page' do
           get :show, username: user.username
-          expect(response).to have_http_status(404)
+          expect(response).to redirect_to new_user_session_path
         end
       end
 
@@ -61,6 +52,58 @@ describe UsersController do
         end
       end
     end
+
+    context 'when requesting the canonical path' do
+      let(:user) { create(:user, username: 'CamelCaseUser') }
+
+      before { sign_in(user) }
+
+      context 'with exactly matching casing' do
+        it 'responds with success' do
+          get :show, username: user.username
+
+          expect(response).to be_success
+        end
+      end
+
+      context 'with different casing' do
+        it 'redirects to the correct casing' do
+          get :show, username: user.username.downcase
+
+          expect(response).to redirect_to(user)
+          expect(controller).not_to set_flash[:notice]
+        end
+      end
+    end
+
+    context 'when requesting a redirected path' do
+      let(:redirect_route) { user.namespace.redirect_routes.create(path: 'old-username') }
+
+      it 'redirects to the canonical path' do
+        get :show, username: redirect_route.path
+
+        expect(response).to redirect_to(user)
+        expect(controller).to set_flash[:notice].to(/moved/)
+      end
+    end
+
+    context 'when a user by that username does not exist' do
+      context 'when logged out' do
+        it 'redirects to login page' do
+          get :show, username: 'nonexistent'
+          expect(response).to redirect_to new_user_session_path
+        end
+      end
+
+      context 'when logged in' do
+        before { sign_in(user) }
+
+        it 'renders 404' do
+          get :show, username: 'nonexistent'
+          expect(response).to have_http_status(404)
+        end
+      end
+    end
   end
 
   describe 'GET #calendar' do
@@ -88,11 +131,45 @@ describe UsersController do
         expect(assigns(:contributions_calendar).projects.count).to eq(2)
       end
     end
+
+    context 'when requesting the canonical path' do
+      let(:user) { create(:user, username: 'CamelCaseUser') }
+
+      before { sign_in(user) }
+
+      context 'with exactly matching casing' do
+        it 'responds with success' do
+          get :calendar, username: user.username
+
+          expect(response).to be_success
+        end
+      end
+
+      context 'with different casing' do
+        it 'redirects to the correct casing' do
+          get :calendar, username: user.username.downcase
+
+          expect(response).to redirect_to(user_calendar_path(user))
+          expect(controller).not_to set_flash[:notice]
+        end
+      end
+    end
+
+    context 'when requesting a redirected path' do
+      let(:redirect_route) { user.namespace.redirect_routes.create(path: 'old-username') }
+
+      it 'redirects to the canonical path' do
+        get :calendar, username: redirect_route.path
+
+        expect(response).to redirect_to(user_calendar_path(user))
+        expect(controller).to set_flash[:notice].to(/moved/)
+      end
+    end
   end
 
   describe 'GET #calendar_activities' do
     let!(:project) { create(:empty_project) }
-    let!(:user) { create(:user) }
+    let(:user) { create(:user) }
 
     before do
       allow_any_instance_of(User).to receive(:contributed_projects_ids).and_return([project.id])
@@ -110,6 +187,38 @@ describe UsersController do
       get :calendar_activities, username: user.username
       expect(response).to render_template('calendar_activities')
     end
+
+    context 'when requesting the canonical path' do
+      let(:user) { create(:user, username: 'CamelCaseUser') }
+
+      context 'with exactly matching casing' do
+        it 'responds with success' do
+          get :calendar_activities, username: user.username
+
+          expect(response).to be_success
+        end
+      end
+
+      context 'with different casing' do
+        it 'redirects to the correct casing' do
+          get :calendar_activities, username: user.username.downcase
+
+          expect(response).to redirect_to(user_calendar_activities_path(user))
+          expect(controller).not_to set_flash[:notice]
+        end
+      end
+    end
+
+    context 'when requesting a redirected path' do
+      let(:redirect_route) { user.namespace.redirect_routes.create(path: 'old-username') }
+
+      it 'redirects to the canonical path' do
+        get :calendar_activities, username: redirect_route.path
+
+        expect(response).to redirect_to(user_calendar_activities_path(user))
+        expect(controller).to set_flash[:notice].to(/moved/)
+      end
+    end
   end
 
   describe 'GET #snippets' do
@@ -132,5 +241,83 @@ describe UsersController do
         expect(JSON.parse(response.body)).to have_key('html')
       end
     end
+
+    context 'when requesting the canonical path' do
+      let(:user) { create(:user, username: 'CamelCaseUser') }
+
+      context 'with exactly matching casing' do
+        it 'responds with success' do
+          get :snippets, username: user.username
+
+          expect(response).to be_success
+        end
+      end
+
+      context 'with different casing' do
+        it 'redirects to the correct casing' do
+          get :snippets, username: user.username.downcase
+
+          expect(response).to redirect_to(user_snippets_path(user))
+          expect(controller).not_to set_flash[:notice]
+        end
+      end
+    end
+
+    context 'when requesting a redirected path' do
+      let(:redirect_route) { user.namespace.redirect_routes.create(path: 'old-username') }
+
+      it 'redirects to the canonical path' do
+        get :snippets, username: redirect_route.path
+
+        expect(response).to redirect_to(user_snippets_path(user))
+        expect(controller).to set_flash[:notice].to(/moved/)
+      end
+    end
+  end
+
+  describe 'GET #exists' do
+    before do
+      sign_in(user)
+    end
+
+    context 'when user exists' do
+      it 'returns JSON indicating the user exists' do
+        get :exists, username: user.username
+
+        expected_json = { exists: true }.to_json
+        expect(response.body).to eq(expected_json)
+      end
+
+      context 'when the casing is different' do
+        let(:user) { create(:user, username: 'CamelCaseUser') }
+
+        it 'returns JSON indicating the user exists' do
+          get :exists, username: user.username.downcase
+
+          expected_json = { exists: true }.to_json
+          expect(response.body).to eq(expected_json)
+        end
+      end
+    end
+
+    context 'when the user does not exist' do
+      it 'returns JSON indicating the user does not exist' do
+        get :exists, username: 'foo'
+
+        expected_json = { exists: false }.to_json
+        expect(response.body).to eq(expected_json)
+      end
+
+      context 'when a user changed their username' do
+        let(:redirect_route) { user.namespace.redirect_routes.create(path: 'old-username') }
+
+        it 'returns JSON indicating a user by that username does not exist' do
+          get :exists, username: 'old-username'
+
+          expected_json = { exists: false }.to_json
+          expect(response.body).to eq(expected_json)
+        end
+      end
+    end
   end
 end
diff --git a/spec/factories/notes.rb b/spec/factories/notes.rb
index 44c3186d813..046974dcd6e 100644
--- a/spec/factories/notes.rb
+++ b/spec/factories/notes.rb
@@ -29,6 +29,8 @@ FactoryGirl.define do
 
     factory :discussion_note_on_commit, traits: [:on_commit], class: DiscussionNote
 
+    factory :discussion_note_on_personal_snippet, traits: [:on_personal_snippet], class: DiscussionNote
+
     factory :legacy_diff_note_on_commit, traits: [:on_commit, :legacy_diff_note], class: LegacyDiffNote
 
     factory :legacy_diff_note_on_merge_request, traits: [:on_merge_request, :legacy_diff_note], class: LegacyDiffNote do
diff --git a/spec/features/atom/dashboard_issues_spec.rb b/spec/features/atom/dashboard_issues_spec.rb
index 58b14e09740..9ea325ab41b 100644
--- a/spec/features/atom/dashboard_issues_spec.rb
+++ b/spec/features/atom/dashboard_issues_spec.rb
@@ -32,7 +32,7 @@ describe "Dashboard Issues Feed", feature: true  do
       end
 
       context "issue with basic fields" do
-        let!(:issue2) { create(:issue, author: user, assignee: assignee, project: project2, description: 'test desc') }
+        let!(:issue2) { create(:issue, author: user, assignees: [assignee], project: project2, description: 'test desc') }
 
         it "renders issue fields" do
           visit issues_dashboard_path(:atom, private_token: user.private_token)
@@ -41,7 +41,7 @@ describe "Dashboard Issues Feed", feature: true  do
 
           expect(entry).to be_present
           expect(entry).to have_selector('author email', text: issue2.author_public_email)
-          expect(entry).to have_selector('assignee email', text: issue2.assignee_public_email)
+          expect(entry).to have_selector('assignees email', text: assignee.public_email)
           expect(entry).not_to have_selector('labels')
           expect(entry).not_to have_selector('milestone')
           expect(entry).to have_selector('description', text: issue2.description)
@@ -51,7 +51,7 @@ describe "Dashboard Issues Feed", feature: true  do
       context "issue with label and milestone" do
         let!(:milestone1) { create(:milestone, project: project1, title: 'v1') }
         let!(:label1)     { create(:label, project: project1, title: 'label1') }
-        let!(:issue1)     { create(:issue, author: user, assignee: assignee, project: project1, milestone: milestone1) }
+        let!(:issue1)     { create(:issue, author: user, assignees: [assignee], project: project1, milestone: milestone1) }
 
         before do
           issue1.labels << label1
@@ -64,7 +64,7 @@ describe "Dashboard Issues Feed", feature: true  do
 
           expect(entry).to be_present
           expect(entry).to have_selector('author email', text: issue1.author_public_email)
-          expect(entry).to have_selector('assignee email', text: issue1.assignee_public_email)
+          expect(entry).to have_selector('assignees email', text: assignee.public_email)
           expect(entry).to have_selector('labels label', text: label1.title)
           expect(entry).to have_selector('milestone', text: milestone1.title)
           expect(entry).not_to have_selector('description')
diff --git a/spec/features/atom/issues_spec.rb b/spec/features/atom/issues_spec.rb
index b3903ec2faf..4f6754ad541 100644
--- a/spec/features/atom/issues_spec.rb
+++ b/spec/features/atom/issues_spec.rb
@@ -6,7 +6,7 @@ describe 'Issues Feed', feature: true  do
     let!(:assignee) { create(:user, email: 'private2@example.com', public_email: 'public2@example.com') }
     let!(:group)    { create(:group) }
     let!(:project)  { create(:project) }
-    let!(:issue)    { create(:issue, author: user, assignee: assignee, project: project) }
+    let!(:issue)    { create(:issue, author: user, assignees: [assignee], project: project) }
 
     before do
       project.team << [user, :developer]
@@ -22,7 +22,8 @@ describe 'Issues Feed', feature: true  do
           to have_content('application/atom+xml')
         expect(body).to have_selector('title', text: "#{project.name} issues")
         expect(body).to have_selector('author email', text: issue.author_public_email)
-        expect(body).to have_selector('assignee email', text: issue.author_public_email)
+        expect(body).to have_selector('assignees assignee email', text: issue.assignees.first.public_email)
+        expect(body).to have_selector('assignee email', text: issue.assignees.first.public_email)
         expect(body).to have_selector('entry summary', text: issue.title)
       end
     end
@@ -36,7 +37,8 @@ describe 'Issues Feed', feature: true  do
           to have_content('application/atom+xml')
         expect(body).to have_selector('title', text: "#{project.name} issues")
         expect(body).to have_selector('author email', text: issue.author_public_email)
-        expect(body).to have_selector('assignee email', text: issue.author_public_email)
+        expect(body).to have_selector('assignees assignee email', text: issue.assignees.first.public_email)
+        expect(body).to have_selector('assignee email', text: issue.assignees.first.public_email)
         expect(body).to have_selector('entry summary', text: issue.title)
       end
     end
diff --git a/spec/features/boards/boards_spec.rb b/spec/features/boards/boards_spec.rb
index a172ce1e8c0..18585488e26 100644
--- a/spec/features/boards/boards_spec.rb
+++ b/spec/features/boards/boards_spec.rb
@@ -71,7 +71,7 @@ describe 'Issue Boards', feature: true, js: true do
     let!(:list2) { create(:list, board: board, label: development, position: 1) }
 
     let!(:confidential_issue) { create(:labeled_issue, :confidential, project: project, author: user, labels: [planning], relative_position: 9) }
-    let!(:issue1) { create(:labeled_issue, project: project, assignee: user, labels: [planning], relative_position: 8) }
+    let!(:issue1) { create(:labeled_issue, project: project, assignees: [user], labels: [planning], relative_position: 8) }
     let!(:issue2) { create(:labeled_issue, project: project, author: user2, labels: [planning], relative_position: 7) }
     let!(:issue3) { create(:labeled_issue, project: project, labels: [planning], relative_position: 6) }
     let!(:issue4) { create(:labeled_issue, project: project, labels: [planning], relative_position: 5) }
diff --git a/spec/features/boards/modal_filter_spec.rb b/spec/features/boards/modal_filter_spec.rb
index 4a4c13e79c8..e1367c675e5 100644
--- a/spec/features/boards/modal_filter_spec.rb
+++ b/spec/features/boards/modal_filter_spec.rb
@@ -98,7 +98,7 @@ describe 'Issue Boards add issue modal filtering', :feature, :js do
   end
 
   context 'assignee' do
-    let!(:issue) { create(:issue, project: project, assignee: user2) }
+    let!(:issue) { create(:issue, project: project, assignees: [user2]) }
 
     before do
       project.team << [user2, :developer]
diff --git a/spec/features/boards/sidebar_spec.rb b/spec/features/boards/sidebar_spec.rb
index bafa4f05937..7c53d2b47d9 100644
--- a/spec/features/boards/sidebar_spec.rb
+++ b/spec/features/boards/sidebar_spec.rb
@@ -4,13 +4,14 @@ describe 'Issue Boards', feature: true, js: true do
   include WaitForVueResource
 
   let(:user)         { create(:user) }
+  let(:user2)        { create(:user) }
   let(:project)      { create(:empty_project, :public) }
   let!(:milestone)   { create(:milestone, project: project) }
   let!(:development) { create(:label, project: project, name: 'Development') }
   let!(:bug)         { create(:label, project: project, name: 'Bug') }
   let!(:regression)  { create(:label, project: project, name: 'Regression') }
   let!(:stretch)     { create(:label, project: project, name: 'Stretch') }
-  let!(:issue1)      { create(:labeled_issue, project: project, assignee: user, milestone: milestone, labels: [development], relative_position: 2) }
+  let!(:issue1)      { create(:labeled_issue, project: project, assignees: [user], milestone: milestone, labels: [development], relative_position: 2) }
   let!(:issue2)      { create(:labeled_issue, project: project, labels: [development, stretch], relative_position: 1) }
   let(:board)        { create(:board, project: project) }
   let!(:list)        { create(:list, board: board, label: development, position: 0) }
@@ -112,10 +113,11 @@ describe 'Issue Boards', feature: true, js: true do
 
         page.within('.dropdown-menu-user') do
           click_link 'Unassigned'
-
-          wait_for_vue_resource
         end
 
+        find('.dropdown-menu-toggle').click
+        wait_for_vue_resource
+
         expect(page).to have_content('No assignee')
       end
 
@@ -128,7 +130,7 @@ describe 'Issue Boards', feature: true, js: true do
       page.within(find('.assignee')) do
         expect(page).to have_content('No assignee')
 
-        click_link 'assign yourself'
+        click_button 'assign yourself'
 
         wait_for_vue_resource
 
@@ -138,7 +140,7 @@ describe 'Issue Boards', feature: true, js: true do
       expect(card).to have_selector('.avatar')
     end
 
-    it 'resets assignee dropdown' do
+    it 'updates assignee dropdown' do
       click_card(card)
 
       page.within('.assignee') do
@@ -162,7 +164,7 @@ describe 'Issue Boards', feature: true, js: true do
       page.within('.assignee') do
         click_link 'Edit'
 
-        expect(page).not_to have_selector('.is-active')
+        expect(page).to have_selector('.is-active')
       end
     end
   end
diff --git a/spec/features/dashboard/issuables_counter_spec.rb b/spec/features/dashboard/issuables_counter_spec.rb
index 4fca7577e74..6f7bf0eba6e 100644
--- a/spec/features/dashboard/issuables_counter_spec.rb
+++ b/spec/features/dashboard/issuables_counter_spec.rb
@@ -7,7 +7,7 @@ describe 'Navigation bar counter', feature: true, caching: true do
   let(:merge_request) { create(:merge_request, source_project: project) }
 
   before do
-    issue.update(assignee: user)
+    issue.assignees = [user]
     merge_request.update(assignee: user)
     login_as(user)
   end
@@ -17,7 +17,9 @@ describe 'Navigation bar counter', feature: true, caching: true do
 
     expect_counters('issues', '1')
 
-    issue.update(assignee: nil)
+    issue.assignees = []
+
+    user.update_cache_counts
 
     Timecop.travel(3.minutes.from_now) do
       visit issues_path
diff --git a/spec/features/dashboard/issues_spec.rb b/spec/features/dashboard/issues_spec.rb
index f4420814c3a..86c7954e60c 100644
--- a/spec/features/dashboard/issues_spec.rb
+++ b/spec/features/dashboard/issues_spec.rb
@@ -11,7 +11,7 @@ RSpec.describe 'Dashboard Issues', feature: true do
 
   let!(:authored_issue) { create :issue, author: current_user, project: project }
   let!(:authored_issue_on_public_project) { create :issue, author: current_user, project: public_project }
-  let!(:assigned_issue) { create :issue, assignee: current_user, project: project }
+  let!(:assigned_issue) { create :issue, assignees: [current_user], project: project }
   let!(:other_issue) { create :issue, project: project }
 
   before do
@@ -30,6 +30,11 @@ RSpec.describe 'Dashboard Issues', feature: true do
     find('#assignee_id', visible: false).set('')
     find('.js-author-search', match: :first).click
     find('.dropdown-menu-author li a', match: :first, text: current_user.to_reference).click
+    find('.js-author-search', match: :first).click
+
+    page.within '.dropdown-menu-user' do
+      expect(find('.dropdown-menu-author li a.is-active', match: :first, text: current_user.to_reference)).to be_visible
+    end
 
     expect(page).to have_content(authored_issue.title)
     expect(page).to have_content(authored_issue_on_public_project.title)
diff --git a/spec/features/dashboard_issues_spec.rb b/spec/features/dashboard_issues_spec.rb
index b6b87905231..ad60fb2c74f 100644
--- a/spec/features/dashboard_issues_spec.rb
+++ b/spec/features/dashboard_issues_spec.rb
@@ -10,8 +10,8 @@ describe "Dashboard Issues filtering", feature: true, js: true do
       project.team << [user, :master]
       login_as(user)
 
-      create(:issue, project: project, author: user, assignee: user)
-      create(:issue, project: project, author: user, assignee: user, milestone: milestone)
+      create(:issue, project: project, author: user, assignees: [user])
+      create(:issue, project: project, author: user, assignees: [user], milestone: milestone)
 
       visit_issues
     end
diff --git a/spec/features/gitlab_flavored_markdown_spec.rb b/spec/features/gitlab_flavored_markdown_spec.rb
index f5b54463df8..005a029a393 100644
--- a/spec/features/gitlab_flavored_markdown_spec.rb
+++ b/spec/features/gitlab_flavored_markdown_spec.rb
@@ -54,11 +54,11 @@ describe "GitLab Flavored Markdown", feature: true do
     before do
       @other_issue = create(:issue,
                             author: @user,
-                            assignee: @user,
+                            assignees: [@user],
                             project: project)
       @issue = create(:issue,
                       author: @user,
-                      assignee: @user,
+                      assignees: [@user],
                       project: project,
                       title: "fix #{@other_issue.to_reference}",
                       description: "ask #{fred.to_reference} for details")
diff --git a/spec/features/groups/group_settings_spec.rb b/spec/features/groups/group_settings_spec.rb
new file mode 100644
index 00000000000..cc25db4ad60
--- /dev/null
+++ b/spec/features/groups/group_settings_spec.rb
@@ -0,0 +1,80 @@
+require 'spec_helper'
+
+feature 'Edit group settings', feature: true do
+  given(:user)  { create(:user) }
+  given(:group) { create(:group, path: 'foo') }
+
+  background do
+    group.add_owner(user)
+    login_as(user)
+  end
+
+  describe 'when the group path is changed' do
+    let(:new_group_path) { 'bar' }
+    let(:old_group_full_path) { "/#{group.path}" }
+    let(:new_group_full_path) { "/#{new_group_path}" }
+
+    scenario 'the group is accessible via the new path' do
+      update_path(new_group_path)
+      visit new_group_full_path
+      expect(current_path).to eq(new_group_full_path)
+      expect(find('h1.group-title')).to have_content(new_group_path)
+    end
+
+    scenario 'the old group path redirects to the new path' do
+      update_path(new_group_path)
+      visit old_group_full_path
+      expect(current_path).to eq(new_group_full_path)
+      expect(find('h1.group-title')).to have_content(new_group_path)
+    end
+
+    context 'with a subgroup' do
+      given!(:subgroup) { create(:group, parent: group, path: 'subgroup') }
+      given(:old_subgroup_full_path) { "/#{group.path}/#{subgroup.path}" }
+      given(:new_subgroup_full_path) { "/#{new_group_path}/#{subgroup.path}" }
+
+      scenario 'the subgroup is accessible via the new path' do
+        update_path(new_group_path)
+        visit new_subgroup_full_path
+        expect(current_path).to eq(new_subgroup_full_path)
+        expect(find('h1.group-title')).to have_content(subgroup.path)
+      end
+
+      scenario 'the old subgroup path redirects to the new path' do
+        update_path(new_group_path)
+        visit old_subgroup_full_path
+        expect(current_path).to eq(new_subgroup_full_path)
+        expect(find('h1.group-title')).to have_content(subgroup.path)
+      end
+    end
+
+    context 'with a project' do
+      given!(:project) { create(:project, group: group, path: 'project') }
+      given(:old_project_full_path) { "/#{group.path}/#{project.path}" }
+      given(:new_project_full_path) { "/#{new_group_path}/#{project.path}" }
+      
+      before(:context) { TestEnv.clean_test_path }
+      after(:example) { TestEnv.clean_test_path }
+
+      scenario 'the project is accessible via the new path' do
+        update_path(new_group_path)
+        visit new_project_full_path
+        expect(current_path).to eq(new_project_full_path)
+        expect(find('h1.project-title')).to have_content(project.name)
+      end
+
+      scenario 'the old project path redirects to the new path' do
+        update_path(new_group_path)
+        visit old_project_full_path
+        expect(current_path).to eq(new_project_full_path)
+        expect(find('h1.project-title')).to have_content(project.name)
+      end
+    end
+  end
+end
+
+def update_path(new_group_path)
+  visit edit_group_path(group)
+  fill_in 'group_path', with: new_group_path
+  click_button 'Save group'
+end
diff --git a/spec/features/issues/award_emoji_spec.rb b/spec/features/issues/award_emoji_spec.rb
index 71df3c949db..853632614c4 100644
--- a/spec/features/issues/award_emoji_spec.rb
+++ b/spec/features/issues/award_emoji_spec.rb
@@ -7,7 +7,7 @@ describe 'Awards Emoji', feature: true do
   let!(:user)      { create(:user) }
   let(:issue) do
     create(:issue,
-           assignee: @user,
+           assignees: [user],
            project: project)
   end
 
diff --git a/spec/features/issues/award_spec.rb b/spec/features/issues/award_spec.rb
index 401e1ea2b89..08e3f99e29f 100644
--- a/spec/features/issues/award_spec.rb
+++ b/spec/features/issues/award_spec.rb
@@ -6,9 +6,12 @@ feature 'Issue awards', js: true, feature: true do
   let(:issue)     { create(:issue, project: project) }
 
   describe 'logged in' do
+    include WaitForVueResource
+
     before do
       login_as(user)
       visit namespace_project_issue_path(project.namespace, project, issue)
+      wait_for_vue_resource
     end
 
     it 'adds award to issue' do
@@ -38,8 +41,11 @@ feature 'Issue awards', js: true, feature: true do
   end
 
   describe 'logged out' do
+    include WaitForVueResource
+    
     before do
       visit namespace_project_issue_path(project.namespace, project, issue)
+      wait_for_vue_resource
     end
 
     it 'does not see award menu button' do
diff --git a/spec/features/issues/filtered_search/filter_issues_spec.rb b/spec/features/issues/filtered_search/filter_issues_spec.rb
index c824aa6a414..a8f4e2d7e10 100644
--- a/spec/features/issues/filtered_search/filter_issues_spec.rb
+++ b/spec/features/issues/filtered_search/filter_issues_spec.rb
@@ -51,15 +51,15 @@ describe 'Filter issues', js: true, feature: true do
     create(:issue, project: project, title: "issue with 'single quotes'")
     create(:issue, project: project, title: "issue with \"double quotes\"")
     create(:issue, project: project, title: "issue with !@\#{$%^&*()-+")
-    create(:issue, project: project, title: "issue by assignee", milestone: milestone, author: user, assignee: user)
-    create(:issue, project: project, title: "issue by assignee with searchTerm", milestone: milestone, author: user, assignee: user)
+    create(:issue, project: project, title: "issue by assignee", milestone: milestone, author: user, assignees: [user])
+    create(:issue, project: project, title: "issue by assignee with searchTerm", milestone: milestone, author: user, assignees: [user])
 
     issue = create(:issue,
       title: "Bug 2",
       project: project,
       milestone: milestone,
       author: user,
-      assignee: user)
+      assignees: [user])
     issue.labels << bug_label
 
     issue_with_caps_label = create(:issue,
@@ -67,7 +67,7 @@ describe 'Filter issues', js: true, feature: true do
       project: project,
       milestone: milestone,
       author: user,
-      assignee: user)
+      assignees: [user])
     issue_with_caps_label.labels << caps_sensitive_label
 
     issue_with_everything = create(:issue,
@@ -75,7 +75,7 @@ describe 'Filter issues', js: true, feature: true do
       project: project,
       milestone: milestone,
       author: user,
-      assignee: user)
+      assignees: [user])
     issue_with_everything.labels << bug_label
     issue_with_everything.labels << caps_sensitive_label
 
diff --git a/spec/features/issues/form_spec.rb b/spec/features/issues/form_spec.rb
index 21b8cf3add5..87adce3cddd 100644
--- a/spec/features/issues/form_spec.rb
+++ b/spec/features/issues/form_spec.rb
@@ -10,7 +10,7 @@ describe 'New/edit issue', feature: true, js: true do
   let!(:milestone) { create(:milestone, project: project) }
   let!(:label)     { create(:label, project: project) }
   let!(:label2)    { create(:label, project: project) }
-  let!(:issue)     { create(:issue, project: project, assignee: user, milestone: milestone) }
+  let!(:issue)     { create(:issue, project: project, assignees: [user], milestone: milestone) }
 
   before do
     project.team << [user, :master]
@@ -23,23 +23,62 @@ describe 'New/edit issue', feature: true, js: true do
       visit new_namespace_project_issue_path(project.namespace, project)
     end
 
+    describe 'multiple assignees' do
+      before do
+        click_button 'Unassigned'
+      end
+
+      it 'unselects other assignees when unassigned is selected' do
+        page.within '.dropdown-menu-user' do
+          click_link user2.name
+        end
+
+        page.within '.dropdown-menu-user' do
+          click_link 'Unassigned'
+        end
+
+        page.within '.js-assignee-search' do
+          expect(page).to have_content 'Unassigned'
+        end
+
+        expect(find('input[name="issue[assignee_ids][]"]', visible: false).value).to match('0')
+      end
+
+      it 'toggles assign to me when current user is selected and unselected' do
+        page.within '.dropdown-menu-user' do
+          click_link user.name
+        end
+
+        expect(find('a', text: 'Assign to me', visible: false)).not_to be_visible
+
+        page.within '.dropdown-menu-user' do
+          click_link user.name
+        end
+
+        expect(find('a', text: 'Assign to me')).to be_visible
+      end
+    end
+
     it 'allows user to create new issue' do
       fill_in 'issue_title', with: 'title'
       fill_in 'issue_description', with: 'title'
 
       expect(find('a', text: 'Assign to me')).to be_visible
-      click_button 'Assignee'
+      click_button 'Unassigned'
       page.within '.dropdown-menu-user' do
         click_link user2.name
       end
-      expect(find('input[name="issue[assignee_id]"]', visible: false).value).to match(user2.id.to_s)
+      expect(find('input[name="issue[assignee_ids][]"]', visible: false).value).to match(user2.id.to_s)
       page.within '.js-assignee-search' do
         expect(page).to have_content user2.name
       end
       expect(find('a', text: 'Assign to me')).to be_visible
 
       click_link 'Assign to me'
-      expect(find('input[name="issue[assignee_id]"]', visible: false).value).to match(user.id.to_s)
+      assignee_ids = page.all('input[name="issue[assignee_ids][]"]', visible: false)
+
+      expect(assignee_ids[0].value).to match(user.id.to_s)
+
       page.within '.js-assignee-search' do
         expect(page).to have_content user.name
       end
@@ -69,7 +108,7 @@ describe 'New/edit issue', feature: true, js: true do
 
       page.within '.issuable-sidebar' do
         page.within '.assignee' do
-          expect(page).to have_content user.name
+          expect(page).to have_content "Assignee"
         end
 
         page.within '.milestone' do
@@ -108,12 +147,12 @@ describe 'New/edit issue', feature: true, js: true do
     end
 
     it 'correctly updates the selected user when changing assignee' do
-      click_button 'Assignee'
+      click_button 'Unassigned'
       page.within '.dropdown-menu-user' do
         click_link user.name
       end
 
-      expect(find('input[name="issue[assignee_id]"]', visible: false).value).to match(user.id.to_s)
+      expect(find('input[name="issue[assignee_ids][]"]', visible: false).value).to match(user.id.to_s)
 
       click_button user.name
 
@@ -127,7 +166,7 @@ describe 'New/edit issue', feature: true, js: true do
         click_link user2.name
       end
 
-      expect(find('input[name="issue[assignee_id]"]', visible: false).value).to match(user2.id.to_s)
+      expect(find('input[name="issue[assignee_ids][]"]', visible: false).value).to match(user2.id.to_s)
 
       click_button user2.name
 
@@ -141,7 +180,7 @@ describe 'New/edit issue', feature: true, js: true do
     end
 
     it 'allows user to update issue' do
-      expect(find('input[name="issue[assignee_id]"]', visible: false).value).to match(user.id.to_s)
+      expect(find('input[name="issue[assignee_ids][]"]', visible: false).value).to match(user.id.to_s)
       expect(find('input[name="issue[milestone_id]"]', visible: false).value).to match(milestone.id.to_s)
       expect(find('a', text: 'Assign to me', visible: false)).not_to be_visible
 
diff --git a/spec/features/issues/issue_sidebar_spec.rb b/spec/features/issues/issue_sidebar_spec.rb
index 82b80a69bed..0de0f93089a 100644
--- a/spec/features/issues/issue_sidebar_spec.rb
+++ b/spec/features/issues/issue_sidebar_spec.rb
@@ -42,6 +42,21 @@ feature 'Issue Sidebar', feature: true do
         expect(page).to have_content(user2.name)
       end
     end
+
+    it 'assigns yourself' do
+      find('.block.assignee .dropdown-menu-toggle').click
+
+      click_button 'assign yourself'
+
+      wait_for_ajax
+
+      find('.block.assignee .edit-link').click
+
+      page.within '.dropdown-menu-user' do
+        expect(page.find('.dropdown-header')).to be_visible
+        expect(page.find('.dropdown-menu-user-link.is-active')).to have_content(user.name)
+      end
+    end
   end
 
   context 'as a allowed user' do
@@ -152,7 +167,7 @@ feature 'Issue Sidebar', feature: true do
   end
 
   def open_issue_sidebar
-    find('aside.right-sidebar.right-sidebar-collapsed .js-sidebar-toggle').click
+    find('aside.right-sidebar.right-sidebar-collapsed .js-sidebar-toggle').trigger('click')
     find('aside.right-sidebar.right-sidebar-expanded')
   end
 end
diff --git a/spec/features/issues/update_issues_spec.rb b/spec/features/issues/update_issues_spec.rb
index 7fa83c1fcf7..b250fa2ed3c 100644
--- a/spec/features/issues/update_issues_spec.rb
+++ b/spec/features/issues/update_issues_spec.rb
@@ -99,7 +99,7 @@ feature 'Multiple issue updating from issues#index', feature: true do
   end
 
   def create_assigned
-    create(:issue, project: project, assignee: user)
+    create(:issue, project: project, assignees: [user])
   end
 
   def create_with_milestone
diff --git a/spec/features/issues_spec.rb b/spec/features/issues_spec.rb
index 81cc8513454..5285dda361b 100644
--- a/spec/features/issues_spec.rb
+++ b/spec/features/issues_spec.rb
@@ -18,7 +18,7 @@ describe 'Issues', feature: true do
     let!(:issue) do
       create(:issue,
              author: @user,
-             assignee: @user,
+             assignees: [@user],
              project: project)
     end
 
@@ -43,7 +43,7 @@ describe 'Issues', feature: true do
     let!(:issue) do
       create(:issue,
              author: @user,
-             assignee: @user,
+             assignees: [@user],
              project: project)
     end
 
@@ -61,7 +61,7 @@ describe 'Issues', feature: true do
         expect(page).to have_content 'No assignee - assign yourself'
       end
 
-      expect(issue.reload.assignee).to be_nil
+      expect(issue.reload.assignees).to be_empty
     end
   end
 
@@ -138,7 +138,7 @@ describe 'Issues', feature: true do
 
   describe 'Issue info' do
     it 'excludes award_emoji from comment count' do
-      issue = create(:issue, author: @user, assignee: @user, project: project, title: 'foobar')
+      issue = create(:issue, author: @user, assignees: [@user], project: project, title: 'foobar')
       create(:award_emoji, awardable: issue)
 
       visit namespace_project_issues_path(project.namespace, project, assignee_id: @user.id)
@@ -153,14 +153,14 @@ describe 'Issues', feature: true do
       %w(foobar barbaz gitlab).each do |title|
         create(:issue,
                author: @user,
-               assignee: @user,
+               assignees: [@user],
                project: project,
                title: title)
       end
 
       @issue = Issue.find_by(title: 'foobar')
       @issue.milestone = create(:milestone, project: project)
-      @issue.assignee = nil
+      @issue.assignees = []
       @issue.save
     end
 
@@ -351,9 +351,9 @@ describe 'Issues', feature: true do
       let(:user2) { create(:user) }
 
       before do
-        foo.assignee = user2
+        foo.assignees << user2
         foo.save
-        bar.assignee = user2
+        bar.assignees << user2
         bar.save
       end
 
@@ -396,7 +396,7 @@ describe 'Issues', feature: true do
   end
 
   describe 'update labels from issue#show', js: true do
-    let(:issue) { create(:issue, project: project, author: @user, assignee: @user) }
+    let(:issue) { create(:issue, project: project, author: @user, assignees: [@user]) }
     let!(:label) { create(:label, project: project) }
 
     before do
@@ -415,7 +415,7 @@ describe 'Issues', feature: true do
   end
 
   describe 'update assignee from issue#show' do
-    let(:issue) { create(:issue, project: project, author: @user, assignee: @user) }
+    let(:issue) { create(:issue, project: project, author: @user, assignees: [@user]) }
 
     context 'by authorized user' do
       it 'allows user to select unassigned', js: true do
@@ -426,10 +426,14 @@ describe 'Issues', feature: true do
 
           click_link 'Edit'
           click_link 'Unassigned'
+          first('.title').click
           expect(page).to have_content 'No assignee'
         end
 
-        expect(issue.reload.assignee).to be_nil
+        # wait_for_ajax does not work with vue-resource at the moment
+        sleep 1
+
+        expect(issue.reload.assignees).to be_empty
       end
 
       it 'allows user to select an assignee', js: true do
@@ -461,14 +465,18 @@ describe 'Issues', feature: true do
           click_link 'Edit'
           click_link @user.name
 
-          page.within '.value' do
+          find('.dropdown-menu-toggle').click
+
+          page.within '.value .author' do
             expect(page).to have_content @user.name
           end
 
           click_link 'Edit'
           click_link @user.name
 
-          page.within '.value' do
+          find('.dropdown-menu-toggle').click
+
+          page.within '.value .assign-yourself' do
             expect(page).to have_content "No assignee"
           end
         end
@@ -487,7 +495,7 @@ describe 'Issues', feature: true do
         login_with guest
 
         visit namespace_project_issue_path(project.namespace, project, issue)
-        expect(page).to have_content issue.assignee.name
+        expect(page).to have_content issue.assignees.first.name
       end
     end
   end
@@ -558,7 +566,7 @@ describe 'Issues', feature: true do
       let(:user2) { create(:user) }
 
       before do
-        issue.assignee = user2
+        issue.assignees << user2
         issue.save
       end
     end
@@ -655,7 +663,7 @@ describe 'Issues', feature: true do
 
   describe 'due date' do
     context 'update due on issue#show', js: true do
-      let(:issue) { create(:issue, project: project, author: @user, assignee: @user) }
+      let(:issue) { create(:issue, project: project, author: @user, assignees: [@user]) }
 
       before do
         visit namespace_project_issue_path(project.namespace, project, issue)
@@ -702,7 +710,7 @@ describe 'Issues', feature: true do
     include WaitForVueResource
 
     it 'updates the title', js: true do
-      issue = create(:issue, author: @user, assignee: @user, project: project, title: 'new title')
+      issue = create(:issue, author: @user, assignees: [@user], project: project, title: 'new title')
 
       visit namespace_project_issue_path(project.namespace, project, issue)
 
diff --git a/spec/features/merge_requests/assign_issues_spec.rb b/spec/features/merge_requests/assign_issues_spec.rb
index 43cc6f2a2a7..ec49003772b 100644
--- a/spec/features/merge_requests/assign_issues_spec.rb
+++ b/spec/features/merge_requests/assign_issues_spec.rb
@@ -33,7 +33,7 @@ feature 'Merge request issue assignment', js: true, feature: true do
     end
 
     it "doesn't display if related issues are already assigned" do
-      [issue1, issue2].each { |issue| issue.update!(assignee: user) }
+      [issue1, issue2].each { |issue| issue.update!(assignees: [user]) }
 
       visit_merge_request
 
diff --git a/spec/features/milestones/show_spec.rb b/spec/features/milestones/show_spec.rb
index 40b4dc63697..227eb04ba72 100644
--- a/spec/features/milestones/show_spec.rb
+++ b/spec/features/milestones/show_spec.rb
@@ -5,7 +5,7 @@ describe 'Milestone show', feature: true do
   let(:project) { create(:empty_project) }
   let(:milestone) { create(:milestone, project: project) }
   let(:labels) { create_list(:label, 2, project: project) }
-  let(:issue_params) { { project: project, assignee: user, author: user, milestone: milestone, labels: labels } }
+  let(:issue_params) { { project: project, assignees: [user], author: user, milestone: milestone, labels: labels } }
 
   before do
     project.add_user(user, :developer) 
diff --git a/spec/features/profiles/account_spec.rb b/spec/features/profiles/account_spec.rb
new file mode 100644
index 00000000000..05a7587f8d4
--- /dev/null
+++ b/spec/features/profiles/account_spec.rb
@@ -0,0 +1,59 @@
+require 'rails_helper'
+
+feature 'Profile > Account', feature: true do
+  given(:user) { create(:user, username: 'foo') }
+
+  before do
+    login_as(user)
+  end
+
+  describe 'Change username' do
+    given(:new_username) { 'bar' }
+    given(:new_user_path) { "/#{new_username}" }
+    given(:old_user_path) { "/#{user.username}" }
+
+    scenario 'the user is accessible via the new path' do
+      update_username(new_username)
+      visit new_user_path
+      expect(current_path).to eq(new_user_path)
+      expect(find('.user-info')).to have_content(new_username)
+    end
+
+    scenario 'the old user path redirects to the new path' do
+      update_username(new_username)
+      visit old_user_path
+      expect(current_path).to eq(new_user_path)
+      expect(find('.user-info')).to have_content(new_username)
+    end
+
+    context 'with a project' do
+      given!(:project) { create(:project, namespace: user.namespace, path: 'project') }
+      given(:new_project_path) { "/#{new_username}/#{project.path}" }
+      given(:old_project_path) { "/#{user.username}/#{project.path}" }
+
+      before(:context) { TestEnv.clean_test_path }
+      after(:example) { TestEnv.clean_test_path }
+
+      scenario 'the project is accessible via the new path' do
+        update_username(new_username)
+        visit new_project_path
+        expect(current_path).to eq(new_project_path)
+        expect(find('h1.project-title')).to have_content(project.name)
+      end
+
+      scenario 'the old project path redirects to the new path' do
+        update_username(new_username)
+        visit old_project_path
+        expect(current_path).to eq(new_project_path)
+        expect(find('h1.project-title')).to have_content(project.name)
+      end
+    end
+  end
+end
+
+def update_username(new_username)
+  allow(user.namespace).to receive(:move_dir)
+  visit profile_account_path
+  fill_in 'user_username', with: new_username
+  click_button 'Update username'
+end
diff --git a/spec/features/projects/features_visibility_spec.rb b/spec/features/projects/features_visibility_spec.rb
index b080a8d500e..e1781cf320a 100644
--- a/spec/features/projects/features_visibility_spec.rb
+++ b/spec/features/projects/features_visibility_spec.rb
@@ -68,20 +68,23 @@ describe 'Edit Project Settings', feature: true do
   end
 
   describe 'project features visibility pages' do
-    before do
-      @tools =
-        {
-          builds: namespace_project_pipelines_path(project.namespace, project),
-          issues: namespace_project_issues_path(project.namespace, project),
-          wiki: namespace_project_wiki_path(project.namespace, project, :home),
-          snippets: namespace_project_snippets_path(project.namespace, project),
-          merge_requests: namespace_project_merge_requests_path(project.namespace, project),
-        }
+    let(:tools) do
+      {
+        builds: namespace_project_pipelines_path(project.namespace, project),
+        issues: namespace_project_issues_path(project.namespace, project),
+        wiki: namespace_project_wiki_path(project.namespace, project, :home),
+        snippets: namespace_project_snippets_path(project.namespace, project),
+        merge_requests: namespace_project_merge_requests_path(project.namespace, project),
+      }
     end
 
     context 'normal user' do
+      before do
+        login_as(member)
+      end
+
       it 'renders 200 if tool is enabled' do
-        @tools.each do |method_name, url|
+        tools.each do |method_name, url|
           project.project_feature.update_attribute("#{method_name}_access_level", ProjectFeature::ENABLED)
           visit url
           expect(page.status_code).to eq(200)
@@ -89,7 +92,7 @@ describe 'Edit Project Settings', feature: true do
       end
 
       it 'renders 404 if feature is disabled' do
-        @tools.each do |method_name, url|
+        tools.each do |method_name, url|
           project.project_feature.update_attribute("#{method_name}_access_level", ProjectFeature::DISABLED)
           visit url
           expect(page.status_code).to eq(404)
@@ -99,21 +102,21 @@ describe 'Edit Project Settings', feature: true do
       it 'renders 404 if feature is enabled only for team members' do
         project.team.truncate
 
-        @tools.each do |method_name, url|
+        tools.each do |method_name, url|
           project.project_feature.update_attribute("#{method_name}_access_level", ProjectFeature::PRIVATE)
           visit url
           expect(page.status_code).to eq(404)
         end
       end
 
-      it 'renders 200 if users is member of group' do
+      it 'renders 200 if user is member of group' do
         group = create(:group)
         project.group = group
         project.save
 
         group.add_owner(member)
 
-        @tools.each do |method_name, url|
+        tools.each do |method_name, url|
           project.project_feature.update_attribute("#{method_name}_access_level", ProjectFeature::PRIVATE)
           visit url
           expect(page.status_code).to eq(200)
@@ -128,7 +131,7 @@ describe 'Edit Project Settings', feature: true do
       end
 
       it 'renders 404 if feature is disabled' do
-        @tools.each do |method_name, url|
+        tools.each do |method_name, url|
           project.project_feature.update_attribute("#{method_name}_access_level", ProjectFeature::DISABLED)
           visit url
           expect(page.status_code).to eq(404)
@@ -138,7 +141,7 @@ describe 'Edit Project Settings', feature: true do
       it 'renders 200 if feature is enabled only for team members' do
         project.team.truncate
 
-        @tools.each do |method_name, url|
+        tools.each do |method_name, url|
           project.project_feature.update_attribute("#{method_name}_access_level", ProjectFeature::PRIVATE)
           visit url
           expect(page.status_code).to eq(200)
diff --git a/spec/features/projects/issuable_templates_spec.rb b/spec/features/projects/issuable_templates_spec.rb
index d28a853bbc2..fa5e30075e3 100644
--- a/spec/features/projects/issuable_templates_spec.rb
+++ b/spec/features/projects/issuable_templates_spec.rb
@@ -12,7 +12,7 @@ feature 'issuable templates', feature: true, js: true do
   context 'user creates an issue using templates' do
     let(:template_content) { 'this is a test "bug" template' }
     let(:longtemplate_content) { %Q(this\n\n\n\n\nis\n\n\n\n\na\n\n\n\n\nbug\n\n\n\n\ntemplate) }
-    let(:issue) { create(:issue, author: user, assignee: user, project: project) }
+    let(:issue) { create(:issue, author: user, assignees: [user], project: project) }
     let(:description_addition) { ' appending to description' }
 
     background do
@@ -72,7 +72,7 @@ feature 'issuable templates', feature: true, js: true do
   context 'user creates an issue using templates, with a prior description' do
     let(:prior_description) { 'test issue description' }
     let(:template_content) { 'this is a test "bug" template' }
-    let(:issue) { create(:issue, author: user, assignee: user, project: project) }
+    let(:issue) { create(:issue, author: user, assignees: [user], project: project) }
 
     background do
       project.repository.create_file(
diff --git a/spec/features/projects/pipelines/pipeline_spec.rb b/spec/features/projects/pipelines/pipeline_spec.rb
index 5a53e48f5f8..cfac54ef259 100644
--- a/spec/features/projects/pipelines/pipeline_spec.rb
+++ b/spec/features/projects/pipelines/pipeline_spec.rb
@@ -254,4 +254,57 @@ describe 'Pipeline', :feature, :js do
       it { expect(build_manual.reload).to be_pending }
     end
   end
+
+  describe 'GET /:project/pipelines/:id/failures' do
+    let(:project) { create(:project) }
+    let(:pipeline) { create(:ci_pipeline, project: project, ref: 'master', sha: project.commit.id) }
+    let(:pipeline_failures_page) { failures_namespace_project_pipeline_path(project.namespace, project, pipeline) }
+    let!(:failed_build) { create(:ci_build, :failed, pipeline: pipeline) }
+
+    context 'with failed build' do
+      before do
+        failed_build.trace.set('4 examples, 1 failure')
+
+        visit pipeline_failures_page
+      end
+
+      it 'shows jobs tab pane as active' do
+        expect(page).to have_content('Failed Jobs')
+        expect(page).to have_css('#js-tab-failures.active')
+      end
+
+      it 'lists failed builds' do
+        expect(page).to have_content(failed_build.name)
+        expect(page).to have_content(failed_build.stage)
+      end
+
+      it 'shows build failure logs' do
+        expect(page).to have_content('4 examples, 1 failure')
+      end
+    end
+
+    context 'when missing build logs' do
+      before do
+        visit pipeline_failures_page
+      end
+
+      it 'includes failed jobs' do
+        expect(page).to have_content('No job trace')
+      end
+    end
+
+    context 'without failures' do
+      before do
+        failed_build.update!(status: :success)
+
+        visit pipeline_failures_page
+      end
+
+      it 'displays the pipeline graph' do
+        expect(current_path).to eq(pipeline_path(pipeline))
+        expect(page).not_to have_content('Failed Jobs')
+        expect(page).to have_selector('.pipeline-visualization')
+      end
+    end
+  end
 end
diff --git a/spec/features/projects/project_settings_spec.rb b/spec/features/projects/project_settings_spec.rb
index 5d0314d5c09..11dcab4d737 100644
--- a/spec/features/projects/project_settings_spec.rb
+++ b/spec/features/projects/project_settings_spec.rb
@@ -1,64 +1,158 @@
 require 'spec_helper'
 
 describe 'Edit Project Settings', feature: true do
+  include Select2Helper
+
   let(:user) { create(:user) }
-  let(:project) { create(:empty_project, path: 'gitlab', name: 'sample') }
+  let(:project) { create(:empty_project, namespace: user.namespace, path: 'gitlab', name: 'sample') }
 
   before do
     login_as(user)
-    project.team << [user, :master]
   end
 
-  describe 'Project settings', js: true do
+  describe 'Project settings section', js: true do
     it 'shows errors for invalid project name' do
       visit edit_namespace_project_path(project.namespace, project)
-
       fill_in 'project_name_edit', with: 'foo&bar'
-
       click_button 'Save changes'
-
       expect(page).to have_field 'project_name_edit', with: 'foo&bar'
       expect(page).to have_content "Name can contain only letters, digits, emojis, '_', '.', dash, space. It must start with letter, digit, emoji or '_'."
       expect(page).to have_button 'Save changes'
     end
 
-    scenario 'shows a successful notice when the project is updated' do
+    it 'shows a successful notice when the project is updated' do
       visit edit_namespace_project_path(project.namespace, project)
-
       fill_in 'project_name_edit', with: 'hello world'
-
       click_button 'Save changes'
-
       expect(page).to have_content "Project 'hello world' was successfully updated."
     end
   end
 
-  describe 'Rename repository' do
-    it 'shows errors for invalid project path/name' do
-      visit edit_namespace_project_path(project.namespace, project)
-
-      fill_in 'project_name', with: 'foo&bar'
-      fill_in 'Path', with: 'foo&bar'
+  describe 'Rename repository section' do
+    context 'with invalid characters' do
+      it 'shows errors for invalid project path/name' do
+        rename_project(project, name: 'foo&bar', path: 'foo&bar')
+        expect(page).to have_field 'Project name', with: 'foo&bar'
+        expect(page).to have_field 'Path', with: 'foo&bar'
+        expect(page).to have_content "Name can contain only letters, digits, emojis, '_', '.', dash, space. It must start with letter, digit, emoji or '_'."
+        expect(page).to have_content "Path can contain only letters, digits, '_', '-' and '.'. Cannot start with '-', end in '.git' or end in '.atom'"
+      end
+    end
 
-      click_button 'Rename project'
+    context 'when changing project name' do
+      it 'renames the repository' do
+        rename_project(project, name: 'bar')
+        expect(find('h1.title')).to have_content(project.name)
+      end
+
+      context 'with emojis' do
+        it 'shows error for invalid project name' do
+          rename_project(project, name: '🚀 foo bar ☁️')
+          expect(page).to have_field 'Project name', with: '🚀 foo bar ☁️'
+          expect(page).not_to have_content "Name can contain only letters, digits, emojis '_', '.', dash and space. It must start with letter, digit, emoji or '_'."
+        end
+      end
+    end
 
-      expect(page).to have_field 'Project name', with: 'foo&bar'
-      expect(page).to have_field 'Path', with: 'foo&bar'
-      expect(page).to have_content "Name can contain only letters, digits, emojis, '_', '.', dash, space. It must start with letter, digit, emoji or '_'."
-      expect(page).to have_content "Path can contain only letters, digits, '_', '-' and '.'. Cannot start with '-', end in '.git' or end in '.atom'"
+    context 'when changing project path' do
+      # Not using empty project because we need a repo to exist
+      let(:project) { create(:project, namespace: user.namespace, name: 'gitlabhq') }
+
+      before(:context) { TestEnv.clean_test_path }
+      after(:example) { TestEnv.clean_test_path }
+
+      specify 'the project is accessible via the new path' do
+        rename_project(project, path: 'bar')
+        new_path = namespace_project_path(project.namespace, 'bar')
+        visit new_path
+        expect(current_path).to eq(new_path)
+        expect(find('h1.title')).to have_content(project.name)
+      end
+
+      specify 'the project is accessible via a redirect from the old path' do
+        old_path = namespace_project_path(project.namespace, project)
+        rename_project(project, path: 'bar')
+        new_path = namespace_project_path(project.namespace, 'bar')
+        visit old_path
+        expect(current_path).to eq(new_path)
+        expect(find('h1.title')).to have_content(project.name)
+      end
+
+      context 'and a new project is added with the same path' do
+        it 'overrides the redirect' do
+          old_path = namespace_project_path(project.namespace, project)
+          rename_project(project, path: 'bar')
+          new_project = create(:empty_project, namespace: user.namespace, path: 'gitlabhq', name: 'quz')
+          visit old_path
+          expect(current_path).to eq(old_path)
+          expect(find('h1.title')).to have_content(new_project.name)
+        end
+      end
     end
   end
 
-  describe 'Rename repository name with emojis' do
-    it 'shows error for invalid project name' do
-      visit edit_namespace_project_path(project.namespace, project)
-
-      fill_in 'project_name', with: '🚀 foo bar ☁️'
+  describe 'Transfer project section', js: true do
+    # Not using empty project because we need a repo to exist
+    let!(:project) { create(:project, namespace: user.namespace, name: 'gitlabhq') }
+    let!(:group) { create(:group) }
+
+    before(:context) { TestEnv.clean_test_path }
+    before(:example) { group.add_owner(user) }
+    after(:example) { TestEnv.clean_test_path }
+
+    specify 'the project is accessible via the new path' do
+      transfer_project(project, group)
+      new_path = namespace_project_path(group, project)
+      visit new_path
+      expect(current_path).to eq(new_path)
+      expect(find('h1.title')).to have_content(project.name)
+    end
 
-      click_button 'Rename project'
+    specify 'the project is accessible via a redirect from the old path' do
+      old_path = namespace_project_path(project.namespace, project)
+      transfer_project(project, group)
+      new_path = namespace_project_path(group, project)
+      visit old_path
+      expect(current_path).to eq(new_path)
+      expect(find('h1.title')).to have_content(project.name)
+    end
 
-      expect(page).to have_field 'Project name', with: '🚀 foo bar ☁️'
-      expect(page).not_to have_content "Name can contain only letters, digits, emojis '_', '.', dash and space. It must start with letter, digit, emoji or '_'."
+    context 'and a new project is added with the same path' do
+      it 'overrides the redirect' do
+        old_path = namespace_project_path(project.namespace, project)
+        transfer_project(project, group)
+        new_project = create(:empty_project, namespace: user.namespace, path: 'gitlabhq', name: 'quz')
+        visit old_path
+        expect(current_path).to eq(old_path)
+        expect(find('h1.title')).to have_content(new_project.name)
+      end
     end
   end
 end
+
+def rename_project(project, name: nil, path: nil)
+  visit edit_namespace_project_path(project.namespace, project)
+  fill_in('project_name', with: name) if name
+  fill_in('Path', with: path) if path
+  click_button('Rename project')
+  wait_for_edit_project_page_reload
+  project.reload
+end
+
+def transfer_project(project, namespace)
+  visit edit_namespace_project_path(project.namespace, project)
+  select2(namespace.id, from: '#new_namespace_id')
+  click_button('Transfer project')
+  confirm_transfer_modal
+  wait_for_edit_project_page_reload
+  project.reload
+end
+
+def confirm_transfer_modal
+  fill_in('confirm_name_input', with: project.path)
+  click_button 'Confirm'
+end
+
+def wait_for_edit_project_page_reload
+  expect(find('.project-edit-container')).to have_content('Rename repository')
+end
diff --git a/spec/features/raven_js_spec.rb b/spec/features/raven_js_spec.rb
new file mode 100644
index 00000000000..e8fa49c18cb
--- /dev/null
+++ b/spec/features/raven_js_spec.rb
@@ -0,0 +1,23 @@
+require 'spec_helper'
+
+feature 'RavenJS', :feature, :js do
+  let(:raven_path) { '/raven.bundle.js' }
+
+  it 'should not load raven if sentry is disabled' do
+    visit new_user_session_path
+
+    expect(has_requested_raven).to eq(false)
+  end
+
+  it 'should load raven if sentry is enabled' do
+    stub_application_setting(clientside_sentry_dsn: 'https://key@domain.com/id', clientside_sentry_enabled: true)
+
+    visit new_user_session_path
+
+    expect(has_requested_raven).to eq(true)
+  end
+
+  def has_requested_raven
+    page.driver.network_traffic.one? {|request| request.url.end_with?(raven_path)}
+  end
+end
diff --git a/spec/features/search_spec.rb b/spec/features/search_spec.rb
index da6388dcdf2..498a4a5cba0 100644
--- a/spec/features/search_spec.rb
+++ b/spec/features/search_spec.rb
@@ -5,7 +5,7 @@ describe "Search", feature: true  do
 
   let(:user) { create(:user) }
   let(:project) { create(:empty_project, namespace: user.namespace) }
-  let!(:issue) { create(:issue, project: project, assignee: user) }
+  let!(:issue) { create(:issue, project: project, assignees: [user]) }
   let!(:issue2) { create(:issue, project: project, author: user) }
 
   before do
diff --git a/spec/features/snippets/notes_on_personal_snippets_spec.rb b/spec/features/snippets/notes_on_personal_snippets_spec.rb
index c646039e0b1..957baac02eb 100644
--- a/spec/features/snippets/notes_on_personal_snippets_spec.rb
+++ b/spec/features/snippets/notes_on_personal_snippets_spec.rb
@@ -1,6 +1,6 @@
 require 'spec_helper'
 
-describe 'Comments on personal snippets', feature: true do
+describe 'Comments on personal snippets', :js, feature: true do
   let!(:user)    { create(:user) }
   let!(:snippet) { create(:personal_snippet, :public) }
   let!(:snippet_notes) do
@@ -18,7 +18,7 @@ describe 'Comments on personal snippets', feature: true do
 
   subject { page }
 
-  context 'viewing the snippet detail page' do
+  context 'when viewing the snippet detail page' do
     it 'contains notes for a snippet with correct action icons' do
       expect(page).to have_selector('#notes-list li', count: 2)
 
@@ -36,4 +36,64 @@ describe 'Comments on personal snippets', feature: true do
       end
     end
   end
+
+  context 'when submitting a note' do
+    it 'shows a valid form' do
+      is_expected.to have_css('.js-main-target-form', visible: true, count: 1)
+      expect(find('.js-main-target-form .js-comment-button').value).
+        to eq('Comment')
+
+      page.within('.js-main-target-form') do
+        expect(page).not_to have_link('Cancel')
+      end
+    end
+
+    it 'previews a note' do
+      fill_in 'note[note]', with: 'This is **awesome**!'
+      find('.js-md-preview-button').click
+
+      page.within('.new-note .md-preview') do
+        expect(page).to have_content('This is awesome!')
+        expect(page).to have_selector('strong')
+      end
+    end
+
+    it 'creates a note' do
+      fill_in 'note[note]', with: 'This is **awesome**!'
+      click_button 'Comment'
+
+      expect(find('div#notes')).to have_content('This is awesome!')
+    end
+  end
+
+  context 'when editing a note' do
+    it 'changes the text' do
+      page.within("#notes-list li#note_#{snippet_notes[0].id}") do
+        click_on 'Edit comment'
+      end
+
+      page.within('.current-note-edit-form') do
+        fill_in 'note[note]', with: 'new content'
+        find('.btn-save').click
+      end
+
+      page.within("#notes-list li#note_#{snippet_notes[0].id}") do
+        expect(page).to have_css('.note_edited_ago')
+        expect(page).to have_content('new content')
+        expect(find('.note_edited_ago').text).to match(/less than a minute ago/)
+      end
+    end
+  end
+
+  context 'when deleting a note' do
+    it 'removes the note from the snippet detail page' do
+      page.within("#notes-list li#note_#{snippet_notes[0].id}") do
+        click_on 'Remove comment'
+      end
+
+      wait_for_ajax
+
+      expect(page).not_to have_selector("#notes-list li#note_#{snippet_notes[0].id}")
+    end
+  end
 end
diff --git a/spec/features/task_lists_spec.rb b/spec/features/task_lists_spec.rb
index c33692fc4a9..8bd13caf2b0 100644
--- a/spec/features/task_lists_spec.rb
+++ b/spec/features/task_lists_spec.rb
@@ -62,12 +62,15 @@ feature 'Task Lists', feature: true do
     visit namespace_project_issue_path(project.namespace, project, issue)
   end
 
-  describe 'for Issues' do
-    describe 'multiple tasks' do
+  describe 'for Issues', feature: true do
+    describe 'multiple tasks', js: true do
+      include WaitForVueResource
+
       let!(:issue) { create(:issue, description: markdown, author: user, project: project) }
 
       it 'renders' do
         visit_issue(project, issue)
+        wait_for_vue_resource
 
         expect(page).to have_selector('ul.task-list',      count: 1)
         expect(page).to have_selector('li.task-list-item', count: 6)
@@ -76,25 +79,24 @@ feature 'Task Lists', feature: true do
 
       it 'contains the required selectors' do
         visit_issue(project, issue)
+        wait_for_vue_resource
 
-        container = '.detail-page-description .description.js-task-list-container'
-
-        expect(page).to have_selector(container)
-        expect(page).to have_selector("#{container} .wiki .task-list .task-list-item .task-list-item-checkbox")
-        expect(page).to have_selector("#{container} .js-task-list-field")
-        expect(page).to have_selector('form.js-issuable-update')
+        expect(page).to have_selector(".wiki .task-list .task-list-item .task-list-item-checkbox")
         expect(page).to have_selector('a.btn-close')
       end
 
       it 'is only editable by author' do
         visit_issue(project, issue)
-        expect(page).to have_selector('.js-task-list-container')
+        wait_for_vue_resource
 
-        logout(:user)
+        expect(page).to have_selector(".wiki .task-list .task-list-item .task-list-item-checkbox")
 
+        logout(:user)
         login_as(user2)
         visit current_path
-        expect(page).not_to have_selector('.js-task-list-container')
+        wait_for_vue_resource
+
+        expect(page).to have_selector(".wiki .task-list .task-list-item .task-list-item-checkbox")
       end
 
       it 'provides a summary on Issues#index' do
@@ -103,11 +105,14 @@ feature 'Task Lists', feature: true do
       end
     end
 
-    describe 'single incomplete task' do
+    describe 'single incomplete task', js: true do
+      include WaitForVueResource
+
       let!(:issue) { create(:issue, description: singleIncompleteMarkdown, author: user, project: project) }
 
       it 'renders' do
         visit_issue(project, issue)
+        wait_for_vue_resource
 
         expect(page).to have_selector('ul.task-list',      count: 1)
         expect(page).to have_selector('li.task-list-item', count: 1)
@@ -116,15 +121,18 @@ feature 'Task Lists', feature: true do
 
       it 'provides a summary on Issues#index' do
         visit namespace_project_issues_path(project.namespace, project)
+
         expect(page).to have_content("0 of 1 task completed")
       end
     end
 
-    describe 'single complete task' do
+    describe 'single complete task', js: true do
+      include WaitForVueResource
       let!(:issue) { create(:issue, description: singleCompleteMarkdown, author: user, project: project) }
 
       it 'renders' do
         visit_issue(project, issue)
+        wait_for_vue_resource
 
         expect(page).to have_selector('ul.task-list',      count: 1)
         expect(page).to have_selector('li.task-list-item', count: 1)
@@ -133,6 +141,7 @@ feature 'Task Lists', feature: true do
 
       it 'provides a summary on Issues#index' do
         visit namespace_project_issues_path(project.namespace, project)
+
         expect(page).to have_content("1 of 1 task completed")
       end
     end
diff --git a/spec/features/unsubscribe_links_spec.rb b/spec/features/unsubscribe_links_spec.rb
index e2d9cfdd0b0..a23c4ca2b92 100644
--- a/spec/features/unsubscribe_links_spec.rb
+++ b/spec/features/unsubscribe_links_spec.rb
@@ -6,7 +6,7 @@ describe 'Unsubscribe links', feature: true do
   let(:recipient) { create(:user) }
   let(:author) { create(:user) }
   let(:project) { create(:empty_project, :public) }
-  let(:params) { { title: 'A bug!', description: 'Fix it!', assignee: recipient } }
+  let(:params) { { title: 'A bug!', description: 'Fix it!', assignees: [recipient] } }
   let(:issue) { Issues::CreateService.new(project, author, params).execute }
 
   let(:mail) { ActionMailer::Base.deliveries.last }
diff --git a/spec/finders/issues_finder_spec.rb b/spec/finders/issues_finder_spec.rb
index a5f717e6233..96151689359 100644
--- a/spec/finders/issues_finder_spec.rb
+++ b/spec/finders/issues_finder_spec.rb
@@ -7,12 +7,12 @@ describe IssuesFinder do
   set(:project2) { create(:empty_project) }
   set(:milestone) { create(:milestone, project: project1) }
   set(:label) { create(:label, project: project2) }
-  set(:issue1) { create(:issue, author: user, assignee: user, project: project1, milestone: milestone, title: 'gitlab') }
-  set(:issue2) { create(:issue, author: user, assignee: user, project: project2, description: 'gitlab') }
-  set(:issue3) { create(:issue, author: user2, assignee: user2, project: project2, title: 'tanuki', description: 'tanuki') }
+  set(:issue1) { create(:issue, author: user, assignees: [user], project: project1, milestone: milestone, title: 'gitlab') }
+  set(:issue2) { create(:issue, author: user, assignees: [user], project: project2, description: 'gitlab') }
+  set(:issue3) { create(:issue, author: user2, assignees: [user2], project: project2, title: 'tanuki', description: 'tanuki') }
 
   describe '#execute' do
-    set(:closed_issue) { create(:issue, author: user2, assignee: user2, project: project2, state: 'closed') }
+    set(:closed_issue) { create(:issue, author: user2, assignees: [user2], project: project2, state: 'closed') }
     set(:label_link) { create(:label_link, label: label, target: issue2) }
     let(:search_user) { user }
     let(:params) { {} }
@@ -91,7 +91,7 @@ describe IssuesFinder do
 
         before do
           milestones.each do |milestone|
-            create(:issue, project: milestone.project, milestone: milestone, author: user, assignee: user)
+            create(:issue, project: milestone.project, milestone: milestone, author: user, assignees: [user])
           end
         end
 
@@ -126,7 +126,7 @@ describe IssuesFinder do
 
         before do
           milestones.each do |milestone|
-            create(:issue, project: milestone.project, milestone: milestone, author: user, assignee: user)
+            create(:issue, project: milestone.project, milestone: milestone, author: user, assignees: [user])
           end
         end
 
diff --git a/spec/fixtures/api/schemas/issue.json b/spec/fixtures/api/schemas/issue.json
index 21c078e0f44..ff86437fdd5 100644
--- a/spec/fixtures/api/schemas/issue.json
+++ b/spec/fixtures/api/schemas/issue.json
@@ -46,6 +46,24 @@
       "username": { "type": "string" },
       "avatar_url": { "type": "uri" }
     },
+    "assignees": {
+      "type": "array",
+      "items": {
+        "type": ["object", "null"],
+        "required": [
+          "id",
+          "name",
+          "username",
+          "avatar_url"
+        ],
+        "properties": {
+          "id": { "type": "integer" },
+          "name": { "type": "string" },
+          "username": { "type": "string" },
+          "avatar_url": { "type": "uri" }
+        }
+      }
+    },
     "subscribed": { "type": ["boolean", "null"] }
   },
   "additionalProperties": false
diff --git a/spec/fixtures/api/schemas/pipeline.json b/spec/fixtures/api/schemas/pipeline.json
new file mode 100644
index 00000000000..55511d17b5e
--- /dev/null
+++ b/spec/fixtures/api/schemas/pipeline.json
@@ -0,0 +1,354 @@
+{
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "definitions": {},
+    "id": "http://example.com/example.json",
+    "properties": {
+        "commit": {
+            "id": "/properties/commit",
+            "properties": {
+                "author": {
+                    "id": "/properties/commit/properties/author",
+                    "type": "null"
+                },
+                "author_email": {
+                    "id": "/properties/commit/properties/author_email",
+                    "type": "string"
+                },
+                "author_gravatar_url": {
+                    "id": "/properties/commit/properties/author_gravatar_url",
+                    "type": "string"
+                },
+                "author_name": {
+                    "id": "/properties/commit/properties/author_name",
+                    "type": "string"
+                },
+                "authored_date": {
+                    "id": "/properties/commit/properties/authored_date",
+                    "type": "string"
+                },
+                "commit_path": {
+                    "id": "/properties/commit/properties/commit_path",
+                    "type": "string"
+                },
+                "commit_url": {
+                    "id": "/properties/commit/properties/commit_url",
+                    "type": "string"
+                },
+                "committed_date": {
+                    "id": "/properties/commit/properties/committed_date",
+                    "type": "string"
+                },
+                "committer_email": {
+                    "id": "/properties/commit/properties/committer_email",
+                    "type": "string"
+                },
+                "committer_name": {
+                    "id": "/properties/commit/properties/committer_name",
+                    "type": "string"
+                },
+                "created_at": {
+                    "id": "/properties/commit/properties/created_at",
+                    "type": "string"
+                },
+                "id": {
+                    "id": "/properties/commit/properties/id",
+                    "type": "string"
+                },
+                "message": {
+                    "id": "/properties/commit/properties/message",
+                    "type": "string"
+                },
+                "parent_ids": {
+                    "id": "/properties/commit/properties/parent_ids",
+                    "items": {
+                        "id": "/properties/commit/properties/parent_ids/items",
+                        "type": "string"
+                    },
+                    "type": "array"
+                },
+                "short_id": {
+                    "id": "/properties/commit/properties/short_id",
+                    "type": "string"
+                },
+                "title": {
+                    "id": "/properties/commit/properties/title",
+                    "type": "string"
+                }
+            },
+            "type": "object"
+        },
+        "created_at": {
+            "id": "/properties/created_at",
+            "type": "string"
+        },
+        "details": {
+            "id": "/properties/details",
+            "properties": {
+                "artifacts": {
+                    "id": "/properties/details/properties/artifacts",
+                    "items": {},
+                    "type": "array"
+                },
+                "duration": {
+                    "id": "/properties/details/properties/duration",
+                    "type": "integer"
+                },
+                "finished_at": {
+                    "id": "/properties/details/properties/finished_at",
+                    "type": "string"
+                },
+                "manual_actions": {
+                    "id": "/properties/details/properties/manual_actions",
+                    "items": {},
+                    "type": "array"
+                },
+                "stages": {
+                    "id": "/properties/details/properties/stages",
+                    "items": {
+                        "id": "/properties/details/properties/stages/items",
+                        "properties": {
+                            "dropdown_path": {
+                                "id": "/properties/details/properties/stages/items/properties/dropdown_path",
+                                "type": "string"
+                            },
+                            "groups": {
+                                "id": "/properties/details/properties/stages/items/properties/groups",
+                                "items": {
+                                    "id": "/properties/details/properties/stages/items/properties/groups/items",
+                                    "properties": {
+                                        "name": {
+                                            "id": "/properties/details/properties/stages/items/properties/groups/items/properties/name",
+                                            "type": "string"
+                                        },
+                                        "size": {
+                                            "id": "/properties/details/properties/stages/items/properties/groups/items/properties/size",
+                                            "type": "integer"
+                                        },
+                                        "status": {
+                                            "id": "/properties/details/properties/stages/items/properties/groups/items/properties/status",
+                                            "properties": {
+                                                "details_path": {
+                                                    "id": "/properties/details/properties/stages/items/properties/groups/items/properties/status/properties/details_path",
+                                                    "type": "null"
+                                                },
+                                                "favicon": {
+                                                    "id": "/properties/details/properties/stages/items/properties/groups/items/properties/status/properties/favicon",
+                                                    "type": "string"
+                                                },
+                                                "group": {
+                                                    "id": "/properties/details/properties/stages/items/properties/groups/items/properties/status/properties/group",
+                                                    "type": "string"
+                                                },
+                                                "has_details": {
+                                                    "id": "/properties/details/properties/stages/items/properties/groups/items/properties/status/properties/has_details",
+                                                    "type": "boolean"
+                                                },
+                                                "icon": {
+                                                    "id": "/properties/details/properties/stages/items/properties/groups/items/properties/status/properties/icon",
+                                                    "type": "string"
+                                                },
+                                                "label": {
+                                                    "id": "/properties/details/properties/stages/items/properties/groups/items/properties/status/properties/label",
+                                                    "type": "string"
+                                                },
+                                                "text": {
+                                                    "id": "/properties/details/properties/stages/items/properties/groups/items/properties/status/properties/text",
+                                                    "type": "string"
+                                                }
+                                            },
+                                            "type": "object"
+                                        }
+                                    },
+                                    "type": "object"
+                                },
+                                "type": "array"
+                            },
+                            "name": {
+                                "id": "/properties/details/properties/stages/items/properties/name",
+                                "type": "string"
+                            },
+                            "path": {
+                                "id": "/properties/details/properties/stages/items/properties/path",
+                                "type": "string"
+                            },
+                            "status": {
+                                "id": "/properties/details/properties/stages/items/properties/status",
+                                "properties": {
+                                    "details_path": {
+                                        "id": "/properties/details/properties/stages/items/properties/status/properties/details_path",
+                                        "type": "string"
+                                    },
+                                    "favicon": {
+                                        "id": "/properties/details/properties/stages/items/properties/status/properties/favicon",
+                                        "type": "string"
+                                    },
+                                    "group": {
+                                        "id": "/properties/details/properties/stages/items/properties/status/properties/group",
+                                        "type": "string"
+                                    },
+                                    "has_details": {
+                                        "id": "/properties/details/properties/stages/items/properties/status/properties/has_details",
+                                        "type": "boolean"
+                                    },
+                                    "icon": {
+                                        "id": "/properties/details/properties/stages/items/properties/status/properties/icon",
+                                        "type": "string"
+                                    },
+                                    "label": {
+                                        "id": "/properties/details/properties/stages/items/properties/status/properties/label",
+                                        "type": "string"
+                                    },
+                                    "text": {
+                                        "id": "/properties/details/properties/stages/items/properties/status/properties/text",
+                                        "type": "string"
+                                    }
+                                },
+                                "type": "object"
+                            },
+                            "title": {
+                                "id": "/properties/details/properties/stages/items/properties/title",
+                                "type": "string"
+                            }
+                        },
+                        "type": "object"
+                    },
+                    "type": "array"
+                },
+                "status": {
+                    "id": "/properties/details/properties/status",
+                    "properties": {
+                        "details_path": {
+                            "id": "/properties/details/properties/status/properties/details_path",
+                            "type": "string"
+                        },
+                        "favicon": {
+                            "id": "/properties/details/properties/status/properties/favicon",
+                            "type": "string"
+                        },
+                        "group": {
+                            "id": "/properties/details/properties/status/properties/group",
+                            "type": "string"
+                        },
+                        "has_details": {
+                            "id": "/properties/details/properties/status/properties/has_details",
+                            "type": "boolean"
+                        },
+                        "icon": {
+                            "id": "/properties/details/properties/status/properties/icon",
+                            "type": "string"
+                        },
+                        "label": {
+                            "id": "/properties/details/properties/status/properties/label",
+                            "type": "string"
+                        },
+                        "text": {
+                            "id": "/properties/details/properties/status/properties/text",
+                            "type": "string"
+                        }
+                    },
+                    "type": "object"
+                }
+            },
+            "type": "object"
+        },
+        "flags": {
+            "id": "/properties/flags",
+            "properties": {
+                "cancelable": {
+                    "id": "/properties/flags/properties/cancelable",
+                    "type": "boolean"
+                },
+                "latest": {
+                    "id": "/properties/flags/properties/latest",
+                    "type": "boolean"
+                },
+                "retryable": {
+                    "id": "/properties/flags/properties/retryable",
+                    "type": "boolean"
+                },
+                "stuck": {
+                    "id": "/properties/flags/properties/stuck",
+                    "type": "boolean"
+                },
+                "triggered": {
+                    "id": "/properties/flags/properties/triggered",
+                    "type": "boolean"
+                },
+                "yaml_errors": {
+                    "id": "/properties/flags/properties/yaml_errors",
+                    "type": "boolean"
+                }
+            },
+            "type": "object"
+        },
+        "id": {
+            "id": "/properties/id",
+            "type": "integer"
+        },
+        "path": {
+            "id": "/properties/path",
+            "type": "string"
+        },
+        "ref": {
+            "id": "/properties/ref",
+            "properties": {
+                "branch": {
+                    "id": "/properties/ref/properties/branch",
+                    "type": "boolean"
+                },
+                "name": {
+                    "id": "/properties/ref/properties/name",
+                    "type": "string"
+                },
+                "path": {
+                    "id": "/properties/ref/properties/path",
+                    "type": "string"
+                },
+                "tag": {
+                    "id": "/properties/ref/properties/tag",
+                    "type": "boolean"
+                }
+            },
+            "type": "object"
+        },
+        "retry_path": {
+            "id": "/properties/retry_path",
+            "type": "string"
+        },
+        "updated_at": {
+            "id": "/properties/updated_at",
+            "type": "string"
+        },
+        "user": {
+            "id": "/properties/user",
+            "properties": {
+                "avatar_url": {
+                    "id": "/properties/user/properties/avatar_url",
+                    "type": "string"
+                },
+                "id": {
+                    "id": "/properties/user/properties/id",
+                    "type": "integer"
+                },
+                "name": {
+                    "id": "/properties/user/properties/name",
+                    "type": "string"
+                },
+                "state": {
+                    "id": "/properties/user/properties/state",
+                    "type": "string"
+                },
+                "username": {
+                    "id": "/properties/user/properties/username",
+                    "type": "string"
+                },
+                "web_url": {
+                    "id": "/properties/user/properties/web_url",
+                    "type": "string"
+                }
+            },
+            "type": "object"
+        }
+    },
+    "type": "object"
+}
diff --git a/spec/fixtures/api/schemas/public_api/v4/issues.json b/spec/fixtures/api/schemas/public_api/v4/issues.json
index 52199e75734..2d1c84ee93d 100644
--- a/spec/fixtures/api/schemas/public_api/v4/issues.json
+++ b/spec/fixtures/api/schemas/public_api/v4/issues.json
@@ -33,6 +33,21 @@
         },
         "additionalProperties": false
       },
+      "assignees": {
+        "type": "array",
+        "items": {
+          "type": ["object", "null"],
+          "properties": {
+            "name": { "type": "string" },
+            "username": { "type": "string" },
+            "id": { "type": "integer" },
+            "state": { "type": "string" },
+            "avatar_url": { "type": "uri" },
+            "web_url": { "type": "uri" }
+          },
+          "additionalProperties": false
+        }
+      },
       "assignee": {
         "type": ["object", "null"],
         "properties": {
@@ -67,7 +82,7 @@
     "required": [
       "id", "iid", "project_id", "title", "description",
       "state", "created_at", "updated_at", "labels",
-      "milestone", "assignee", "author", "user_notes_count",
+      "milestone", "assignees", "author", "user_notes_count",
       "upvotes", "downvotes", "due_date", "confidential",
       "web_url"
     ],
diff --git a/spec/helpers/issuables_helper_spec.rb b/spec/helpers/issuables_helper_spec.rb
index 93bb711f29a..c1ecb46aece 100644
--- a/spec/helpers/issuables_helper_spec.rb
+++ b/spec/helpers/issuables_helper_spec.rb
@@ -4,6 +4,23 @@ describe IssuablesHelper do
   let(:label)  { build_stubbed(:label) }
   let(:label2) { build_stubbed(:label) }
 
+  describe '#users_dropdown_label' do
+    let(:user)  { build_stubbed(:user) }
+    let(:user2)  { build_stubbed(:user) }
+
+    it 'returns unassigned' do
+      expect(users_dropdown_label([])).to eq('Unassigned')
+    end
+
+    it 'returns selected user\'s name' do
+      expect(users_dropdown_label([user])).to eq(user.name)
+    end
+
+    it 'returns selected user\'s name and counter' do
+      expect(users_dropdown_label([user, user2])).to eq("#{user.name} + 1 more")
+    end
+  end
+
   describe '#issuable_labels_tooltip' do
     it 'returns label text' do
       expect(issuable_labels_tooltip([label])).to eq(label.title)
diff --git a/spec/helpers/notes_helper_spec.rb b/spec/helpers/notes_helper_spec.rb
index 6c990f94175..099146678ae 100644
--- a/spec/helpers/notes_helper_spec.rb
+++ b/spec/helpers/notes_helper_spec.rb
@@ -175,4 +175,79 @@ describe NotesHelper do
       end
     end
   end
+
+  describe '#notes_url' do
+    it 'return snippet notes path for personal snippet' do
+      @snippet = create(:personal_snippet)
+
+      expect(helper.notes_url).to eq("/snippets/#{@snippet.id}/notes")
+    end
+
+    it 'return project notes path for project snippet' do
+      namespace = create(:namespace, path: 'nm')
+      @project = create(:empty_project, path: 'test', namespace: namespace)
+      @snippet = create(:project_snippet, project: @project)
+      @noteable = @snippet
+
+      expect(helper.notes_url).to eq("/nm/test/noteable/project_snippet/#{@noteable.id}/notes")
+    end
+
+    it 'return project notes path for other noteables' do
+      namespace = create(:namespace, path: 'nm')
+      @project = create(:empty_project, path: 'test', namespace: namespace)
+      @noteable = create(:issue, project: @project)
+
+      expect(helper.notes_url).to eq("/nm/test/noteable/issue/#{@noteable.id}/notes")
+    end
+  end
+
+  describe '#note_url' do
+    it 'return snippet notes path for personal snippet' do
+      note = create(:note_on_personal_snippet)
+
+      expect(helper.note_url(note)).to eq("/snippets/#{note.noteable.id}/notes/#{note.id}")
+    end
+
+    it 'return project notes path for project snippet' do
+      namespace = create(:namespace, path: 'nm')
+      @project = create(:empty_project, path: 'test', namespace: namespace)
+      note = create(:note_on_project_snippet, project: @project)
+
+      expect(helper.note_url(note)).to eq("/nm/test/notes/#{note.id}")
+    end
+
+    it 'return project notes path for other noteables' do
+      namespace = create(:namespace, path: 'nm')
+      @project = create(:empty_project, path: 'test', namespace: namespace)
+      note = create(:note_on_issue, project: @project)
+
+      expect(helper.note_url(note)).to eq("/nm/test/notes/#{note.id}")
+    end
+  end
+
+  describe '#form_resurces' do
+    it 'returns note for personal snippet' do
+      @snippet = create(:personal_snippet)
+      @note = create(:note_on_personal_snippet)
+
+      expect(helper.form_resources).to eq([@note])
+    end
+
+    it 'returns namespace, project and note for project snippet' do
+      namespace = create(:namespace, path: 'nm')
+      @project = create(:empty_project, path: 'test', namespace: namespace)
+      @snippet = create(:project_snippet, project: @project)
+      @note = create(:note_on_personal_snippet)
+
+      expect(helper.form_resources).to eq([@project.namespace, @project, @note])
+    end
+
+    it 'returns namespace, project and note path for other noteables' do
+      namespace = create(:namespace, path: 'nm')
+      @project = create(:empty_project, path: 'test', namespace: namespace)
+      @note = create(:note_on_issue, project: @project)
+
+      expect(helper.form_resources).to eq([@project.namespace, @project, @note])
+    end
+  end
 end
diff --git a/spec/javascripts/autosave_spec.js b/spec/javascripts/autosave_spec.js
new file mode 100644
index 00000000000..9f9acc392c2
--- /dev/null
+++ b/spec/javascripts/autosave_spec.js
@@ -0,0 +1,134 @@
+import Autosave from '~/autosave';
+import AccessorUtilities from '~/lib/utils/accessor';
+
+describe('Autosave', () => {
+  let autosave;
+
+  describe('class constructor', () => {
+    const key = 'key';
+    const field = jasmine.createSpyObj('field', ['data', 'on']);
+
+    beforeEach(() => {
+      spyOn(AccessorUtilities, 'isLocalStorageAccessSafe').and.returnValue(true);
+      spyOn(Autosave.prototype, 'restore');
+
+      autosave = new Autosave(field, key);
+    });
+
+    it('should set .isLocalStorageAvailable', () => {
+      expect(AccessorUtilities.isLocalStorageAccessSafe).toHaveBeenCalled();
+      expect(autosave.isLocalStorageAvailable).toBe(true);
+    });
+  });
+
+  describe('restore', () => {
+    const key = 'key';
+    const field = jasmine.createSpyObj('field', ['trigger']);
+
+    beforeEach(() => {
+      autosave = {
+        field,
+        key,
+      };
+
+      spyOn(window.localStorage, 'getItem');
+    });
+
+    describe('if .isLocalStorageAvailable is `false`', () => {
+      beforeEach(() => {
+        autosave.isLocalStorageAvailable = false;
+
+        Autosave.prototype.restore.call(autosave);
+      });
+
+      it('should not call .getItem', () => {
+        expect(window.localStorage.getItem).not.toHaveBeenCalled();
+      });
+    });
+
+    describe('if .isLocalStorageAvailable is `true`', () => {
+      beforeEach(() => {
+        autosave.isLocalStorageAvailable = true;
+
+        Autosave.prototype.restore.call(autosave);
+      });
+
+      it('should call .getItem', () => {
+        expect(window.localStorage.getItem).toHaveBeenCalledWith(key);
+      });
+    });
+  });
+
+  describe('save', () => {
+    const field = jasmine.createSpyObj('field', ['val']);
+
+    beforeEach(() => {
+      autosave = jasmine.createSpyObj('autosave', ['reset']);
+      autosave.field = field;
+
+      field.val.and.returnValue('value');
+
+      spyOn(window.localStorage, 'setItem');
+    });
+
+    describe('if .isLocalStorageAvailable is `false`', () => {
+      beforeEach(() => {
+        autosave.isLocalStorageAvailable = false;
+
+        Autosave.prototype.save.call(autosave);
+      });
+
+      it('should not call .setItem', () => {
+        expect(window.localStorage.setItem).not.toHaveBeenCalled();
+      });
+    });
+
+    describe('if .isLocalStorageAvailable is `true`', () => {
+      beforeEach(() => {
+        autosave.isLocalStorageAvailable = true;
+
+        Autosave.prototype.save.call(autosave);
+      });
+
+      it('should call .setItem', () => {
+        expect(window.localStorage.setItem).toHaveBeenCalled();
+      });
+    });
+  });
+
+  describe('reset', () => {
+    const key = 'key';
+
+    beforeEach(() => {
+      autosave = {
+        key,
+      };
+
+      spyOn(window.localStorage, 'removeItem');
+    });
+
+    describe('if .isLocalStorageAvailable is `false`', () => {
+      beforeEach(() => {
+        autosave.isLocalStorageAvailable = false;
+
+        Autosave.prototype.reset.call(autosave);
+      });
+
+      it('should not call .removeItem', () => {
+        expect(window.localStorage.removeItem).not.toHaveBeenCalled();
+      });
+    });
+
+    describe('if .isLocalStorageAvailable is `true`', () => {
+      beforeEach(() => {
+        autosave.isLocalStorageAvailable = true;
+
+        Autosave.prototype.reset.call(autosave);
+      });
+
+      it('should call .removeItem', () => {
+        expect(window.localStorage.removeItem).toHaveBeenCalledWith(key);
+      });
+    });
+  });
+});
diff --git a/spec/javascripts/behaviors/gl_emoji/unicode_support_map_spec.js b/spec/javascripts/behaviors/gl_emoji/unicode_support_map_spec.js
new file mode 100644
index 00000000000..1ed96a67478
--- /dev/null
+++ b/spec/javascripts/behaviors/gl_emoji/unicode_support_map_spec.js
@@ -0,0 +1,47 @@
+import { getUnicodeSupportMap } from '~/behaviors/gl_emoji/unicode_support_map';
+import AccessorUtilities from '~/lib/utils/accessor';
+
+describe('Unicode Support Map', () => {
+  describe('getUnicodeSupportMap', () => {
+    const stringSupportMap = 'stringSupportMap';
+
+    beforeEach(() => {
+      spyOn(AccessorUtilities, 'isLocalStorageAccessSafe');
+      spyOn(window.localStorage, 'getItem');
+      spyOn(window.localStorage, 'setItem');
+      spyOn(JSON, 'parse');
+      spyOn(JSON, 'stringify').and.returnValue(stringSupportMap);
+    });
+
+    describe('if isLocalStorageAvailable is `true`', function () {
+      beforeEach(() => {
+        AccessorUtilities.isLocalStorageAccessSafe.and.returnValue(true);
+
+        getUnicodeSupportMap();
+      });
+
+      it('should call .getItem and .setItem', () => {
+        const allArgs = window.localStorage.setItem.calls.allArgs();
+
+        expect(window.localStorage.getItem).toHaveBeenCalledWith('gl-emoji-user-agent');
+        expect(allArgs[0][0]).toBe('gl-emoji-user-agent');
+        expect(allArgs[0][1]).toBe(navigator.userAgent);
+        expect(allArgs[1][0]).toBe('gl-emoji-unicode-support-map');
+        expect(allArgs[1][1]).toBe(stringSupportMap);
+      });
+    });
+
+    describe('if isLocalStorageAvailable is `false`', function () {
+      beforeEach(() => {
+        AccessorUtilities.isLocalStorageAccessSafe.and.returnValue(false);
+
+        getUnicodeSupportMap();
+      });
+
+      it('should not call .getItem or .setItem', () => {
+        expect(window.localStorage.getItem.calls.count()).toBe(1);
+        expect(window.localStorage.setItem).not.toHaveBeenCalled();
+      });
+    });
+  });
+});
diff --git a/spec/javascripts/blob/balsamiq/balsamiq_viewer_spec.js b/spec/javascripts/blob/balsamiq/balsamiq_viewer_spec.js
new file mode 100644
index 00000000000..85816ee1f11
--- /dev/null
+++ b/spec/javascripts/blob/balsamiq/balsamiq_viewer_spec.js
@@ -0,0 +1,342 @@
+import sqljs from 'sql.js';
+import BalsamiqViewer from '~/blob/balsamiq/balsamiq_viewer';
+import ClassSpecHelper from '../../helpers/class_spec_helper';
+
+describe('BalsamiqViewer', () => {
+  let balsamiqViewer;
+  let endpoint;
+  let viewer;
+
+  describe('class constructor', () => {
+    beforeEach(() => {
+      endpoint = 'endpoint';
+      viewer = {
+        dataset: {
+          endpoint,
+        },
+      };
+
+      balsamiqViewer = new BalsamiqViewer(viewer);
+    });
+
+    it('should set .viewer', () => {
+      expect(balsamiqViewer.viewer).toBe(viewer);
+    });
+
+    it('should set .endpoint', () => {
+      expect(balsamiqViewer.endpoint).toBe(endpoint);
+    });
+  });
+
+  describe('loadFile', () => {
+    let xhr;
+
+    beforeEach(() => {
+      endpoint = 'endpoint';
+      xhr = jasmine.createSpyObj('xhr', ['open', 'send']);
+
+      balsamiqViewer = jasmine.createSpyObj('balsamiqViewer', ['renderFile']);
+      balsamiqViewer.endpoint = endpoint;
+
+      spyOn(window, 'XMLHttpRequest').and.returnValue(xhr);
+
+      BalsamiqViewer.prototype.loadFile.call(balsamiqViewer);
+    });
+
+    it('should call .open', () => {
+      expect(xhr.open).toHaveBeenCalledWith('GET', endpoint, true);
+    });
+
+    it('should set .responseType', () => {
+      expect(xhr.responseType).toBe('arraybuffer');
+    });
+
+    it('should call .send', () => {
+      expect(xhr.send).toHaveBeenCalled();
+    });
+  });
+
+  describe('renderFile', () => {
+    let container;
+    let loadEvent;
+    let previews;
+
+    beforeEach(() => {
+      loadEvent = { target: { response: {} } };
+      viewer = jasmine.createSpyObj('viewer', ['appendChild']);
+      previews = [document.createElement('ul'), document.createElement('ul')];
+
+      balsamiqViewer = jasmine.createSpyObj('balsamiqViewer', ['initDatabase', 'getPreviews', 'renderPreview']);
+      balsamiqViewer.viewer = viewer;
+
+      balsamiqViewer.getPreviews.and.returnValue(previews);
+      balsamiqViewer.renderPreview.and.callFake(preview => preview);
+      viewer.appendChild.and.callFake((containerElement) => {
+        container = containerElement;
+      });
+
+      BalsamiqViewer.prototype.renderFile.call(balsamiqViewer, loadEvent);
+    });
+
+    it('should call .initDatabase', () => {
+      expect(balsamiqViewer.initDatabase).toHaveBeenCalledWith(loadEvent.target.response);
+    });
+
+    it('should call .getPreviews', () => {
+      expect(balsamiqViewer.getPreviews).toHaveBeenCalled();
+    });
+
+    it('should call .renderPreview for each preview', () => {
+      const allArgs = balsamiqViewer.renderPreview.calls.allArgs();
+
+      expect(allArgs.length).toBe(2);
+
+      previews.forEach((preview, i) => {
+        expect(allArgs[i][0]).toBe(preview);
+      });
+    });
+
+    it('should set the container HTML', () => {
+      expect(container.innerHTML).toBe('<ul></ul><ul></ul>');
+    });
+
+    it('should add inline preview classes', () => {
+      expect(container.classList[0]).toBe('list-inline');
+      expect(container.classList[1]).toBe('previews');
+    });
+
+    it('should call viewer.appendChild', () => {
+      expect(viewer.appendChild).toHaveBeenCalledWith(container);
+    });
+  });
+
+  describe('initDatabase', () => {
+    let database;
+    let uint8Array;
+    let data;
+
+    beforeEach(() => {
+      uint8Array = {};
+      database = {};
+      data = 'data';
+
+      balsamiqViewer = {};
+
+      spyOn(window, 'Uint8Array').and.returnValue(uint8Array);
+      spyOn(sqljs, 'Database').and.returnValue(database);
+
+      BalsamiqViewer.prototype.initDatabase.call(balsamiqViewer, data);
+    });
+
+    it('should instantiate Uint8Array', () => {
+      expect(window.Uint8Array).toHaveBeenCalledWith(data);
+    });
+
+    it('should call sqljs.Database', () => {
+      expect(sqljs.Database).toHaveBeenCalledWith(uint8Array);
+    });
+
+    it('should set .database', () => {
+      expect(balsamiqViewer.database).toBe(database);
+    });
+  });
+
+  describe('getPreviews', () => {
+    let database;
+    let thumbnails;
+    let getPreviews;
+
+    beforeEach(() => {
+      database = jasmine.createSpyObj('database', ['exec']);
+      thumbnails = [{ values: [0, 1, 2] }];
+
+      balsamiqViewer = {
+        database,
+      };
+
+      spyOn(BalsamiqViewer, 'parsePreview').and.callFake(preview => preview.toString());
+      database.exec.and.returnValue(thumbnails);
+
+      getPreviews = BalsamiqViewer.prototype.getPreviews.call(balsamiqViewer);
+    });
+
+    it('should call database.exec', () => {
+      expect(database.exec).toHaveBeenCalledWith('SELECT * FROM thumbnails');
+    });
+
+    it('should call .parsePreview for each value', () => {
+      const allArgs = BalsamiqViewer.parsePreview.calls.allArgs();
+
+      expect(allArgs.length).toBe(3);
+
+      thumbnails[0].values.forEach((value, i) => {
+        expect(allArgs[i][0]).toBe(value);
+      });
+    });
+
+    it('should return an array of parsed values', () => {
+      expect(getPreviews).toEqual(['0', '1', '2']);
+    });
+  });
+
+  describe('getResource', () => {
+    let database;
+    let resourceID;
+    let resource;
+    let getResource;
+
+    beforeEach(() => {
+      database = jasmine.createSpyObj('database', ['exec']);
+      resourceID = 4;
+      resource = ['resource'];
+
+      balsamiqViewer = {
+        database,
+      };
+
+      database.exec.and.returnValue(resource);
+
+      getResource = BalsamiqViewer.prototype.getResource.call(balsamiqViewer, resourceID);
+    });
+
+    it('should call database.exec', () => {
+      expect(database.exec).toHaveBeenCalledWith(`SELECT * FROM resources WHERE id = '${resourceID}'`);
+    });
+
+    it('should return the selected resource', () => {
+      expect(getResource).toBe(resource[0]);
+    });
+  });
+
+  describe('renderPreview', () => {
+    let previewElement;
+    let innerHTML;
+    let preview;
+    let renderPreview;
+
+    beforeEach(() => {
+      innerHTML = '<a>innerHTML</a>';
+      previewElement = {
+        outerHTML: '<p>outerHTML</p>',
+        classList: jasmine.createSpyObj('classList', ['add']),
+      };
+      preview = {};
+
+      balsamiqViewer = jasmine.createSpyObj('balsamiqViewer', ['renderTemplate']);
+
+      spyOn(document, 'createElement').and.returnValue(previewElement);
+      balsamiqViewer.renderTemplate.and.returnValue(innerHTML);
+
+      renderPreview = BalsamiqViewer.prototype.renderPreview.call(balsamiqViewer, preview);
+    });
+
+    it('should call classList.add', () => {
+      expect(previewElement.classList.add).toHaveBeenCalledWith('preview');
+    });
+
+    it('should call .renderTemplate', () => {
+      expect(balsamiqViewer.renderTemplate).toHaveBeenCalledWith(preview);
+    });
+
+    it('should set .innerHTML', () => {
+      expect(previewElement.innerHTML).toBe(innerHTML);
+    });
+
+    it('should return element', () => {
+      expect(renderPreview).toBe(previewElement);
+    });
+  });
+
+  describe('renderTemplate', () => {
+    let preview;
+    let name;
+    let resource;
+    let template;
+    let renderTemplate;
+
+    beforeEach(() => {
+      preview = { resourceID: 1, image: 'image' };
+      name = 'name';
+      resource = 'resource';
+      template = `
+        <div class="panel panel-default">
+          <div class="panel-heading">name</div>
+          <div class="panel-body">
+            <img class="img-thumbnail" src="data:image/png;base64,image"/>
+          </div>
+        </div>
+      `;
+
+      balsamiqViewer = jasmine.createSpyObj('balsamiqViewer', ['getResource']);
+
+      spyOn(BalsamiqViewer, 'parseTitle').and.returnValue(name);
+      balsamiqViewer.getResource.and.returnValue(resource);
+
+      renderTemplate = BalsamiqViewer.prototype.renderTemplate.call(balsamiqViewer, preview);
+    });
+
+    it('should call .getResource', () => {
+      expect(balsamiqViewer.getResource).toHaveBeenCalledWith(preview.resourceID);
+    });
+
+    it('should call .parseTitle', () => {
+      expect(BalsamiqViewer.parseTitle).toHaveBeenCalledWith(resource);
+    });
+
+    it('should return the template string', function () {
+      expect(renderTemplate.replace(/\s/g, '')).toEqual(template.replace(/\s/g, ''));
+    });
+  });
+
+  describe('parsePreview', () => {
+    let preview;
+    let parsePreview;
+
+    beforeEach(() => {
+      preview = ['{}', '{ "id": 1 }'];
+
+      spyOn(JSON, 'parse').and.callThrough();
+
+      parsePreview = BalsamiqViewer.parsePreview(preview);
+    });
+
+    ClassSpecHelper.itShouldBeAStaticMethod(BalsamiqViewer, 'parsePreview');
+
+    it('should return the parsed JSON', () => {
+      expect(parsePreview).toEqual(JSON.parse('{ "id": 1 }'));
+    });
+  });
+
+  describe('parseTitle', () => {
+    let title;
+    let parseTitle;
+
+    beforeEach(() => {
+      title = { values: [['{}', '{}', '{"name":"name"}']] };
+
+      spyOn(JSON, 'parse').and.callThrough();
+
+      parseTitle = BalsamiqViewer.parseTitle(title);
+    });
+
+    ClassSpecHelper.itShouldBeAStaticMethod(BalsamiqViewer, 'parsePreview');
+
+    it('should return the name value', () => {
+      expect(parseTitle).toBe('name');
+    });
+  });
+
+  describe('onError', () => {
+    beforeEach(() => {
+      spyOn(window, 'Flash');
+
+      BalsamiqViewer.onError();
+    });
+
+    ClassSpecHelper.itShouldBeAStaticMethod(BalsamiqViewer, 'onError');
+
+    it('should instantiate Flash', () => {
+      expect(window.Flash).toHaveBeenCalledWith('Balsamiq file could not be loaded.');
+    });
+  });
+});
diff --git a/spec/javascripts/boards/board_card_spec.js b/spec/javascripts/boards/board_card_spec.js
index de072e7e470..376e706d1db 100644
--- a/spec/javascripts/boards/board_card_spec.js
+++ b/spec/javascripts/boards/board_card_spec.js
@@ -1,12 +1,12 @@
 /* global List */
-/* global ListUser */
+/* global ListAssignee */
 /* global ListLabel */
 /* global listObj */
 /* global boardsMockInterceptor */
 /* global BoardService */
 
 import Vue from 'vue';
-import '~/boards/models/user';
+import '~/boards/models/assignee';
 
 require('~/boards/models/list');
 require('~/boards/models/label');
@@ -133,12 +133,12 @@ describe('Issue card', () => {
     });
 
     it('does not set detail issue if img is clicked', (done) => {
-      vm.issue.assignee = new ListUser({
+      vm.issue.assignees = [new ListAssignee({
         id: 1,
         name: 'testing 123',
         username: 'test',
         avatar: 'test_image',
-      });
+      })];
 
       Vue.nextTick(() => {
         triggerEvent('mouseup', vm.$el.querySelector('img'));
diff --git a/spec/javascripts/boards/board_list_spec.js b/spec/javascripts/boards/board_list_spec.js
index 3f598887603..a89be911667 100644
--- a/spec/javascripts/boards/board_list_spec.js
+++ b/spec/javascripts/boards/board_list_spec.js
@@ -35,6 +35,7 @@ describe('Board list component', () => {
       iid: 1,
       confidential: false,
       labels: [],
+      assignees: [],
     });
     list.issuesSize = 1;
     list.issues.push(issue);
diff --git a/spec/javascripts/boards/boards_store_spec.js b/spec/javascripts/boards/boards_store_spec.js
index b55ff2f473a..5ea160b7790 100644
--- a/spec/javascripts/boards/boards_store_spec.js
+++ b/spec/javascripts/boards/boards_store_spec.js
@@ -8,14 +8,14 @@
 import Vue from 'vue';
 import Cookies from 'js-cookie';
 
-require('~/lib/utils/url_utility');
-require('~/boards/models/issue');
-require('~/boards/models/label');
-require('~/boards/models/list');
-require('~/boards/models/user');
-require('~/boards/services/board_service');
-require('~/boards/stores/boards_store');
-require('./mock_data');
+import '~/lib/utils/url_utility';
+import '~/boards/models/issue';
+import '~/boards/models/label';
+import '~/boards/models/list';
+import '~/boards/models/assignee';
+import '~/boards/services/board_service';
+import '~/boards/stores/boards_store';
+import './mock_data';
 
 describe('Store', () => {
   beforeEach(() => {
@@ -212,7 +212,8 @@ describe('Store', () => {
         title: 'Testing',
         iid: 2,
         confidential: false,
-        labels: []
+        labels: [],
+        assignees: [],
       });
       const list = gl.issueBoards.BoardsStore.addList(listObj);
 
diff --git a/spec/javascripts/boards/issue_card_spec.js b/spec/javascripts/boards/issue_card_spec.js
index ef567635d48..fddde799d01 100644
--- a/spec/javascripts/boards/issue_card_spec.js
+++ b/spec/javascripts/boards/issue_card_spec.js
@@ -1,20 +1,20 @@
-/* global ListUser */
+/* global ListAssignee */
 /* global ListLabel */
 /* global listObj */
 /* global ListIssue */
 
 import Vue from 'vue';
 
-require('~/boards/models/issue');
-require('~/boards/models/label');
-require('~/boards/models/list');
-require('~/boards/models/user');
-require('~/boards/stores/boards_store');
-require('~/boards/components/issue_card_inner');
-require('./mock_data');
+import '~/boards/models/issue';
+import '~/boards/models/label';
+import '~/boards/models/list';
+import '~/boards/models/assignee';
+import '~/boards/stores/boards_store';
+import '~/boards/components/issue_card_inner';
+import './mock_data';
 
 describe('Issue card component', () => {
-  const user = new ListUser({
+  const user = new ListAssignee({
     id: 1,
     name: 'testing 123',
     username: 'test',
@@ -40,6 +40,7 @@ describe('Issue card component', () => {
       iid: 1,
       confidential: false,
       labels: [list.label],
+      assignees: [],
     });
 
     component = new Vue({
@@ -92,12 +93,12 @@ describe('Issue card component', () => {
   it('renders confidential icon', (done) => {
     component.issue.confidential = true;
 
-    setTimeout(() => {
+    Vue.nextTick(() => {
       expect(
         component.$el.querySelector('.confidential-icon'),
       ).not.toBeNull();
       done();
-    }, 0);
+    });
   });
 
   it('renders issue ID with #', () => {
@@ -109,34 +110,32 @@ describe('Issue card component', () => {
   describe('assignee', () => {
     it('does not render assignee', () => {
       expect(
-        component.$el.querySelector('.card-assignee'),
+        component.$el.querySelector('.card-assignee .avatar'),
       ).toBeNull();
     });
 
     describe('exists', () => {
       beforeEach((done) => {
-        component.issue.assignee = user;
+        component.issue.assignees = [user];
 
-        setTimeout(() => {
-          done();
-        }, 0);
+        Vue.nextTick(() => done());
       });
 
       it('renders assignee', () => {
         expect(
-          component.$el.querySelector('.card-assignee'),
+          component.$el.querySelector('.card-assignee .avatar'),
         ).not.toBeNull();
       });
 
       it('sets title', () => {
         expect(
-          component.$el.querySelector('.card-assignee').getAttribute('title'),
+          component.$el.querySelector('.card-assignee a').getAttribute('title'),
         ).toContain(`Assigned to ${user.name}`);
       });
 
       it('sets users path', () => {
         expect(
-          component.$el.querySelector('.card-assignee').getAttribute('href'),
+          component.$el.querySelector('.card-assignee a').getAttribute('href'),
         ).toBe('/test');
       });
 
@@ -149,11 +148,11 @@ describe('Issue card component', () => {
 
     describe('assignee default avatar', () => {
       beforeEach((done) => {
-        component.issue.assignee = new ListUser({
+        component.issue.assignees = [new ListAssignee({
           id: 1,
           name: 'testing 123',
           username: 'test',
-        }, 'default_avatar');
+        }, 'default_avatar')];
 
         Vue.nextTick(done);
       });
@@ -169,6 +168,75 @@ describe('Issue card component', () => {
     });
   });
 
+  describe('multiple assignees', () => {
+    beforeEach((done) => {
+      component.issue.assignees = [
+        user,
+        new ListAssignee({
+          id: 2,
+          name: 'user2',
+          username: 'user2',
+          avatar: 'test_image',
+        }),
+        new ListAssignee({
+          id: 3,
+          name: 'user3',
+          username: 'user3',
+          avatar: 'test_image',
+        }),
+        new ListAssignee({
+          id: 4,
+          name: 'user4',
+          username: 'user4',
+          avatar: 'test_image',
+        })];
+
+      Vue.nextTick(() => done());
+    });
+
+    it('renders all four assignees', () => {
+      expect(component.$el.querySelectorAll('.card-assignee .avatar').length).toEqual(4);
+    });
+
+    describe('more than four assignees', () => {
+      beforeEach((done) => {
+        component.issue.assignees.push(new ListAssignee({
+          id: 5,
+          name: 'user5',
+          username: 'user5',
+          avatar: 'test_image',
+        }));
+
+        Vue.nextTick(() => done());
+      });
+
+      it('renders more avatar counter', () => {
+        expect(component.$el.querySelector('.card-assignee .avatar-counter').innerText).toEqual('+2');
+      });
+
+      it('renders three assignees', () => {
+        expect(component.$el.querySelectorAll('.card-assignee .avatar').length).toEqual(3);
+      });
+
+      it('renders 99+ avatar counter', (done) => {
+        for (let i = 5; i < 104; i += 1) {
+          const u = new ListAssignee({
+            id: i,
+            name: 'name',
+            username: 'username',
+            avatar: 'test_image',
+          });
+          component.issue.assignees.push(u);
+        }
+
+        Vue.nextTick(() => {
+          expect(component.$el.querySelector('.card-assignee .avatar-counter').innerText).toEqual('99+');
+          done();
+        });
+      });
+    });
+  });
+
   describe('labels', () => {
     it('does not render any', () => {
       expect(
@@ -180,9 +248,7 @@ describe('Issue card component', () => {
       beforeEach((done) => {
         component.issue.addLabel(label1);
 
-        setTimeout(() => {
-          done();
-        }, 0);
+        Vue.nextTick(() => done());
       });
 
       it('does not render list label', () => {
diff --git a/spec/javascripts/boards/issue_spec.js b/spec/javascripts/boards/issue_spec.js
index c96dfe94a4a..cd1497bc5e6 100644
--- a/spec/javascripts/boards/issue_spec.js
+++ b/spec/javascripts/boards/issue_spec.js
@@ -2,14 +2,15 @@
 /* global BoardService */
 /* global ListIssue */
 
-require('~/lib/utils/url_utility');
-require('~/boards/models/issue');
-require('~/boards/models/label');
-require('~/boards/models/list');
-require('~/boards/models/user');
-require('~/boards/services/board_service');
-require('~/boards/stores/boards_store');
-require('./mock_data');
+import Vue from 'vue';
+import '~/lib/utils/url_utility';
+import '~/boards/models/issue';
+import '~/boards/models/label';
+import '~/boards/models/list';
+import '~/boards/models/assignee';
+import '~/boards/services/board_service';
+import '~/boards/stores/boards_store';
+import './mock_data';
 
 describe('Issue model', () => {
   let issue;
@@ -27,7 +28,13 @@ describe('Issue model', () => {
         title: 'test',
         color: 'red',
         description: 'testing'
-      }]
+      }],
+      assignees: [{
+        id: 1,
+        name: 'name',
+        username: 'username',
+        avatar_url: 'http://avatar_url',
+      }],
     });
   });
 
@@ -80,6 +87,33 @@ describe('Issue model', () => {
     expect(issue.labels.length).toBe(0);
   });
 
+  it('adds assignee', () => {
+    issue.addAssignee({
+      id: 2,
+      name: 'Bruce Wayne',
+      username: 'batman',
+      avatar_url: 'http://batman',
+    });
+
+    expect(issue.assignees.length).toBe(2);
+  });
+
+  it('finds assignee', () => {
+    const assignee = issue.findAssignee(issue.assignees[0]);
+    expect(assignee).toBeDefined();
+  });
+
+  it('removes assignee', () => {
+    const assignee = issue.findAssignee(issue.assignees[0]);
+    issue.removeAssignee(assignee);
+    expect(issue.assignees.length).toBe(0);
+  });
+
+  it('removes all assignees', () => {
+    issue.removeAllAssignees();
+    expect(issue.assignees.length).toBe(0);
+  });
+
   it('sets position to infinity if no position is stored', () => {
     expect(issue.position).toBe(Infinity);
   });
@@ -90,9 +124,31 @@ describe('Issue model', () => {
       iid: 1,
       confidential: false,
       relative_position: 1,
-      labels: []
+      labels: [],
+      assignees: [],
     });
 
     expect(relativePositionIssue.position).toBe(1);
   });
+
+  describe('update', () => {
+    it('passes assignee ids when there are assignees', (done) => {
+      spyOn(Vue.http, 'patch').and.callFake((url, data) => {
+        expect(data.issue.assignee_ids).toEqual([1]);
+        done();
+      });
+
+      issue.update('url');
+    });
+
+    it('passes assignee ids of [0] when there are no assignees', (done) => {
+      spyOn(Vue.http, 'patch').and.callFake((url, data) => {
+        expect(data.issue.assignee_ids).toEqual([0]);
+        done();
+      });
+
+      issue.removeAllAssignees();
+      issue.update('url');
+    });
+  });
 });
diff --git a/spec/javascripts/boards/list_spec.js b/spec/javascripts/boards/list_spec.js
index 24a2da9f6b6..8e3d9fd77a0 100644
--- a/spec/javascripts/boards/list_spec.js
+++ b/spec/javascripts/boards/list_spec.js
@@ -8,14 +8,14 @@
 
 import Vue from 'vue';
 
-require('~/lib/utils/url_utility');
-require('~/boards/models/issue');
-require('~/boards/models/label');
-require('~/boards/models/list');
-require('~/boards/models/user');
-require('~/boards/services/board_service');
-require('~/boards/stores/boards_store');
-require('./mock_data');
+import '~/lib/utils/url_utility';
+import '~/boards/models/issue';
+import '~/boards/models/label';
+import '~/boards/models/list';
+import '~/boards/models/assignee';
+import '~/boards/services/board_service';
+import '~/boards/stores/boards_store';
+import './mock_data';
 
 describe('List model', () => {
   let list;
@@ -94,7 +94,8 @@ describe('List model', () => {
       title: 'Testing',
       iid: _.random(10000),
       confidential: false,
-      labels: [list.label, listDup.label]
+      labels: [list.label, listDup.label],
+      assignees: [],
     });
 
     list.issues.push(issue);
@@ -119,7 +120,8 @@ describe('List model', () => {
           title: 'Testing',
           iid: _.random(10000) + i,
           confidential: false,
-          labels: [list.label]
+          labels: [list.label],
+          assignees: [],
         }));
       }
       list.issuesSize = 50;
@@ -137,7 +139,8 @@ describe('List model', () => {
         title: 'Testing',
         iid: _.random(10000),
         confidential: false,
-        labels: [list.label]
+        labels: [list.label],
+        assignees: [],
       }));
       list.issuesSize = 2;
 
diff --git a/spec/javascripts/boards/mock_data.js b/spec/javascripts/boards/mock_data.js
index a4fa694eebe..a64c3964ee3 100644
--- a/spec/javascripts/boards/mock_data.js
+++ b/spec/javascripts/boards/mock_data.js
@@ -33,7 +33,8 @@ const BoardsMockData = {
         title: 'Testing',
         iid: 1,
         confidential: false,
-        labels: []
+        labels: [],
+        assignees: [],
       }],
       size: 1
     }
diff --git a/spec/javascripts/boards/modal_store_spec.js b/spec/javascripts/boards/modal_store_spec.js
index 80db816aff8..32e6d04df9f 100644
--- a/spec/javascripts/boards/modal_store_spec.js
+++ b/spec/javascripts/boards/modal_store_spec.js
@@ -1,10 +1,10 @@
 /* global ListIssue */
 
-require('~/boards/models/issue');
-require('~/boards/models/label');
-require('~/boards/models/list');
-require('~/boards/models/user');
-require('~/boards/stores/modal_store');
+import '~/boards/models/issue';
+import '~/boards/models/label';
+import '~/boards/models/list';
+import '~/boards/models/assignee';
+import '~/boards/stores/modal_store';
 
 describe('Modal store', () => {
   let issue;
@@ -21,12 +21,14 @@ describe('Modal store', () => {
       iid: 1,
       confidential: false,
       labels: [],
+      assignees: [],
     });
     issue2 = new ListIssue({
       title: 'Testing',
       iid: 2,
       confidential: false,
       labels: [],
+      assignees: [],
     });
     Store.store.issues.push(issue);
     Store.store.issues.push(issue2);
diff --git a/spec/javascripts/droplab/constants_spec.js b/spec/javascripts/droplab/constants_spec.js
index fd153a49fcd..b9d28db74cc 100644
--- a/spec/javascripts/droplab/constants_spec.js
+++ b/spec/javascripts/droplab/constants_spec.js
@@ -27,6 +27,12 @@ describe('constants', function () {
     });
   });
 
+  describe('TEMPLATE_REGEX', function () {
+    it('should be a handlebars templating syntax regex', function() {
+      expect(constants.TEMPLATE_REGEX).toEqual(/\{\{(.+?)\}\}/g);
+    });
+  });
+
   describe('IGNORE_CLASS', function () {
     it('should be `droplab-item-ignore`', function() {
       expect(constants.IGNORE_CLASS).toBe('droplab-item-ignore');
diff --git a/spec/javascripts/droplab/drop_down_spec.js b/spec/javascripts/droplab/drop_down_spec.js
index 7516b301917..e7786e8cc2c 100644
--- a/spec/javascripts/droplab/drop_down_spec.js
+++ b/spec/javascripts/droplab/drop_down_spec.js
@@ -451,7 +451,7 @@ describe('DropDown', function () {
       this.html = 'html';
       this.template = { firstChild: { outerHTML: 'outerHTML', style: {} } };
 
-      spyOn(utils, 't').and.returnValue(this.html);
+      spyOn(utils, 'template').and.returnValue(this.html);
       spyOn(document, 'createElement').and.returnValue(this.template);
       spyOn(this.dropdown, 'setImagesSrc');
 
@@ -459,7 +459,7 @@ describe('DropDown', function () {
     });
 
     it('should call utils.t with .templateString and data', function () {
-      expect(utils.t).toHaveBeenCalledWith(this.templateString, this.data);
+      expect(utils.template).toHaveBeenCalledWith(this.templateString, this.data);
     });
 
     it('should call document.createElement', function () {
diff --git a/spec/javascripts/filtered_search/components/recent_searches_dropdown_content_spec.js b/spec/javascripts/filtered_search/components/recent_searches_dropdown_content_spec.js
index 2722882375f..d0f09a561d5 100644
--- a/spec/javascripts/filtered_search/components/recent_searches_dropdown_content_spec.js
+++ b/spec/javascripts/filtered_search/components/recent_searches_dropdown_content_spec.js
@@ -76,6 +76,26 @@ describe('RecentSearchesDropdownContent', () => {
     });
   });
 
+  describe('if isLocalStorageAvailable is `false`', () => {
+    let el;
+
+    beforeEach(() => {
+      const props = Object.assign({ isLocalStorageAvailable: false }, propsDataWithItems);
+
+      vm = createComponent(props);
+      el = vm.$el;
+    });
+
+    it('should render an info note', () => {
+      const note = el.querySelector('.dropdown-info-note');
+      const items = el.querySelectorAll('.filtered-search-history-dropdown-item');
+
+      expect(note).toBeDefined();
+      expect(note.innerText.trim()).toBe('This feature requires local storage to be enabled');
+      expect(items.length).toEqual(propsDataWithoutItems.items.length);
+    });
+  });
+
   describe('computed', () => {
     describe('processedItems', () => {
       it('with items', () => {
diff --git a/spec/javascripts/filtered_search/filtered_search_manager_spec.js b/spec/javascripts/filtered_search/filtered_search_manager_spec.js
index e747aa497c2..063d547d00c 100644
--- a/spec/javascripts/filtered_search/filtered_search_manager_spec.js
+++ b/spec/javascripts/filtered_search/filtered_search_manager_spec.js
@@ -1,3 +1,7 @@
+import * as recentSearchesStoreSrc from '~/filtered_search/stores/recent_searches_store';
+import RecentSearchesService from '~/filtered_search/services/recent_searches_service';
+import RecentSearchesServiceError from '~/filtered_search/services/recent_searches_service_error';
+
 require('~/lib/utils/url_utility');
 require('~/lib/utils/common_utils');
 require('~/filtered_search/filtered_search_token_keys');
@@ -60,6 +64,36 @@ describe('Filtered Search Manager', () => {
     manager.cleanup();
   });
 
+  describe('class constructor', () => {
+    const isLocalStorageAvailable = 'isLocalStorageAvailable';
+    let filteredSearchManager;
+
+    beforeEach(() => {
+      spyOn(RecentSearchesService, 'isAvailable').and.returnValue(isLocalStorageAvailable);
+      spyOn(recentSearchesStoreSrc, 'default');
+
+      filteredSearchManager = new gl.FilteredSearchManager();
+
+      return filteredSearchManager;
+    });
+
+    it('should instantiate RecentSearchesStore with isLocalStorageAvailable', () => {
+      expect(RecentSearchesService.isAvailable).toHaveBeenCalled();
+      expect(recentSearchesStoreSrc.default).toHaveBeenCalledWith({
+        isLocalStorageAvailable,
+      });
+    });
+
+    it('should not instantiate Flash if an RecentSearchesServiceError is caught', () => {
+      spyOn(RecentSearchesService.prototype, 'fetch').and.callFake(() => Promise.reject(new RecentSearchesServiceError()));
+      spyOn(window, 'Flash');
+
+      filteredSearchManager = new gl.FilteredSearchManager();
+
+      expect(window.Flash).not.toHaveBeenCalled();
+    });
+  });
+
   describe('search', () => {
     const defaultParams = '?scope=all&utf8=%E2%9C%93&state=opened';
 
diff --git a/spec/javascripts/filtered_search/filtered_search_visual_tokens_spec.js b/spec/javascripts/filtered_search/filtered_search_visual_tokens_spec.js
index d75b9061281..8b750561eb7 100644
--- a/spec/javascripts/filtered_search/filtered_search_visual_tokens_spec.js
+++ b/spec/javascripts/filtered_search/filtered_search_visual_tokens_spec.js
@@ -1,3 +1,5 @@
+import AjaxCache from '~/lib/utils/ajax_cache';
+
 require('~/filtered_search/filtered_search_visual_tokens');
 const FilteredSearchSpecHelper = require('../helpers/filtered_search_spec_helper');
 
@@ -611,4 +613,103 @@ describe('Filtered Search Visual Tokens', () => {
       expect(token.querySelector('.value').innerText).toEqual('~bug');
     });
   });
+
+  describe('renderVisualTokenValue', () => {
+    let searchTokens;
+
+    beforeEach(() => {
+      tokensContainer.innerHTML = FilteredSearchSpecHelper.createTokensContainerHTML(`
+        ${FilteredSearchSpecHelper.createFilterVisualTokenHTML('label', 'none')}
+        ${FilteredSearchSpecHelper.createSearchVisualTokenHTML('search')}
+        ${FilteredSearchSpecHelper.createFilterVisualTokenHTML('milestone', 'upcoming')}
+      `);
+
+      searchTokens = document.querySelectorAll('.filtered-search-token');
+    });
+
+    it('renders a token value element', () => {
+      spyOn(gl.FilteredSearchVisualTokens, 'updateLabelTokenColor');
+      const updateLabelTokenColorSpy = gl.FilteredSearchVisualTokens.updateLabelTokenColor;
+
+      expect(searchTokens.length).toBe(2);
+      Array.prototype.forEach.call(searchTokens, (token) => {
+        updateLabelTokenColorSpy.calls.reset();
+
+        const tokenName = token.querySelector('.name').innerText;
+        const tokenValue = 'new value';
+        gl.FilteredSearchVisualTokens.renderVisualTokenValue(token, tokenName, tokenValue);
+
+        const tokenValueElement = token.querySelector('.value');
+        expect(tokenValueElement.innerText).toBe(tokenValue);
+
+        if (tokenName.toLowerCase() === 'label') {
+          const tokenValueContainer = token.querySelector('.value-container');
+          expect(updateLabelTokenColorSpy.calls.count()).toBe(1);
+          const expectedArgs = [tokenValueContainer, tokenValue];
+          expect(updateLabelTokenColorSpy.calls.argsFor(0)).toEqual(expectedArgs);
+        } else {
+          expect(updateLabelTokenColorSpy.calls.count()).toBe(0);
+        }
+      });
+    });
+  });
+
+  describe('updateLabelTokenColor', () => {
+    const jsonFixtureName = 'labels/project_labels.json';
+    const dummyEndpoint = '/dummy/endpoint';
+
+    preloadFixtures(jsonFixtureName);
+    const labelData = getJSONFixture(jsonFixtureName);
+    const findLabel = tokenValue => labelData.find(
+      label => tokenValue === `~${gl.DropdownUtils.getEscapedText(label.title)}`,
+    );
+
+    const bugLabelToken = FilteredSearchSpecHelper.createFilterVisualToken('label', '~bug');
+    const missingLabelToken = FilteredSearchSpecHelper.createFilterVisualToken('label', '~doesnotexist');
+    const spaceLabelToken = FilteredSearchSpecHelper.createFilterVisualToken('label', '~"some space"');
+
+    const parseColor = (color) => {
+      const dummyElement = document.createElement('div');
+      dummyElement.style.color = color;
+      return dummyElement.style.color;
+    };
+
+    beforeEach(() => {
+      tokensContainer.innerHTML = FilteredSearchSpecHelper.createTokensContainerHTML(`
+        ${bugLabelToken.outerHTML}
+        ${missingLabelToken.outerHTML}
+        ${spaceLabelToken.outerHTML}
+      `);
+
+      const filteredSearchInput = document.querySelector('.filtered-search');
+      filteredSearchInput.dataset.baseEndpoint = dummyEndpoint;
+
+      AjaxCache.internalStorage = { };
+      AjaxCache.internalStorage[`${dummyEndpoint}/labels.json`] = labelData;
+    });
+
+    const testCase = (token, done) => {
+      const tokenValueContainer = token.querySelector('.value-container');
+      const tokenValue = token.querySelector('.value').innerText;
+      const label = findLabel(tokenValue);
+
+      gl.FilteredSearchVisualTokens.updateLabelTokenColor(tokenValueContainer, tokenValue)
+      .then(() => {
+        if (label) {
+          expect(tokenValueContainer.getAttribute('style')).not.toBe(null);
+          expect(tokenValueContainer.style.backgroundColor).toBe(parseColor(label.color));
+          expect(tokenValueContainer.style.color).toBe(parseColor(label.text_color));
+        } else {
+          expect(token).toBe(missingLabelToken);
+          expect(tokenValueContainer.getAttribute('style')).toBe(null);
+        }
+      })
+      .then(done)
+      .catch(fail);
+    };
+
+    it('updates the color of a label token', done => testCase(bugLabelToken, done));
+    it('updates the color of a label token with spaces', done => testCase(spaceLabelToken, done));
+    it('does not change color of a missing label', done => testCase(missingLabelToken, done));
+  });
 });
diff --git a/spec/javascripts/filtered_search/recent_searches_root_spec.js b/spec/javascripts/filtered_search/recent_searches_root_spec.js
new file mode 100644
index 00000000000..d8ba6de5f45
--- /dev/null
+++ b/spec/javascripts/filtered_search/recent_searches_root_spec.js
@@ -0,0 +1,31 @@
+import RecentSearchesRoot from '~/filtered_search/recent_searches_root';
+import * as vueSrc from 'vue';
+
+describe('RecentSearchesRoot', () => {
+  describe('render', () => {
+    let recentSearchesRoot;
+    let data;
+    let template;
+
+    beforeEach(() => {
+      recentSearchesRoot = {
+        store: {
+          state: 'state',
+        },
+      };
+
+      spyOn(vueSrc, 'default').and.callFake((options) => {
+        data = options.data;
+        template = options.template;
+      });
+
+      RecentSearchesRoot.prototype.render.call(recentSearchesRoot);
+    });
+
+    it('should instantiate Vue', () => {
+      expect(vueSrc.default).toHaveBeenCalled();
+      expect(data()).toBe(recentSearchesRoot.store.state);
+      expect(template).toContain(':is-local-storage-available="isLocalStorageAvailable"');
+    });
+  });
+});
diff --git a/spec/javascripts/filtered_search/services/recent_searches_service_error_spec.js b/spec/javascripts/filtered_search/services/recent_searches_service_error_spec.js
new file mode 100644
index 00000000000..ea7c146fa4f
--- /dev/null
+++ b/spec/javascripts/filtered_search/services/recent_searches_service_error_spec.js
@@ -0,0 +1,18 @@
+import RecentSearchesServiceError from '~/filtered_search/services/recent_searches_service_error';
+
+describe('RecentSearchesServiceError', () => {
+  let recentSearchesServiceError;
+
+  beforeEach(() => {
+    recentSearchesServiceError = new RecentSearchesServiceError();
+  });
+
+  it('instantiates an instance of RecentSearchesServiceError and not an Error', () => {
+    expect(recentSearchesServiceError).toEqual(jasmine.any(RecentSearchesServiceError));
+    expect(recentSearchesServiceError.name).toBe('RecentSearchesServiceError');
+  });
+
+  it('should set a default message', () => {
+    expect(recentSearchesServiceError.message).toBe('Recent Searches Service is unavailable');
+  });
+});
diff --git a/spec/javascripts/filtered_search/services/recent_searches_service_spec.js b/spec/javascripts/filtered_search/services/recent_searches_service_spec.js
index c255bf7c939..31fa478804a 100644
--- a/spec/javascripts/filtered_search/services/recent_searches_service_spec.js
+++ b/spec/javascripts/filtered_search/services/recent_searches_service_spec.js
@@ -1,6 +1,7 @@
 /* eslint-disable promise/catch-or-return */
 
 import RecentSearchesService from '~/filtered_search/services/recent_searches_service';
+import AccessorUtilities from '~/lib/utils/accessor';
 
 describe('RecentSearchesService', () => {
   let service;
@@ -11,6 +12,10 @@ describe('RecentSearchesService', () => {
   });
 
   describe('fetch', () => {
+    beforeEach(() => {
+      spyOn(RecentSearchesService, 'isAvailable').and.returnValue(true);
+    });
+
     it('should default to empty array', (done) => {
       const fetchItemsPromise = service.fetch();
 
@@ -29,11 +34,21 @@ describe('RecentSearchesService', () => {
       const fetchItemsPromise = service.fetch();
 
       fetchItemsPromise
-        .catch(() => {
+        .catch((error) => {
+          expect(error).toEqual(jasmine.any(SyntaxError));
           done();
         });
     });
 
+    it('should reject when service is unavailable', (done) => {
+      RecentSearchesService.isAvailable.and.returnValue(false);
+
+      service.fetch().catch((error) => {
+        expect(error).toEqual(jasmine.any(Error));
+        done();
+      });
+    });
+
     it('should return items from localStorage', (done) => {
       window.localStorage.setItem(service.localStorageKey, '["foo", "bar"]');
       const fetchItemsPromise = service.fetch();
@@ -44,15 +59,89 @@ describe('RecentSearchesService', () => {
           done();
         });
     });
+
+    describe('if .isAvailable returns `false`', () => {
+      beforeEach(() => {
+        RecentSearchesService.isAvailable.and.returnValue(false);
+
+        spyOn(window.localStorage, 'getItem');
+
+        RecentSearchesService.prototype.fetch();
+      });
+
+      it('should not call .getItem', () => {
+        expect(window.localStorage.getItem).not.toHaveBeenCalled();
+      });
+    });
   });
 
   describe('setRecentSearches', () => {
+    beforeEach(() => {
+      spyOn(RecentSearchesService, 'isAvailable').and.returnValue(true);
+    });
+
     it('should save things in localStorage', () => {
       const items = ['foo', 'bar'];
       service.save(items);
-      const newLocalStorageValue =
-        window.localStorage.getItem(service.localStorageKey);
+      const newLocalStorageValue = window.localStorage.getItem(service.localStorageKey);
       expect(JSON.parse(newLocalStorageValue)).toEqual(items);
     });
   });
+
+  describe('save', () => {
+    beforeEach(() => {
+      spyOn(window.localStorage, 'setItem');
+      spyOn(RecentSearchesService, 'isAvailable');
+    });
+
+    describe('if .isAvailable returns `true`', () => {
+      const searchesString = 'searchesString';
+      const localStorageKey = 'localStorageKey';
+      const recentSearchesService = {
+        localStorageKey,
+      };
+
+      beforeEach(() => {
+        RecentSearchesService.isAvailable.and.returnValue(true);
+
+        spyOn(JSON, 'stringify').and.returnValue(searchesString);
+
+        RecentSearchesService.prototype.save.call(recentSearchesService);
+      });
+
+      it('should call .setItem', () => {
+        expect(window.localStorage.setItem).toHaveBeenCalledWith(localStorageKey, searchesString);
+      });
+    });
+
+    describe('if .isAvailable returns `false`', () => {
+      beforeEach(() => {
+        RecentSearchesService.isAvailable.and.returnValue(false);
+
+        RecentSearchesService.prototype.save();
+      });
+
+      it('should not call .setItem', () => {
+        expect(window.localStorage.setItem).not.toHaveBeenCalled();
+      });
+    });
+  });
+
+  describe('isAvailable', () => {
+    let isAvailable;
+
+    beforeEach(() => {
+      spyOn(AccessorUtilities, 'isLocalStorageAccessSafe').and.callThrough();
+
+      isAvailable = RecentSearchesService.isAvailable();
+    });
+
+    it('should call .isLocalStorageAccessSafe', () => {
+      expect(AccessorUtilities.isLocalStorageAccessSafe).toHaveBeenCalled();
+    });
+
+    it('should return a boolean', () => {
+      expect(typeof isAvailable).toBe('boolean');
+    });
+  });
 });
diff --git a/spec/javascripts/fixtures/labels.rb b/spec/javascripts/fixtures/labels.rb
new file mode 100644
index 00000000000..2e4811b64a4
--- /dev/null
+++ b/spec/javascripts/fixtures/labels.rb
@@ -0,0 +1,56 @@
+require 'spec_helper'
+
+describe 'Labels (JavaScript fixtures)' do
+  include JavaScriptFixturesHelpers
+
+  let(:admin) { create(:admin) }
+  let(:group) { create(:group, name: 'frontend-fixtures-group' )}
+  let(:project) { create(:project_empty_repo, namespace: group, path: 'labels-project') }
+
+  let!(:project_label_bug) { create(:label, project: project, title: 'bug', color: '#FF0000') }
+  let!(:project_label_enhancement) { create(:label, project: project, title: 'enhancement', color: '#00FF00') }
+  let!(:project_label_feature) { create(:label, project: project, title: 'feature', color: '#0000FF') }
+
+  let!(:group_label_roses) { create(:group_label, group: group, title: 'roses', color: '#FF0000') }
+  let!(:groub_label_space) { create(:group_label, group: group, title: 'some space', color: '#FFFFFF') }
+  let!(:groub_label_violets) { create(:group_label, group: group, title: 'violets', color: '#0000FF') }
+
+  before(:all) do
+    clean_frontend_fixtures('labels/')
+  end
+
+  describe Groups::LabelsController, '(JavaScript fixtures)', type: :controller do
+    render_views
+
+    before(:each) do
+      sign_in(admin)
+    end
+
+    it 'labels/group_labels.json' do |example|
+      get :index,
+        group_id: group,
+        format: 'json'
+
+      expect(response).to be_success
+      store_frontend_fixture(response, example.description)
+    end
+  end
+
+  describe Projects::LabelsController, '(JavaScript fixtures)', type: :controller do
+    render_views
+
+    before(:each) do
+      sign_in(admin)
+    end
+
+    it 'labels/project_labels.json' do |example|
+      get :index,
+        namespace_id: group,
+        project_id: project,
+        format: 'json'
+
+      expect(response).to be_success
+      store_frontend_fixture(response, example.description)
+    end
+  end
+end
diff --git a/spec/javascripts/helpers/user_mock_data_helper.js b/spec/javascripts/helpers/user_mock_data_helper.js
new file mode 100644
index 00000000000..a9783ea065c
--- /dev/null
+++ b/spec/javascripts/helpers/user_mock_data_helper.js
@@ -0,0 +1,16 @@
+export default {
+  createNumberRandomUsers(numberUsers) {
+    const users = [];
+    for (let i = 0; i < numberUsers; i = i += 1) {
+      users.push(
+        {
+          avatar: 'http://gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80&d=identicon',
+          id: (i + 1),
+          name: `GitLab User ${i}`,
+          username: `gitlab${i}`,
+        },
+      );
+    }
+    return users;
+  },
+};
diff --git a/spec/javascripts/issuable_time_tracker_spec.js b/spec/javascripts/issuable_time_tracker_spec.js
index 0a830f25e29..8ff93c4f918 100644
--- a/spec/javascripts/issuable_time_tracker_spec.js
+++ b/spec/javascripts/issuable_time_tracker_spec.js
@@ -2,7 +2,7 @@
 
 import Vue from 'vue';
 
-require('~/issuable/time_tracking/components/time_tracker');
+import timeTracker from '~/sidebar/components/time_tracking/time_tracker';
 
 function initTimeTrackingComponent(opts) {
   setFixtures(`
@@ -16,187 +16,185 @@ function initTimeTrackingComponent(opts) {
     time_spent: opts.timeSpent,
     human_time_estimate: opts.timeEstimateHumanReadable,
     human_time_spent: opts.timeSpentHumanReadable,
-    docsUrl: '/help/workflow/time_tracking.md',
+    rootPath: '/',
   };
 
-  const TimeTrackingComponent = Vue.component('issuable-time-tracker');
+  const TimeTrackingComponent = Vue.extend(timeTracker);
   this.timeTracker = new TimeTrackingComponent({
     el: '#mock-container',
     propsData: this.initialData,
   });
 }
 
-((gl) => {
-  describe('Issuable Time Tracker', function() {
-    describe('Initialization', function() {
-      beforeEach(function() {
-        initTimeTrackingComponent.call(this, { timeEstimate: 100000, timeSpent: 5000, timeEstimateHumanReadable: '2h 46m', timeSpentHumanReadable: '1h 23m' });
-      });
+describe('Issuable Time Tracker', function() {
+  describe('Initialization', function() {
+    beforeEach(function() {
+      initTimeTrackingComponent.call(this, { timeEstimate: 100000, timeSpent: 5000, timeEstimateHumanReadable: '2h 46m', timeSpentHumanReadable: '1h 23m' });
+    });
 
-      it('should return something defined', function() {
-        expect(this.timeTracker).toBeDefined();
-      });
+    it('should return something defined', function() {
+      expect(this.timeTracker).toBeDefined();
+    });
 
-      it ('should correctly set timeEstimate', function(done) {
-        Vue.nextTick(() => {
-          expect(this.timeTracker.timeEstimate).toBe(this.initialData.time_estimate);
-          done();
-        });
+    it ('should correctly set timeEstimate', function(done) {
+      Vue.nextTick(() => {
+        expect(this.timeTracker.timeEstimate).toBe(this.initialData.time_estimate);
+        done();
       });
-      it ('should correctly set time_spent', function(done) {
-        Vue.nextTick(() => {
-          expect(this.timeTracker.timeSpent).toBe(this.initialData.time_spent);
-          done();
-        });
+    });
+    it ('should correctly set time_spent', function(done) {
+      Vue.nextTick(() => {
+        expect(this.timeTracker.timeSpent).toBe(this.initialData.time_spent);
+        done();
       });
     });
+  });
 
-    describe('Content Display', function() {
-      describe('Panes', function() {
-        describe('Comparison pane', function() {
-          beforeEach(function() {
-            initTimeTrackingComponent.call(this, { timeEstimate: 100000, timeSpent: 5000, timeEstimateHumanReadable: '', timeSpentHumanReadable: '' });
+  describe('Content Display', function() {
+    describe('Panes', function() {
+      describe('Comparison pane', function() {
+        beforeEach(function() {
+          initTimeTrackingComponent.call(this, { timeEstimate: 100000, timeSpent: 5000, timeEstimateHumanReadable: '', timeSpentHumanReadable: '' });
+        });
+
+        it('should show the "Comparison" pane when timeEstimate and time_spent are truthy', function(done) {
+          Vue.nextTick(() => {
+            const $comparisonPane = this.timeTracker.$el.querySelector('.time-tracking-comparison-pane');
+            expect(this.timeTracker.showComparisonState).toBe(true);
+            done();
           });
+        });
 
-          it('should show the "Comparison" pane when timeEstimate and time_spent are truthy', function(done) {
+        describe('Remaining meter', function() {
+          it('should display the remaining meter with the correct width', function(done) {
             Vue.nextTick(() => {
-              const $comparisonPane = this.timeTracker.$el.querySelector('.time-tracking-comparison-pane');
-              expect(this.timeTracker.showComparisonState).toBe(true);
+              const meterWidth = this.timeTracker.$el.querySelector('.time-tracking-comparison-pane .meter-fill').style.width;
+              const correctWidth = '5%';
+
+              expect(meterWidth).toBe(correctWidth);
               done();
-            });
+            })
           });
 
-          describe('Remaining meter', function() {
-            it('should display the remaining meter with the correct width', function(done) {
-              Vue.nextTick(() => {
-                const meterWidth = this.timeTracker.$el.querySelector('.time-tracking-comparison-pane .meter-fill').style.width;
-                const correctWidth = '5%';
-
-                expect(meterWidth).toBe(correctWidth);
-                done();
-              })
-            });
-
-            it('should display the remaining meter with the correct background color when within estimate', function(done) {
-              Vue.nextTick(() => {
-                const styledMeter = $(this.timeTracker.$el).find('.time-tracking-comparison-pane .within_estimate .meter-fill');
-                expect(styledMeter.length).toBe(1);
-                done()
-              });
+          it('should display the remaining meter with the correct background color when within estimate', function(done) {
+            Vue.nextTick(() => {
+              const styledMeter = $(this.timeTracker.$el).find('.time-tracking-comparison-pane .within_estimate .meter-fill');
+              expect(styledMeter.length).toBe(1);
+              done()
             });
+          });
 
-            it('should display the remaining meter with the correct background color when over estimate', function(done) {
-              this.timeTracker.time_estimate = 100000;
-              this.timeTracker.time_spent = 20000000;
-              Vue.nextTick(() => {
-                const styledMeter = $(this.timeTracker.$el).find('.time-tracking-comparison-pane .over_estimate .meter-fill');
-                expect(styledMeter.length).toBe(1);
-                done();
-              });
+          it('should display the remaining meter with the correct background color when over estimate', function(done) {
+            this.timeTracker.time_estimate = 100000;
+            this.timeTracker.time_spent = 20000000;
+            Vue.nextTick(() => {
+              const styledMeter = $(this.timeTracker.$el).find('.time-tracking-comparison-pane .over_estimate .meter-fill');
+              expect(styledMeter.length).toBe(1);
+              done();
             });
           });
         });
+      });
 
-        describe("Estimate only pane", function() {
-          beforeEach(function() {
-            initTimeTrackingComponent.call(this, { timeEstimate: 100000, timeSpent: 0, timeEstimateHumanReadable: '2h 46m', timeSpentHumanReadable: '' });
-          });
+      describe("Estimate only pane", function() {
+        beforeEach(function() {
+          initTimeTrackingComponent.call(this, { timeEstimate: 100000, timeSpent: 0, timeEstimateHumanReadable: '2h 46m', timeSpentHumanReadable: '' });
+        });
 
-          it('should display the human readable version of time estimated', function(done) {
-            Vue.nextTick(() => {
-              const estimateText = this.timeTracker.$el.querySelector('.time-tracking-estimate-only-pane').innerText;
-              const correctText = 'Estimated: 2h 46m';
+        it('should display the human readable version of time estimated', function(done) {
+          Vue.nextTick(() => {
+            const estimateText = this.timeTracker.$el.querySelector('.time-tracking-estimate-only-pane').innerText;
+            const correctText = 'Estimated: 2h 46m';
 
-              expect(estimateText).toBe(correctText);
-              done();
-            });
+            expect(estimateText).toBe(correctText);
+            done();
           });
         });
+      });
 
-        describe('Spent only pane', function() {
-          beforeEach(function() {
-            initTimeTrackingComponent.call(this, { timeEstimate: 0, timeSpent: 5000, timeEstimateHumanReadable: '2h 46m', timeSpentHumanReadable: '1h 23m' });
-          });
+      describe('Spent only pane', function() {
+        beforeEach(function() {
+          initTimeTrackingComponent.call(this, { timeEstimate: 0, timeSpent: 5000, timeEstimateHumanReadable: '2h 46m', timeSpentHumanReadable: '1h 23m' });
+        });
 
-          it('should display the human readable version of time spent', function(done) {
-            Vue.nextTick(() => {
-              const spentText = this.timeTracker.$el.querySelector('.time-tracking-spend-only-pane').innerText;
-              const correctText = 'Spent: 1h 23m';
+        it('should display the human readable version of time spent', function(done) {
+          Vue.nextTick(() => {
+            const spentText = this.timeTracker.$el.querySelector('.time-tracking-spend-only-pane').innerText;
+            const correctText = 'Spent: 1h 23m';
 
-              expect(spentText).toBe(correctText);
-              done();
-            });
+            expect(spentText).toBe(correctText);
+            done();
           });
         });
+      });
 
-        describe('No time tracking pane', function() {
-          beforeEach(function() {
-            initTimeTrackingComponent.call(this, { timeEstimate: 0, timeSpent: 0, timeEstimateHumanReadable: 0, timeSpentHumanReadable: 0 });
-          });
+      describe('No time tracking pane', function() {
+        beforeEach(function() {
+          initTimeTrackingComponent.call(this, { timeEstimate: 0, timeSpent: 0, timeEstimateHumanReadable: '', timeSpentHumanReadable: '' });
+        });
 
-          it('should only show the "No time tracking" pane when both timeEstimate and time_spent are falsey', function(done) {
-            Vue.nextTick(() => {
-              const $noTrackingPane = this.timeTracker.$el.querySelector('.time-tracking-no-tracking-pane');
-              const noTrackingText =$noTrackingPane.innerText;
-              const correctText = 'No estimate or time spent';
+        it('should only show the "No time tracking" pane when both timeEstimate and time_spent are falsey', function(done) {
+          Vue.nextTick(() => {
+            const $noTrackingPane = this.timeTracker.$el.querySelector('.time-tracking-no-tracking-pane');
+            const noTrackingText =$noTrackingPane.innerText;
+            const correctText = 'No estimate or time spent';
 
-              expect(this.timeTracker.showNoTimeTrackingState).toBe(true);
-              expect($noTrackingPane).toBeVisible();
-              expect(noTrackingText).toBe(correctText);
-              done();
-            });
+            expect(this.timeTracker.showNoTimeTrackingState).toBe(true);
+            expect($noTrackingPane).toBeVisible();
+            expect(noTrackingText).toBe(correctText);
+            done();
           });
         });
+      });
 
-        describe("Help pane", function() {
-          beforeEach(function() {
-            initTimeTrackingComponent.call(this, { timeEstimate: 0, timeSpent: 0 });
-          });
+      describe("Help pane", function() {
+        beforeEach(function() {
+          initTimeTrackingComponent.call(this, { timeEstimate: 0, timeSpent: 0 });
+        });
 
-          it('should not show the "Help" pane by default', function(done) {
-            Vue.nextTick(() => {
-              const $helpPane = this.timeTracker.$el.querySelector('.time-tracking-help-state');
+        it('should not show the "Help" pane by default', function(done) {
+          Vue.nextTick(() => {
+            const $helpPane = this.timeTracker.$el.querySelector('.time-tracking-help-state');
 
-              expect(this.timeTracker.showHelpState).toBe(false);
-              expect($helpPane).toBeNull();
-              done();
-            });
+            expect(this.timeTracker.showHelpState).toBe(false);
+            expect($helpPane).toBeNull();
+            done();
           });
+        });
 
-          it('should show the "Help" pane when help button is clicked', function(done) {
-            Vue.nextTick(() => {
-              $(this.timeTracker.$el).find('.help-button').click();
+        it('should show the "Help" pane when help button is clicked', function(done) {
+          Vue.nextTick(() => {
+            $(this.timeTracker.$el).find('.help-button').click();
 
-              setTimeout(() => {
-                const $helpPane = this.timeTracker.$el.querySelector('.time-tracking-help-state');
-                expect(this.timeTracker.showHelpState).toBe(true);
-                expect($helpPane).toBeVisible();
-                done();
-              }, 10);
-            });
+            setTimeout(() => {
+              const $helpPane = this.timeTracker.$el.querySelector('.time-tracking-help-state');
+              expect(this.timeTracker.showHelpState).toBe(true);
+              expect($helpPane).toBeVisible();
+              done();
+            }, 10);
           });
+        });
 
-          it('should not show the "Help" pane when help button is clicked and then closed', function(done) {
-            Vue.nextTick(() => {
-              $(this.timeTracker.$el).find('.help-button').click();
+        it('should not show the "Help" pane when help button is clicked and then closed', function(done) {
+          Vue.nextTick(() => {
+            $(this.timeTracker.$el).find('.help-button').click();
 
-              setTimeout(() => {
+            setTimeout(() => {
 
-                $(this.timeTracker.$el).find('.close-help-button').click();
+              $(this.timeTracker.$el).find('.close-help-button').click();
 
-                setTimeout(() => {
-                  const $helpPane = this.timeTracker.$el.querySelector('.time-tracking-help-state');
+              setTimeout(() => {
+                const $helpPane = this.timeTracker.$el.querySelector('.time-tracking-help-state');
 
-                  expect(this.timeTracker.showHelpState).toBe(false);
-                  expect($helpPane).toBeNull();
+                expect(this.timeTracker.showHelpState).toBe(false);
+                expect($helpPane).toBeNull();
 
-                  done();
-                }, 1000);
+                done();
               }, 1000);
-            });
+            }, 1000);
           });
         });
       });
     });
   });
-})(window.gl || (window.gl = {}));
+});
diff --git a/spec/javascripts/issue_show/issue_title_description_spec.js b/spec/javascripts/issue_show/issue_title_description_spec.js
new file mode 100644
index 00000000000..1ec4fe58b08
--- /dev/null
+++ b/spec/javascripts/issue_show/issue_title_description_spec.js
@@ -0,0 +1,60 @@
+import Vue from 'vue';
+import $ from 'jquery';
+import '~/render_math';
+import '~/render_gfm';
+import issueTitleDescription from '~/issue_show/issue_title_description.vue';
+import issueShowData from './mock_data';
+
+window.$ = $;
+
+const issueShowInterceptor = data => (request, next) => {
+  next(request.respondWith(JSON.stringify(data), {
+    status: 200,
+    headers: {
+      'POLL-INTERVAL': 1,
+    },
+  }));
+};
+
+describe('Issue Title', () => {
+  document.body.innerHTML = '<span id="task_status"></span>';
+
+  let IssueTitleDescriptionComponent;
+
+  beforeEach(() => {
+    IssueTitleDescriptionComponent = Vue.extend(issueTitleDescription);
+  });
+
+  afterEach(() => {
+    Vue.http.interceptors = _.without(Vue.http.interceptors, issueShowInterceptor);
+  });
+
+  it('should render a title/description and update title/description on update', (done) => {
+    Vue.http.interceptors.push(issueShowInterceptor(issueShowData.initialRequest));
+
+    const issueShowComponent = new IssueTitleDescriptionComponent({
+      propsData: {
+        canUpdateIssue: '.css-stuff',
+        endpoint: '/gitlab-org/gitlab-shell/issues/9/rendered_title',
+      },
+    }).$mount();
+
+    setTimeout(() => {
+      expect(document.querySelector('title').innerText).toContain('this is a title (#1)');
+      expect(issueShowComponent.$el.querySelector('.title').innerHTML).toContain('<p>this is a title</p>');
+      expect(issueShowComponent.$el.querySelector('.wiki').innerHTML).toContain('<p>this is a description!</p>');
+      expect(issueShowComponent.$el.querySelector('.js-task-list-field').innerText).toContain('this is a description');
+
+      Vue.http.interceptors.push(issueShowInterceptor(issueShowData.secondRequest));
+
+      setTimeout(() => {
+        expect(document.querySelector('title').innerText).toContain('2 (#1)');
+        expect(issueShowComponent.$el.querySelector('.title').innerHTML).toContain('<p>2</p>');
+        expect(issueShowComponent.$el.querySelector('.wiki').innerHTML).toContain('<p>42</p>');
+        expect(issueShowComponent.$el.querySelector('.js-task-list-field').innerText).toContain('42');
+
+        done();
+      });
+    });
+  });
+});
diff --git a/spec/javascripts/issue_show/issue_title_spec.js b/spec/javascripts/issue_show/issue_title_spec.js
deleted file mode 100644
index 03edbf9f947..00000000000
--- a/spec/javascripts/issue_show/issue_title_spec.js
+++ /dev/null
@@ -1,22 +0,0 @@
-import Vue from 'vue';
-import issueTitle from '~/issue_show/issue_title.vue';
-
-describe('Issue Title', () => {
-  let IssueTitleComponent;
-
-  beforeEach(() => {
-    IssueTitleComponent = Vue.extend(issueTitle);
-  });
-
-  it('should render a title', () => {
-    const component = new IssueTitleComponent({
-      propsData: {
-        initialTitle: 'wow',
-        endpoint: '/gitlab-org/gitlab-shell/issues/9/rendered_title',
-      },
-    }).$mount();
-
-    expect(component.$el.classList).toContain('title');
-    expect(component.$el.innerHTML).toContain('wow');
-  });
-});
diff --git a/spec/javascripts/issue_show/mock_data.js b/spec/javascripts/issue_show/mock_data.js
new file mode 100644
index 00000000000..ad5a7b63470
--- /dev/null
+++ b/spec/javascripts/issue_show/mock_data.js
@@ -0,0 +1,26 @@
+export default {
+  initialRequest: {
+    title: '<p>this is a title</p>',
+    title_text: 'this is a title',
+    description: '<p>this is a description!</p>',
+    description_text: 'this is a description',
+    issue_number: 1,
+    task_status: '2 of 4 completed',
+  },
+  secondRequest: {
+    title: '<p>2</p>',
+    title_text: '2',
+    description: '<p>42</p>',
+    description_text: '42',
+    issue_number: 1,
+    task_status: '0 of 0 completed',
+  },
+  issueSpecRequest: {
+    title: '<p>this is a title</p>',
+    title_text: 'this is a title',
+    description: '<li class="task-list-item enabled"><input type="checkbox" class="task-list-item-checkbox">Task List Item</li>',
+    description_text: '- [ ] Task List Item',
+    issue_number: 1,
+    task_status: '0 of 1 completed',
+  },
+};
diff --git a/spec/javascripts/issue_spec.js b/spec/javascripts/issue_spec.js
index 0fd573eae3f..763f5ee9e50 100644
--- a/spec/javascripts/issue_spec.js
+++ b/spec/javascripts/issue_spec.js
@@ -81,12 +81,6 @@ describe('Issue', function() {
       this.issue = new Issue();
     });
 
-    it('modifies the Markdown field', function() {
-      spyOn(jQuery, 'ajax').and.stub();
-      $('input[type=checkbox]').attr('checked', true).trigger('change');
-      expect($('.js-task-list-field').val()).toBe('- [x] Task List Item');
-    });
-
     it('submits an ajax request on tasklist:changed', function() {
       spyOn(jQuery, 'ajax').and.callFake(function(req) {
         expect(req.type).toBe('PATCH');
diff --git a/spec/javascripts/lib/utils/accessor_spec.js b/spec/javascripts/lib/utils/accessor_spec.js
new file mode 100644
index 00000000000..b768d6f2a68
--- /dev/null
+++ b/spec/javascripts/lib/utils/accessor_spec.js
@@ -0,0 +1,78 @@
+import AccessorUtilities from '~/lib/utils/accessor';
+
+describe('AccessorUtilities', () => {
+  const testError = new Error('test error');
+
+  describe('isPropertyAccessSafe', () => {
+    let base;
+
+    it('should return `true` if access is safe', () => {
+      base = { testProp: 'testProp' };
+
+      expect(AccessorUtilities.isPropertyAccessSafe(base, 'testProp')).toBe(true);
+    });
+
+    it('should return `false` if access throws an error', () => {
+      base = { get testProp() { throw testError; } };
+
+      expect(AccessorUtilities.isPropertyAccessSafe(base, 'testProp')).toBe(false);
+    });
+
+    it('should return `false` if property is undefined', () => {
+      base = {};
+
+      expect(AccessorUtilities.isPropertyAccessSafe(base, 'testProp')).toBe(false);
+    });
+  });
+
+  describe('isFunctionCallSafe', () => {
+    const base = {};
+
+    it('should return `true` if calling is safe', () => {
+      base.func = () => {};
+
+      expect(AccessorUtilities.isFunctionCallSafe(base, 'func')).toBe(true);
+    });
+
+    it('should return `false` if calling throws an error', () => {
+      base.func = () => { throw new Error('test error'); };
+
+      expect(AccessorUtilities.isFunctionCallSafe(base, 'func')).toBe(false);
+    });
+
+    it('should return `false` if function is undefined', () => {
+      base.func = undefined;
+
+      expect(AccessorUtilities.isFunctionCallSafe(base, 'func')).toBe(false);
+    });
+  });
+
+  describe('isLocalStorageAccessSafe', () => {
+    beforeEach(() => {
+      spyOn(window.localStorage, 'setItem');
+      spyOn(window.localStorage, 'removeItem');
+    });
+
+    it('should return `true` if access is safe', () => {
+      expect(AccessorUtilities.isLocalStorageAccessSafe()).toBe(true);
+    });
+
+    it('should return `false` if access to .setItem isnt safe', () => {
+      window.localStorage.setItem.and.callFake(() => { throw testError; });
+
+      expect(AccessorUtilities.isLocalStorageAccessSafe()).toBe(false);
+    });
+
+    it('should set a test item if access is safe', () => {
+      AccessorUtilities.isLocalStorageAccessSafe();
+
+      expect(window.localStorage.setItem).toHaveBeenCalledWith('isLocalStorageAccessSafe', 'true');
+    });
+
+    it('should remove the test item if access is safe', () => {
+      AccessorUtilities.isLocalStorageAccessSafe();
+
+      expect(window.localStorage.removeItem).toHaveBeenCalledWith('isLocalStorageAccessSafe');
+    });
+  });
+});
diff --git a/spec/javascripts/lib/utils/ajax_cache_spec.js b/spec/javascripts/lib/utils/ajax_cache_spec.js
new file mode 100644
index 00000000000..7b466a11b92
--- /dev/null
+++ b/spec/javascripts/lib/utils/ajax_cache_spec.js
@@ -0,0 +1,129 @@
+import AjaxCache from '~/lib/utils/ajax_cache';
+
+describe('AjaxCache', () => {
+  const dummyEndpoint = '/AjaxCache/dummyEndpoint';
+  const dummyResponse = {
+    important: 'dummy data',
+  };
+  let ajaxSpy = (url) => {
+    expect(url).toBe(dummyEndpoint);
+    const deferred = $.Deferred();
+    deferred.resolve(dummyResponse);
+    return deferred.promise();
+  };
+
+  beforeEach(() => {
+    AjaxCache.internalStorage = { };
+    spyOn(jQuery, 'ajax').and.callFake(url => ajaxSpy(url));
+  });
+
+  describe('#get', () => {
+    it('returns undefined if cache is empty', () => {
+      const data = AjaxCache.get(dummyEndpoint);
+
+      expect(data).toBe(undefined);
+    });
+
+    it('returns undefined if cache contains no matching data', () => {
+      AjaxCache.internalStorage['not matching'] = dummyResponse;
+
+      const data = AjaxCache.get(dummyEndpoint);
+
+      expect(data).toBe(undefined);
+    });
+
+    it('returns matching data', () => {
+      AjaxCache.internalStorage[dummyEndpoint] = dummyResponse;
+
+      const data = AjaxCache.get(dummyEndpoint);
+
+      expect(data).toBe(dummyResponse);
+    });
+  });
+
+  describe('#hasData', () => {
+    it('returns false if cache is empty', () => {
+      expect(AjaxCache.hasData(dummyEndpoint)).toBe(false);
+    });
+
+    it('returns false if cache contains no matching data', () => {
+      AjaxCache.internalStorage['not matching'] = dummyResponse;
+
+      expect(AjaxCache.hasData(dummyEndpoint)).toBe(false);
+    });
+
+    it('returns true if data is available', () => {
+      AjaxCache.internalStorage[dummyEndpoint] = dummyResponse;
+
+      expect(AjaxCache.hasData(dummyEndpoint)).toBe(true);
+    });
+  });
+
+  describe('#purge', () => {
+    it('does nothing if cache is empty', () => {
+      AjaxCache.purge(dummyEndpoint);
+
+      expect(AjaxCache.internalStorage).toEqual({ });
+    });
+
+    it('does nothing if cache contains no matching data', () => {
+      AjaxCache.internalStorage['not matching'] = dummyResponse;
+
+      AjaxCache.purge(dummyEndpoint);
+
+      expect(AjaxCache.internalStorage['not matching']).toBe(dummyResponse);
+    });
+
+    it('removes matching data', () => {
+      AjaxCache.internalStorage[dummyEndpoint] = dummyResponse;
+
+      AjaxCache.purge(dummyEndpoint);
+
+      expect(AjaxCache.internalStorage).toEqual({ });
+    });
+  });
+
+  describe('#retrieve', () => {
+    it('stores and returns data from Ajax call if cache is empty', (done) => {
+      AjaxCache.retrieve(dummyEndpoint)
+      .then((data) => {
+        expect(data).toBe(dummyResponse);
+        expect(AjaxCache.internalStorage[dummyEndpoint]).toBe(dummyResponse);
+      })
+      .then(done)
+      .catch(fail);
+    });
+
+    it('returns undefined if Ajax call fails and cache is empty', (done) => {
+      const dummyStatusText = 'exploded';
+      const dummyErrorMessage = 'server exploded';
+      ajaxSpy = (url) => {
+        expect(url).toBe(dummyEndpoint);
+        const deferred = $.Deferred();
+        deferred.reject(null, dummyStatusText, dummyErrorMessage);
+        return deferred.promise();
+      };
+
+      AjaxCache.retrieve(dummyEndpoint)
+      .then(data => fail(`Received unexpected data: ${JSON.stringify(data)}`))
+      .catch((error) => {
+        expect(error.message).toBe(`${dummyEndpoint}: ${dummyErrorMessage}`);
+        expect(error.textStatus).toBe(dummyStatusText);
+        done();
+      })
+      .catch(fail);
+    });
+
+    it('makes no Ajax call if matching data exists', (done) => {
+      AjaxCache.internalStorage[dummyEndpoint] = dummyResponse;
+      ajaxSpy = () => fail(new Error('expected no Ajax call!'));
+
+      AjaxCache.retrieve(dummyEndpoint)
+      .then((data) => {
+        expect(data).toBe(dummyResponse);
+      })
+      .then(done)
+      .catch(fail);
+    });
+  });
+});
diff --git a/spec/javascripts/notes_spec.js b/spec/javascripts/notes_spec.js
index 7bffa90ab14..cfd599f793e 100644
--- a/spec/javascripts/notes_spec.js
+++ b/spec/javascripts/notes_spec.js
@@ -29,7 +29,7 @@ import '~/notes';
         $('.js-comment-button').on('click', function(e) {
           e.preventDefault();
         });
-        this.notes = new Notes();
+        this.notes = new Notes('', []);
       });
 
       it('modifies the Markdown field', function() {
@@ -51,7 +51,7 @@ import '~/notes';
       var textarea = '.js-note-text';
 
       beforeEach(function() {
-        this.notes = new Notes();
+        this.notes = new Notes('', []);
 
         this.autoSizeSpy = spyOnEvent($(textarea), 'autosize:update');
         spyOn(this.notes, 'renderNote').and.stub();
@@ -273,9 +273,92 @@ import '~/notes';
       });
     });
 
+    describe('postComment & updateComment', () => {
+      const sampleComment = 'foo';
+      const updatedComment = 'bar';
+      const note = {
+        id: 1234,
+        html: `<li class="note note-row-1234 timeline-entry" id="note_1234">
+                <div class="note-text">${sampleComment}</div>
+               </li>`,
+        note: sampleComment,
+        valid: true
+      };
+      let $form;
+      let $notesContainer;
+
+      beforeEach(() => {
+        this.notes = new Notes('', []);
+        window.gon.current_username = 'root';
+        window.gon.current_user_fullname = 'Administrator';
+        $form = $('form.js-main-target-form');
+        $notesContainer = $('ul.main-notes-list');
+        $form.find('textarea.js-note-text').val(sampleComment);
+      });
+
+      it('should show placeholder note while new comment is being posted', () => {
+        $('.js-comment-button').click();
+        expect($notesContainer.find('.note.being-posted').length > 0).toEqual(true);
+      });
+
+      it('should remove placeholder note when new comment is done posting', () => {
+        const deferred = $.Deferred();
+        spyOn($, 'ajax').and.returnValue(deferred.promise());
+        $('.js-comment-button').click();
+
+        deferred.resolve(note);
+        expect($notesContainer.find('.note.being-posted').length).toEqual(0);
+      });
+
+      it('should show actual note element when new comment is done posting', () => {
+        const deferred = $.Deferred();
+        spyOn($, 'ajax').and.returnValue(deferred.promise());
+        $('.js-comment-button').click();
+
+        deferred.resolve(note);
+        expect($notesContainer.find(`#note_${note.id}`).length > 0).toEqual(true);
+      });
+
+      it('should reset Form when new comment is done posting', () => {
+        const deferred = $.Deferred();
+        spyOn($, 'ajax').and.returnValue(deferred.promise());
+        $('.js-comment-button').click();
+
+        deferred.resolve(note);
+        expect($form.find('textarea.js-note-text').val()).toEqual('');
+      });
+
+      it('should show flash error message when new comment failed to be posted', () => {
+        const deferred = $.Deferred();
+        spyOn($, 'ajax').and.returnValue(deferred.promise());
+        $('.js-comment-button').click();
+
+        deferred.reject();
+        expect($notesContainer.parent().find('.flash-container .flash-text').is(':visible')).toEqual(true);
+      });
+
+      it('should show flash error message when comment failed to be updated', () => {
+        const deferred = $.Deferred();
+        spyOn($, 'ajax').and.returnValue(deferred.promise());
+        $('.js-comment-button').click();
+
+        deferred.resolve(note);
+        const $noteEl = $notesContainer.find(`#note_${note.id}`);
+        $noteEl.find('.js-note-edit').click();
+        $noteEl.find('textarea.js-note-text').val(updatedComment);
+        $noteEl.find('.js-comment-save-button').click();
+
+        deferred.reject();
+        const $updatedNoteEl = $notesContainer.find(`#note_${note.id}`);
+        expect($updatedNoteEl.hasClass('.being-posted')).toEqual(false); // Remove being-posted visuals
+        expect($updatedNoteEl.find('.note-text').text().trim()).toEqual(sampleComment); // See if comment reverted back to original
+        expect($('.flash-container').is(':visible')).toEqual(true); // Flash error message shown
+      });
+    });
+
     describe('getFormData', () => {
       it('should return form metadata object from form reference', () => {
-        this.notes = new Notes();
+        this.notes = new Notes('', []);
 
         const $form = $('form');
         const sampleComment = 'foobar';
@@ -290,7 +373,7 @@ import '~/notes';
 
     describe('hasSlashCommands', () => {
       beforeEach(() => {
-        this.notes = new Notes();
+        this.notes = new Notes('', []);
       });
 
       it('should return true when comment has slash commands', () => {
@@ -327,7 +410,7 @@ import '~/notes';
       const currentUserFullname = 'Administrator';
 
       beforeEach(() => {
-        this.notes = new Notes();
+        this.notes = new Notes('', []);
       });
 
       it('should return constructed placeholder element for regular note based on form contents', () => {
@@ -364,129 +447,5 @@ import '~/notes';
         expect($tempNote.find('.timeline-content').hasClass('discussion')).toBeTruthy();
       });
     });
-
-    describe('postComment & updateComment', () => {
-      const sampleComment = 'foo';
-      const updatedComment = 'bar';
-      const note = {
-        id: 1234,
-        html: `<li class="note note-row-1234 timeline-entry" id="note_1234">
-                <div class="note-text">${sampleComment}</div>
-               </li>`,
-        note: sampleComment,
-        valid: true
-      };
-      let $form;
-      let $notesContainer;
-
-      beforeEach(() => {
-        this.notes = new Notes();
-        window.gon.current_username = 'root';
-        window.gon.current_user_fullname = 'Administrator';
-        $form = $('form');
-        $notesContainer = $('ul.main-notes-list');
-        $form.find('textarea.js-note-text').val(sampleComment);
-        $('.js-comment-button').click();
-      });
-
-      it('should show placeholder note while new comment is being posted', () => {
-        expect($notesContainer.find('.note.being-posted').length > 0).toEqual(true);
-      });
-
-      it('should remove placeholder note when new comment is done posting', () => {
-        spyOn($, 'ajax').and.callFake((options) => {
-          options.success(note);
-          expect($notesContainer.find('.note.being-posted').length).toEqual(0);
-        });
-      });
-
-      it('should show actual note element when new comment is done posting', () => {
-        spyOn($, 'ajax').and.callFake((options) => {
-          options.success(note);
-          expect($notesContainer.find(`#${note.id}`).length > 0).toEqual(true);
-        });
-      });
-
-      it('should reset Form when new comment is done posting', () => {
-        spyOn($, 'ajax').and.callFake((options) => {
-          options.success(note);
-          expect($form.find('textarea.js-note-text')).toEqual('');
-        });
-      });
-
-      it('should trigger ajax:success event on Form when new comment is done posting', () => {
-        spyOn($, 'ajax').and.callFake((options) => {
-          options.success(note);
-          spyOn($form, 'trigger');
-          expect($form.trigger).toHaveBeenCalledWith('ajax:success', [note]);
-        });
-      });
-
-      it('should show flash error message when new comment failed to be posted', () => {
-        spyOn($, 'ajax').and.callFake((options) => {
-          options.error();
-          expect($notesContainer.parent().find('.flash-container .flash-text').is(':visible')).toEqual(true);
-        });
-      });
-
-      it('should refill form textarea with original comment content when new comment failed to be posted', () => {
-        spyOn($, 'ajax').and.callFake((options) => {
-          options.error();
-          expect($form.find('textarea.js-note-text')).toEqual(sampleComment);
-        });
-      });
-
-      it('should show updated comment as _actively being posted_ while comment being updated', () => {
-        spyOn($, 'ajax').and.callFake((options) => {
-          options.success(note);
-          const $noteEl = $notesContainer.find(`#note_${note.id}`);
-          $noteEl.find('.js-note-edit').click();
-          $noteEl.find('textarea.js-note-text').val(updatedComment);
-          $noteEl.find('.js-comment-save-button').click();
-          expect($noteEl.hasClass('.being-posted')).toEqual(true);
-          expect($noteEl.find('.note-text').text()).toEqual(updatedComment);
-        });
-      });
-
-      it('should show updated comment when comment update is done posting', () => {
-        spyOn($, 'ajax').and.callFake((options) => {
-          options.success(note);
-          const $noteEl = $notesContainer.find(`#note_${note.id}`);
-          $noteEl.find('.js-note-edit').click();
-          $noteEl.find('textarea.js-note-text').val(updatedComment);
-          $noteEl.find('.js-comment-save-button').click();
-
-          spyOn($, 'ajax').and.callFake((updateOptions) => {
-            const updatedNote = Object.assign({}, note);
-            updatedNote.note = updatedComment;
-            updatedNote.html = `<li class="note note-row-1234 timeline-entry" id="note_1234">
-                                  <div class="note-text">${updatedComment}</div>
-                                </li>`;
-            updateOptions.success(updatedNote);
-            const $updatedNoteEl = $notesContainer.find(`#note_${updatedNote.id}`);
-            expect($updatedNoteEl.hasClass('.being-posted')).toEqual(false); // Remove being-posted visuals
-            expect($updatedNoteEl.find('note-text').text().trim()).toEqual(updatedComment); // Verify if comment text updated
-          });
-        });
-      });
-
-      it('should show flash error message when comment failed to be updated', () => {
-        spyOn($, 'ajax').and.callFake((options) => {
-          options.success(note);
-          const $noteEl = $notesContainer.find(`#note_${note.id}`);
-          $noteEl.find('.js-note-edit').click();
-          $noteEl.find('textarea.js-note-text').val(updatedComment);
-          $noteEl.find('.js-comment-save-button').click();
-
-          spyOn($, 'ajax').and.callFake((updateOptions) => {
-            updateOptions.error();
-            const $updatedNoteEl = $notesContainer.find(`#note_${note.id}`);
-            expect($updatedNoteEl.hasClass('.being-posted')).toEqual(false); // Remove being-posted visuals
-            expect($updatedNoteEl.find('note-text').text().trim()).toEqual(sampleComment); // See if comment reverted back to original
-            expect($notesContainer.parent().find('.flash-container .flash-text').is(':visible')).toEqual(true); // Flash error message shown
-          });
-        });
-      });
-    });
   });
 }).call(window);
diff --git a/spec/javascripts/raven/index_spec.js b/spec/javascripts/raven/index_spec.js
new file mode 100644
index 00000000000..b5662cd0331
--- /dev/null
+++ b/spec/javascripts/raven/index_spec.js
@@ -0,0 +1,42 @@
+import RavenConfig from '~/raven/raven_config';
+import index from '~/raven/index';
+
+describe('RavenConfig options', () => {
+  let sentryDsn;
+  let currentUserId;
+  let gitlabUrl;
+  let isProduction;
+  let indexReturnValue;
+
+  beforeEach(() => {
+    sentryDsn = 'sentryDsn';
+    currentUserId = 'currentUserId';
+    gitlabUrl = 'gitlabUrl';
+    isProduction = 'isProduction';
+
+    window.gon = {
+      sentry_dsn: sentryDsn,
+      current_user_id: currentUserId,
+      gitlab_url: gitlabUrl,
+    };
+
+    process.env.NODE_ENV = isProduction;
+
+    spyOn(RavenConfig, 'init');
+
+    indexReturnValue = index();
+  });
+
+  it('should init with .sentryDsn, .currentUserId, .whitelistUrls and .isProduction', () => {
+    expect(RavenConfig.init).toHaveBeenCalledWith({
+      sentryDsn,
+      currentUserId,
+      whitelistUrls: [gitlabUrl],
+      isProduction,
+    });
+  });
+
+  it('should return RavenConfig', () => {
+    expect(indexReturnValue).toBe(RavenConfig);
+  });
+});
diff --git a/spec/javascripts/raven/raven_config_spec.js b/spec/javascripts/raven/raven_config_spec.js
new file mode 100644
index 00000000000..a2d720760fc
--- /dev/null
+++ b/spec/javascripts/raven/raven_config_spec.js
@@ -0,0 +1,276 @@
+import Raven from 'raven-js';
+import RavenConfig from '~/raven/raven_config';
+
+describe('RavenConfig', () => {
+  describe('IGNORE_ERRORS', () => {
+    it('should be an array of strings', () => {
+      const areStrings = RavenConfig.IGNORE_ERRORS.every(error => typeof error === 'string');
+
+      expect(areStrings).toBe(true);
+    });
+  });
+
+  describe('IGNORE_URLS', () => {
+    it('should be an array of regexps', () => {
+      const areRegExps = RavenConfig.IGNORE_URLS.every(url => url instanceof RegExp);
+
+      expect(areRegExps).toBe(true);
+    });
+  });
+
+  describe('SAMPLE_RATE', () => {
+    it('should be a finite number', () => {
+      expect(typeof RavenConfig.SAMPLE_RATE).toEqual('number');
+    });
+  });
+
+  describe('init', () => {
+    let options;
+
+    beforeEach(() => {
+      options = {
+        sentryDsn: '//sentryDsn',
+        ravenAssetUrl: '//ravenAssetUrl',
+        currentUserId: 1,
+        whitelistUrls: ['//gitlabUrl'],
+        isProduction: true,
+      };
+
+      spyOn(RavenConfig, 'configure');
+      spyOn(RavenConfig, 'bindRavenErrors');
+      spyOn(RavenConfig, 'setUser');
+
+      RavenConfig.init(options);
+    });
+
+    it('should set the options property', () => {
+      expect(RavenConfig.options).toEqual(options);
+    });
+
+    it('should call the configure method', () => {
+      expect(RavenConfig.configure).toHaveBeenCalled();
+    });
+
+    it('should call the error bindings method', () => {
+      expect(RavenConfig.bindRavenErrors).toHaveBeenCalled();
+    });
+
+    it('should call setUser', () => {
+      expect(RavenConfig.setUser).toHaveBeenCalled();
+    });
+
+    it('should not call setUser if there is no current user ID', () => {
+      RavenConfig.setUser.calls.reset();
+
+      RavenConfig.init({
+        sentryDsn: '//sentryDsn',
+        ravenAssetUrl: '//ravenAssetUrl',
+        currentUserId: undefined,
+        whitelistUrls: ['//gitlabUrl'],
+        isProduction: true,
+      });
+
+      expect(RavenConfig.setUser).not.toHaveBeenCalled();
+    });
+  });
+
+  describe('configure', () => {
+    let options;
+    let raven;
+    let ravenConfig;
+
+    beforeEach(() => {
+      options = {
+        sentryDsn: '//sentryDsn',
+        whitelistUrls: ['//gitlabUrl'],
+        isProduction: true,
+      };
+
+      ravenConfig = jasmine.createSpyObj('ravenConfig', ['shouldSendSample']);
+      raven = jasmine.createSpyObj('raven', ['install']);
+
+      spyOn(Raven, 'config').and.returnValue(raven);
+
+      ravenConfig.options = options;
+      ravenConfig.IGNORE_ERRORS = 'ignore_errors';
+      ravenConfig.IGNORE_URLS = 'ignore_urls';
+
+      RavenConfig.configure.call(ravenConfig);
+    });
+
+    it('should call Raven.config', () => {
+      expect(Raven.config).toHaveBeenCalledWith(options.sentryDsn, {
+        whitelistUrls: options.whitelistUrls,
+        environment: 'production',
+        ignoreErrors: ravenConfig.IGNORE_ERRORS,
+        ignoreUrls: ravenConfig.IGNORE_URLS,
+        shouldSendCallback: jasmine.any(Function),
+      });
+    });
+
+    it('should call Raven.install', () => {
+      expect(raven.install).toHaveBeenCalled();
+    });
+
+    it('should set .environment to development if isProduction is false', () => {
+      ravenConfig.options.isProduction = false;
+
+      RavenConfig.configure.call(ravenConfig);
+
+      expect(Raven.config).toHaveBeenCalledWith(options.sentryDsn, {
+        whitelistUrls: options.whitelistUrls,
+        environment: 'development',
+        ignoreErrors: ravenConfig.IGNORE_ERRORS,
+        ignoreUrls: ravenConfig.IGNORE_URLS,
+        shouldSendCallback: jasmine.any(Function),
+      });
+    });
+  });
+
+  describe('setUser', () => {
+    let ravenConfig;
+
+    beforeEach(() => {
+      ravenConfig = { options: { currentUserId: 1 } };
+      spyOn(Raven, 'setUserContext');
+
+      RavenConfig.setUser.call(ravenConfig);
+    });
+
+    it('should call .setUserContext', function () {
+      expect(Raven.setUserContext).toHaveBeenCalledWith({
+        id: ravenConfig.options.currentUserId,
+      });
+    });
+  });
+
+  describe('bindRavenErrors', () => {
+    let $document;
+    let $;
+
+    beforeEach(() => {
+      $document = jasmine.createSpyObj('$document', ['on']);
+      $ = jasmine.createSpy('$').and.returnValue($document);
+
+      window.$ = $;
+
+      RavenConfig.bindRavenErrors();
+    });
+
+    it('should call .on', function () {
+      expect($document.on).toHaveBeenCalledWith('ajaxError.raven', RavenConfig.handleRavenErrors);
+    });
+  });
+
+  describe('handleRavenErrors', () => {
+    let event;
+    let req;
+    let config;
+    let err;
+
+    beforeEach(() => {
+      event = {};
+      req = { status: 'status', responseText: 'responseText', statusText: 'statusText' };
+      config = { type: 'type', url: 'url', data: 'data' };
+      err = {};
+
+      spyOn(Raven, 'captureMessage');
+
+      RavenConfig.handleRavenErrors(event, req, config, err);
+    });
+
+    it('should call Raven.captureMessage', () => {
+      expect(Raven.captureMessage).toHaveBeenCalledWith(err, {
+        extra: {
+          type: config.type,
+          url: config.url,
+          data: config.data,
+          status: req.status,
+          response: req.responseText,
+          error: err,
+          event,
+        },
+      });
+    });
+
+    describe('if no err is provided', () => {
+      beforeEach(() => {
+        Raven.captureMessage.calls.reset();
+
+        RavenConfig.handleRavenErrors(event, req, config);
+      });
+
+      it('should use req.statusText as the error value', () => {
+        expect(Raven.captureMessage).toHaveBeenCalledWith(req.statusText, {
+          extra: {
+            type: config.type,
+            url: config.url,
+            data: config.data,
+            status: req.status,
+            response: req.responseText,
+            error: req.statusText,
+            event,
+          },
+        });
+      });
+    });
+
+    describe('if no req.responseText is provided', () => {
+      beforeEach(() => {
+        req.responseText = undefined;
+
+        Raven.captureMessage.calls.reset();
+
+        RavenConfig.handleRavenErrors(event, req, config, err);
+      });
+
+      it('should use `Unknown response text` as the response', () => {
+        expect(Raven.captureMessage).toHaveBeenCalledWith(err, {
+          extra: {
+            type: config.type,
+            url: config.url,
+            data: config.data,
+            status: req.status,
+            response: 'Unknown response text',
+            error: err,
+            event,
+          },
+        });
+      });
+    });
+  });
+
+  describe('shouldSendSample', () => {
+    let randomNumber;
+
+    beforeEach(() => {
+      RavenConfig.SAMPLE_RATE = 50;
+
+      spyOn(Math, 'random').and.callFake(() => randomNumber);
+    });
+
+    it('should call Math.random', () => {
+      RavenConfig.shouldSendSample();
+
+      expect(Math.random).toHaveBeenCalled();
+    });
+
+    it('should return true if the sample rate is greater than the random number * 100', () => {
+      randomNumber = 0.1;
+
+      expect(RavenConfig.shouldSendSample()).toBe(true);
+    });
+
+    it('should return false if the sample rate is less than the random number * 100', () => {
+      randomNumber = 0.9;
+
+      expect(RavenConfig.shouldSendSample()).toBe(false);
+    });
+
+    it('should return true if the sample rate is equal to the random number * 100', () => {
+      randomNumber = 0.5;
+
+      expect(RavenConfig.shouldSendSample()).toBe(true);
+    });
+  });
+});
diff --git a/spec/javascripts/sidebar/assignee_title_spec.js b/spec/javascripts/sidebar/assignee_title_spec.js
new file mode 100644
index 00000000000..5b5b1bf4140
--- /dev/null
+++ b/spec/javascripts/sidebar/assignee_title_spec.js
@@ -0,0 +1,80 @@
+import Vue from 'vue';
+import AssigneeTitle from '~/sidebar/components/assignees/assignee_title';
+
+describe('AssigneeTitle component', () => {
+  let component;
+  let AssigneeTitleComponent;
+
+  beforeEach(() => {
+    AssigneeTitleComponent = Vue.extend(AssigneeTitle);
+  });
+
+  describe('assignee title', () => {
+    it('renders assignee', () => {
+      component = new AssigneeTitleComponent({
+        propsData: {
+          numberOfAssignees: 1,
+          editable: false,
+        },
+      }).$mount();
+
+      expect(component.$el.innerText.trim()).toEqual('Assignee');
+    });
+
+    it('renders 2 assignees', () => {
+      component = new AssigneeTitleComponent({
+        propsData: {
+          numberOfAssignees: 2,
+          editable: false,
+        },
+      }).$mount();
+
+      expect(component.$el.innerText.trim()).toEqual('2 Assignees');
+    });
+  });
+
+  it('does not render spinner by default', () => {
+    component = new AssigneeTitleComponent({
+      propsData: {
+        numberOfAssignees: 0,
+        editable: false,
+      },
+    }).$mount();
+
+    expect(component.$el.querySelector('.fa')).toBeNull();
+  });
+
+  it('renders spinner when loading', () => {
+    component = new AssigneeTitleComponent({
+      propsData: {
+        loading: true,
+        numberOfAssignees: 0,
+        editable: false,
+      },
+    }).$mount();
+
+    expect(component.$el.querySelector('.fa')).not.toBeNull();
+  });
+
+  it('does not render edit link when not editable', () => {
+    component = new AssigneeTitleComponent({
+      propsData: {
+        numberOfAssignees: 0,
+        editable: false,
+      },
+    }).$mount();
+
+    expect(component.$el.querySelector('.edit-link')).toBeNull();
+  });
+
+  it('renders edit link when editable', () => {
+    component = new AssigneeTitleComponent({
+      propsData: {
+        numberOfAssignees: 0,
+        editable: true,
+      },
+    }).$mount();
+
+    expect(component.$el.querySelector('.edit-link')).not.toBeNull();
+  });
+});
diff --git a/spec/javascripts/sidebar/assignees_spec.js b/spec/javascripts/sidebar/assignees_spec.js
new file mode 100644
index 00000000000..c9453a21189
--- /dev/null
+++ b/spec/javascripts/sidebar/assignees_spec.js
@@ -0,0 +1,272 @@
+import Vue from 'vue';
+import Assignee from '~/sidebar/components/assignees/assignees';
+import UsersMock from './mock_data';
+import UsersMockHelper from '../helpers/user_mock_data_helper';
+
+describe('Assignee component', () => {
+  let component;
+  let AssigneeComponent;
+
+  beforeEach(() => {
+    AssigneeComponent = Vue.extend(Assignee);
+  });
+
+  describe('No assignees/users', () => {
+    it('displays no assignee icon when collapsed', () => {
+      component = new AssigneeComponent({
+        propsData: {
+          rootPath: 'http://localhost:3000',
+          users: [],
+          editable: false,
+        },
+      }).$mount();
+
+      const collapsed = component.$el.querySelector('.sidebar-collapsed-icon');
+      expect(collapsed.childElementCount).toEqual(1);
+      expect(collapsed.children[0].getAttribute('aria-label')).toEqual('No Assignee');
+      expect(collapsed.children[0].classList.contains('fa')).toEqual(true);
+      expect(collapsed.children[0].classList.contains('fa-user')).toEqual(true);
+    });
+
+    it('displays only "No assignee" when no users are assigned and the issue is read-only', () => {
+      component = new AssigneeComponent({
+        propsData: {
+          rootPath: 'http://localhost:3000',
+          users: [],
+          editable: false,
+        },
+      }).$mount();
+      const componentTextNoUsers = component.$el.querySelector('.assign-yourself').innerText.trim();
+
+      expect(componentTextNoUsers).toBe('No assignee');
+      expect(componentTextNoUsers.indexOf('assign yourself')).toEqual(-1);
+    });
+
+    it('displays only "No assignee" when no users are assigned and the issue can be edited', () => {
+      component = new AssigneeComponent({
+        propsData: {
+          rootPath: 'http://localhost:3000',
+          users: [],
+          editable: true,
+        },
+      }).$mount();
+      const componentTextNoUsers = component.$el.querySelector('.assign-yourself').innerText.trim();
+
+      expect(componentTextNoUsers.indexOf('No assignee')).toEqual(0);
+      expect(componentTextNoUsers.indexOf('assign yourself')).toBeGreaterThan(0);
+    });
+
+    it('emits the assign-self event when "assign yourself" is clicked', () => {
+      component = new AssigneeComponent({
+        propsData: {
+          rootPath: 'http://localhost:3000',
+          users: [],
+          editable: true,
+        },
+      }).$mount();
+
+      spyOn(component, '$emit');
+      component.$el.querySelector('.assign-yourself .btn-link').click();
+      expect(component.$emit).toHaveBeenCalledWith('assign-self');
+    });
+  });
+
+  describe('One assignee/user', () => {
+    it('displays one assignee icon when collapsed', () => {
+      component = new AssigneeComponent({
+        propsData: {
+          rootPath: 'http://localhost:3000',
+          users: [
+            UsersMock.user,
+          ],
+          editable: false,
+        },
+      }).$mount();
+
+      const collapsed = component.$el.querySelector('.sidebar-collapsed-icon');
+      const assignee = collapsed.children[0];
+      expect(collapsed.childElementCount).toEqual(1);
+      expect(assignee.querySelector('.avatar').getAttribute('src')).toEqual(UsersMock.user.avatar);
+      expect(assignee.querySelector('.avatar').getAttribute('alt')).toEqual(`${UsersMock.user.name}'s avatar`);
+      expect(assignee.querySelector('.author').innerText.trim()).toEqual(UsersMock.user.name);
+    });
+
+    it('Shows one user with avatar, username and author name', () => {
+      component = new AssigneeComponent({
+        propsData: {
+          rootPath: 'http://localhost:3000/',
+          users: [
+            UsersMock.user,
+          ],
+          editable: true,
+        },
+      }).$mount();
+
+      expect(component.$el.querySelector('.author_link')).not.toBeNull();
+      // The image
+      expect(component.$el.querySelector('.author_link img').getAttribute('src')).toEqual(UsersMock.user.avatar);
+      // Author name
+      expect(component.$el.querySelector('.author_link .author').innerText.trim()).toEqual(UsersMock.user.name);
+      // Username
+      expect(component.$el.querySelector('.author_link .username').innerText.trim()).toEqual(`@${UsersMock.user.username}`);
+    });
+
+    it('has the root url present in the assigneeUrl method', () => {
+      component = new AssigneeComponent({
+        propsData: {
+          rootPath: 'http://localhost:3000/',
+          users: [
+            UsersMock.user,
+          ],
+          editable: true,
+        },
+      }).$mount();
+
+      expect(component.assigneeUrl(UsersMock.user).indexOf('http://localhost:3000/')).not.toEqual(-1);
+    });
+  });
+
+  describe('Two or more assignees/users', () => {
+    it('displays two assignee icons when collapsed', () => {
+      const users = UsersMockHelper.createNumberRandomUsers(2);
+      component = new AssigneeComponent({
+        propsData: {
+          rootPath: 'http://localhost:3000',
+          users,
+          editable: false,
+        },
+      }).$mount();
+
+      const collapsed = component.$el.querySelector('.sidebar-collapsed-icon');
+      expect(collapsed.childElementCount).toEqual(2);
+
+      const first = collapsed.children[0];
+      expect(first.querySelector('.avatar').getAttribute('src')).toEqual(users[0].avatar);
+      expect(first.querySelector('.avatar').getAttribute('alt')).toEqual(`${users[0].name}'s avatar`);
+      expect(first.querySelector('.author').innerText.trim()).toEqual(users[0].name);
+
+      const second = collapsed.children[1];
+      expect(second.querySelector('.avatar').getAttribute('src')).toEqual(users[1].avatar);
+      expect(second.querySelector('.avatar').getAttribute('alt')).toEqual(`${users[1].name}'s avatar`);
+      expect(second.querySelector('.author').innerText.trim()).toEqual(users[1].name);
+    });
+
+    it('displays one assignee icon and counter when collapsed', () => {
+      const users = UsersMockHelper.createNumberRandomUsers(3);
+      component = new AssigneeComponent({
+        propsData: {
+          rootPath: 'http://localhost:3000',
+          users,
+          editable: false,
+        },
+      }).$mount();
+
+      const collapsed = component.$el.querySelector('.sidebar-collapsed-icon');
+      expect(collapsed.childElementCount).toEqual(2);
+
+      const first = collapsed.children[0];
+      expect(first.querySelector('.avatar').getAttribute('src')).toEqual(users[0].avatar);
+      expect(first.querySelector('.avatar').getAttribute('alt')).toEqual(`${users[0].name}'s avatar`);
+      expect(first.querySelector('.author').innerText.trim()).toEqual(users[0].name);
+
+      const second = collapsed.children[1];
+      expect(second.querySelector('.avatar-counter').innerText.trim()).toEqual('+2');
+    });
+
+    it('Shows two assignees', () => {
+      const users = UsersMockHelper.createNumberRandomUsers(2);
+      component = new AssigneeComponent({
+        propsData: {
+          rootPath: 'http://localhost:3000',
+          users,
+          editable: true,
+        },
+      }).$mount();
+
+      expect(component.$el.querySelectorAll('.user-item').length).toEqual(users.length);
+      expect(component.$el.querySelector('.user-list-more')).toBe(null);
+    });
+
+    it('Shows the "show-less" assignees label', (done) => {
+      const users = UsersMockHelper.createNumberRandomUsers(6);
+      component = new AssigneeComponent({
+        propsData: {
+          rootPath: 'http://localhost:3000',
+          users,
+          editable: true,
+        },
+      }).$mount();
+
+      expect(component.$el.querySelectorAll('.user-item').length).toEqual(component.defaultRenderCount);
+      expect(component.$el.querySelector('.user-list-more')).not.toBe(null);
+      const usersLabelExpectation = users.length - component.defaultRenderCount;
+      expect(component.$el.querySelector('.user-list-more .btn-link').innerText.trim())
+        .not.toBe(`+${usersLabelExpectation} more`);
+      component.toggleShowLess();
+      Vue.nextTick(() => {
+        expect(component.$el.querySelector('.user-list-more .btn-link').innerText.trim())
+          .toBe('- show less');
+        done();
+      });
+    });
+
+    it('Shows the "show-less" when "n+ more " label is clicked', (done) => {
+      const users = UsersMockHelper.createNumberRandomUsers(6);
+      component = new AssigneeComponent({
+        propsData: {
+          rootPath: 'http://localhost:3000',
+          users,
+          editable: true,
+        },
+      }).$mount();
+
+      component.$el.querySelector('.user-list-more .btn-link').click();
+      Vue.nextTick(() => {
+        expect(component.$el.querySelector('.user-list-more .btn-link').innerText.trim())
+          .toBe('- show less');
+        done();
+      });
+    });
+
+    it('gets the count of avatar via a computed property ', () => {
+      const users = UsersMockHelper.createNumberRandomUsers(6);
+      component = new AssigneeComponent({
+        propsData: {
+          rootPath: 'http://localhost:3000',
+          users,
+          editable: true,
+        },
+      }).$mount();
+
+      expect(component.sidebarAvatarCounter).toEqual(`+${users.length - 1}`);
+    });
+
+    describe('n+ more label', () => {
+      beforeEach(() => {
+        const users = UsersMockHelper.createNumberRandomUsers(6);
+        component = new AssigneeComponent({
+          propsData: {
+            rootPath: 'http://localhost:3000',
+            users,
+            editable: true,
+          },
+        }).$mount();
+      });
+
+      it('shows "+1 more" label', () => {
+        expect(component.$el.querySelector('.user-list-more .btn-link').innerText.trim())
+          .toBe('+ 1 more');
+      });
+
+      it('shows "show less" label', (done) => {
+        component.toggleShowLess();
+
+        Vue.nextTick(() => {
+          expect(component.$el.querySelector('.user-list-more .btn-link').innerText.trim())
+            .toBe('- show less');
+          done();
+        });
+      });
+    });
+  });
+});
diff --git a/spec/javascripts/sidebar/mock_data.js b/spec/javascripts/sidebar/mock_data.js
new file mode 100644
index 00000000000..9fc8667ecc9
--- /dev/null
+++ b/spec/javascripts/sidebar/mock_data.js
@@ -0,0 +1,109 @@
+/* eslint-disable quote-props*/
+
+const sidebarMockData = {
+  'GET': {
+    '/gitlab-org/gitlab-shell/issues/5.json': {
+      id: 45,
+      iid: 5,
+      author_id: 23,
+      description: 'Nulla ullam commodi delectus adipisci quis sit.',
+      lock_version: null,
+      milestone_id: 21,
+      position: 0,
+      state: 'closed',
+      title: 'Vel et nulla voluptatibus corporis dolor iste saepe laborum.',
+      updated_by_id: 1,
+      created_at: '2017-02-02T21: 49: 49.664Z',
+      updated_at: '2017-05-03T22: 26: 03.760Z',
+      deleted_at: null,
+      time_estimate: 0,
+      total_time_spent: 0,
+      human_time_estimate: null,
+      human_total_time_spent: null,
+      branch_name: null,
+      confidential: false,
+      assignees: [
+        {
+          name: 'User 0',
+          username: 'user0',
+          id: 22,
+          state: 'active',
+          avatar_url: 'http: //www.gravatar.com/avatar/52e4ce24a915fb7e51e1ad3b57f4b00a?s=80\u0026d=identicon',
+          web_url: 'http: //localhost:3001/user0',
+        },
+        {
+          name: 'Marguerite Bartell',
+          username: 'tajuana',
+          id: 18,
+          state: 'active',
+          avatar_url: 'http: //www.gravatar.com/avatar/4852a41fb41616bf8f140d3701673f53?s=80\u0026d=identicon',
+          web_url: 'http: //localhost:3001/tajuana',
+        },
+        {
+          name: 'Laureen Ritchie',
+          username: 'michaele.will',
+          id: 16,
+          state: 'active',
+          avatar_url: 'http: //www.gravatar.com/avatar/e301827eb03be955c9c172cb9a8e4e8a?s=80\u0026d=identicon',
+          web_url: 'http: //localhost:3001/michaele.will',
+        },
+      ],
+      due_date: null,
+      moved_to_id: null,
+      project_id: 4,
+      weight: null,
+      milestone: {
+        id: 21,
+        iid: 1,
+        project_id: 4,
+        title: 'v0.0',
+        description: 'Molestiae commodi laboriosam odio sunt eaque reprehenderit.',
+        state: 'active',
+        created_at: '2017-02-02T21: 49: 30.530Z',
+        updated_at: '2017-02-02T21: 49: 30.530Z',
+        due_date: null,
+        start_date: null,
+      },
+      labels: [],
+    },
+  },
+  'PUT': {
+    '/gitlab-org/gitlab-shell/issues/5.json': {
+      data: {},
+    },
+  },
+};
+
+export default {
+  mediator: {
+    endpoint: '/gitlab-org/gitlab-shell/issues/5.json',
+    editable: true,
+    currentUser: {
+      id: 1,
+      name: 'Administrator',
+      username: 'root',
+      avatar_url: 'http://www.gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80&d=identicon',
+    },
+    rootPath: '/',
+  },
+  time: {
+    time_estimate: 3600,
+    total_time_spent: 0,
+    human_time_estimate: '1h',
+    human_total_time_spent: null,
+  },
+  user: {
+    avatar: 'http://gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80&d=identicon',
+    id: 1,
+    name: 'Administrator',
+    username: 'root',
+  },
+
+  sidebarMockInterceptor(request, next) {
+    const body = sidebarMockData[request.method.toUpperCase()][request.url];
+
+    next(request.respondWith(JSON.stringify(body), {
+      status: 200,
+    }));
+  },
+};
diff --git a/spec/javascripts/sidebar/sidebar_assignees_spec.js b/spec/javascripts/sidebar/sidebar_assignees_spec.js
new file mode 100644
index 00000000000..e0df0a3228f
--- /dev/null
+++ b/spec/javascripts/sidebar/sidebar_assignees_spec.js
@@ -0,0 +1,45 @@
+import Vue from 'vue';
+import SidebarAssignees from '~/sidebar/components/assignees/sidebar_assignees';
+import SidebarMediator from '~/sidebar/sidebar_mediator';
+import SidebarService from '~/sidebar/services/sidebar_service';
+import SidebarStore from '~/sidebar/stores/sidebar_store';
+import Mock from './mock_data';
+
+describe('sidebar assignees', () => {
+  let component;
+  let SidebarAssigneeComponent;
+  preloadFixtures('issues/open-issue.html.raw');
+
+  beforeEach(() => {
+    Vue.http.interceptors.push(Mock.sidebarMockInterceptor);
+    SidebarAssigneeComponent = Vue.extend(SidebarAssignees);
+    spyOn(SidebarMediator.prototype, 'saveAssignees').and.callThrough();
+    spyOn(SidebarMediator.prototype, 'assignYourself').and.callThrough();
+    this.mediator = new SidebarMediator(Mock.mediator);
+    loadFixtures('issues/open-issue.html.raw');
+    this.sidebarAssigneesEl = document.querySelector('#js-vue-sidebar-assignees');
+  });
+
+  afterEach(() => {
+    SidebarService.singleton = null;
+    SidebarStore.singleton = null;
+    SidebarMediator.singleton = null;
+  });
+
+  it('calls the mediator when saves the assignees', () => {
+    component = new SidebarAssigneeComponent()
+      .$mount(this.sidebarAssigneesEl);
+    component.saveAssignees();
+
+    expect(SidebarMediator.prototype.saveAssignees).toHaveBeenCalled();
+  });
+
+  it('calls the mediator when "assignSelf" method is called', () => {
+    component = new SidebarAssigneeComponent()
+      .$mount(this.sidebarAssigneesEl);
+    component.assignSelf();
+
+    expect(SidebarMediator.prototype.assignYourself).toHaveBeenCalled();
+    expect(this.mediator.store.assignees.length).toEqual(1);
+  });
+});
diff --git a/spec/javascripts/sidebar/sidebar_bundle_spec.js b/spec/javascripts/sidebar/sidebar_bundle_spec.js
new file mode 100644
index 00000000000..7760b34e071
--- /dev/null
+++ b/spec/javascripts/sidebar/sidebar_bundle_spec.js
@@ -0,0 +1,42 @@
+import Vue from 'vue';
+import SidebarBundleDomContentLoaded from '~/sidebar/sidebar_bundle';
+import SidebarTimeTracking from '~/sidebar/components/time_tracking/sidebar_time_tracking';
+import SidebarMediator from '~/sidebar/sidebar_mediator';
+import SidebarService from '~/sidebar/services/sidebar_service';
+import SidebarStore from '~/sidebar/stores/sidebar_store';
+import Mock from './mock_data';
+
+describe('sidebar bundle', () => {
+  gl.sidebarOptions = Mock.mediator;
+
+  beforeEach(() => {
+    spyOn(SidebarTimeTracking.methods, 'listenForSlashCommands').and.callFake(() => { });
+    preloadFixtures('issues/open-issue.html.raw');
+    Vue.http.interceptors.push(Mock.sidebarMockInterceptor);
+    loadFixtures('issues/open-issue.html.raw');
+    spyOn(Vue.prototype, '$mount');
+    SidebarBundleDomContentLoaded();
+    this.mediator = new SidebarMediator();
+  });
+
+  afterEach(() => {
+    SidebarService.singleton = null;
+    SidebarStore.singleton = null;
+    SidebarMediator.singleton = null;
+  });
+
+  it('the mediator should be already defined with some data', () => {
+    SidebarBundleDomContentLoaded();
+
+    expect(this.mediator.store).toBeDefined();
+    expect(this.mediator.service).toBeDefined();
+    expect(this.mediator.store.currentUser).toEqual(Mock.mediator.currentUser);
+    expect(this.mediator.store.rootPath).toEqual(Mock.mediator.rootPath);
+    expect(this.mediator.store.endPoint).toEqual(Mock.mediator.endPoint);
+    expect(this.mediator.store.editable).toEqual(Mock.mediator.editable);
+  });
+
+  it('the sidebar time tracking and assignees components to have been mounted', () => {
+    expect(Vue.prototype.$mount).toHaveBeenCalledTimes(2);
+  });
+});
diff --git a/spec/javascripts/sidebar/sidebar_mediator_spec.js b/spec/javascripts/sidebar/sidebar_mediator_spec.js
new file mode 100644
index 00000000000..2b00fa17334
--- /dev/null
+++ b/spec/javascripts/sidebar/sidebar_mediator_spec.js
@@ -0,0 +1,40 @@
+import Vue from 'vue';
+import SidebarMediator from '~/sidebar/sidebar_mediator';
+import SidebarStore from '~/sidebar/stores/sidebar_store';
+import SidebarService from '~/sidebar/services/sidebar_service';
+import Mock from './mock_data';
+
+describe('Sidebar mediator', () => {
+  beforeEach(() => {
+    Vue.http.interceptors.push(Mock.sidebarMockInterceptor);
+    this.mediator = new SidebarMediator(Mock.mediator);
+  });
+
+  afterEach(() => {
+    SidebarService.singleton = null;
+    SidebarStore.singleton = null;
+    SidebarMediator.singleton = null;
+  });
+
+  it('assigns yourself ', () => {
+    this.mediator.assignYourself();
+
+    expect(this.mediator.store.currentUser).toEqual(Mock.mediator.currentUser);
+    expect(this.mediator.store.assignees[0]).toEqual(Mock.mediator.currentUser);
+  });
+
+  it('saves assignees', (done) => {
+    this.mediator.saveAssignees('issue[assignee_ids]')
+      .then((resp) => {
+        expect(resp.status).toEqual(200);
+        done();
+      })
+      .catch(() => {});
+  });
+
+  it('fetches the data', () => {
+    spyOn(this.mediator.service, 'get').and.callThrough();
+    this.mediator.fetch();
+    expect(this.mediator.service.get).toHaveBeenCalled();
+  });
+});
diff --git a/spec/javascripts/sidebar/sidebar_service_spec.js b/spec/javascripts/sidebar/sidebar_service_spec.js
new file mode 100644
index 00000000000..d41162096a6
--- /dev/null
+++ b/spec/javascripts/sidebar/sidebar_service_spec.js
@@ -0,0 +1,32 @@
+import Vue from 'vue';
+import SidebarService from '~/sidebar/services/sidebar_service';
+import Mock from './mock_data';
+
+describe('Sidebar service', () => {
+  beforeEach(() => {
+    Vue.http.interceptors.push(Mock.sidebarMockInterceptor);
+    this.service = new SidebarService('/gitlab-org/gitlab-shell/issues/5.json');
+  });
+
+  afterEach(() => {
+    SidebarService.singleton = null;
+  });
+
+  it('gets the data', (done) => {
+    this.service.get()
+      .then((resp) => {
+        expect(resp).toBeDefined();
+        done();
+      })
+      .catch(() => {});
+  });
+
+  it('updates the data', (done) => {
+    this.service.update('issue[assignee_ids]', [1])
+      .then((resp) => {
+        expect(resp).toBeDefined();
+        done();
+      })
+      .catch(() => {});
+  });
+});
diff --git a/spec/javascripts/sidebar/sidebar_store_spec.js b/spec/javascripts/sidebar/sidebar_store_spec.js
new file mode 100644
index 00000000000..29facf483b5
--- /dev/null
+++ b/spec/javascripts/sidebar/sidebar_store_spec.js
@@ -0,0 +1,80 @@
+import SidebarStore from '~/sidebar/stores/sidebar_store';
+import Mock from './mock_data';
+import UsersMockHelper from '../helpers/user_mock_data_helper';
+
+describe('Sidebar store', () => {
+  const assignee = {
+    id: 2,
+    name: 'gitlab user 2',
+    username: 'gitlab2',
+    avatar_url: 'http://www.gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80&d=identicon',
+  };
+
+  const anotherAssignee = {
+    id: 3,
+    name: 'gitlab user 3',
+    username: 'gitlab3',
+    avatar_url: 'http://www.gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80&d=identicon',
+  };
+
+  beforeEach(() => {
+    this.store = new SidebarStore({
+      currentUser: {
+        id: 1,
+        name: 'Administrator',
+        username: 'root',
+        avatar_url: 'http://www.gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80&d=identicon',
+      },
+      editable: true,
+      rootPath: '/',
+      endpoint: '/gitlab-org/gitlab-shell/issues/5.json',
+    });
+  });
+
+  afterEach(() => {
+    SidebarStore.singleton = null;
+  });
+
+  it('adds a new assignee', () => {
+    this.store.addAssignee(assignee);
+    expect(this.store.assignees.length).toEqual(1);
+  });
+
+  it('removes an assignee', () => {
+    this.store.removeAssignee(assignee);
+    expect(this.store.assignees.length).toEqual(0);
+  });
+
+  it('finds an existent assignee', () => {
+    let foundAssignee;
+
+    this.store.addAssignee(assignee);
+    foundAssignee = this.store.findAssignee(assignee);
+    expect(foundAssignee).toBeDefined();
+    expect(foundAssignee).toEqual(assignee);
+    foundAssignee = this.store.findAssignee(anotherAssignee);
+    expect(foundAssignee).toBeUndefined();
+  });
+
+  it('removes all assignees', () => {
+    this.store.removeAllAssignees();
+    expect(this.store.assignees.length).toEqual(0);
+  });
+
+  it('set assigned data', () => {
+    const users = {
+      assignees: UsersMockHelper.createNumberRandomUsers(3),
+    };
+
+    this.store.setAssigneeData(users);
+    expect(this.store.assignees.length).toEqual(3);
+  });
+
+  it('set time tracking data', () => {
+    this.store.setTimeTrackingData(Mock.time);
+    expect(this.store.timeEstimate).toEqual(Mock.time.time_estimate);
+    expect(this.store.totalTimeSpent).toEqual(Mock.time.total_time_spent);
+    expect(this.store.humanTimeEstimate).toEqual(Mock.time.human_time_estimate);
+    expect(this.store.humanTotalTimeSpent).toEqual(Mock.time.human_total_time_spent);
+  });
+});
diff --git a/spec/javascripts/signin_tabs_memoizer_spec.js b/spec/javascripts/signin_tabs_memoizer_spec.js
index d83d9a57b42..5b4f5933b34 100644
--- a/spec/javascripts/signin_tabs_memoizer_spec.js
+++ b/spec/javascripts/signin_tabs_memoizer_spec.js
@@ -1,3 +1,5 @@
+import AccessorUtilities from '~/lib/utils/accessor';
+
 require('~/signin_tabs_memoizer');
 
 ((global) => {
@@ -19,6 +21,8 @@ require('~/signin_tabs_memoizer');
 
     beforeEach(() => {
       loadFixtures(fixtureTemplate);
+
+      spyOn(AccessorUtilities, 'isLocalStorageAccessSafe').and.returnValue(true);
     });
 
     it('does nothing if no tab was previously selected', () => {
@@ -49,5 +53,91 @@ require('~/signin_tabs_memoizer');
 
       expect(memo.readData()).toEqual('#standard');
     });
+
+    describe('class constructor', () => {
+      beforeEach(() => {
+        memo = createMemoizer();
+      });
+
+      it('should set .isLocalStorageAvailable', () => {
+        expect(AccessorUtilities.isLocalStorageAccessSafe).toHaveBeenCalled();
+        expect(memo.isLocalStorageAvailable).toBe(true);
+      });
+    });
+
+    describe('saveData', () => {
+      beforeEach(() => {
+        memo = {
+          currentTabKey,
+        };
+
+        spyOn(localStorage, 'setItem');
+      });
+
+      describe('if .isLocalStorageAvailable is `false`', () => {
+        beforeEach(function () {
+          memo.isLocalStorageAvailable = false;
+
+          global.ActiveTabMemoizer.prototype.saveData.call(memo);
+        });
+
+        it('should not call .setItem', () => {
+          expect(localStorage.setItem).not.toHaveBeenCalled();
+        });
+      });
+
+      describe('if .isLocalStorageAvailable is `true`', () => {
+        const value = 'value';
+
+        beforeEach(function () {
+          memo.isLocalStorageAvailable = true;
+
+          global.ActiveTabMemoizer.prototype.saveData.call(memo, value);
+        });
+
+        it('should call .setItem', () => {
+          expect(localStorage.setItem).toHaveBeenCalledWith(currentTabKey, value);
+        });
+      });
+    });
+
+    describe('readData', () => {
+      const itemValue = 'itemValue';
+      let readData;
+
+      beforeEach(() => {
+        memo = {
+          currentTabKey,
+        };
+
+        spyOn(localStorage, 'getItem').and.returnValue(itemValue);
+      });
+
+      describe('if .isLocalStorageAvailable is `false`', () => {
+        beforeEach(function () {
+          memo.isLocalStorageAvailable = false;
+
+          readData = global.ActiveTabMemoizer.prototype.readData.call(memo);
+        });
+
+        it('should not call .getItem and should return `null`', () => {
+          expect(localStorage.getItem).not.toHaveBeenCalled();
+          expect(readData).toBe(null);
+        });
+      });
+
+      describe('if .isLocalStorageAvailable is `true`', () => {
+        beforeEach(function () {
+          memo.isLocalStorageAvailable = true;
+
+          readData = global.ActiveTabMemoizer.prototype.readData.call(memo);
+        });
+
+        it('should call .getItem and return the localStorage value', () => {
+          expect(window.localStorage.getItem).toHaveBeenCalledWith(currentTabKey);
+          expect(readData).toBe(itemValue);
+        });
+      });
+    });
   });
 })(window);
diff --git a/spec/javascripts/subbable_resource_spec.js b/spec/javascripts/subbable_resource_spec.js
deleted file mode 100644
index 454386697f5..00000000000
--- a/spec/javascripts/subbable_resource_spec.js
+++ /dev/null
@@ -1,63 +0,0 @@
-/* eslint-disable max-len, arrow-parens, comma-dangle */
-
-require('~/subbable_resource');
-
-/*
-* Test that each rest verb calls the publish and subscribe function and passes the correct value back
-*
-*
-* */
-((global) => {
-  describe('Subbable Resource', function () {
-    describe('PubSub', function () {
-      beforeEach(function () {
-        this.MockResource = new global.SubbableResource('https://example.com');
-      });
-      it('should successfully add a single subscriber', function () {
-        const callback = () => {};
-        this.MockResource.subscribe(callback);
-
-        expect(this.MockResource.subscribers.length).toBe(1);
-        expect(this.MockResource.subscribers[0]).toBe(callback);
-      });
-
-      it('should successfully add multiple subscribers', function () {
-        const callbackOne = () => {};
-        const callbackTwo = () => {};
-        const callbackThree = () => {};
-
-        this.MockResource.subscribe(callbackOne);
-        this.MockResource.subscribe(callbackTwo);
-        this.MockResource.subscribe(callbackThree);
-
-        expect(this.MockResource.subscribers.length).toBe(3);
-      });
-
-      it('should successfully publish an update to a single subscriber', function () {
-        const state = { myprop: 1 };
-
-        const callbacks = {
-          one: (data) => expect(data.myprop).toBe(2),
-          two: (data) => expect(data.myprop).toBe(2),
-          three: (data) => expect(data.myprop).toBe(2)
-        };
-
-        const spyOne = spyOn(callbacks, 'one');
-        const spyTwo = spyOn(callbacks, 'two');
-        const spyThree = spyOn(callbacks, 'three');
-
-        this.MockResource.subscribe(callbacks.one);
-        this.MockResource.subscribe(callbacks.two);
-        this.MockResource.subscribe(callbacks.three);
-
-        state.myprop += 1;
-
-        this.MockResource.publish(state);
-
-        expect(spyOne).toHaveBeenCalled();
-        expect(spyTwo).toHaveBeenCalled();
-        expect(spyThree).toHaveBeenCalled();
-      });
-    });
-  });
-})(window.gl || (window.gl = {}));
diff --git a/spec/lib/banzai/filter/redactor_filter_spec.rb b/spec/lib/banzai/filter/redactor_filter_spec.rb
index 8a6fe1ad6a3..7c4a0f32c7b 100644
--- a/spec/lib/banzai/filter/redactor_filter_spec.rb
+++ b/spec/lib/banzai/filter/redactor_filter_spec.rb
@@ -113,7 +113,7 @@ describe Banzai::Filter::RedactorFilter, lib: true do
       it 'allows references for assignee' do
         assignee = create(:user)
         project = create(:empty_project, :public)
-        issue = create(:issue, :confidential, project: project, assignee: assignee)
+        issue = create(:issue, :confidential, project: project, assignees: [assignee])
 
         link = reference_link(project: project.id, issue: issue.id, reference_type: 'issue')
         doc = filter(link, current_user: assignee)
diff --git a/spec/lib/constraints/group_url_constrainer_spec.rb b/spec/lib/constraints/group_url_constrainer_spec.rb
index f95adf3a84b..db680489a8d 100644
--- a/spec/lib/constraints/group_url_constrainer_spec.rb
+++ b/spec/lib/constraints/group_url_constrainer_spec.rb
@@ -29,9 +29,37 @@ describe GroupUrlConstrainer, lib: true do
 
       it { expect(subject.matches?(request)).to be_falsey }
     end
+
+    context 'when the request matches a redirect route' do
+      context 'for a root group' do
+        let!(:redirect_route) { group.redirect_routes.create!(path: 'gitlabb') }
+
+        context 'and is a GET request' do
+          let(:request) { build_request(redirect_route.path) }
+
+          it { expect(subject.matches?(request)).to be_truthy }
+        end
+
+        context 'and is NOT a GET request' do
+          let(:request) { build_request(redirect_route.path, 'POST') }
+
+          it { expect(subject.matches?(request)).to be_falsey }
+        end
+      end
+
+      context 'for a nested group' do
+        let!(:nested_group) { create(:group, path: 'nested', parent: group) }
+        let!(:redirect_route) { nested_group.redirect_routes.create!(path: 'gitlabb/nested') }
+        let(:request) { build_request(redirect_route.path) }
+
+        it { expect(subject.matches?(request)).to be_truthy }
+      end
+    end
   end
 
-  def build_request(path)
-    double(:request, params: { id: path })
+  def build_request(path, method = 'GET')
+    double(:request,
+      'get?': (method == 'GET'),
+      params: { id: path })
   end
 end
diff --git a/spec/lib/constraints/project_url_constrainer_spec.rb b/spec/lib/constraints/project_url_constrainer_spec.rb
index 4f25ad88960..b6884e37aa3 100644
--- a/spec/lib/constraints/project_url_constrainer_spec.rb
+++ b/spec/lib/constraints/project_url_constrainer_spec.rb
@@ -24,9 +24,26 @@ describe ProjectUrlConstrainer, lib: true do
         it { expect(subject.matches?(request)).to be_falsey }
       end
     end
+
+    context 'when the request matches a redirect route' do
+      let(:old_project_path) { 'old_project_path' }
+      let!(:redirect_route) { project.redirect_routes.create!(path: "#{namespace.full_path}/#{old_project_path}") }
+
+      context 'and is a GET request' do
+        let(:request) { build_request(namespace.full_path, old_project_path) }
+        it { expect(subject.matches?(request)).to be_truthy }
+      end
+
+      context 'and is NOT a GET request' do
+        let(:request) { build_request(namespace.full_path, old_project_path, 'POST') }
+        it { expect(subject.matches?(request)).to be_falsey }
+      end
+    end
   end
 
-  def build_request(namespace, project)
-    double(:request, params: { namespace_id: namespace, id: project })
+  def build_request(namespace, project, method = 'GET')
+    double(:request,
+      'get?': (method == 'GET'),
+      params: { namespace_id: namespace, id: project })
   end
 end
diff --git a/spec/lib/constraints/user_url_constrainer_spec.rb b/spec/lib/constraints/user_url_constrainer_spec.rb
index 207b6fe6c9e..ed69b830979 100644
--- a/spec/lib/constraints/user_url_constrainer_spec.rb
+++ b/spec/lib/constraints/user_url_constrainer_spec.rb
@@ -15,9 +15,26 @@ describe UserUrlConstrainer, lib: true do
 
       it { expect(subject.matches?(request)).to be_falsey }
     end
+
+    context 'when the request matches a redirect route' do
+      let(:old_project_path) { 'old_project_path' }
+      let!(:redirect_route) { user.namespace.redirect_routes.create!(path: 'foo') }
+
+      context 'and is a GET request' do
+        let(:request) { build_request(redirect_route.path) }
+        it { expect(subject.matches?(request)).to be_truthy }
+      end
+
+      context 'and is NOT a GET request' do
+        let(:request) { build_request(redirect_route.path, 'POST') }
+        it { expect(subject.matches?(request)).to be_falsey }
+      end
+    end
   end
 
-  def build_request(username)
-    double(:request, params: { username: username })
+  def build_request(username, method = 'GET')
+    double(:request,
+      'get?': (method == 'GET'),
+      params: { username: username })
   end
 end
diff --git a/spec/lib/gitlab/ci/status/group/common_spec.rb b/spec/lib/gitlab/ci/status/group/common_spec.rb
new file mode 100644
index 00000000000..c0ca05881f5
--- /dev/null
+++ b/spec/lib/gitlab/ci/status/group/common_spec.rb
@@ -0,0 +1,20 @@
+require 'spec_helper'
+
+describe Gitlab::Ci::Status::Group::Common do
+  subject do
+    Gitlab::Ci::Status::Core.new(double, double)
+      .extend(described_class)
+  end
+
+  it 'does not have action' do
+    expect(subject).not_to have_action
+  end
+
+  it 'has details' do
+    expect(subject).not_to have_details
+  end
+
+  it 'has no details_path' do
+    expect(subject.details_path).to be_falsy
+  end
+end
diff --git a/spec/lib/gitlab/ci/status/group/factory_spec.rb b/spec/lib/gitlab/ci/status/group/factory_spec.rb
new file mode 100644
index 00000000000..0cd83123938
--- /dev/null
+++ b/spec/lib/gitlab/ci/status/group/factory_spec.rb
@@ -0,0 +1,13 @@
+require 'spec_helper'
+
+describe Gitlab::Ci::Status::Group::Factory do
+  it 'inherits from the core factory' do
+    expect(described_class)
+      .to be < Gitlab::Ci::Status::Factory
+  end
+
+  it 'exposes group helpers' do
+    expect(described_class.common_helpers)
+      .to eq Gitlab::Ci::Status::Group::Common
+  end
+end
diff --git a/spec/lib/gitlab/github_import/issue_formatter_spec.rb b/spec/lib/gitlab/github_import/issue_formatter_spec.rb
index f34d09f2c1d..a4089592cf2 100644
--- a/spec/lib/gitlab/github_import/issue_formatter_spec.rb
+++ b/spec/lib/gitlab/github_import/issue_formatter_spec.rb
@@ -43,7 +43,7 @@ describe Gitlab::GithubImport::IssueFormatter, lib: true do
           description: "*Created by: octocat*\n\nI'm having a problem with this.",
           state: 'opened',
           author_id: project.creator_id,
-          assignee_id: nil,
+          assignee_ids: [],
           created_at: created_at,
           updated_at: updated_at
         }
@@ -64,7 +64,7 @@ describe Gitlab::GithubImport::IssueFormatter, lib: true do
           description: "*Created by: octocat*\n\nI'm having a problem with this.",
           state: 'closed',
           author_id: project.creator_id,
-          assignee_id: nil,
+          assignee_ids: [],
           created_at: created_at,
           updated_at: updated_at
         }
@@ -77,19 +77,19 @@ describe Gitlab::GithubImport::IssueFormatter, lib: true do
       let(:raw_data) { double(base_data.merge(assignee: octocat)) }
 
       it 'returns nil as assignee_id when is not a GitLab user' do
-        expect(issue.attributes.fetch(:assignee_id)).to be_nil
+        expect(issue.attributes.fetch(:assignee_ids)).to be_empty
       end
 
       it 'returns GitLab user id associated with GitHub id as assignee_id' do
         gl_user = create(:omniauth_user, extern_uid: octocat.id, provider: 'github')
 
-        expect(issue.attributes.fetch(:assignee_id)).to eq gl_user.id
+        expect(issue.attributes.fetch(:assignee_ids)).to eq [gl_user.id]
       end
 
       it 'returns GitLab user id associated with GitHub email as assignee_id' do
         gl_user = create(:user, email: octocat.email)
 
-        expect(issue.attributes.fetch(:assignee_id)).to eq gl_user.id
+        expect(issue.attributes.fetch(:assignee_ids)).to eq [gl_user.id]
       end
     end
 
diff --git a/spec/lib/gitlab/gl_repository_spec.rb b/spec/lib/gitlab/gl_repository_spec.rb
new file mode 100644
index 00000000000..ac3558ab386
--- /dev/null
+++ b/spec/lib/gitlab/gl_repository_spec.rb
@@ -0,0 +1,19 @@
+require 'spec_helper'
+
+describe ::Gitlab::GlRepository do
+  describe '.parse' do
+    set(:project) { create(:project) }
+
+    it 'parses a project gl_repository' do
+      expect(described_class.parse("project-#{project.id}")).to eq([project, false])
+    end
+
+    it 'parses a wiki gl_repository' do
+      expect(described_class.parse("wiki-#{project.id}")).to eq([project, true])
+    end
+
+    it 'throws an argument error on an invalid gl_repository' do
+      expect { described_class.parse("badformat-#{project.id}") }.to raise_error(ArgumentError)
+    end
+  end
+end
diff --git a/spec/lib/gitlab/google_code_import/importer_spec.rb b/spec/lib/gitlab/google_code_import/importer_spec.rb
index ccaa88a5c79..622a0f513f4 100644
--- a/spec/lib/gitlab/google_code_import/importer_spec.rb
+++ b/spec/lib/gitlab/google_code_import/importer_spec.rb
@@ -49,7 +49,7 @@ describe Gitlab::GoogleCodeImport::Importer, lib: true do
       expect(issue).not_to be_nil
       expect(issue.iid).to eq(169)
       expect(issue.author).to eq(project.creator)
-      expect(issue.assignee).to eq(mapped_user)
+      expect(issue.assignees).to eq([mapped_user])
       expect(issue.state).to eq("closed")
       expect(issue.label_names).to include("Priority: Medium")
       expect(issue.label_names).to include("Status: Fixed")
diff --git a/spec/lib/gitlab/import_export/all_models.yml b/spec/lib/gitlab/import_export/all_models.yml
index 0abf89d060c..baa81870e81 100644
--- a/spec/lib/gitlab/import_export/all_models.yml
+++ b/spec/lib/gitlab/import_export/all_models.yml
@@ -3,12 +3,13 @@ issues:
 - subscriptions
 - award_emoji
 - author
-- assignee
+- assignees
 - updated_by
 - milestone
 - notes
 - label_links
 - labels
+- last_edited_by
 - todos
 - user_agent_detail
 - moved_to
@@ -16,6 +17,7 @@ issues:
 - merge_requests_closing_issues
 - metrics
 - timelogs
+- issue_assignees
 events:
 - author
 - project
@@ -26,6 +28,7 @@ notes:
 - noteable
 - author
 - updated_by
+- last_edited_by
 - resolved_by
 - todos
 - events
@@ -71,6 +74,7 @@ merge_requests:
 - notes
 - label_links
 - labels
+- last_edited_by
 - todos
 - target_project
 - source_project
@@ -225,6 +229,7 @@ project:
 - authorized_users
 - project_authorizations
 - route
+- redirect_routes
 - statistics
 - container_repositories
 - uploads
diff --git a/spec/lib/gitlab/import_export/project_tree_saver_spec.rb b/spec/lib/gitlab/import_export/project_tree_saver_spec.rb
index 1035428b2e7..5aeb29b7fec 100644
--- a/spec/lib/gitlab/import_export/project_tree_saver_spec.rb
+++ b/spec/lib/gitlab/import_export/project_tree_saver_spec.rb
@@ -203,7 +203,7 @@ describe Gitlab::ImportExport::ProjectTreeSaver, services: true do
   end
 
   def setup_project
-    issue = create(:issue, assignee: user)
+    issue = create(:issue, assignees: [user])
     snippet = create(:project_snippet)
     release = create(:release)
     group = create(:group)
diff --git a/spec/lib/gitlab/import_export/safe_model_attributes.yml b/spec/lib/gitlab/import_export/safe_model_attributes.yml
index 59c8b48a2be..a66086f8b47 100644
--- a/spec/lib/gitlab/import_export/safe_model_attributes.yml
+++ b/spec/lib/gitlab/import_export/safe_model_attributes.yml
@@ -23,6 +23,8 @@ Issue:
 - weight
 - time_estimate
 - relative_position
+- last_edited_at
+- last_edited_by_id
 Event:
 - id
 - target_type
@@ -154,6 +156,8 @@ MergeRequest:
 - approvals_before_merge
 - rebase_commit_sha
 - time_estimate
+- last_edited_at
+- last_edited_by_id
 MergeRequestDiff:
 - id
 - state
diff --git a/spec/lib/gitlab/project_search_results_spec.rb b/spec/lib/gitlab/project_search_results_spec.rb
index e0ebea63eb4..a7c8e7f1f57 100644
--- a/spec/lib/gitlab/project_search_results_spec.rb
+++ b/spec/lib/gitlab/project_search_results_spec.rb
@@ -89,7 +89,7 @@ describe Gitlab::ProjectSearchResults, lib: true do
     let(:project) { create(:empty_project, :internal) }
     let!(:issue) { create(:issue, project: project, title: 'Issue 1') }
     let!(:security_issue_1) { create(:issue, :confidential, project: project, title: 'Security issue 1', author: author) }
-    let!(:security_issue_2) { create(:issue, :confidential, title: 'Security issue 2', project: project, assignee: assignee) }
+    let!(:security_issue_2) { create(:issue, :confidential, title: 'Security issue 2', project: project, assignees: [assignee]) }
 
     it 'does not list project confidential issues for non project members' do
       results = described_class.new(non_member, project, query)
diff --git a/spec/lib/gitlab/repo_path_spec.rb b/spec/lib/gitlab/repo_path_spec.rb
index 0fb5d7646f2..f94c9c2e315 100644
--- a/spec/lib/gitlab/repo_path_spec.rb
+++ b/spec/lib/gitlab/repo_path_spec.rb
@@ -1,6 +1,30 @@
 require 'spec_helper'
 
 describe ::Gitlab::RepoPath do
+  describe '.parse' do
+    set(:project) { create(:project) }
+
+    it 'parses a full repository path' do
+      expect(described_class.parse(project.repository.path)).to eq([project, false])
+    end
+
+    it 'parses a full wiki path' do
+      expect(described_class.parse(project.wiki.repository.path)).to eq([project, true])
+    end
+
+    it 'parses a relative repository path' do
+      expect(described_class.parse(project.full_path + '.git')).to eq([project, false])
+    end
+
+    it 'parses a relative wiki path' do
+      expect(described_class.parse(project.full_path + '.wiki.git')).to eq([project, true])
+    end
+
+    it 'parses a relative path starting with /' do
+      expect(described_class.parse('/' + project.full_path + '.git')).to eq([project, false])
+    end
+  end
+
   describe '.strip_storage_path' do
     before do
       allow(Gitlab.config.repositories).to receive(:storages).and_return({
diff --git a/spec/lib/gitlab/search_results_spec.rb b/spec/lib/gitlab/search_results_spec.rb
index 847fb977400..31c3cd4d53c 100644
--- a/spec/lib/gitlab/search_results_spec.rb
+++ b/spec/lib/gitlab/search_results_spec.rb
@@ -72,9 +72,9 @@ describe Gitlab::SearchResults do
     let(:admin) { create(:admin) }
     let!(:issue) { create(:issue, project: project_1, title: 'Issue 1') }
     let!(:security_issue_1) { create(:issue, :confidential, project: project_1, title: 'Security issue 1', author: author) }
-    let!(:security_issue_2) { create(:issue, :confidential, title: 'Security issue 2', project: project_1, assignee: assignee) }
+    let!(:security_issue_2) { create(:issue, :confidential, title: 'Security issue 2', project: project_1, assignees: [assignee]) }
     let!(:security_issue_3) { create(:issue, :confidential, project: project_2, title: 'Security issue 3', author: author) }
-    let!(:security_issue_4) { create(:issue, :confidential, project: project_3, title: 'Security issue 4', assignee: assignee) }
+    let!(:security_issue_4) { create(:issue, :confidential, project: project_3, title: 'Security issue 4', assignees: [assignee]) }
     let!(:security_issue_5) { create(:issue, :confidential, project: project_4, title: 'Security issue 5') }
 
     it 'does not list confidential issues for non project members' do
diff --git a/spec/lib/gitlab/workhorse_spec.rb b/spec/lib/gitlab/workhorse_spec.rb
index b703e9808a8..beb1791a429 100644
--- a/spec/lib/gitlab/workhorse_spec.rb
+++ b/spec/lib/gitlab/workhorse_spec.rb
@@ -181,10 +181,23 @@ describe Gitlab::Workhorse, lib: true do
     let(:user) { create(:user) }
     let(:repo_path) { repository.path_to_repo }
     let(:action) { 'info_refs' }
+    let(:params) do
+      { GL_ID: "user-#{user.id}", GL_REPOSITORY: "project-#{project.id}", RepoPath: repo_path }
+    end
+
+    subject { described_class.git_http_ok(repository, false, user, action) }
+
+    it { expect(subject).to include(params) }
 
-    subject { described_class.git_http_ok(repository, user, action) }
+    context 'when is_wiki' do
+      let(:params) do
+        { GL_ID: "user-#{user.id}", GL_REPOSITORY: "wiki-#{project.id}", RepoPath: repo_path }
+      end
+
+      subject { described_class.git_http_ok(repository, true, user, action) }
 
-    it { expect(subject).to include({ GL_ID: "user-#{user.id}", RepoPath: repo_path }) }
+      it { expect(subject).to include(params) }
+    end
 
     context 'when Gitaly is enabled' do
       let(:gitaly_params) do
diff --git a/spec/mailers/notify_spec.rb b/spec/mailers/notify_spec.rb
index 9f12e40d808..1e6260270fe 100644
--- a/spec/mailers/notify_spec.rb
+++ b/spec/mailers/notify_spec.rb
@@ -36,11 +36,11 @@ describe Notify do
       end
 
       context 'for issues' do
-        let(:issue) { create(:issue, author: current_user, assignee: assignee, project: project) }
-        let(:issue_with_description) { create(:issue, author: current_user, assignee: assignee, project: project, description: 'My awesome description') }
+        let(:issue) { create(:issue, author: current_user, assignees: [assignee], project: project) }
+        let(:issue_with_description) { create(:issue, author: current_user, assignees: [assignee], project: project, description: 'My awesome description') }
 
         describe 'that are new' do
-          subject { described_class.new_issue_email(issue.assignee_id, issue.id) }
+          subject { described_class.new_issue_email(issue.assignees.first.id, issue.id) }
 
           it_behaves_like 'an assignee email'
           it_behaves_like 'an email starting a new thread with reply-by-email enabled' do
@@ -69,7 +69,7 @@ describe Notify do
         end
 
         describe 'that are new with a description' do
-          subject { described_class.new_issue_email(issue_with_description.assignee_id, issue_with_description.id) }
+          subject { described_class.new_issue_email(issue_with_description.assignees.first.id, issue_with_description.id) }
 
           it_behaves_like 'it should show Gmail Actions View Issue link'
 
@@ -79,7 +79,7 @@ describe Notify do
         end
 
         describe 'that have been reassigned' do
-          subject { described_class.reassigned_issue_email(recipient.id, issue.id, previous_assignee.id, current_user.id) }
+          subject { described_class.reassigned_issue_email(recipient.id, issue.id, [previous_assignee.id], current_user.id) }
 
           it_behaves_like 'a multiple recipients email'
           it_behaves_like 'an answer to an existing thread with reply-by-email enabled' do
diff --git a/spec/models/ci/group_spec.rb b/spec/models/ci/group_spec.rb
new file mode 100644
index 00000000000..62e15093089
--- /dev/null
+++ b/spec/models/ci/group_spec.rb
@@ -0,0 +1,44 @@
+require 'spec_helper'
+
+describe Ci::Group, models: true do
+  subject do
+    described_class.new('test', name: 'rspec', jobs: jobs)
+  end
+
+  let!(:jobs) { build_list(:ci_build, 1, :success) }
+
+  it { is_expected.to include_module(StaticModel) }
+
+  it { is_expected.to respond_to(:stage) }
+  it { is_expected.to respond_to(:name) }
+  it { is_expected.to respond_to(:jobs) }
+  it { is_expected.to respond_to(:status) }
+
+  describe '#size' do
+    it 'returns the number of statuses in the group' do
+      expect(subject.size).to eq(1)
+    end
+  end
+
+  describe '#detailed_status' do
+    context 'when there is only one item in the group' do
+      it 'calls the status from the object itself' do
+        expect(jobs.first).to receive(:detailed_status)
+
+        expect(subject.detailed_status(double(:user)))
+      end
+    end
+
+    context 'when there are more than one commit status in the group' do
+      let(:jobs) do
+        [create(:ci_build, :failed),
+         create(:ci_build, :success)]
+      end
+
+      it 'fabricates a new detailed status object' do
+        expect(subject.detailed_status(double(:user)))
+          .to be_a(Gitlab::Ci::Status::Failed)
+      end
+    end
+  end
+end
diff --git a/spec/models/ci/stage_spec.rb b/spec/models/ci/stage_spec.rb
index c38faf32f7d..372b662fab2 100644
--- a/spec/models/ci/stage_spec.rb
+++ b/spec/models/ci/stage_spec.rb
@@ -28,6 +28,35 @@ describe Ci::Stage, models: true do
     end
   end
 
+  describe '#groups' do
+    before do
+      create_job(:ci_build, name: 'rspec 0 2')
+      create_job(:ci_build, name: 'rspec 0 1')
+      create_job(:ci_build, name: 'spinach 0 1')
+      create_job(:commit_status, name: 'aaaaa')
+    end
+
+    it 'returns an array of three groups' do
+      expect(stage.groups).to be_a Array
+      expect(stage.groups).to all(be_a Ci::Group)
+      expect(stage.groups.size).to eq 3
+    end
+
+    it 'returns groups with correctly ordered statuses' do
+      expect(stage.groups.first.jobs.map(&:name))
+        .to eq ['aaaaa']
+      expect(stage.groups.second.jobs.map(&:name))
+        .to eq ['rspec 0 1', 'rspec 0 2']
+      expect(stage.groups.third.jobs.map(&:name))
+        .to eq ['spinach 0 1']
+    end
+
+    it 'returns groups with correct names' do
+      expect(stage.groups.map(&:name))
+        .to eq %w[aaaaa rspec spinach]
+    end
+  end
+
   describe '#statuses_count' do
     before do
       create_job(:ci_build)
@@ -223,7 +252,7 @@ describe Ci::Stage, models: true do
     end
   end
 
-  def create_job(type, status: 'success', stage: stage_name)
-    create(type, pipeline: pipeline, stage: stage, status: status)
+  def create_job(type, status: 'success', stage: stage_name, **opts)
+    create(type, pipeline: pipeline, stage: stage, status: status, **opts)
   end
 end
diff --git a/spec/models/concerns/issuable_spec.rb b/spec/models/concerns/issuable_spec.rb
index 3ecba2e9687..27890e33b49 100644
--- a/spec/models/concerns/issuable_spec.rb
+++ b/spec/models/concerns/issuable_spec.rb
@@ -10,7 +10,6 @@ describe Issuable do
 
     it { is_expected.to belong_to(:project) }
     it { is_expected.to belong_to(:author) }
-    it { is_expected.to belong_to(:assignee) }
     it { is_expected.to have_many(:notes).dependent(:destroy) }
     it { is_expected.to have_many(:todos).dependent(:destroy) }
 
@@ -66,60 +65,6 @@ describe Issuable do
     end
   end
 
-  describe 'assignee_name' do
-    it 'is delegated to assignee' do
-      issue.update!(assignee: create(:user))
-
-      expect(issue.assignee_name).to eq issue.assignee.name
-    end
-
-    it 'returns nil when assignee is nil' do
-      issue.assignee_id = nil
-      issue.save(validate: false)
-
-      expect(issue.assignee_name).to eq nil
-    end
-  end
-
-  describe "before_save" do
-    describe "#update_cache_counts" do
-      context "when previous assignee exists" do
-        before do
-          assignee = create(:user)
-          issue.project.team << [assignee, :developer]
-          issue.update(assignee: assignee)
-        end
-
-        it "updates cache counts for new assignee" do
-          user = create(:user)
-
-          expect(user).to receive(:update_cache_counts)
-
-          issue.update(assignee: user)
-        end
-
-        it "updates cache counts for previous assignee" do
-          old_assignee = issue.assignee
-          allow(User).to receive(:find_by_id).with(old_assignee.id).and_return(old_assignee)
-
-          expect(old_assignee).to receive(:update_cache_counts)
-
-          issue.update(assignee: nil)
-        end
-      end
-
-      context "when previous assignee does not exist" do
-        before{ issue.update(assignee: nil) }
-
-        it "updates cache count for the new assignee" do
-          expect_any_instance_of(User).to receive(:update_cache_counts)
-
-          issue.update(assignee: user)
-        end
-      end
-    end
-  end
-
   describe ".search" do
     let!(:searchable_issue) { create(:issue, title: "Searchable issue") }
 
@@ -307,7 +252,20 @@ describe Issuable do
     end
 
     context "issue is assigned" do
-      before { issue.update_attribute(:assignee, user) }
+      before { issue.assignees << user }
+
+      it "returns correct hook data" do
+        expect(data[:assignees].first).to eq(user.hook_attrs)
+      end
+    end
+
+    context "merge_request is assigned" do
+      let(:merge_request) { create(:merge_request) }
+      let(:data) { merge_request.to_hook_data(user) }
+
+      before do
+        merge_request.update_attribute(:assignee, user)
+      end
 
       it "returns correct hook data" do
         expect(data[:object_attributes]['assignee_id']).to eq(user.id)
@@ -329,24 +287,6 @@ describe Issuable do
     include_examples 'deprecated repository hook data'
   end
 
-  describe '#card_attributes' do
-    it 'includes the author name' do
-      allow(issue).to receive(:author).and_return(double(name: 'Robert'))
-      allow(issue).to receive(:assignee).and_return(nil)
-
-      expect(issue.card_attributes).
-        to eq({ 'Author' => 'Robert', 'Assignee' => nil })
-    end
-
-    it 'includes the assignee name' do
-      allow(issue).to receive(:author).and_return(double(name: 'Robert'))
-      allow(issue).to receive(:assignee).and_return(double(name: 'Douwe'))
-
-      expect(issue.card_attributes).
-        to eq({ 'Author' => 'Robert', 'Assignee' => 'Douwe' })
-    end
-  end
-
   describe '#labels_array' do
     let(:project) { create(:empty_project) }
     let(:bug) { create(:label, project: project, title: 'bug') }
@@ -475,27 +415,6 @@ describe Issuable do
     end
   end
 
-  describe '#assignee_or_author?' do
-    let(:user) { build(:user, id: 1) }
-    let(:issue) { build(:issue) }
-
-    it 'returns true for a user that is assigned to an issue' do
-      issue.assignee = user
-
-      expect(issue.assignee_or_author?(user)).to eq(true)
-    end
-
-    it 'returns true for a user that is the author of an issue' do
-      issue.author = user
-
-      expect(issue.assignee_or_author?(user)).to eq(true)
-    end
-
-    it 'returns false for a user that is not the assignee or author' do
-      expect(issue.assignee_or_author?(user)).to eq(false)
-    end
-  end
-
   describe '#spend_time' do
     let(:user) { create(:user) }
     let(:issue) { create(:issue) }
diff --git a/spec/models/concerns/milestoneish_spec.rb b/spec/models/concerns/milestoneish_spec.rb
index 68e4c0a522b..675b730c557 100644
--- a/spec/models/concerns/milestoneish_spec.rb
+++ b/spec/models/concerns/milestoneish_spec.rb
@@ -11,13 +11,13 @@ describe Milestone, 'Milestoneish' do
   let(:milestone) { create(:milestone, project: project) }
   let!(:issue) { create(:issue, project: project, milestone: milestone) }
   let!(:security_issue_1) { create(:issue, :confidential, project: project, author: author, milestone: milestone) }
-  let!(:security_issue_2) { create(:issue, :confidential, project: project, assignee: assignee, milestone: milestone) }
+  let!(:security_issue_2) { create(:issue, :confidential, project: project, assignees: [assignee], milestone: milestone) }
   let!(:closed_issue_1) { create(:issue, :closed, project: project, milestone: milestone) }
   let!(:closed_issue_2) { create(:issue, :closed, project: project, milestone: milestone) }
   let!(:closed_security_issue_1) { create(:issue, :confidential, :closed, project: project, author: author, milestone: milestone) }
-  let!(:closed_security_issue_2) { create(:issue, :confidential, :closed, project: project, assignee: assignee, milestone: milestone) }
+  let!(:closed_security_issue_2) { create(:issue, :confidential, :closed, project: project, assignees: [assignee], milestone: milestone) }
   let!(:closed_security_issue_3) { create(:issue, :confidential, :closed, project: project, author: author, milestone: milestone) }
-  let!(:closed_security_issue_4) { create(:issue, :confidential, :closed, project: project, assignee: assignee, milestone: milestone) }
+  let!(:closed_security_issue_4) { create(:issue, :confidential, :closed, project: project, assignees: [assignee], milestone: milestone) }
   let!(:merge_request) { create(:merge_request, source_project: project, target_project: project, milestone: milestone) }
 
   before do
diff --git a/spec/models/concerns/routable_spec.rb b/spec/models/concerns/routable_spec.rb
index 221647d7a48..49a4132f763 100644
--- a/spec/models/concerns/routable_spec.rb
+++ b/spec/models/concerns/routable_spec.rb
@@ -9,6 +9,7 @@ describe Group, 'Routable' do
 
   describe 'Associations' do
     it { is_expected.to have_one(:route).dependent(:destroy) }
+    it { is_expected.to have_many(:redirect_routes).dependent(:destroy) }
   end
 
   describe 'Callbacks' do
@@ -35,10 +36,53 @@ describe Group, 'Routable' do
   describe '.find_by_full_path' do
     let!(:nested_group) { create(:group, parent: group) }
 
-    it { expect(described_class.find_by_full_path(group.to_param)).to eq(group) }
-    it { expect(described_class.find_by_full_path(group.to_param.upcase)).to eq(group) }
-    it { expect(described_class.find_by_full_path(nested_group.to_param)).to eq(nested_group) }
-    it { expect(described_class.find_by_full_path('unknown')).to eq(nil) }
+    context 'without any redirect routes' do
+      it { expect(described_class.find_by_full_path(group.to_param)).to eq(group) }
+      it { expect(described_class.find_by_full_path(group.to_param.upcase)).to eq(group) }
+      it { expect(described_class.find_by_full_path(nested_group.to_param)).to eq(nested_group) }
+      it { expect(described_class.find_by_full_path('unknown')).to eq(nil) }
+    end
+
+    context 'with redirect routes' do
+      let!(:group_redirect_route) { group.redirect_routes.create!(path: 'bar') }
+      let!(:nested_group_redirect_route) { nested_group.redirect_routes.create!(path: nested_group.path.sub('foo', 'bar')) }
+
+      context 'without follow_redirects option' do
+        context 'with the given path not matching any route' do
+          it { expect(described_class.find_by_full_path('unknown')).to eq(nil) }
+        end
+
+        context 'with the given path matching the canonical route' do
+          it { expect(described_class.find_by_full_path(group.to_param)).to eq(group) }
+          it { expect(described_class.find_by_full_path(group.to_param.upcase)).to eq(group) }
+          it { expect(described_class.find_by_full_path(nested_group.to_param)).to eq(nested_group) }
+        end
+
+        context 'with the given path matching a redirect route' do
+          it { expect(described_class.find_by_full_path(group_redirect_route.path)).to eq(nil) }
+          it { expect(described_class.find_by_full_path(group_redirect_route.path.upcase)).to eq(nil) }
+          it { expect(described_class.find_by_full_path(nested_group_redirect_route.path)).to eq(nil) }
+        end
+      end
+
+      context 'with follow_redirects option set to true' do
+        context 'with the given path not matching any route' do
+          it { expect(described_class.find_by_full_path('unknown', follow_redirects: true)).to eq(nil) }
+        end
+
+        context 'with the given path matching the canonical route' do
+          it { expect(described_class.find_by_full_path(group.to_param, follow_redirects: true)).to eq(group) }
+          it { expect(described_class.find_by_full_path(group.to_param.upcase, follow_redirects: true)).to eq(group) }
+          it { expect(described_class.find_by_full_path(nested_group.to_param, follow_redirects: true)).to eq(nested_group) }
+        end
+
+        context 'with the given path matching a redirect route' do
+          it { expect(described_class.find_by_full_path(group_redirect_route.path, follow_redirects: true)).to eq(group) }
+          it { expect(described_class.find_by_full_path(group_redirect_route.path.upcase, follow_redirects: true)).to eq(group) }
+          it { expect(described_class.find_by_full_path(nested_group_redirect_route.path, follow_redirects: true)).to eq(nested_group) }
+        end
+      end
+    end
   end
 
   describe '.where_full_path_in' do
diff --git a/spec/models/event_spec.rb b/spec/models/event_spec.rb
index a9c5b604268..b8cb967c4cc 100644
--- a/spec/models/event_spec.rb
+++ b/spec/models/event_spec.rb
@@ -118,8 +118,8 @@ describe Event, models: true do
     let(:author) { create(:author) }
     let(:assignee) { create(:user) }
     let(:admin) { create(:admin) }
-    let(:issue) { create(:issue, project: project, author: author, assignee: assignee) }
-    let(:confidential_issue) { create(:issue, :confidential, project: project, author: author, assignee: assignee) }
+    let(:issue) { create(:issue, project: project, author: author, assignees: [assignee]) }
+    let(:confidential_issue) { create(:issue, :confidential, project: project, author: author, assignees: [assignee]) }
     let(:note_on_commit) { create(:note_on_commit, project: project) }
     let(:note_on_issue) { create(:note_on_issue, noteable: issue, project: project) }
     let(:note_on_confidential_issue) { create(:note_on_issue, noteable: confidential_issue, project: project) }
diff --git a/spec/models/issue_collection_spec.rb b/spec/models/issue_collection_spec.rb
index d8aed25c041..93c2c538e10 100644
--- a/spec/models/issue_collection_spec.rb
+++ b/spec/models/issue_collection_spec.rb
@@ -28,7 +28,7 @@ describe IssueCollection do
       end
 
       it 'returns the issues the user is assigned to' do
-        issue1.assignee = user
+        issue1.assignees << user
 
         expect(collection.updatable_by_user(user)).to eq([issue1])
       end
diff --git a/spec/models/issue_spec.rb b/spec/models/issue_spec.rb
index 8748b98a4e3..725f5c2311f 100644
--- a/spec/models/issue_spec.rb
+++ b/spec/models/issue_spec.rb
@@ -3,6 +3,7 @@ require 'spec_helper'
 describe Issue, models: true do
   describe "Associations" do
     it { is_expected.to belong_to(:milestone) }
+    it { is_expected.to have_many(:assignees) }
   end
 
   describe 'modules' do
@@ -37,6 +38,64 @@ describe Issue, models: true do
     end
   end
 
+  describe "before_save" do
+    describe "#update_cache_counts when an issue is reassigned" do
+      let(:issue) { create(:issue) }
+      let(:assignee) { create(:user) }
+
+      context "when previous assignee exists" do
+        before do
+          issue.project.team << [assignee, :developer]
+          issue.assignees << assignee
+        end
+
+        it "updates cache counts for new assignee" do
+          user = create(:user)
+
+          expect(user).to receive(:update_cache_counts)
+
+          issue.assignees << user
+        end
+
+        it "updates cache counts for previous assignee" do
+          issue.assignees.first
+
+          expect_any_instance_of(User).to receive(:update_cache_counts)
+
+          issue.assignees.destroy_all
+        end
+      end
+
+      context "when previous assignee does not exist" do
+        it "updates cache count for the new assignee" do
+          issue.assignees = []
+
+          expect_any_instance_of(User).to receive(:update_cache_counts)
+
+          issue.assignees << assignee
+        end
+      end
+    end
+  end
+
+  describe '#card_attributes' do
+    it 'includes the author name' do
+      allow(subject).to receive(:author).and_return(double(name: 'Robert'))
+      allow(subject).to receive(:assignees).and_return([])
+
+      expect(subject.card_attributes).
+        to eq({ 'Author' => 'Robert', 'Assignee' => '' })
+    end
+
+    it 'includes the assignee name' do
+      allow(subject).to receive(:author).and_return(double(name: 'Robert'))
+      allow(subject).to receive(:assignees).and_return([double(name: 'Douwe')])
+
+      expect(subject.card_attributes).
+        to eq({ 'Author' => 'Robert', 'Assignee' => 'Douwe' })
+    end
+  end
+
   describe '#closed_at' do
     after do
       Timecop.return
@@ -124,13 +183,24 @@ describe Issue, models: true do
     end
   end
 
-  describe '#is_being_reassigned?' do
-    it 'returns true if the issue assignee has changed' do
-      subject.assignee = create(:user)
-      expect(subject.is_being_reassigned?).to be_truthy
+  describe '#assignee_or_author?' do
+    let(:user) { create(:user) }
+    let(:issue) { create(:issue) }
+
+    it 'returns true for a user that is assigned to an issue' do
+      issue.assignees << user
+
+      expect(issue.assignee_or_author?(user)).to be_truthy
     end
-    it 'returns false if the issue assignee has not changed' do
-      expect(subject.is_being_reassigned?).to be_falsey
+
+    it 'returns true for a user that is the author of an issue' do
+      issue.update(author: user)
+
+      expect(issue.assignee_or_author?(user)).to be_truthy
+    end
+
+    it 'returns false for a user that is not the assignee or author' do
+      expect(issue.assignee_or_author?(user)).to be_falsey
     end
   end
 
@@ -383,14 +453,14 @@ describe Issue, models: true do
       user1 = create(:user)
       user2 = create(:user)
       project = create(:empty_project)
-      issue = create(:issue, assignee: user1, project: project)
+      issue = create(:issue, assignees: [user1], project: project)
       project.add_developer(user1)
       project.add_developer(user2)
 
       expect(user1.assigned_open_issues_count).to eq(1)
       expect(user2.assigned_open_issues_count).to eq(0)
 
-      issue.assignee = user2
+      issue.assignees = [user2]
       issue.save
 
       expect(user1.assigned_open_issues_count).to eq(0)
@@ -676,6 +746,11 @@ describe Issue, models: true do
       expect(attrs_hash).to include(:human_total_time_spent)
       expect(attrs_hash).to include('time_estimate')
     end
+
+    it 'includes assignee_ids and deprecated assignee_id' do
+      expect(attrs_hash).to include(:assignee_id)
+      expect(attrs_hash).to include(:assignee_ids)
+    end
   end
 
   describe '#check_for_spam' do
diff --git a/spec/models/merge_request_spec.rb b/spec/models/merge_request_spec.rb
index 8b72125dd5d..6cf3dd30ead 100644
--- a/spec/models/merge_request_spec.rb
+++ b/spec/models/merge_request_spec.rb
@@ -9,6 +9,7 @@ describe MergeRequest, models: true do
     it { is_expected.to belong_to(:target_project).class_name('Project') }
     it { is_expected.to belong_to(:source_project).class_name('Project') }
     it { is_expected.to belong_to(:merge_user).class_name("User") }
+    it { is_expected.to belong_to(:assignee) }
     it { is_expected.to have_many(:merge_request_diffs).dependent(:destroy) }
   end
 
@@ -86,6 +87,86 @@ describe MergeRequest, models: true do
     end
   end
 
+  describe "before_save" do
+    describe "#update_cache_counts when a merge request is reassigned" do
+      let(:project) { create :project }
+      let(:merge_request) { create(:merge_request, source_project: project, target_project: project) }
+      let(:assignee) { create :user }
+
+      context "when previous assignee exists" do
+        before do
+          project.team << [assignee, :developer]
+          merge_request.update(assignee: assignee)
+        end
+
+        it "updates cache counts for new assignee" do
+          user = create(:user)
+
+          expect(user).to receive(:update_cache_counts)
+
+          merge_request.update(assignee: user)
+        end
+
+        it "updates cache counts for previous assignee" do
+          old_assignee = merge_request.assignee
+          allow(User).to receive(:find_by_id).with(old_assignee.id).and_return(old_assignee)
+
+          expect(old_assignee).to receive(:update_cache_counts)
+
+          merge_request.update(assignee: nil)
+        end
+      end
+
+      context "when previous assignee does not exist" do
+        it "updates cache count for the new assignee" do
+          merge_request.update(assignee: nil)
+
+          expect_any_instance_of(User).to receive(:update_cache_counts)
+
+          merge_request.update(assignee: assignee)
+        end
+      end
+    end
+  end
+
+  describe '#card_attributes' do
+    it 'includes the author name' do
+      allow(subject).to receive(:author).and_return(double(name: 'Robert'))
+      allow(subject).to receive(:assignee).and_return(nil)
+
+      expect(subject.card_attributes).
+        to eq({ 'Author' => 'Robert', 'Assignee' => nil })
+    end
+
+    it 'includes the assignee name' do
+      allow(subject).to receive(:author).and_return(double(name: 'Robert'))
+      allow(subject).to receive(:assignee).and_return(double(name: 'Douwe'))
+
+      expect(subject.card_attributes).
+        to eq({ 'Author' => 'Robert', 'Assignee' => 'Douwe' })
+    end
+  end
+
+  describe '#assignee_or_author?' do
+    let(:user) { create(:user) }
+
+    it 'returns true for a user that is assigned to a merge request' do
+      subject.assignee = user
+
+      expect(subject.assignee_or_author?(user)).to eq(true)
+    end
+
+    it 'returns true for a user that is the author of a merge request' do
+      subject.author = user
+
+      expect(subject.assignee_or_author?(user)).to eq(true)
+    end
+
+    it 'returns false for a user that is not the assignee or author' do
+      expect(subject.assignee_or_author?(user)).to eq(false)
+    end
+  end
+
   describe '#cache_merge_request_closes_issues!' do
     before do
       subject.project.team << [subject.author, :developer]
@@ -295,16 +376,6 @@ describe MergeRequest, models: true do
     end
   end
 
-  describe '#is_being_reassigned?' do
-    it 'returns true if the merge_request assignee has changed' do
-      subject.assignee = create(:user)
-      expect(subject.is_being_reassigned?).to be_truthy
-    end
-    it 'returns false if the merge request assignee has not changed' do
-      expect(subject.is_being_reassigned?).to be_falsey
-    end
-  end
-
   describe '#for_fork?' do
     it 'returns true if the merge request is for a fork' do
       subject.source_project = build_stubbed(:empty_project, namespace: create(:group))
diff --git a/spec/models/redirect_route_spec.rb b/spec/models/redirect_route_spec.rb
new file mode 100644
index 00000000000..71827421dd7
--- /dev/null
+++ b/spec/models/redirect_route_spec.rb
@@ -0,0 +1,27 @@
+require 'rails_helper'
+
+describe RedirectRoute, models: true do
+  let(:group) { create(:group) }
+  let!(:redirect_route) { group.redirect_routes.create(path: 'gitlabb') }
+
+  describe 'relationships' do
+    it { is_expected.to belong_to(:source) }
+  end
+
+  describe 'validations' do
+    it { is_expected.to validate_presence_of(:source) }
+    it { is_expected.to validate_presence_of(:path) }
+    it { is_expected.to validate_uniqueness_of(:path) }
+  end
+
+  describe '.matching_path_and_descendants' do
+    let!(:redirect2) { group.redirect_routes.create(path: 'gitlabb/test') }
+    let!(:redirect3) { group.redirect_routes.create(path: 'gitlabb/test/foo') }
+    let!(:redirect4) { group.redirect_routes.create(path: 'gitlabb/test/foo/bar') }
+    let!(:redirect5) { group.redirect_routes.create(path: 'gitlabb/test/baz') }
+
+    it 'returns correct routes' do
+      expect(RedirectRoute.matching_path_and_descendants('gitlabb/test')).to match_array([redirect2, redirect3, redirect4, redirect5])
+    end
+  end
+end
diff --git a/spec/models/route_spec.rb b/spec/models/route_spec.rb
index 171a51fcc5b..c1fe1b06c52 100644
--- a/spec/models/route_spec.rb
+++ b/spec/models/route_spec.rb
@@ -1,19 +1,43 @@
 require 'spec_helper'
 
 describe Route, models: true do
-  let!(:group) { create(:group, path: 'git_lab', name: 'git_lab') }
-  let!(:route) { group.route }
+  let(:group) { create(:group, path: 'git_lab', name: 'git_lab') }
+  let(:route) { group.route }
 
   describe 'relationships' do
     it { is_expected.to belong_to(:source) }
   end
 
   describe 'validations' do
+    before { route }
     it { is_expected.to validate_presence_of(:source) }
     it { is_expected.to validate_presence_of(:path) }
     it { is_expected.to validate_uniqueness_of(:path) }
   end
 
+  describe 'callbacks' do
+    context 'after update' do
+      it 'calls #create_redirect_for_old_path' do
+        expect(route).to receive(:create_redirect_for_old_path)
+        route.update_attributes(path: 'foo')
+      end
+
+      it 'calls #delete_conflicting_redirects' do
+        expect(route).to receive(:delete_conflicting_redirects)
+        route.update_attributes(path: 'foo')
+      end
+    end
+
+    context 'after create' do
+      it 'calls #delete_conflicting_redirects' do
+        route.destroy
+        new_route = Route.new(source: group, path: group.path)
+        expect(new_route).to receive(:delete_conflicting_redirects)
+        new_route.save!
+      end
+    end
+  end
+
   describe '.inside_path' do
     let!(:nested_group) { create(:group, path: 'test', name: 'test', parent: group) }
     let!(:deep_nested_group) { create(:group, path: 'foo', name: 'foo', parent: nested_group) }
@@ -37,7 +61,7 @@ describe Route, models: true do
       context 'when route name is set' do
         before { route.update_attributes(path: 'bar') }
 
-        it "updates children routes with new path" do
+        it 'updates children routes with new path' do
           expect(described_class.exists?(path: 'bar')).to be_truthy
           expect(described_class.exists?(path: 'bar/test')).to be_truthy
           expect(described_class.exists?(path: 'bar/test/foo')).to be_truthy
@@ -56,10 +80,24 @@ describe Route, models: true do
           expect(route.update_attributes(path: 'bar')).to be_truthy
         end
       end
+
+      context 'when conflicting redirects exist' do
+        let!(:conflicting_redirect1) { route.create_redirect('bar/test') }
+        let!(:conflicting_redirect2) { route.create_redirect('bar/test/foo') }
+        let!(:conflicting_redirect3) { route.create_redirect('gitlab-org') }
+
+        it 'deletes the conflicting redirects' do
+          route.update_attributes(path: 'bar')
+
+          expect(RedirectRoute.exists?(path: 'bar/test')).to be_falsey
+          expect(RedirectRoute.exists?(path: 'bar/test/foo')).to be_falsey
+          expect(RedirectRoute.exists?(path: 'gitlab-org')).to be_truthy
+        end
+      end
     end
 
     context 'name update' do
-      it "updates children routes with new path" do
+      it 'updates children routes with new path' do
         route.update_attributes(name: 'bar')
 
         expect(described_class.exists?(name: 'bar')).to be_truthy
@@ -77,4 +115,72 @@ describe Route, models: true do
       end
     end
   end
+
+  describe '#create_redirect_for_old_path' do
+    context 'if the path changed' do
+      it 'creates a RedirectRoute for the old path' do
+        redirect_scope = route.source.redirect_routes.where(path: 'git_lab')
+        expect(redirect_scope.exists?).to be_falsey
+        route.path = 'new-path'
+        route.save!
+        expect(redirect_scope.exists?).to be_truthy
+      end
+    end
+  end
+
+  describe '#create_redirect' do
+    it 'creates a RedirectRoute with the same source' do
+      redirect_route = route.create_redirect('foo')
+      expect(redirect_route).to be_a(RedirectRoute)
+      expect(redirect_route).to be_persisted
+      expect(redirect_route.source).to eq(route.source)
+      expect(redirect_route.path).to eq('foo')
+    end
+  end
+
+  describe '#delete_conflicting_redirects' do
+    context 'when a redirect route with the same path exists' do
+      let!(:redirect1) { route.create_redirect(route.path) }
+
+      it 'deletes the redirect' do
+        route.delete_conflicting_redirects
+        expect(route.conflicting_redirects).to be_empty
+      end
+
+      context 'when redirect routes with paths descending from the route path exists' do
+        let!(:redirect2) { route.create_redirect("#{route.path}/foo") }
+        let!(:redirect3) { route.create_redirect("#{route.path}/foo/bar") }
+        let!(:redirect4) { route.create_redirect("#{route.path}/baz/quz") }
+        let!(:other_redirect) { route.create_redirect("other") }
+
+        it 'deletes all redirects with paths that descend from the route path' do
+          route.delete_conflicting_redirects
+          expect(route.conflicting_redirects).to be_empty
+        end
+      end
+    end
+  end
+
+  describe '#conflicting_redirects' do
+    context 'when a redirect route with the same path exists' do
+      let!(:redirect1) { route.create_redirect(route.path) }
+
+      it 'returns the redirect route' do
+        expect(route.conflicting_redirects).to be_an(ActiveRecord::Relation)
+        expect(route.conflicting_redirects).to match_array([redirect1])
+      end
+
+      context 'when redirect routes with paths descending from the route path exists' do
+        let!(:redirect2) { route.create_redirect("#{route.path}/foo") }
+        let!(:redirect3) { route.create_redirect("#{route.path}/foo/bar") }
+        let!(:redirect4) { route.create_redirect("#{route.path}/baz/quz") }
+        let!(:other_redirect) { route.create_redirect("other") }
+
+        it 'returns the redirect routes' do
+          expect(route.conflicting_redirects).to be_an(ActiveRecord::Relation)
+          expect(route.conflicting_redirects).to match_array([redirect1, redirect2, redirect3, redirect4])
+        end
+      end
+    end
+  end
 end
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
index 401eaac07a1..63e71f5ff2f 100644
--- a/spec/models/user_spec.rb
+++ b/spec/models/user_spec.rb
@@ -849,6 +849,65 @@ describe User, models: true do
     end
   end
 
+  describe '.find_by_full_path' do
+    let!(:user) { create(:user) }
+
+    context 'with a route matching the given path' do
+      let!(:route) { user.namespace.route }
+
+      it 'returns the user' do
+        expect(User.find_by_full_path(route.path)).to eq(user)
+      end
+
+      it 'is case-insensitive' do
+        expect(User.find_by_full_path(route.path.upcase)).to eq(user)
+        expect(User.find_by_full_path(route.path.downcase)).to eq(user)
+      end
+    end
+
+    context 'with a redirect route matching the given path' do
+      let!(:redirect_route) { user.namespace.redirect_routes.create(path: 'foo') }
+
+      context 'without the follow_redirects option' do
+        it 'returns nil' do
+          expect(User.find_by_full_path(redirect_route.path)).to eq(nil)
+        end
+      end
+
+      context 'with the follow_redirects option set to true' do
+        it 'returns the user' do
+          expect(User.find_by_full_path(redirect_route.path, follow_redirects: true)).to eq(user)
+        end
+
+        it 'is case-insensitive' do
+          expect(User.find_by_full_path(redirect_route.path.upcase, follow_redirects: true)).to eq(user)
+          expect(User.find_by_full_path(redirect_route.path.downcase, follow_redirects: true)).to eq(user)
+        end
+      end
+    end
+
+    context 'without a route or a redirect route matching the given path' do
+      context 'without the follow_redirects option' do
+        it 'returns nil' do
+          expect(User.find_by_full_path('unknown')).to eq(nil)
+        end
+      end
+      context 'with the follow_redirects option set to true' do
+        it 'returns nil' do
+          expect(User.find_by_full_path('unknown', follow_redirects: true)).to eq(nil)
+        end
+      end
+    end
+
+    context 'with a group route matching the given path' do
+      let!(:group) { create(:group, path: 'group_path') }
+
+      it 'returns nil' do
+        expect(User.find_by_full_path('group_path')).to eq(nil)
+      end
+    end
+  end
+
   describe 'all_ssh_keys' do
     it { is_expected.to have_many(:keys).dependent(:destroy) }
 
diff --git a/spec/policies/issue_policy_spec.rb b/spec/policies/issue_policy_spec.rb
index 9a870b7fda1..4a07c864428 100644
--- a/spec/policies/issue_policy_spec.rb
+++ b/spec/policies/issue_policy_spec.rb
@@ -15,7 +15,7 @@ describe IssuePolicy, models: true do
   context 'a private project' do
     let(:non_member) { create(:user) }
     let(:project) { create(:empty_project, :private) }
-    let(:issue) { create(:issue, project: project, assignee: assignee, author: author) }
+    let(:issue) { create(:issue, project: project, assignees: [assignee], author: author) }
     let(:issue_no_assignee) { create(:issue, project: project) }
 
     before do
@@ -69,7 +69,7 @@ describe IssuePolicy, models: true do
     end
 
     context 'with confidential issues' do
-      let(:confidential_issue) { create(:issue, :confidential, project: project, assignee: assignee, author: author) }
+      let(:confidential_issue) { create(:issue, :confidential, project: project, assignees: [assignee], author: author) }
       let(:confidential_issue_no_assignee) { create(:issue, :confidential, project: project) }
 
       it 'does not allow non-members to read confidential issues' do
@@ -110,7 +110,7 @@ describe IssuePolicy, models: true do
 
   context 'a public project' do
     let(:project) { create(:empty_project, :public) }
-    let(:issue) { create(:issue, project: project, assignee: assignee, author: author) }
+    let(:issue) { create(:issue, project: project, assignees: [assignee], author: author) }
     let(:issue_no_assignee) { create(:issue, project: project) }
 
     before do
@@ -157,7 +157,7 @@ describe IssuePolicy, models: true do
     end
 
     context 'with confidential issues' do
-      let(:confidential_issue) { create(:issue, :confidential, project: project, assignee: assignee, author: author) }
+      let(:confidential_issue) { create(:issue, :confidential, project: project, assignees: [assignee], author: author) }
       let(:confidential_issue_no_assignee) { create(:issue, :confidential, project: project) }
 
       it 'does not allow guests to read confidential issues' do
diff --git a/spec/requests/api/helpers/internal_helpers_spec.rb b/spec/requests/api/helpers/internal_helpers_spec.rb
deleted file mode 100644
index db716b340f1..00000000000
--- a/spec/requests/api/helpers/internal_helpers_spec.rb
+++ /dev/null
@@ -1,32 +0,0 @@
-require 'spec_helper'
-
-describe ::API::Helpers::InternalHelpers do
-  include described_class
-
-  describe '.clean_project_path' do
-    project = 'namespace/project'
-    namespaced = File.join('namespace2', project)
-
-    {
-      File.join(Dir.pwd, project)    => project,
-      File.join(Dir.pwd, namespaced) => namespaced,
-      project                        => project,
-      namespaced                     => namespaced,
-      project + '.git'               => project,
-      namespaced + '.git'            => namespaced,
-      "/" + project                  => project,
-      "/" + namespaced               => namespaced,
-    }.each do |project_path, expected|
-      context project_path do
-        # Relative and absolute storage paths, with and without trailing /
-        ['.', './', Dir.pwd, Dir.pwd + '/'].each do |storage_path|
-          context "storage path is #{storage_path}" do
-            subject { clean_project_path(project_path, [{ 'path' => storage_path }]) }
-
-            it { is_expected.to eq(expected) }
-          end
-        end
-      end
-    end
-  end
-end
diff --git a/spec/requests/api/internal_spec.rb b/spec/requests/api/internal_spec.rb
index 429f1a4e375..2ceb4648ece 100644
--- a/spec/requests/api/internal_spec.rb
+++ b/spec/requests/api/internal_spec.rb
@@ -180,6 +180,7 @@ describe API::Internal do
           expect(response).to have_http_status(200)
           expect(json_response["status"]).to be_truthy
           expect(json_response["repository_path"]).to eq(project.wiki.repository.path_to_repo)
+          expect(json_response["gl_repository"]).to eq("wiki-#{project.id}")
           expect(user).not_to have_an_activity_record
         end
       end
@@ -191,6 +192,7 @@ describe API::Internal do
           expect(response).to have_http_status(200)
           expect(json_response["status"]).to be_truthy
           expect(json_response["repository_path"]).to eq(project.wiki.repository.path_to_repo)
+          expect(json_response["gl_repository"]).to eq("wiki-#{project.id}")
           expect(user).to have_an_activity_record
         end
       end
@@ -202,6 +204,7 @@ describe API::Internal do
           expect(response).to have_http_status(200)
           expect(json_response["status"]).to be_truthy
           expect(json_response["repository_path"]).to eq(project.repository.path_to_repo)
+          expect(json_response["gl_repository"]).to eq("project-#{project.id}")
           expect(user).to have_an_activity_record
         end
       end
@@ -213,6 +216,7 @@ describe API::Internal do
           expect(response).to have_http_status(200)
           expect(json_response["status"]).to be_truthy
           expect(json_response["repository_path"]).to eq(project.repository.path_to_repo)
+          expect(json_response["gl_repository"]).to eq("project-#{project.id}")
           expect(user).not_to have_an_activity_record
         end
 
@@ -223,6 +227,7 @@ describe API::Internal do
             expect(response).to have_http_status(200)
             expect(json_response["status"]).to be_truthy
             expect(json_response["repository_path"]).to eq(project.repository.path_to_repo)
+            expect(json_response["gl_repository"]).to eq("project-#{project.id}")
           end
         end
 
@@ -233,6 +238,7 @@ describe API::Internal do
             expect(response).to have_http_status(200)
             expect(json_response["status"]).to be_truthy
             expect(json_response["repository_path"]).to eq(project.repository.path_to_repo)
+            expect(json_response["gl_repository"]).to eq("project-#{project.id}")
           end
         end
       end
@@ -444,18 +450,39 @@ describe API::Internal do
 
       expect(json_response).to eq([])
     end
+
+    context 'with a gl_repository parameter' do
+      let(:gl_repository) { "project-#{project.id}" }
+
+      it 'returns link to create new merge request' do
+        get api("/internal/merge_request_urls?gl_repository=#{gl_repository}&changes=#{changes}"), secret_token: secret_token
+
+        expect(json_response).to match [{
+          "branch_name" => "new_branch",
+          "url" => "http://#{Gitlab.config.gitlab.host}/#{project.namespace.name}/#{project.path}/merge_requests/new?merge_request%5Bsource_branch%5D=new_branch",
+          "new_merge_request" => true
+        }]
+      end
+    end
   end
 
   describe 'POST /notify_post_receive' do
     let(:valid_params) do
-      { repo_path: project.repository.path, secret_token: secret_token }
+      { project: project.repository.path, secret_token: secret_token }
+    end
+
+    let(:valid_wiki_params) do
+      { project: project.wiki.repository.path, secret_token: secret_token }
     end
 
     before do
       allow(Gitlab.config.gitaly).to receive(:enabled).and_return(true)
     end
 
-    it "calls the Gitaly client if it's enabled" do
+    it "calls the Gitaly client with the project's repository" do
+      expect(Gitlab::GitalyClient::Notifications).
+        to receive(:new).with(gitlab_git_repository_with(path: project.repository.path)).
+        and_call_original
       expect_any_instance_of(Gitlab::GitalyClient::Notifications).
         to receive(:post_receive)
 
@@ -464,6 +491,18 @@ describe API::Internal do
       expect(response).to have_http_status(200)
     end
 
+    it "calls the Gitaly client with the wiki's repository if it's a wiki" do
+      expect(Gitlab::GitalyClient::Notifications).
+        to receive(:new).with(gitlab_git_repository_with(path: project.wiki.repository.path)).
+        and_call_original
+      expect_any_instance_of(Gitlab::GitalyClient::Notifications).
+        to receive(:post_receive)
+
+      post api("/internal/notify_post_receive"), valid_wiki_params
+
+      expect(response).to have_http_status(200)
+    end
+
     it "returns 500 if the gitaly call fails" do
       expect_any_instance_of(Gitlab::GitalyClient::Notifications).
         to receive(:post_receive).and_raise(GRPC::Unavailable)
@@ -472,6 +511,40 @@ describe API::Internal do
 
       expect(response).to have_http_status(500)
     end
+
+    context 'with a gl_repository parameter' do
+      let(:valid_params) do
+        { gl_repository: "project-#{project.id}", secret_token: secret_token }
+      end
+
+      let(:valid_wiki_params) do
+        { gl_repository: "wiki-#{project.id}", secret_token: secret_token }
+      end
+
+      it "calls the Gitaly client with the project's repository" do
+        expect(Gitlab::GitalyClient::Notifications).
+          to receive(:new).with(gitlab_git_repository_with(path: project.repository.path)).
+          and_call_original
+        expect_any_instance_of(Gitlab::GitalyClient::Notifications).
+          to receive(:post_receive)
+
+        post api("/internal/notify_post_receive"), valid_params
+
+        expect(response).to have_http_status(200)
+      end
+
+      it "calls the Gitaly client with the wiki's repository if it's a wiki" do
+        expect(Gitlab::GitalyClient::Notifications).
+          to receive(:new).with(gitlab_git_repository_with(path: project.wiki.repository.path)).
+          and_call_original
+        expect_any_instance_of(Gitlab::GitalyClient::Notifications).
+          to receive(:post_receive)
+
+        post api("/internal/notify_post_receive"), valid_wiki_params
+
+        expect(response).to have_http_status(200)
+      end
+    end
   end
 
   def project_with_repo_path(path)
diff --git a/spec/requests/api/issues_spec.rb b/spec/requests/api/issues_spec.rb
index 3ca13111acb..da2b56c040b 100644
--- a/spec/requests/api/issues_spec.rb
+++ b/spec/requests/api/issues_spec.rb
@@ -19,7 +19,7 @@ describe API::Issues do
   let!(:closed_issue) do
     create :closed_issue,
            author: user,
-           assignee: user,
+           assignees: [user],
            project: project,
            state: :closed,
            milestone: milestone,
@@ -31,14 +31,14 @@ describe API::Issues do
            :confidential,
            project: project,
            author: author,
-           assignee: assignee,
+           assignees: [assignee],
            created_at: generate(:past_time),
            updated_at: 2.hours.ago
   end
   let!(:issue) do
     create :issue,
            author: user,
-           assignee: user,
+           assignees: [user],
            project: project,
            milestone: milestone,
            created_at: generate(:past_time),
@@ -265,7 +265,7 @@ describe API::Issues do
     let!(:group_closed_issue) do
       create :closed_issue,
              author: user,
-             assignee: user,
+             assignees: [user],
              project: group_project,
              state: :closed,
              milestone: group_milestone,
@@ -276,13 +276,13 @@ describe API::Issues do
              :confidential,
              project: group_project,
              author: author,
-             assignee: assignee,
+             assignees: [assignee],
              updated_at: 2.hours.ago
     end
     let!(:group_issue) do
       create :issue,
              author: user,
-             assignee: user,
+             assignees: [user],
              project: group_project,
              milestone: group_milestone,
              updated_at: 1.hour.ago,
@@ -687,6 +687,7 @@ describe API::Issues do
       expect(json_response['updated_at']).to be_present
       expect(json_response['labels']).to eq(issue.label_names)
       expect(json_response['milestone']).to be_a Hash
+      expect(json_response['assignees']).to be_a Array
       expect(json_response['assignee']).to be_a Hash
       expect(json_response['author']).to be_a Hash
       expect(json_response['confidential']).to be_falsy
@@ -759,15 +760,41 @@ describe API::Issues do
   end
 
   describe "POST /projects/:id/issues" do
+    context 'support for deprecated assignee_id' do
+      it 'creates a new project issue' do
+        post api("/projects/#{project.id}/issues", user),
+          title: 'new issue', assignee_id: user2.id
+
+        expect(response).to have_http_status(201)
+        expect(json_response['title']).to eq('new issue')
+        expect(json_response['assignee']['name']).to eq(user2.name)
+        expect(json_response['assignees'].first['name']).to eq(user2.name)
+      end
+    end
+
+    context 'CE restrictions' do
+      it 'creates a new project issue with no more than one assignee' do
+        post api("/projects/#{project.id}/issues", user),
+          title: 'new issue', assignee_ids: [user2.id, guest.id]
+
+        expect(response).to have_http_status(201)
+        expect(json_response['title']).to eq('new issue')
+        expect(json_response['assignees'].count).to eq(1)
+      end
+    end
+
     it 'creates a new project issue' do
       post api("/projects/#{project.id}/issues", user),
-        title: 'new issue', labels: 'label, label2'
+        title: 'new issue', labels: 'label, label2', weight: 3,
+        assignee_ids: [user2.id]
 
       expect(response).to have_http_status(201)
       expect(json_response['title']).to eq('new issue')
       expect(json_response['description']).to be_nil
       expect(json_response['labels']).to eq(%w(label label2))
       expect(json_response['confidential']).to be_falsy
+      expect(json_response['assignee']['name']).to eq(user2.name)
+      expect(json_response['assignees'].first['name']).to eq(user2.name)
     end
 
     it 'creates a new confidential project issue' do
@@ -1057,6 +1084,57 @@ describe API::Issues do
     end
   end
 
+  describe 'PUT /projects/:id/issues/:issue_iid to update assignee' do
+    context 'support for deprecated assignee_id' do
+      it 'removes assignee' do
+        put api("/projects/#{project.id}/issues/#{issue.iid}", user),
+          assignee_id: 0
+
+        expect(response).to have_http_status(200)
+
+        expect(json_response['assignee']).to be_nil
+      end
+
+      it 'updates an issue with new assignee' do
+        put api("/projects/#{project.id}/issues/#{issue.iid}", user),
+          assignee_id: user2.id
+
+        expect(response).to have_http_status(200)
+
+        expect(json_response['assignee']['name']).to eq(user2.name)
+      end
+    end
+
+    it 'removes assignee' do
+      put api("/projects/#{project.id}/issues/#{issue.iid}", user),
+        assignee_ids: [0]
+
+      expect(response).to have_http_status(200)
+
+      expect(json_response['assignees']).to be_empty
+    end
+
+    it 'updates an issue with new assignee' do
+      put api("/projects/#{project.id}/issues/#{issue.iid}", user),
+        assignee_ids: [user2.id]
+
+      expect(response).to have_http_status(200)
+
+      expect(json_response['assignees'].first['name']).to eq(user2.name)
+    end
+
+    context 'CE restrictions' do
+      it 'updates an issue with several assignee but only one has been applied' do
+        put api("/projects/#{project.id}/issues/#{issue.iid}", user),
+          assignee_ids: [user2.id, guest.id]
+
+        expect(response).to have_http_status(200)
+
+        expect(json_response['assignees'].size).to eq(1)
+      end
+    end
+  end
+
   describe 'PUT /projects/:id/issues/:issue_iid to update labels' do
     let!(:label) { create(:label, title: 'dummy', project: project) }
     let!(:label_link) { create(:label_link, label: label, target: issue) }
diff --git a/spec/requests/api/v3/issues_spec.rb b/spec/requests/api/v3/issues_spec.rb
index ef5b10a1615..cc81922697a 100644
--- a/spec/requests/api/v3/issues_spec.rb
+++ b/spec/requests/api/v3/issues_spec.rb
@@ -14,7 +14,7 @@ describe API::V3::Issues do
   let!(:closed_issue) do
     create :closed_issue,
            author: user,
-           assignee: user,
+           assignees: [user],
            project: project,
            state: :closed,
            milestone: milestone,
@@ -26,14 +26,14 @@ describe API::V3::Issues do
            :confidential,
            project: project,
            author: author,
-           assignee: assignee,
+           assignees: [assignee],
            created_at: generate(:past_time),
            updated_at: 2.hours.ago
   end
   let!(:issue) do
     create :issue,
            author: user,
-           assignee: user,
+           assignees: [user],
            project: project,
            milestone: milestone,
            created_at: generate(:past_time),
@@ -247,7 +247,7 @@ describe API::V3::Issues do
     let!(:group_closed_issue) do
       create :closed_issue,
              author: user,
-             assignee: user,
+             assignees: [user],
              project: group_project,
              state: :closed,
              milestone: group_milestone,
@@ -258,13 +258,13 @@ describe API::V3::Issues do
              :confidential,
              project: group_project,
              author: author,
-             assignee: assignee,
+             assignees: [assignee],
              updated_at: 2.hours.ago
     end
     let!(:group_issue) do
       create :issue,
              author: user,
-             assignee: user,
+             assignees: [user],
              project: group_project,
              milestone: group_milestone,
              updated_at: 1.hour.ago
@@ -737,13 +737,14 @@ describe API::V3::Issues do
   describe "POST /projects/:id/issues" do
     it 'creates a new project issue' do
       post v3_api("/projects/#{project.id}/issues", user),
-        title: 'new issue', labels: 'label, label2'
+        title: 'new issue', labels: 'label, label2', assignee_id: assignee.id
 
       expect(response).to have_http_status(201)
       expect(json_response['title']).to eq('new issue')
       expect(json_response['description']).to be_nil
       expect(json_response['labels']).to eq(%w(label label2))
       expect(json_response['confidential']).to be_falsy
+      expect(json_response['assignee']['name']).to eq(assignee.name)
     end
 
     it 'creates a new confidential project issue' do
@@ -1140,6 +1141,22 @@ describe API::V3::Issues do
     end
   end
 
+  describe 'PUT /projects/:id/issues/:issue_id to update assignee' do
+    it 'updates an issue with no assignee' do
+      put v3_api("/projects/#{project.id}/issues/#{issue.id}", user), assignee_id: 0
+
+      expect(response).to have_http_status(200)
+      expect(json_response['assignee']).to eq(nil)
+    end
+
+    it 'updates an issue with assignee' do
+      put v3_api("/projects/#{project.id}/issues/#{issue.id}", user), assignee_id: user2.id
+
+      expect(response).to have_http_status(200)
+      expect(json_response['assignee']['name']).to eq(user2.name)
+    end
+  end
+
   describe "DELETE /projects/:id/issues/:issue_id" do
     it "rejects a non member from deleting an issue" do
       delete v3_api("/projects/#{project.id}/issues/#{issue.id}", non_member)
diff --git a/spec/routing/project_routing_spec.rb b/spec/routing/project_routing_spec.rb
index 163df072cf6..50e96d56191 100644
--- a/spec/routing/project_routing_spec.rb
+++ b/spec/routing/project_routing_spec.rb
@@ -3,7 +3,7 @@ require 'spec_helper'
 describe 'project routing' do
   before do
     allow(Project).to receive(:find_by_full_path).and_return(false)
-    allow(Project).to receive(:find_by_full_path).with('gitlab/gitlabhq').and_return(true)
+    allow(Project).to receive(:find_by_full_path).with('gitlab/gitlabhq', any_args).and_return(true)
   end
 
   # Shared examples for a resource inside a Project
@@ -93,13 +93,13 @@ describe 'project routing' do
       end
 
       context 'name with dot' do
-        before { allow(Project).to receive(:find_by_full_path).with('gitlab/gitlabhq.keys').and_return(true) }
+        before { allow(Project).to receive(:find_by_full_path).with('gitlab/gitlabhq.keys', any_args).and_return(true) }
 
         it { expect(get('/gitlab/gitlabhq.keys')).to route_to('projects#show', namespace_id: 'gitlab', id: 'gitlabhq.keys') }
       end
 
       context 'with nested group' do
-        before { allow(Project).to receive(:find_by_full_path).with('gitlab/subgroup/gitlabhq').and_return(true) }
+        before { allow(Project).to receive(:find_by_full_path).with('gitlab/subgroup/gitlabhq', any_args).and_return(true) }
 
         it { expect(get('/gitlab/subgroup/gitlabhq')).to route_to('projects#show', namespace_id: 'gitlab/subgroup', id: 'gitlabhq') }
       end
diff --git a/spec/serializers/label_serializer_spec.rb b/spec/serializers/label_serializer_spec.rb
new file mode 100644
index 00000000000..c58c7da1f9e
--- /dev/null
+++ b/spec/serializers/label_serializer_spec.rb
@@ -0,0 +1,46 @@
+require 'spec_helper'
+
+describe LabelSerializer do
+  let(:user) { create(:user) }
+
+  let(:serializer) do
+    described_class.new(user: user)
+  end
+
+  subject { serializer.represent(resource) }
+
+  describe '#represent' do
+    context 'when a single object is being serialized' do
+      let(:resource) { create(:label) }
+
+      it 'serializes the label object' do
+        expect(subject[:id]).to eq resource.id
+      end
+    end
+
+    context 'when multiple objects are being serialized' do
+      let(:num_labels) { 2 }
+      let(:resource) { create_list(:label, num_labels) }
+
+      it 'serializes the array of labels' do
+        expect(subject.size).to eq(num_labels)
+      end
+    end
+  end
+
+  describe '#represent_appearance' do
+    context 'when represents only appearance' do
+      let(:resource) { create(:label) }
+
+      subject { serializer.represent_appearance(resource) }
+
+      it 'serializes only attributes used for appearance' do
+        expect(subject.keys).to eq([:id, :title, :color, :text_color])
+        expect(subject[:id]).to eq(resource.id)
+        expect(subject[:title]).to eq(resource.title)
+        expect(subject[:color]).to eq(resource.color)
+        expect(subject[:text_color]).to eq(resource.text_color)
+      end
+    end
+  end
+end
diff --git a/spec/serializers/stage_entity_spec.rb b/spec/serializers/stage_entity_spec.rb
index 4ab40d08432..0412b2d7741 100644
--- a/spec/serializers/stage_entity_spec.rb
+++ b/spec/serializers/stage_entity_spec.rb
@@ -47,5 +47,13 @@ describe StageEntity do
     it 'contains stage title' do
       expect(subject[:title]).to eq 'test: passed'
     end
+
+    context 'when the jobs should be grouped' do
+      let(:entity) { described_class.new(stage, request: request, grouped: true) }
+
+      it 'exposes the group key' do
+        expect(subject).to include :groups
+      end
+    end
   end
 end
diff --git a/spec/services/issuable/bulk_update_service_spec.rb b/spec/services/issuable/bulk_update_service_spec.rb
index 7a1ac027310..5b1639ca0d6 100644
--- a/spec/services/issuable/bulk_update_service_spec.rb
+++ b/spec/services/issuable/bulk_update_service_spec.rb
@@ -4,11 +4,12 @@ describe Issuable::BulkUpdateService, services: true do
   let(:user)    { create(:user) }
   let(:project) { create(:empty_project, namespace: user.namespace) }
 
-  def bulk_update(issues, extra_params = {})
+  def bulk_update(issuables, extra_params = {})
     bulk_update_params = extra_params
-      .reverse_merge(issuable_ids: Array(issues).map(&:id).join(','))
+      .reverse_merge(issuable_ids: Array(issuables).map(&:id).join(','))
 
-    Issuable::BulkUpdateService.new(project, user, bulk_update_params).execute('issue')
+    type = Array(issuables).first.model_name.param_key
+    Issuable::BulkUpdateService.new(project, user, bulk_update_params).execute(type)
   end
 
   describe 'close issues' do
@@ -47,15 +48,15 @@ describe Issuable::BulkUpdateService, services: true do
     end
   end
 
-  describe 'updating assignee' do
-    let(:issue) { create(:issue, project: project, assignee: user) }
+  describe 'updating merge request assignee' do
+    let(:merge_request) { create(:merge_request, target_project: project, source_project: project, assignee: user) }
 
     context 'when the new assignee ID is a valid user' do
       it 'succeeds' do
         new_assignee = create(:user)
         project.team << [new_assignee, :developer]
 
-        result = bulk_update(issue, assignee_id: new_assignee.id)
+        result = bulk_update(merge_request, assignee_id: new_assignee.id)
 
         expect(result[:success]).to be_truthy
         expect(result[:count]).to eq(1)
@@ -65,22 +66,59 @@ describe Issuable::BulkUpdateService, services: true do
         assignee = create(:user)
         project.team << [assignee, :developer]
 
-        expect { bulk_update(issue, assignee_id: assignee.id) }
-          .to change { issue.reload.assignee }.from(user).to(assignee)
+        expect { bulk_update(merge_request, assignee_id: assignee.id) }
+          .to change { merge_request.reload.assignee }.from(user).to(assignee)
       end
     end
 
     context "when the new assignee ID is #{IssuableFinder::NONE}" do
       it "unassigns the issues" do
-        expect { bulk_update(issue, assignee_id: IssuableFinder::NONE) }
-          .to change { issue.reload.assignee }.to(nil)
+        expect { bulk_update(merge_request, assignee_id: IssuableFinder::NONE) }
+          .to change { merge_request.reload.assignee }.to(nil)
       end
     end
 
     context 'when the new assignee ID is not present' do
       it 'does not unassign' do
-        expect { bulk_update(issue, assignee_id: nil) }
-          .not_to change { issue.reload.assignee }
+        expect { bulk_update(merge_request, assignee_id: nil) }
+          .not_to change { merge_request.reload.assignee }
+      end
+    end
+  end
+
+  describe 'updating issue assignee' do
+    let(:issue) { create(:issue, project: project, assignees: [user]) }
+
+    context 'when the new assignee ID is a valid user' do
+      it 'succeeds' do
+        new_assignee = create(:user)
+        project.team << [new_assignee, :developer]
+
+        result = bulk_update(issue, assignee_ids: [new_assignee.id])
+
+        expect(result[:success]).to be_truthy
+        expect(result[:count]).to eq(1)
+      end
+
+      it 'updates the assignee to the use ID passed' do
+        assignee = create(:user)
+        project.team << [assignee, :developer]
+        expect { bulk_update(issue, assignee_ids: [assignee.id]) }
+          .to change { issue.reload.assignees.first }.from(user).to(assignee)
+      end
+    end
+
+    context "when the new assignee ID is #{IssuableFinder::NONE}" do
+      it "unassigns the issues" do
+        expect { bulk_update(issue, assignee_ids: [IssuableFinder::NONE.to_s]) }
+          .to change { issue.reload.assignees.count }.from(1).to(0)
+      end
+    end
+
+    context 'when the new assignee ID is not present' do
+      it 'does not unassign' do
+        expect { bulk_update(issue, assignee_ids: []) }
+          .not_to change{ issue.reload.assignees }
       end
     end
   end
diff --git a/spec/services/issues/close_service_spec.rb b/spec/services/issues/close_service_spec.rb
index 7a54373963e..51840531711 100644
--- a/spec/services/issues/close_service_spec.rb
+++ b/spec/services/issues/close_service_spec.rb
@@ -4,7 +4,7 @@ describe Issues::CloseService, services: true do
   let(:user) { create(:user) }
   let(:user2) { create(:user) }
   let(:guest) { create(:user) }
-  let(:issue) { create(:issue, assignee: user2) }
+  let(:issue) { create(:issue, assignees: [user2]) }
   let(:project) { issue.project }
   let!(:todo) { create(:todo, :assigned, user: user, project: project, target: issue, author: user2) }
 
diff --git a/spec/services/issues/create_service_spec.rb b/spec/services/issues/create_service_spec.rb
index 80bfb731550..01edc46496d 100644
--- a/spec/services/issues/create_service_spec.rb
+++ b/spec/services/issues/create_service_spec.rb
@@ -6,10 +6,10 @@ describe Issues::CreateService, services: true do
 
   describe '#execute' do
     let(:issue) { described_class.new(project, user, opts).execute }
+    let(:assignee) { create(:user) }
+    let(:milestone) { create(:milestone, project: project) }
 
     context 'when params are valid' do
-      let(:assignee) { create(:user) }
-      let(:milestone) { create(:milestone, project: project) }
       let(:labels) { create_pair(:label, project: project) }
 
       before do
@@ -20,7 +20,7 @@ describe Issues::CreateService, services: true do
       let(:opts) do
         { title: 'Awesome issue',
           description: 'please fix',
-          assignee_id: assignee.id,
+          assignee_ids: [assignee.id],
           label_ids: labels.map(&:id),
           milestone_id: milestone.id,
           due_date: Date.tomorrow }
@@ -29,7 +29,7 @@ describe Issues::CreateService, services: true do
       it 'creates the issue with the given params' do
         expect(issue).to be_persisted
         expect(issue.title).to eq('Awesome issue')
-        expect(issue.assignee).to eq assignee
+        expect(issue.assignees).to eq [assignee]
         expect(issue.labels).to match_array labels
         expect(issue.milestone).to eq milestone
         expect(issue.due_date).to eq Date.tomorrow
@@ -37,6 +37,7 @@ describe Issues::CreateService, services: true do
 
       context 'when current user cannot admin issues in the project' do
         let(:guest) { create(:user) }
+
         before do
           project.team << [guest, :guest]
         end
@@ -47,7 +48,7 @@ describe Issues::CreateService, services: true do
           expect(issue).to be_persisted
           expect(issue.title).to eq('Awesome issue')
           expect(issue.description).to eq('please fix')
-          expect(issue.assignee).to be_nil
+          expect(issue.assignees).to be_empty
           expect(issue.labels).to be_empty
           expect(issue.milestone).to be_nil
           expect(issue.due_date).to be_nil
@@ -136,10 +137,83 @@ describe Issues::CreateService, services: true do
       end
     end
 
-    it_behaves_like 'issuable create service'
+    context 'issue create service' do
+      context 'assignees' do
+        before { project.team << [user, :master] }
+
+        it 'removes assignee when user id is invalid' do
+          opts = { title: 'Title', description: 'Description', assignee_ids: [-1] }
+
+          issue = described_class.new(project, user, opts).execute
+
+          expect(issue.assignees).to be_empty
+        end
+
+        it 'removes assignee when user id is 0' do
+          opts = { title: 'Title', description: 'Description',  assignee_ids: [0] }
+
+          issue = described_class.new(project, user, opts).execute
+
+          expect(issue.assignees).to be_empty
+        end
+
+        it 'saves assignee when user id is valid' do
+          project.team << [assignee, :master]
+          opts = { title: 'Title', description: 'Description', assignee_ids: [assignee.id] }
+
+          issue = described_class.new(project, user, opts).execute
+
+          expect(issue.assignees).to eq([assignee])
+        end
+
+        context "when issuable feature is private" do
+          before do
+            project.project_feature.update(issues_access_level: ProjectFeature::PRIVATE,
+                                           merge_requests_access_level: ProjectFeature::PRIVATE)
+          end
+
+          levels = [Gitlab::VisibilityLevel::INTERNAL, Gitlab::VisibilityLevel::PUBLIC]
+
+          levels.each do |level|
+            it "removes not authorized assignee when project is #{Gitlab::VisibilityLevel.level_name(level)}" do
+              project.update(visibility_level: level)
+              opts = { title: 'Title', description: 'Description', assignee_ids: [assignee.id] }
+
+              issue = described_class.new(project, user, opts).execute
+
+              expect(issue.assignees).to be_empty
+            end
+          end
+        end
+      end
+    end
 
     it_behaves_like 'new issuable record that supports slash commands'
 
+    context 'Slash commands' do
+      context 'with assignee and milestone in params and command' do
+        let(:opts) do
+          {
+            assignee_ids: [create(:user).id],
+            milestone_id: 1,
+            title: 'Title',
+            description: %(/assign @#{assignee.username}\n/milestone %"#{milestone.name}")
+          }
+        end
+
+        before do
+          project.team << [user, :master]
+          project.team << [assignee, :master]
+        end
+
+        it 'assigns and sets milestone to issuable from command' do
+          expect(issue).to be_persisted
+          expect(issue.assignees).to eq([assignee])
+          expect(issue.milestone).to eq(milestone)
+        end
+      end
+    end
+
     context 'resolving discussions' do
       let(:discussion) { create(:diff_note_on_merge_request).to_discussion }
       let(:merge_request) { discussion.noteable }
diff --git a/spec/services/issues/update_service_spec.rb b/spec/services/issues/update_service_spec.rb
index 5b324f3c706..1954d8739f6 100644
--- a/spec/services/issues/update_service_spec.rb
+++ b/spec/services/issues/update_service_spec.rb
@@ -14,7 +14,7 @@ describe Issues::UpdateService, services: true do
   let(:issue) do
     create(:issue, title: 'Old title',
                    description: "for #{user2.to_reference}",
-                   assignee_id: user3.id,
+                   assignee_ids: [user3.id],
                    project: project)
   end
 
@@ -40,7 +40,7 @@ describe Issues::UpdateService, services: true do
         {
           title: 'New title',
           description: 'Also please fix',
-          assignee_id: user2.id,
+          assignee_ids: [user2.id],
           state_event: 'close',
           label_ids: [label.id],
           due_date: Date.tomorrow
@@ -53,15 +53,15 @@ describe Issues::UpdateService, services: true do
         expect(issue).to be_valid
         expect(issue.title).to eq 'New title'
         expect(issue.description).to eq 'Also please fix'
-        expect(issue.assignee).to eq user2
+        expect(issue.assignees).to match_array([user2])
         expect(issue).to be_closed
         expect(issue.labels).to match_array [label]
         expect(issue.due_date).to eq Date.tomorrow
       end
 
       it 'sorts issues as specified by parameters' do
-        issue1 = create(:issue, project: project, assignee_id: user3.id)
-        issue2 = create(:issue, project: project, assignee_id: user3.id)
+        issue1 = create(:issue, project: project, assignees: [user3])
+        issue2 = create(:issue, project: project, assignees: [user3])
 
         [issue, issue1, issue2].each do |issue|
           issue.move_to_end
@@ -87,7 +87,7 @@ describe Issues::UpdateService, services: true do
           expect(issue).to be_valid
           expect(issue.title).to eq 'New title'
           expect(issue.description).to eq 'Also please fix'
-          expect(issue.assignee).to eq user3
+          expect(issue.assignees).to match_array [user3]
           expect(issue.labels).to be_empty
           expect(issue.milestone).to be_nil
           expect(issue.due_date).to be_nil
@@ -132,12 +132,23 @@ describe Issues::UpdateService, services: true do
       end
     end
 
+    context 'when description changed' do
+      it 'creates system note about description change' do
+        update_issue(description: 'Changed description')
+
+        note = find_note('changed the description')
+
+        expect(note).not_to be_nil
+        expect(note.note).to eq('changed the description')
+      end
+    end
+
     context 'when issue turns confidential' do
       let(:opts) do
         {
           title: 'New title',
           description: 'Also please fix',
-          assignee_id: user2.id,
+          assignee_ids: [user2],
           state_event: 'close',
           label_ids: [label.id],
           confidential: true
@@ -163,12 +174,12 @@ describe Issues::UpdateService, services: true do
       it 'does not update assignee_id with unauthorized users' do
         project.update(visibility_level: Gitlab::VisibilityLevel::PUBLIC)
         update_issue(confidential: true)
-        non_member        = create(:user)
-        original_assignee = issue.assignee
+        non_member = create(:user)
+        original_assignees = issue.assignees
 
-        update_issue(assignee_id: non_member.id)
+        update_issue(assignee_ids: [non_member.id])
 
-        expect(issue.reload.assignee_id).to eq(original_assignee.id)
+        expect(issue.reload.assignees).to eq(original_assignees)
       end
     end
 
@@ -205,7 +216,7 @@ describe Issues::UpdateService, services: true do
 
       context 'when is reassigned' do
         before do
-          update_issue(assignee: user2)
+          update_issue(assignees: [user2])
         end
 
         it 'marks previous assignee todos as done' do
@@ -408,6 +419,41 @@ describe Issues::UpdateService, services: true do
       end
     end
 
+    context 'updating asssignee_id' do
+      it 'does not update assignee when assignee_id is invalid' do
+        update_issue(assignee_ids: [-1])
+
+        expect(issue.reload.assignees).to eq([user3])
+      end
+
+      it 'unassigns assignee when user id is 0' do
+        update_issue(assignee_ids: [0])
+
+        expect(issue.reload.assignees).to be_empty
+      end
+
+      it 'does not update assignee_id when user cannot read issue' do
+        update_issue(assignee_ids: [create(:user).id])
+
+        expect(issue.reload.assignees).to eq([user3])
+      end
+
+      context "when issuable feature is private" do
+        levels = [Gitlab::VisibilityLevel::INTERNAL, Gitlab::VisibilityLevel::PUBLIC]
+
+        levels.each do |level|
+          it "does not update with unauthorized assignee when project is #{Gitlab::VisibilityLevel.level_name(level)}" do
+            assignee = create(:user)
+            project.update(visibility_level: level)
+            feature_visibility_attr = :"#{issue.model_name.plural}_access_level"
+            project.project_feature.update_attribute(feature_visibility_attr, ProjectFeature::PRIVATE)
+
+            expect{ update_issue(assignee_ids: [assignee.id]) }.not_to change{ issue.assignees }
+          end
+        end
+      end
+    end
+
     context 'updating mentions' do
       let(:mentionable) { issue }
       include_examples 'updating mentions', Issues::UpdateService
diff --git a/spec/services/members/authorized_destroy_service_spec.rb b/spec/services/members/authorized_destroy_service_spec.rb
index 3b35a3b8e3a..ab440d18e9f 100644
--- a/spec/services/members/authorized_destroy_service_spec.rb
+++ b/spec/services/members/authorized_destroy_service_spec.rb
@@ -14,8 +14,8 @@ describe Members::AuthorizedDestroyService, services: true do
     it "unassigns issues and merge requests" do
       group.add_developer(member_user)
 
-      issue = create :issue, project: group_project, assignee: member_user
-      create :issue, assignee: member_user
+      issue = create :issue, project: group_project, assignees: [member_user]
+      create :issue, assignees: [member_user]
       merge_request = create :merge_request, target_project: group_project, source_project: group_project, assignee: member_user
       create :merge_request, target_project: project, source_project: project, assignee: member_user
 
@@ -33,7 +33,7 @@ describe Members::AuthorizedDestroyService, services: true do
     it "unassigns issues and merge requests" do
       project.team << [member_user, :developer]
 
-      create :issue, project: project, assignee: member_user
+      create :issue, project: project, assignees: [member_user]
       create :merge_request, target_project: project, source_project: project, assignee: member_user
 
       member = project.members.find_by(user_id: member_user.id)
diff --git a/spec/services/merge_requests/assign_issues_service_spec.rb b/spec/services/merge_requests/assign_issues_service_spec.rb
index fe75757dd29..d3556020d4d 100644
--- a/spec/services/merge_requests/assign_issues_service_spec.rb
+++ b/spec/services/merge_requests/assign_issues_service_spec.rb
@@ -15,14 +15,14 @@ describe MergeRequests::AssignIssuesService, services: true do
     expect(service.assignable_issues.map(&:id)).to include(issue.id)
   end
 
-  it 'ignores issues already assigned to any user' do
-    issue.update!(assignee: create(:user))
+  it 'ignores issues the user cannot update assignee on' do
+    project.team.truncate
 
     expect(service.assignable_issues).to be_empty
   end
 
-  it 'ignores issues the user cannot update assignee on' do
-    project.team.truncate
+  it 'ignores issues already assigned to any user' do
+    issue.assignees = [create(:user)]
 
     expect(service.assignable_issues).to be_empty
   end
@@ -44,7 +44,7 @@ describe MergeRequests::AssignIssuesService, services: true do
   end
 
   it 'assigns these to the merge request owner' do
-    expect { service.execute }.to change { issue.reload.assignee }.to(user)
+    expect { service.execute }.to change { issue.assignees.first }.to(user)
   end
 
   it 'ignores external issues' do
diff --git a/spec/services/merge_requests/create_service_spec.rb b/spec/services/merge_requests/create_service_spec.rb
index 0e16c7cc94b..ace82380cc9 100644
--- a/spec/services/merge_requests/create_service_spec.rb
+++ b/spec/services/merge_requests/create_service_spec.rb
@@ -84,7 +84,87 @@ describe MergeRequests::CreateService, services: true do
       end
     end
 
-    it_behaves_like 'issuable create service'
+    context 'Slash commands' do
+      context 'with assignee and milestone in params and command' do
+        let(:merge_request) { described_class.new(project, user, opts).execute }
+        let(:milestone) { create(:milestone, project: project) }
+
+        let(:opts) do
+          {
+            assignee_id: create(:user).id,
+            milestone_id: 1,
+            title: 'Title',
+            description: %(/assign @#{assignee.username}\n/milestone %"#{milestone.name}"),
+            source_branch: 'feature',
+            target_branch: 'master'
+          }
+        end
+
+        before do
+          project.team << [user, :master]
+          project.team << [assignee, :master]
+        end
+
+        it 'assigns and sets milestone to issuable from command' do
+          expect(merge_request).to be_persisted
+          expect(merge_request.assignee).to eq(assignee)
+          expect(merge_request.milestone).to eq(milestone)
+        end
+      end
+    end
+
+    context 'merge request create service' do
+      context 'asssignee_id' do
+        let(:assignee) { create(:user) }
+
+        before { project.team << [user, :master] }
+
+        it 'removes assignee_id when user id is invalid' do
+          opts = { title: 'Title', description: 'Description', assignee_id: -1 }
+
+          merge_request = described_class.new(project, user, opts).execute
+
+          expect(merge_request.assignee_id).to be_nil
+        end
+
+        it 'removes assignee_id when user id is 0' do
+          opts = { title: 'Title', description: 'Description',  assignee_id: 0 }
+
+          merge_request = described_class.new(project, user, opts).execute
+
+          expect(merge_request.assignee_id).to be_nil
+        end
+
+        it 'saves assignee when user id is valid' do
+          project.team << [assignee, :master]
+          opts = { title: 'Title', description: 'Description', assignee_id: assignee.id }
+
+          merge_request = described_class.new(project, user, opts).execute
+
+          expect(merge_request.assignee).to eq(assignee)
+        end
+
+        context "when issuable feature is private" do
+          before do
+            project.project_feature.update(issues_access_level: ProjectFeature::PRIVATE,
+                                           merge_requests_access_level: ProjectFeature::PRIVATE)
+          end
+
+          levels = [Gitlab::VisibilityLevel::INTERNAL, Gitlab::VisibilityLevel::PUBLIC]
+
+          levels.each do |level|
+            it "removes not authorized assignee when project is #{Gitlab::VisibilityLevel.level_name(level)}" do
+              project.update(visibility_level: level)
+              opts = { title: 'Title', description: 'Description', assignee_id: assignee.id }
+
+              merge_request = described_class.new(project, user, opts).execute
+
+              expect(merge_request.assignee_id).to be_nil
+            end
+          end
+        end
+      end
+    end
 
     context 'while saving references to issues that the created merge request closes' do
       let(:first_issue) { create(:issue, project: project) }
diff --git a/spec/services/merge_requests/update_service_spec.rb b/spec/services/merge_requests/update_service_spec.rb
index f2ca1e6fcbd..31487c0f794 100644
--- a/spec/services/merge_requests/update_service_spec.rb
+++ b/spec/services/merge_requests/update_service_spec.rb
@@ -102,6 +102,13 @@ describe MergeRequests::UpdateService, services: true do
         expect(note.note).to eq 'changed title from **{-Old-} title** to **{+New+} title**'
       end
 
+      it 'creates system note about description change' do
+        note = find_note('changed the description')
+
+        expect(note).not_to be_nil
+        expect(note.note).to eq('changed the description')
+      end
+
       it 'creates system note about branch change' do
         note = find_note('changed target')
 
@@ -423,6 +430,54 @@ describe MergeRequests::UpdateService, services: true do
       end
     end
 
+    context 'updating asssignee_id' do
+      it 'does not update assignee when assignee_id is invalid' do
+        merge_request.update(assignee_id: user.id)
+
+        update_merge_request(assignee_id: -1)
+
+        expect(merge_request.reload.assignee).to eq(user)
+      end
+
+      it 'unassigns assignee when user id is 0' do
+        merge_request.update(assignee_id: user.id)
+
+        update_merge_request(assignee_id: 0)
+
+        expect(merge_request.assignee_id).to be_nil
+      end
+
+      it 'saves assignee when user id is valid' do
+        update_merge_request(assignee_id: user.id)
+
+        expect(merge_request.assignee_id).to eq(user.id)
+      end
+
+      it 'does not update assignee_id when user cannot read issue' do
+        non_member        = create(:user)
+        original_assignee = merge_request.assignee
+
+        update_merge_request(assignee_id: non_member.id)
+
+        expect(merge_request.assignee_id).to eq(original_assignee.id)
+      end
+
+      context "when issuable feature is private" do
+        levels = [Gitlab::VisibilityLevel::INTERNAL, Gitlab::VisibilityLevel::PUBLIC]
+
+        levels.each do |level|
+          it "does not update with unauthorized assignee when project is #{Gitlab::VisibilityLevel.level_name(level)}" do
+            assignee = create(:user)
+            project.update(visibility_level: level)
+            feature_visibility_attr = :"#{merge_request.model_name.plural}_access_level"
+            project.project_feature.update_attribute(feature_visibility_attr, ProjectFeature::PRIVATE)
+
+            expect{ update_merge_request(assignee_id: assignee) }.not_to change{ merge_request.assignee }
+          end
+        end
+      end
+    end
+
     include_examples 'issuable update service' do
       let(:open_issuable) { merge_request }
       let(:closed_issuable) { create(:closed_merge_request, source_project: project) }
diff --git a/spec/services/notes/build_service_spec.rb b/spec/services/notes/build_service_spec.rb
index f9dd5541b10..133175769ca 100644
--- a/spec/services/notes/build_service_spec.rb
+++ b/spec/services/notes/build_service_spec.rb
@@ -29,10 +29,82 @@ describe Notes::BuildService, services: true do
           expect(new_note.errors[:base]).to include('Discussion to reply to cannot be found')
         end
       end
+
+      context 'personal snippet note' do
+        def reply(note, user = nil)
+          user ||= create(:user)
+
+          described_class.new(nil,
+                              user,
+                              note: 'Test',
+                              in_reply_to_discussion_id: note.discussion_id).execute
+        end
+
+        let(:snippet_author) { create(:user) }
+
+        context 'when a snippet is public' do
+          it 'creates a reply note' do
+            snippet = create(:personal_snippet, :public)
+            note = create(:discussion_note_on_personal_snippet, noteable: snippet)
+
+            new_note = reply(note)
+
+            expect(new_note).to be_valid
+            expect(new_note.in_reply_to?(note)).to be_truthy
+          end
+        end
+
+        context 'when a snippet is private' do
+          let(:snippet) { create(:personal_snippet, :private, author: snippet_author) }
+          let(:note) { create(:discussion_note_on_personal_snippet, noteable: snippet) }
+
+          it 'creates a reply note when the author replies' do
+            new_note = reply(note, snippet_author)
+
+            expect(new_note).to be_valid
+            expect(new_note.in_reply_to?(note)).to be_truthy
+          end
+
+          it 'sets an error when another user replies' do
+            new_note = reply(note)
+
+            expect(new_note.errors[:base]).to include('Discussion to reply to cannot be found')
+          end
+        end
+
+        context 'when a snippet is internal' do
+          let(:snippet) { create(:personal_snippet, :internal, author: snippet_author) }
+          let(:note) { create(:discussion_note_on_personal_snippet, noteable: snippet) }
+
+          it 'creates a reply note when the author replies' do
+            new_note = reply(note, snippet_author)
+
+            expect(new_note).to be_valid
+            expect(new_note.in_reply_to?(note)).to be_truthy
+          end
+
+          it 'creates a reply note when a regular user replies' do
+            new_note = reply(note)
+
+            expect(new_note).to be_valid
+            expect(new_note.in_reply_to?(note)).to be_truthy
+          end
+
+          it 'sets an error when an external user replies' do
+            new_note = reply(note, create(:user, :external))
+
+            expect(new_note.errors[:base]).to include('Discussion to reply to cannot be found')
+          end
+        end
+      end
     end
 
     it 'builds a note without saving it' do
-      new_note = described_class.new(project, author, noteable_type: note.noteable_type, noteable_id: note.noteable_id, note: 'Test').execute
+      new_note = described_class.new(project,
+                                    author,
+                                    noteable_type: note.noteable_type,
+                                    noteable_id: note.noteable_id,
+                                    note: 'Test').execute
       expect(new_note).to be_valid
       expect(new_note).not_to be_persisted
     end
diff --git a/spec/services/notes/slash_commands_service_spec.rb b/spec/services/notes/slash_commands_service_spec.rb
index 1a64c8bbf00..c9954dc3603 100644
--- a/spec/services/notes/slash_commands_service_spec.rb
+++ b/spec/services/notes/slash_commands_service_spec.rb
@@ -66,7 +66,7 @@ describe Notes::SlashCommandsService, services: true do
           expect(content).to eq ''
           expect(note.noteable).to be_closed
           expect(note.noteable.labels).to match_array(labels)
-          expect(note.noteable.assignee).to eq(assignee)
+          expect(note.noteable.assignees).to eq([assignee])
           expect(note.noteable.milestone).to eq(milestone)
         end
       end
@@ -113,7 +113,7 @@ describe Notes::SlashCommandsService, services: true do
           expect(content).to eq "HELLO\nWORLD"
           expect(note.noteable).to be_closed
           expect(note.noteable.labels).to match_array(labels)
-          expect(note.noteable.assignee).to eq(assignee)
+          expect(note.noteable.assignees).to eq([assignee])
           expect(note.noteable.milestone).to eq(milestone)
         end
       end
@@ -220,4 +220,31 @@ describe Notes::SlashCommandsService, services: true do
       let(:note) { build(:note_on_commit, project: project) }
     end
   end
+
+  context 'CE restriction for issue assignees' do
+    describe '/assign' do
+      let(:project) { create(:empty_project) }
+      let(:master) { create(:user).tap { |u| project.team << [u, :master] } }
+      let(:assignee) { create(:user) }
+      let(:master) { create(:user) }
+      let(:service) { described_class.new(project, master) }
+      let(:note) { create(:note_on_issue, note: note_text, project: project) }
+
+      let(:note_text) do
+        %(/assign @#{assignee.username} @#{master.username}\n")
+      end
+
+      before do
+        project.team << [master, :master]
+        project.team << [assignee, :master]
+      end
+
+      it 'adds only one assignee from the list' do
+        _, command_params = service.extract_commands(note)
+        service.execute(command_params, note)
+
+        expect(note.noteable.assignees.count).to eq(1)
+      end
+    end
+  end
 end
diff --git a/spec/services/notification_service_spec.rb b/spec/services/notification_service_spec.rb
index 989fd90cda9..74f96b97909 100644
--- a/spec/services/notification_service_spec.rb
+++ b/spec/services/notification_service_spec.rb
@@ -4,6 +4,7 @@ describe NotificationService, services: true do
   include EmailHelpers
 
   let(:notification) { NotificationService.new }
+  let(:assignee) { create(:user) }
 
   around(:each) do |example|
     perform_enqueued_jobs do
@@ -52,7 +53,11 @@ describe NotificationService, services: true do
 
   shared_examples 'participating by assignee notification' do
     it 'emails the participant' do
-      issuable.update_attribute(:assignee, participant)
+      if issuable.is_a?(Issue)
+        issuable.assignees << participant
+      else
+        issuable.update_attribute(:assignee, participant)
+      end
 
       notification_trigger
 
@@ -103,14 +108,14 @@ describe NotificationService, services: true do
   describe 'Notes' do
     context 'issue note' do
       let(:project) { create(:empty_project, :private) }
-      let(:issue) { create(:issue, project: project, assignee: create(:user)) }
-      let(:mentioned_issue) { create(:issue, assignee: issue.assignee) }
+      let(:issue) { create(:issue, project: project, assignees: [assignee]) }
+      let(:mentioned_issue) { create(:issue, assignees: issue.assignees) }
       let(:note) { create(:note_on_issue, noteable: issue, project_id: issue.project_id, note: '@mention referenced, @outsider also') }
 
       before do
         build_team(note.project)
         project.add_master(issue.author)
-        project.add_master(issue.assignee)
+        project.add_master(assignee)
         project.add_master(note.author)
         create(:note_on_issue, noteable: issue, project_id: issue.project_id, note: '@subscribed_participant cc this guy')
         update_custom_notification(:new_note, @u_guest_custom, resource: project)
@@ -130,7 +135,7 @@ describe NotificationService, services: true do
 
           should_email(@u_watcher)
           should_email(note.noteable.author)
-          should_email(note.noteable.assignee)
+          should_email(note.noteable.assignees.first)
           should_email(@u_custom_global)
           should_email(@u_mentioned)
           should_email(@subscriber)
@@ -196,7 +201,7 @@ describe NotificationService, services: true do
           notification.new_note(note)
 
           should_email(note.noteable.author)
-          should_email(note.noteable.assignee)
+          should_email(note.noteable.assignees.first)
           should_email(@u_mentioned)
           should_email(@u_custom_global)
           should_not_email(@u_guest_custom)
@@ -218,7 +223,7 @@ describe NotificationService, services: true do
       let(:member) { create(:user) }
       let(:guest) { create(:user) }
       let(:admin) { create(:admin) }
-      let(:confidential_issue) { create(:issue, :confidential, project: project, author: author, assignee: assignee) }
+      let(:confidential_issue) { create(:issue, :confidential, project: project, author: author, assignees: [assignee]) }
       let(:note) { create(:note_on_issue, noteable: confidential_issue, project: project, note: "#{author.to_reference} #{assignee.to_reference} #{non_member.to_reference} #{member.to_reference} #{admin.to_reference}") }
       let(:guest_watcher) { create_user_with_notification(:watch, "guest-watcher-confidential") }
 
@@ -244,8 +249,8 @@ describe NotificationService, services: true do
 
     context 'issue note mention' do
       let(:project) { create(:empty_project, :public) }
-      let(:issue) { create(:issue, project: project, assignee: create(:user)) }
-      let(:mentioned_issue) { create(:issue, assignee: issue.assignee) }
+      let(:issue) { create(:issue, project: project, assignees: [assignee]) }
+      let(:mentioned_issue) { create(:issue, assignees: issue.assignees) }
       let(:note) { create(:note_on_issue, noteable: issue, project_id: issue.project_id, note: '@all mentioned') }
 
       before do
@@ -269,7 +274,7 @@ describe NotificationService, services: true do
 
           should_email(@u_guest_watcher)
           should_email(note.noteable.author)
-          should_email(note.noteable.assignee)
+          should_email(note.noteable.assignees.first)
           should_not_email(note.author)
           should_email(@u_mentioned)
           should_not_email(@u_disabled)
@@ -449,7 +454,7 @@ describe NotificationService, services: true do
     let(:group) { create(:group) }
     let(:project) { create(:empty_project, :public, namespace: group) }
     let(:another_project) { create(:empty_project, :public, namespace: group) }
-    let(:issue) { create :issue, project: project, assignee: create(:user), description: 'cc @participant' }
+    let(:issue) { create :issue, project: project, assignees: [assignee], description: 'cc @participant' }
 
     before do
       build_team(issue.project)
@@ -465,7 +470,7 @@ describe NotificationService, services: true do
       it do
         notification.new_issue(issue, @u_disabled)
 
-        should_email(issue.assignee)
+        should_email(assignee)
         should_email(@u_watcher)
         should_email(@u_guest_watcher)
         should_email(@u_guest_custom)
@@ -480,10 +485,10 @@ describe NotificationService, services: true do
       end
 
       it do
-        create_global_setting_for(issue.assignee, :mention)
+        create_global_setting_for(issue.assignees.first, :mention)
         notification.new_issue(issue, @u_disabled)
 
-        should_not_email(issue.assignee)
+        should_not_email(issue.assignees.first)
       end
 
       it "emails the author if they've opted into notifications about their activity" do
@@ -528,7 +533,7 @@ describe NotificationService, services: true do
         let(:member) { create(:user) }
         let(:guest) { create(:user) }
         let(:admin) { create(:admin) }
-        let(:confidential_issue) { create(:issue, :confidential, project: project, title: 'Confidential issue', author: author, assignee: assignee) }
+        let(:confidential_issue) { create(:issue, :confidential, project: project, title: 'Confidential issue', author: author, assignees: [assignee]) }
 
         it "emails subscribers of the issue's labels that can read the issue" do
           project.add_developer(member)
@@ -572,9 +577,9 @@ describe NotificationService, services: true do
       end
 
       it 'emails new assignee' do
-        notification.reassigned_issue(issue, @u_disabled)
+        notification.reassigned_issue(issue, @u_disabled, [assignee])
 
-        should_email(issue.assignee)
+        should_email(issue.assignees.first)
         should_email(@u_watcher)
         should_email(@u_guest_watcher)
         should_email(@u_guest_custom)
@@ -588,9 +593,8 @@ describe NotificationService, services: true do
       end
 
       it 'emails previous assignee even if he has the "on mention" notif level' do
-        issue.update_attribute(:assignee, @u_mentioned)
-        issue.update_attributes(assignee: @u_watcher)
-        notification.reassigned_issue(issue, @u_disabled)
+        issue.assignees = [@u_mentioned]
+        notification.reassigned_issue(issue, @u_disabled, [@u_watcher])
 
         should_email(@u_mentioned)
         should_email(@u_watcher)
@@ -606,11 +610,11 @@ describe NotificationService, services: true do
       end
 
       it 'emails new assignee even if he has the "on mention" notif level' do
-        issue.update_attributes(assignee: @u_mentioned)
-        notification.reassigned_issue(issue, @u_disabled)
+        issue.assignees = [@u_mentioned]
+        notification.reassigned_issue(issue, @u_disabled, [@u_mentioned])
 
-        expect(issue.assignee).to be @u_mentioned
-        should_email(issue.assignee)
+        expect(issue.assignees.first).to be @u_mentioned
+        should_email(issue.assignees.first)
         should_email(@u_watcher)
         should_email(@u_guest_watcher)
         should_email(@u_guest_custom)
@@ -624,11 +628,11 @@ describe NotificationService, services: true do
       end
 
       it 'emails new assignee' do
-        issue.update_attribute(:assignee, @u_mentioned)
-        notification.reassigned_issue(issue, @u_disabled)
+        issue.assignees = [@u_mentioned]
+        notification.reassigned_issue(issue, @u_disabled, [@u_mentioned])
 
-        expect(issue.assignee).to be @u_mentioned
-        should_email(issue.assignee)
+        expect(issue.assignees.first).to be @u_mentioned
+        should_email(issue.assignees.first)
         should_email(@u_watcher)
         should_email(@u_guest_watcher)
         should_email(@u_guest_custom)
@@ -642,17 +646,17 @@ describe NotificationService, services: true do
       end
 
       it 'does not email new assignee if they are the current user' do
-        issue.update_attribute(:assignee, @u_mentioned)
-        notification.reassigned_issue(issue, @u_mentioned)
+        issue.assignees = [@u_mentioned]
+        notification.reassigned_issue(issue, @u_mentioned, [@u_mentioned])
 
-        expect(issue.assignee).to be @u_mentioned
+        expect(issue.assignees.first).to be @u_mentioned
         should_email(@u_watcher)
         should_email(@u_guest_watcher)
         should_email(@u_guest_custom)
         should_email(@u_participant_mentioned)
         should_email(@subscriber)
         should_email(@u_custom_global)
-        should_not_email(issue.assignee)
+        should_not_email(issue.assignees.first)
         should_not_email(@unsubscriber)
         should_not_email(@u_participating)
         should_not_email(@u_disabled)
@@ -662,7 +666,7 @@ describe NotificationService, services: true do
       it_behaves_like 'participating notifications' do
         let(:participant) { create(:user, username: 'user-participant') }
         let(:issuable) { issue }
-        let(:notification_trigger) { notification.reassigned_issue(issue, @u_disabled) }
+        let(:notification_trigger) { notification.reassigned_issue(issue, @u_disabled, [assignee]) }
       end
     end
 
@@ -705,7 +709,7 @@ describe NotificationService, services: true do
       it "doesn't send email to anyone but subscribers of the given labels" do
         notification.relabeled_issue(issue, [group_label_2, label_2], @u_disabled)
 
-        should_not_email(issue.assignee)
+        should_not_email(issue.assignees.first)
         should_not_email(issue.author)
         should_not_email(@u_watcher)
         should_not_email(@u_guest_watcher)
@@ -729,7 +733,7 @@ describe NotificationService, services: true do
         let(:member) { create(:user) }
         let(:guest) { create(:user) }
         let(:admin) { create(:admin) }
-        let(:confidential_issue) { create(:issue, :confidential, project: project, title: 'Confidential issue', author: author, assignee: assignee) }
+        let(:confidential_issue) { create(:issue, :confidential, project: project, title: 'Confidential issue', author: author, assignees: [assignee]) }
         let!(:label_1) { create(:label, project: project, issues: [confidential_issue]) }
         let!(:label_2) { create(:label, project: project) }
 
@@ -767,7 +771,7 @@ describe NotificationService, services: true do
       it 'sends email to issue assignee and issue author' do
         notification.close_issue(issue, @u_disabled)
 
-        should_email(issue.assignee)
+        should_email(issue.assignees.first)
         should_email(issue.author)
         should_email(@u_watcher)
         should_email(@u_guest_watcher)
@@ -798,7 +802,7 @@ describe NotificationService, services: true do
       it 'sends email to issue notification recipients' do
         notification.reopen_issue(issue, @u_disabled)
 
-        should_email(issue.assignee)
+        should_email(issue.assignees.first)
         should_email(issue.author)
         should_email(@u_watcher)
         should_email(@u_guest_watcher)
@@ -826,7 +830,7 @@ describe NotificationService, services: true do
       it 'sends email to issue notification recipients' do
         notification.issue_moved(issue, new_issue, @u_disabled)
 
-        should_email(issue.assignee)
+        should_email(issue.assignees.first)
         should_email(issue.author)
         should_email(@u_watcher)
         should_email(@u_guest_watcher)
diff --git a/spec/services/projects/autocomplete_service_spec.rb b/spec/services/projects/autocomplete_service_spec.rb
index 7916c2d957c..c198c3eedfc 100644
--- a/spec/services/projects/autocomplete_service_spec.rb
+++ b/spec/services/projects/autocomplete_service_spec.rb
@@ -11,7 +11,7 @@ describe Projects::AutocompleteService, services: true do
       let(:project) { create(:empty_project, :public) }
       let!(:issue) { create(:issue, project: project, title: 'Issue 1') }
       let!(:security_issue_1) { create(:issue, :confidential, project: project, title: 'Security issue 1', author: author) }
-      let!(:security_issue_2) { create(:issue, :confidential, title: 'Security issue 2', project: project, assignee: assignee) }
+      let!(:security_issue_2) { create(:issue, :confidential, title: 'Security issue 2', project: project, assignees: [assignee]) }
 
       it 'does not list project confidential issues for guests' do
         autocomplete = described_class.new(project, nil)
diff --git a/spec/services/projects/propagate_service_template_spec.rb b/spec/services/projects/propagate_service_template_spec.rb
new file mode 100644
index 00000000000..90eff3bbc1e
--- /dev/null
+++ b/spec/services/projects/propagate_service_template_spec.rb
@@ -0,0 +1,103 @@
+require 'spec_helper'
+
+describe Projects::PropagateServiceTemplate, services: true do
+  describe '.propagate' do
+    let!(:service_template) do
+      PushoverService.create(
+        template: true,
+        active: true,
+        properties: {
+          device: 'MyDevice',
+          sound: 'mic',
+          priority: 4,
+          user_key: 'asdf',
+          api_key: '123456789'
+        })
+    end
+
+    let!(:project) { create(:empty_project) }
+
+    it 'creates services for projects' do
+      expect(project.pushover_service).to be_nil
+
+      described_class.propagate(service_template)
+
+      expect(project.reload.pushover_service).to be_present
+    end
+
+    it 'creates services for a project that has another service' do
+      BambooService.create(
+        template: true,
+        active: true,
+        project: project,
+        properties: {
+          bamboo_url: 'http://gitlab.com',
+          username: 'mic',
+          password: "password",
+          build_key: 'build'
+        }
+      )
+
+      expect(project.pushover_service).to be_nil
+
+      described_class.propagate(service_template)
+
+      expect(project.reload.pushover_service).to be_present
+    end
+
+    it 'does not create the service if it exists already' do
+      other_service = BambooService.create(
+        template: true,
+        active: true,
+        properties: {
+          bamboo_url: 'http://gitlab.com',
+          username: 'mic',
+          password: "password",
+          build_key: 'build'
+        }
+      )
+
+      Service.build_from_template(project.id, service_template).save!
+      Service.build_from_template(project.id, other_service).save!
+
+      expect { described_class.propagate(service_template) }.
+        not_to change { Service.count }
+    end
+
+    it 'creates the service containing the template attributes' do
+      described_class.propagate(service_template)
+
+      expect(project.pushover_service.properties).to eq(service_template.properties)
+    end
+
+    describe 'bulk update' do
+      it 'creates services for all projects' do
+        project_total = 5
+        stub_const 'Projects::PropagateServiceTemplate::BATCH_SIZE', 3
+
+        project_total.times { create(:empty_project) }
+
+        expect { described_class.propagate(service_template) }.
+          to change { Service.count }.by(project_total + 1)
+      end
+    end
+
+    describe 'external tracker' do
+      it 'updates the project external tracker' do
+        service_template.update!(category: 'issue_tracker', default: false)
+
+        expect { described_class.propagate(service_template) }.
+          to change { project.reload.has_external_issue_tracker }.to(true)
+      end
+    end
+
+    describe 'external wiki' do
+      it 'updates the project external tracker' do
+        service_template.update!(type: 'ExternalWikiService')
+
+        expect { described_class.propagate(service_template) }.
+          to change { project.reload.has_external_wiki }.to(true)
+      end
+    end
+  end
+end
diff --git a/spec/services/slash_commands/interpret_service_spec.rb b/spec/services/slash_commands/interpret_service_spec.rb
index 46cfac4a128..e5e400ee281 100644
--- a/spec/services/slash_commands/interpret_service_spec.rb
+++ b/spec/services/slash_commands/interpret_service_spec.rb
@@ -3,6 +3,7 @@ require 'spec_helper'
 describe SlashCommands::InterpretService, services: true do
   let(:project) { create(:empty_project, :public) }
   let(:developer) { create(:user) }
+  let(:developer2) { create(:user) }
   let(:issue) { create(:issue, project: project) }
   let(:milestone) { create(:milestone, project: project, title: '9.10') }
   let(:inprogress) { create(:label, project: project, title: 'In Progress') }
@@ -42,23 +43,6 @@ describe SlashCommands::InterpretService, services: true do
       end
     end
 
-    shared_examples 'assign command' do
-      it 'fetches assignee and populates assignee_id if content contains /assign' do
-        _, updates = service.execute(content, issuable)
-
-        expect(updates).to eq(assignee_id: developer.id)
-      end
-    end
-
-    shared_examples 'unassign command' do
-      it 'populates assignee_id: nil if content contains /unassign' do
-        issuable.update!(assignee_id: developer.id)
-        _, updates = service.execute(content, issuable)
-
-        expect(updates).to eq(assignee_id: nil)
-      end
-    end
-
     shared_examples 'milestone command' do
       it 'fetches milestone and populates milestone_id if content contains /milestone' do
         milestone # populate the milestone
@@ -371,14 +355,46 @@ describe SlashCommands::InterpretService, services: true do
       let(:issuable) { issue }
     end
 
-    it_behaves_like 'assign command' do
+    context 'assign command' do
       let(:content) { "/assign @#{developer.username}" }
-      let(:issuable) { issue }
+
+      context 'Issue' do
+        it 'fetches assignee and populates assignee_id if content contains /assign' do
+          _, updates = service.execute(content, issue)
+
+          expect(updates).to eq(assignee_ids: [developer.id])
+        end
+      end
+
+      context 'Merge Request' do
+        it 'fetches assignee and populates assignee_id if content contains /assign' do
+          _, updates = service.execute(content, merge_request)
+
+          expect(updates).to eq(assignee_id: developer.id)
+        end
+      end
     end
 
-    it_behaves_like 'assign command' do
-      let(:content) { "/assign @#{developer.username}" }
-      let(:issuable) { merge_request }
+    context 'assign command with multiple assignees' do
+      let(:content) { "/assign @#{developer.username} @#{developer2.username}" }
+
+      before{ project.team << [developer2, :developer] }
+
+      context 'Issue' do
+        it 'fetches assignee and populates assignee_id if content contains /assign' do
+          _, updates = service.execute(content, issue)
+
+          expect(updates[:assignee_ids]).to match_array([developer.id, developer2.id])
+        end
+      end
+
+      context 'Merge Request' do
+        it 'fetches assignee and populates assignee_id if content contains /assign' do
+          _, updates = service.execute(content, merge_request)
+
+          expect(updates).to eq(assignee_id: developer.id)
+        end
+      end
     end
 
     it_behaves_like 'empty command' do
@@ -391,14 +407,26 @@ describe SlashCommands::InterpretService, services: true do
       let(:issuable) { issue }
     end
 
-    it_behaves_like 'unassign command' do
+    context 'unassign command' do
       let(:content) { '/unassign' }
-      let(:issuable) { issue }
-    end
 
-    it_behaves_like 'unassign command' do
-      let(:content) { '/unassign' }
-      let(:issuable) { merge_request }
+      context 'Issue' do
+        it 'populates assignee_ids: [] if content contains /unassign' do
+          issue.update(assignee_ids: [developer.id])
+          _, updates = service.execute(content, issue)
+
+          expect(updates).to eq(assignee_ids: [])
+        end
+      end
+
+      context 'Merge Request' do
+        it 'populates assignee_id: nil if content contains /unassign' do
+          merge_request.update(assignee_id: developer.id)
+          _, updates = service.execute(content, merge_request)
+
+          expect(updates).to eq(assignee_id: nil)
+        end
+      end
     end
 
     it_behaves_like 'milestone command' do
@@ -846,7 +874,7 @@ describe SlashCommands::InterpretService, services: true do
 
     describe 'unassign command' do
       let(:content) { '/unassign' }
-      let(:issue) { create(:issue, project: project, assignee: developer) }
+      let(:issue) { create(:issue, project: project, assignees: [developer]) }
 
       it 'includes current assignee reference' do
         _, explanations = service.explain(content, issue)
diff --git a/spec/services/system_note_service_spec.rb b/spec/services/system_note_service_spec.rb
index 75d7caf2508..516566eddef 100644
--- a/spec/services/system_note_service_spec.rb
+++ b/spec/services/system_note_service_spec.rb
@@ -6,6 +6,7 @@ describe SystemNoteService, services: true do
   let(:project)  { create(:empty_project) }
   let(:author)   { create(:user) }
   let(:noteable) { create(:issue, project: project) }
+  let(:issue)    { noteable }
 
   shared_examples_for 'a system note' do
     let(:expected_noteable) { noteable }
@@ -155,6 +156,52 @@ describe SystemNoteService, services: true do
     end
   end
 
+  describe '.change_issue_assignees' do
+    subject { described_class.change_issue_assignees(noteable, project, author, [assignee]) }
+
+    let(:assignee) { create(:user) }
+    let(:assignee1) { create(:user) }
+    let(:assignee2) { create(:user) }
+    let(:assignee3) { create(:user) }
+
+    it_behaves_like 'a system note' do
+      let(:action) { 'assignee' }
+    end
+
+    def build_note(old_assignees, new_assignees)
+      issue.assignees = new_assignees
+      described_class.change_issue_assignees(issue, project, author, old_assignees).note
+    end
+
+    it 'builds a correct phrase when an assignee is added to a non-assigned issue' do
+      expect(build_note([], [assignee1])).to eq "assigned to @#{assignee1.username}"
+    end
+
+    it 'builds a correct phrase when assignee removed' do
+      expect(build_note([assignee1], [])).to eq 'removed all assignees'
+    end
+
+    it 'builds a correct phrase when assignees changed' do
+      expect(build_note([assignee1], [assignee2])).to eq \
+        "assigned to @#{assignee2.username} and unassigned @#{assignee1.username}"
+    end
+
+    it 'builds a correct phrase when three assignees removed and one added' do
+      expect(build_note([assignee, assignee1, assignee2], [assignee3])).to eq \
+        "assigned to @#{assignee3.username} and unassigned @#{assignee.username}, @#{assignee1.username}, and @#{assignee2.username}"
+    end
+
+    it 'builds a correct phrase when one assignee changed from a set' do
+      expect(build_note([assignee, assignee1], [assignee, assignee2])).to eq \
+        "assigned to @#{assignee2.username} and unassigned @#{assignee1.username}"
+    end
+
+    it 'builds a correct phrase when one assignee removed from a set' do
+      expect(build_note([assignee, assignee1, assignee2], [assignee, assignee1])).to eq \
+        "unassigned @#{assignee2.username}"
+    end
+  end
+
   describe '.change_label' do
     subject { described_class.change_label(noteable, project, author, added, removed) }
 
@@ -292,6 +339,20 @@ describe SystemNoteService, services: true do
     end
   end
 
+  describe '.change_description' do
+    subject { described_class.change_description(noteable, project, author) }
+
+    context 'when noteable responds to `description`' do
+      it_behaves_like 'a system note' do
+        let(:action) { 'description' }
+      end
+
+      it 'sets the note text' do
+        expect(subject.note).to eq('changed the description')
+      end
+    end
+  end
+
   describe '.change_issue_confidentiality' do
     subject { described_class.change_issue_confidentiality(noteable, project, author) }
 
diff --git a/spec/services/todo_service_spec.rb b/spec/services/todo_service_spec.rb
index 89b3b6aad10..175a42a32d9 100644
--- a/spec/services/todo_service_spec.rb
+++ b/spec/services/todo_service_spec.rb
@@ -25,11 +25,11 @@ describe TodoService, services: true do
   end
 
   describe 'Issues' do
-    let(:issue) { create(:issue, project: project, assignee: john_doe, author: author, description: "- [ ] Task 1\n- [ ] Task 2 #{mentions}") }
-    let(:addressed_issue) { create(:issue, project: project, assignee: john_doe, author: author, description: "#{directly_addressed}\n- [ ] Task 1\n- [ ] Task 2") }
-    let(:unassigned_issue) { create(:issue, project: project, assignee: nil) }
-    let(:confidential_issue) { create(:issue, :confidential, project: project, author: author, assignee: assignee, description: mentions) }
-    let(:addressed_confident_issue) { create(:issue, :confidential, project: project, author: author, assignee: assignee, description: directly_addressed) }
+    let(:issue) { create(:issue, project: project, assignees: [john_doe], author: author, description: "- [ ] Task 1\n- [ ] Task 2 #{mentions}") }
+    let(:addressed_issue) { create(:issue, project: project, assignees: [john_doe], author: author, description: "#{directly_addressed}\n- [ ] Task 1\n- [ ] Task 2") }
+    let(:unassigned_issue) { create(:issue, project: project, assignees: []) }
+    let(:confidential_issue) { create(:issue, :confidential, project: project, author: author, assignees: [assignee], description: mentions) }
+    let(:addressed_confident_issue) { create(:issue, :confidential, project: project, author: author, assignees: [assignee], description: directly_addressed) }
 
     describe '#new_issue' do
       it 'creates a todo if assigned' do
@@ -43,7 +43,7 @@ describe TodoService, services: true do
       end
 
       it 'creates a todo if assignee is the current user' do
-        unassigned_issue.update_attribute(:assignee, john_doe)
+        unassigned_issue.assignees = [john_doe]
         service.new_issue(unassigned_issue, john_doe)
 
         should_create_todo(user: john_doe, target: unassigned_issue, author: john_doe, action: Todo::ASSIGNED)
@@ -258,20 +258,20 @@ describe TodoService, services: true do
 
     describe '#reassigned_issue' do
       it 'creates a pending todo for new assignee' do
-        unassigned_issue.update_attribute(:assignee, john_doe)
+        unassigned_issue.assignees << john_doe
         service.reassigned_issue(unassigned_issue, author)
 
         should_create_todo(user: john_doe, target: unassigned_issue, action: Todo::ASSIGNED)
       end
 
       it 'does not create a todo if unassigned' do
-        issue.update_attribute(:assignee, nil)
+        issue.assignees.destroy_all
 
         should_not_create_any_todo { service.reassigned_issue(issue, author) }
       end
 
       it 'creates a todo if new assignee is the current user' do
-        unassigned_issue.update_attribute(:assignee, john_doe)
+        unassigned_issue.assignees << john_doe
         service.reassigned_issue(unassigned_issue, john_doe)
 
         should_create_todo(user: john_doe, target: unassigned_issue, author: john_doe, action: Todo::ASSIGNED)
@@ -361,7 +361,7 @@ describe TodoService, services: true do
     describe '#new_note' do
       let!(:first_todo) { create(:todo, :assigned, user: john_doe, project: project, target: issue, author: author) }
       let!(:second_todo) { create(:todo, :assigned, user: john_doe, project: project, target: issue, author: author) }
-      let(:confidential_issue) { create(:issue, :confidential, project: project, author: author, assignee: assignee) }
+      let(:confidential_issue) { create(:issue, :confidential, project: project, author: author, assignees: [assignee]) }
       let(:note) { create(:note, project: project, noteable: issue, author: john_doe, note: mentions) }
       let(:addressed_note) { create(:note, project: project, noteable: issue, author: john_doe, note: directly_addressed) }
       let(:note_on_commit) { create(:note_on_commit, project: project, author: john_doe, note: mentions) }
@@ -854,7 +854,7 @@ describe TodoService, services: true do
   end
 
   it 'updates cached counts when a todo is created' do
-    issue = create(:issue, project: project, assignee: john_doe, author: author, description: mentions)
+    issue = create(:issue, project: project, assignees: [john_doe], author: author, description: mentions)
 
     expect(john_doe.todos_pending_count).to eq(0)
     expect(john_doe).to receive(:update_todos_count_cache).and_call_original
@@ -866,8 +866,8 @@ describe TodoService, services: true do
   end
 
   describe '#mark_todos_as_done' do
-    let(:issue) { create(:issue, project: project, author: author, assignee: john_doe) }
-    let(:another_issue) { create(:issue, project: project, author: author, assignee: john_doe) }
+    let(:issue) { create(:issue, project: project, author: author, assignees: [john_doe]) }
+    let(:another_issue) { create(:issue, project: project, author: author, assignees: [john_doe]) }
 
     it 'marks a relation of todos as done' do
       create(:todo, :mentioned, user: john_doe, target: issue, project: project)
diff --git a/spec/services/users/destroy_service_spec.rb b/spec/services/users/destroy_service_spec.rb
index 4bc30018ebd..de37a61e388 100644
--- a/spec/services/users/destroy_service_spec.rb
+++ b/spec/services/users/destroy_service_spec.rb
@@ -47,7 +47,7 @@ describe Users::DestroyService, services: true do
       end
 
       context "for an issue the user was assigned to" do
-        let!(:issue) { create(:issue, project: project, assignee: user) }
+        let!(:issue) { create(:issue, project: project, assignees: [user]) }
 
         before do
           service.execute(user)
@@ -60,7 +60,7 @@ describe Users::DestroyService, services: true do
         it 'migrates the issue so that it is "Unassigned"' do
           migrated_issue = Issue.find_by_id(issue.id)
 
-          expect(migrated_issue.assignee).to be_nil
+          expect(migrated_issue.assignees).to be_empty
         end
       end
     end
diff --git a/spec/support/features/issuable_slash_commands_shared_examples.rb b/spec/support/features/issuable_slash_commands_shared_examples.rb
index 610decdcddb..ad46b163cd6 100644
--- a/spec/support/features/issuable_slash_commands_shared_examples.rb
+++ b/spec/support/features/issuable_slash_commands_shared_examples.rb
@@ -25,7 +25,7 @@ shared_examples 'issuable record that supports slash commands in its description
     wait_for_ajax
   end
 
-  describe "new #{issuable_type}" do
+  describe "new #{issuable_type}", js: true do
     context 'with commands in the description' do
       it "creates the #{issuable_type} and interpret commands accordingly" do
         visit public_send("new_namespace_project_#{issuable_type}_path", project.namespace, project, new_url_opts)
@@ -44,7 +44,7 @@ shared_examples 'issuable record that supports slash commands in its description
     end
   end
 
-  describe "note on #{issuable_type}" do
+  describe "note on #{issuable_type}", js: true do
     before do
       visit public_send("namespace_project_#{issuable_type}_path", project.namespace, project, issuable)
     end
@@ -63,7 +63,7 @@ shared_examples 'issuable record that supports slash commands in its description
         note = issuable.notes.user.first
 
         expect(note.note).to eq "Awesome!"
-        expect(issuable.assignee).to eq assignee
+        expect(issuable.assignees).to eq [assignee]
         expect(issuable.labels).to eq [label_bug]
         expect(issuable.milestone).to eq milestone
       end
@@ -81,7 +81,7 @@ shared_examples 'issuable record that supports slash commands in its description
         issuable.reload
 
         expect(issuable.notes.user).to be_empty
-        expect(issuable.assignee).to eq assignee
+        expect(issuable.assignees).to eq [assignee]
         expect(issuable.labels).to eq [label_bug]
         expect(issuable.milestone).to eq milestone
       end
diff --git a/spec/support/import_export/export_file_helper.rb b/spec/support/import_export/export_file_helper.rb
index 944ea30656f..57b6abe12b7 100644
--- a/spec/support/import_export/export_file_helper.rb
+++ b/spec/support/import_export/export_file_helper.rb
@@ -10,7 +10,7 @@ module ExportFileHelper
 
     create(:release, project: project)
 
-    issue = create(:issue, assignee: user, project: project)
+    issue = create(:issue, assignees: [user], project: project)
     snippet = create(:project_snippet, project: project)
     label = create(:label, project: project)
     milestone = create(:milestone, project: project)
diff --git a/spec/support/matchers/gitlab_git_matchers.rb b/spec/support/matchers/gitlab_git_matchers.rb
new file mode 100644
index 00000000000..c840cd4bf2d
--- /dev/null
+++ b/spec/support/matchers/gitlab_git_matchers.rb
@@ -0,0 +1,6 @@
+RSpec::Matchers.define :gitlab_git_repository_with do |values|
+  match do |actual|
+    actual.is_a?(Gitlab::Git::Repository) &&
+      values.all? { |k, v| actual.send(k) == v }
+  end
+end
diff --git a/spec/support/services/issuable_create_service_shared_examples.rb b/spec/support/services/issuable_create_service_shared_examples.rb
deleted file mode 100644
index 4f0c745b7ee..00000000000
--- a/spec/support/services/issuable_create_service_shared_examples.rb
+++ /dev/null
@@ -1,52 +0,0 @@
-shared_examples 'issuable create service' do
-  context 'asssignee_id' do
-    let(:assignee) { create(:user) }
-
-    before { project.team << [user, :master] }
-
-    it 'removes assignee_id when user id is invalid' do
-      opts = { title: 'Title', description: 'Description', assignee_id: -1 }
-
-      issuable = described_class.new(project, user, opts).execute
-
-      expect(issuable.assignee_id).to be_nil
-    end
-
-    it 'removes assignee_id when user id is 0' do
-      opts = { title: 'Title', description: 'Description',  assignee_id: 0 }
-
-      issuable = described_class.new(project, user, opts).execute
-
-      expect(issuable.assignee_id).to be_nil
-    end
-
-    it 'saves assignee when user id is valid' do
-      project.team << [assignee, :master]
-      opts = { title: 'Title', description: 'Description', assignee_id: assignee.id }
-
-      issuable = described_class.new(project, user, opts).execute
-
-      expect(issuable.assignee_id).to eq(assignee.id)
-    end
-
-    context "when issuable feature is private" do
-      before do
-        project.project_feature.update(issues_access_level: ProjectFeature::PRIVATE,
-                                       merge_requests_access_level: ProjectFeature::PRIVATE)
-      end
-
-      levels = [Gitlab::VisibilityLevel::INTERNAL, Gitlab::VisibilityLevel::PUBLIC]
-
-      levels.each do |level|
-        it "removes not authorized assignee when project is #{Gitlab::VisibilityLevel.level_name(level)}" do
-          project.update(visibility_level: level)
-          opts = { title: 'Title', description: 'Description', assignee_id: assignee.id }
-
-          issuable = described_class.new(project, user, opts).execute
-
-          expect(issuable.assignee_id).to be_nil
-        end
-      end
-    end
-  end
-end
diff --git a/spec/support/services/issuable_create_service_slash_commands_shared_examples.rb b/spec/support/services/issuable_create_service_slash_commands_shared_examples.rb
index 9e9cdf3e48b..1dd3663b944 100644
--- a/spec/support/services/issuable_create_service_slash_commands_shared_examples.rb
+++ b/spec/support/services/issuable_create_service_slash_commands_shared_examples.rb
@@ -49,23 +49,7 @@ shared_examples 'new issuable record that supports slash commands' do
 
     it 'assigns and sets milestone to issuable' do
       expect(issuable).to be_persisted
-      expect(issuable.assignee).to eq(assignee)
-      expect(issuable.milestone).to eq(milestone)
-    end
-  end
-
-  context 'with assignee and milestone in params and command' do
-    let(:example_params) do
-      {
-        assignee: create(:user),
-        milestone_id: 1,
-        description: %(/assign @#{assignee.username}\n/milestone %"#{milestone.name}")
-      }
-    end
-
-    it 'assigns and sets milestone to issuable from command' do
-      expect(issuable).to be_persisted
-      expect(issuable.assignee).to eq(assignee)
+      expect(issuable.assignees).to eq([assignee])
       expect(issuable.milestone).to eq(milestone)
     end
   end
diff --git a/spec/support/services/issuable_update_service_shared_examples.rb b/spec/support/services/issuable_update_service_shared_examples.rb
index 49cea1e608c..8947f20562f 100644
--- a/spec/support/services/issuable_update_service_shared_examples.rb
+++ b/spec/support/services/issuable_update_service_shared_examples.rb
@@ -18,52 +18,4 @@ shared_examples 'issuable update service' do
       end
     end
   end
-
-  context 'asssignee_id' do
-    it 'does not update assignee when assignee_id is invalid' do
-      open_issuable.update(assignee_id: user.id)
-
-      update_issuable(assignee_id: -1)
-
-      expect(open_issuable.reload.assignee).to eq(user)
-    end
-
-    it 'unassigns assignee when user id is 0' do
-      open_issuable.update(assignee_id: user.id)
-
-      update_issuable(assignee_id: 0)
-
-      expect(open_issuable.assignee_id).to be_nil
-    end
-
-    it 'saves assignee when user id is valid' do
-      update_issuable(assignee_id: user.id)
-
-      expect(open_issuable.assignee_id).to eq(user.id)
-    end
-
-    it 'does not update assignee_id when user cannot read issue' do
-      non_member        = create(:user)
-      original_assignee = open_issuable.assignee
-
-      update_issuable(assignee_id: non_member.id)
-
-      expect(open_issuable.assignee_id).to eq(original_assignee.id)
-    end
-
-    context "when issuable feature is private" do
-      levels = [Gitlab::VisibilityLevel::INTERNAL, Gitlab::VisibilityLevel::PUBLIC]
-
-      levels.each do |level|
-        it "does not update with unauthorized assignee when project is #{Gitlab::VisibilityLevel.level_name(level)}" do
-          assignee = create(:user)
-          project.update(visibility_level: level)
-          feature_visibility_attr = :"#{open_issuable.model_name.plural}_access_level"
-          project.project_feature.update_attribute(feature_visibility_attr, ProjectFeature::PRIVATE)
-
-          expect{ update_issuable(assignee_id: assignee) }.not_to change{ open_issuable.assignee }
-        end
-      end
-    end
-  end
 end
diff --git a/spec/support/test_env.rb b/spec/support/test_env.rb
index 0b3c6169c9b..8e31c26591b 100644
--- a/spec/support/test_env.rb
+++ b/spec/support/test_env.rb
@@ -27,6 +27,7 @@ module TestEnv
     'expand-collapse-files'              => '025db92',
     'expand-collapse-lines'              => '238e82d',
     'video'                              => '8879059',
+    'add-balsamiq-file'                  => 'b89b56d',
     'crlf-diff'                          => '5938907',
     'conflict-start'                     => '824be60',
     'conflict-resolvable'                => '1450cd6',
diff --git a/spec/support/time_tracking_shared_examples.rb b/spec/support/time_tracking_shared_examples.rb
index e94e17da7e5..84ef46ffa27 100644
--- a/spec/support/time_tracking_shared_examples.rb
+++ b/spec/support/time_tracking_shared_examples.rb
@@ -37,8 +37,7 @@ shared_examples 'issuable time tracker' do
     submit_time('/estimate 3w 1d 1h')
     submit_time('/remove_estimate')
 
-    wait_for_ajax
-    page.within '#issuable-time-tracker' do
+    page.within '.time-tracking-component-wrap' do
       expect(page).to have_content 'No estimate or time spent'
     end
   end
@@ -47,14 +46,13 @@ shared_examples 'issuable time tracker' do
     submit_time('/spend 3w 1d 1h')
     submit_time('/remove_time_spent')
 
-    wait_for_ajax
-    page.within '#issuable-time-tracker' do
+    page.within '.time-tracking-component-wrap' do
       expect(page).to have_content 'No estimate or time spent'
     end
   end
 
   it 'shows the help state when icon is clicked' do
-    page.within '#issuable-time-tracker' do
+    page.within '.time-tracking-component-wrap' do
       find('.help-button').click
       expect(page).to have_content 'Track time with slash commands'
       expect(page).to have_content 'Learn more'
@@ -62,7 +60,7 @@ shared_examples 'issuable time tracker' do
   end
 
   it 'hides the help state when close icon is clicked' do
-    page.within '#issuable-time-tracker' do
+    page.within '.time-tracking-component-wrap' do
       find('.help-button').click
       find('.close-help-button').click
 
@@ -72,7 +70,7 @@ shared_examples 'issuable time tracker' do
   end
 
   it 'displays the correct help url' do
-    page.within '#issuable-time-tracker' do
+    page.within '.time-tracking-component-wrap' do
       find('.help-button').click
 
       expect(find_link('Learn more')[:href]).to have_content('/help/workflow/time_tracking.md')
diff --git a/spec/views/projects/environments/terminal.html.haml_spec.rb b/spec/views/projects/environments/terminal.html.haml_spec.rb
new file mode 100644
index 00000000000..d2e47225226
--- /dev/null
+++ b/spec/views/projects/environments/terminal.html.haml_spec.rb
@@ -0,0 +1,32 @@
+require 'spec_helper'
+
+describe 'projects/environments/terminal' do
+  let!(:environment) { create(:environment, :with_review_app) }
+
+  before do
+    assign(:environment, environment)
+    assign(:project, environment.project)
+
+    allow(view).to receive(:can?).and_return(true)
+  end
+
+  context 'when environment has external URL' do
+    it 'shows external URL button' do
+      environment.update_attribute(:external_url, 'https://gitlab.com')
+
+      render
+
+      expect(rendered).to have_link(nil, href: 'https://gitlab.com')
+    end
+  end
+
+  context 'when environment does not have external URL' do
+    it 'shows external URL button' do
+      environment.update_attribute(:external_url, nil)
+
+      render
+
+      expect(rendered).not_to have_link(nil, href: 'https://gitlab.com')
+    end
+  end
+end
diff --git a/spec/views/projects/notes/_form.html.haml_spec.rb b/spec/views/shared/notes/_form.html.haml_spec.rb
index a364f9bce92..d7d0a5bf56a 100644
--- a/spec/views/projects/notes/_form.html.haml_spec.rb
+++ b/spec/views/shared/notes/_form.html.haml_spec.rb
@@ -1,6 +1,6 @@
 require 'spec_helper'
 
-describe 'projects/notes/_form' do
+describe 'shared/notes/_form' do
   include Devise::Test::ControllerHelpers
 
   let(:user) { create(:user) }
diff --git a/spec/workers/post_receive_spec.rb b/spec/workers/post_receive_spec.rb
index 32f3cff0ee6..a546ef08d97 100644
--- a/spec/workers/post_receive_spec.rb
+++ b/spec/workers/post_receive_spec.rb
@@ -4,6 +4,8 @@ describe PostReceive do
   let(:changes) { "123456 789012 refs/heads/tést\n654321 210987 refs/tags/tag" }
   let(:wrongly_encoded_changes) { changes.encode("ISO-8859-1").force_encoding("UTF-8") }
   let(:base64_changes) { Base64.encode64(wrongly_encoded_changes) }
+  let(:project) { create(:project, :repository) }
+  let(:project_identifier) { "project-#{project.id}" }
   let(:key) { create(:key, user: project.owner) }
   let(:key_id) { key.shell_id }
 
@@ -17,6 +19,26 @@ describe PostReceive do
     end
   end
 
+  context 'with a non-existing project' do
+    let(:project_identifier) { "project-123456789" }
+    let(:error_message) do
+      "Triggered hook for non-existing project with identifier \"#{project_identifier}\""
+    end
+
+    it "returns false and logs an error" do
+      expect(Gitlab::GitLogger).to receive(:error).with("POST-RECEIVE: #{error_message}")
+      expect(described_class.new.perform(project_identifier, key_id, base64_changes)).to be(false)
+    end
+  end
+
+  context "with an absolute path as the project identifier" do
+    it "searches the project by full path" do
+      expect(Project).to receive(:find_by_full_path).with(project.full_path).and_call_original
+
+      described_class.new.perform(pwd(project), key_id, base64_changes)
+    end
+  end
+
   describe "#process_project_changes" do
     before do
       allow_any_instance_of(Gitlab::GitPostReceive).to receive(:identify).and_return(project.owner)
@@ -28,7 +50,7 @@ describe PostReceive do
       it "calls GitTagPushService" do
         expect_any_instance_of(GitPushService).to receive(:execute).and_return(true)
         expect_any_instance_of(GitTagPushService).not_to receive(:execute)
-        described_class.new.perform(pwd(project), key_id, base64_changes)
+        described_class.new.perform(project_identifier, key_id, base64_changes)
       end
     end
 
@@ -38,7 +60,7 @@ describe PostReceive do
       it "calls GitTagPushService" do
         expect_any_instance_of(GitPushService).not_to receive(:execute)
         expect_any_instance_of(GitTagPushService).to receive(:execute).and_return(true)
-        described_class.new.perform(pwd(project), key_id, base64_changes)
+        described_class.new.perform(project_identifier, key_id, base64_changes)
       end
     end
 
@@ -48,12 +70,12 @@ describe PostReceive do
       it "does not call any of the services" do
         expect_any_instance_of(GitPushService).not_to receive(:execute)
         expect_any_instance_of(GitTagPushService).not_to receive(:execute)
-        described_class.new.perform(pwd(project), key_id, base64_changes)
+        described_class.new.perform(project_identifier, key_id, base64_changes)
       end
     end
 
     context "gitlab-ci.yml" do
-      subject { described_class.new.perform(pwd(project), key_id, base64_changes) }
+      subject { described_class.new.perform(project_identifier, key_id, base64_changes) }
 
       context "creates a Ci::Pipeline for every change" do
         before do
@@ -77,8 +99,8 @@ describe PostReceive do
 
   context "webhook" do
     it "fetches the correct project" do
-      expect(Project).to receive(:find_by_full_path).with(project.path_with_namespace).and_return(project)
-      described_class.new.perform(pwd(project), key_id, base64_changes)
+      expect(Project).to receive(:find_by).with(id: project.id.to_s)
+      described_class.new.perform(project_identifier, key_id, base64_changes)
     end
 
     it "does not run if the author is not in the project" do
@@ -88,26 +110,26 @@ describe PostReceive do
 
       expect(project).not_to receive(:execute_hooks)
 
-      expect(described_class.new.perform(pwd(project), key_id, base64_changes)).to be_falsey
+      expect(described_class.new.perform(project_identifier, key_id, base64_changes)).to be_falsey
     end
 
     it "asks the project to trigger all hooks" do
-      allow(Project).to receive(:find_by_full_path).and_return(project)
+      allow(Project).to receive(:find_by).and_return(project)
       expect(project).to receive(:execute_hooks).twice
       expect(project).to receive(:execute_services).twice
 
-      described_class.new.perform(pwd(project), key_id, base64_changes)
+      described_class.new.perform(project_identifier, key_id, base64_changes)
     end
 
     it "enqueues a UpdateMergeRequestsWorker job" do
-      allow(Project).to receive(:find_by_full_path).and_return(project)
+      allow(Project).to receive(:find_by).and_return(project)
       expect(UpdateMergeRequestsWorker).to receive(:perform_async).with(project.id, project.owner.id, any_args)
 
-      described_class.new.perform(pwd(project), key_id, base64_changes)
+      described_class.new.perform(project_identifier, key_id, base64_changes)
     end
   end
 
   def pwd(project)
     File.join(Gitlab.config.repositories.storages.default['path'], project.path_with_namespace)
   end
-end
+end
\ No newline at end of file
diff --git a/spec/workers/propagate_service_template_worker_spec.rb b/spec/workers/propagate_service_template_worker_spec.rb
new file mode 100644
index 00000000000..7040d5ef81c
--- /dev/null
+++ b/spec/workers/propagate_service_template_worker_spec.rb
@@ -0,0 +1,29 @@
+require 'spec_helper'
+
+describe PropagateServiceTemplateWorker do
+  let!(:service_template) do
+    PushoverService.create(
+      template: true,
+      active: true,
+      properties: {
+        device: 'MyDevice',
+        sound: 'mic',
+        priority: 4,
+        user_key: 'asdf',
+        api_key: '123456789'
+      })
+  end
+
+  before do
+    allow_any_instance_of(Gitlab::ExclusiveLease).to receive(:try_obtain).
+      and_return(true)
+  end
+
+  describe '#perform' do
+    it 'calls the propagate service with the template' do
+      expect(Projects::PropagateServiceTemplate).to receive(:propagate).with(service_template)
+
+      subject.perform(service_template.id)
+    end
+  end
+end
diff --git a/yarn.lock b/yarn.lock
index 8c72f36af3a..8aac2b1b1cd 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3190,7 +3190,7 @@ json-stable-stringify@^1.0.0, json-stable-stringify@^1.0.1:
   dependencies:
     jsonify "~0.0.0"
 
-json-stringify-safe@~5.0.1:
+json-stringify-safe@^5.0.1, json-stringify-safe@~5.0.1:
   version "5.0.1"
   resolved "https://registry.yarnpkg.com/json-stringify-safe/-/json-stringify-safe-5.0.1.tgz#1296a2d58fd45f19a0f6ce01d65701e2c735b6eb"
 
@@ -4584,6 +4584,12 @@ raphael@^2.2.7:
   dependencies:
     eve-raphael "0.5.0"
 
+raven-js@^3.14.0:
+  version "3.14.0"
+  resolved "https://registry.yarnpkg.com/raven-js/-/raven-js-3.14.0.tgz#94dda81d975fdc4a42f193db437cf70021d654e0"
+  dependencies:
+    json-stringify-safe "^5.0.1"
+
 raw-body@~2.2.0:
   version "2.2.0"
   resolved "https://registry.yarnpkg.com/raw-body/-/raw-body-2.2.0.tgz#994976cf6a5096a41162840492f0bdc5d6e7fb96"
@@ -5195,6 +5201,10 @@ sprintf-js@~1.0.2:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/sprintf-js/-/sprintf-js-1.0.3.tgz#04e6926f662895354f3dd015203633b857297e2c"
 
+sql.js@^0.4.0:
+  version "0.4.0"
+  resolved "https://registry.yarnpkg.com/sql.js/-/sql.js-0.4.0.tgz#23be9635520eb0ff43a741e7e830397266e88445"
+
 sshpk@^1.7.0:
   version "1.10.2"
   resolved "https://registry.yarnpkg.com/sshpk/-/sshpk-1.10.2.tgz#d5a804ce22695515638e798dbe23273de070a5fa"