Merge branch 'master' into triggermesh-phase1-knative

86 files changed, 974 insertions, 399 deletions

diff --git a/app/assets/javascripts/boards/models/issue.js b/app/assets/javascripts/boards/models/issue.js
index bb3b2865934..669630edcab 100644
--- a/app/assets/javascripts/boards/models/issue.js
+++ b/app/assets/javascripts/boards/models/issue.js
@@ -30,6 +30,7 @@ class ListIssue {
     this.toggleSubscriptionEndpoint = obj.toggle_subscription_endpoint;
     this.milestone_id = obj.milestone_id;
     this.project_id = obj.project_id;
+    this.assignableLabelsEndpoint = obj.assignable_labels_endpoint;
 
     if (obj.project) {
       this.project = new IssueProject(obj.project);
diff --git a/app/assets/javascripts/commit/pipelines/pipelines_table.vue b/app/assets/javascripts/commit/pipelines/pipelines_table.vue
index a2aa3d197e3..82532539c9c 100644
--- a/app/assets/javascripts/commit/pipelines/pipelines_table.vue
+++ b/app/assets/javascripts/commit/pipelines/pipelines_table.vue
@@ -2,9 +2,15 @@
 import PipelinesService from '../../pipelines/services/pipelines_service';
 import PipelineStore from '../../pipelines/stores/pipelines_store';
 import pipelinesMixin from '../../pipelines/mixins/pipelines';
+import TablePagination from '../../vue_shared/components/table_pagination.vue';
+import { getParameterByName } from '../../lib/utils/common_utils';
+import CIPaginationMixin from '../../vue_shared/mixins/ci_pagination_api_mixin';
 
 export default {
-  mixins: [pipelinesMixin],
+  components: {
+    TablePagination,
+  },
+  mixins: [pipelinesMixin, CIPaginationMixin],
   props: {
     endpoint: {
       type: String,
@@ -35,6 +41,8 @@ export default {
     return {
       store,
       state: store.state,
+      page: getParameterByName('page') || '1',
+      requestData: {},
     };
   },
 
@@ -48,11 +56,14 @@ export default {
   },
   created() {
     this.service = new PipelinesService(this.endpoint);
+    this.requestData = { page: this.page };
   },
   methods: {
     successCallback(resp) {
       // depending of the endpoint the response can either bring a `pipelines` key or not.
       const pipelines = resp.data.pipelines || resp.data;
+
+      this.store.storePagination(resp.headers);
       this.setCommonData(pipelines);
 
       const updatePipelinesEvent = new CustomEvent('update-pipelines-count', {
@@ -97,5 +108,11 @@ export default {
         :view-type="viewType"
       />
     </div>
+
+    <table-pagination
+      v-if="shouldRenderPagination"
+      :change="onChangePage"
+      :page-info="state.pageInfo"
+    />
   </div>
 </template>
diff --git a/app/assets/javascripts/commons/gitlab_ui.js b/app/assets/javascripts/commons/gitlab_ui.js
index e93e1f5ea2c..82a191d056b 100644
--- a/app/assets/javascripts/commons/gitlab_ui.js
+++ b/app/assets/javascripts/commons/gitlab_ui.js
@@ -1,7 +1,6 @@
 import Vue from 'vue';
-import { GlProgressBar, GlLoadingIcon, GlTooltipDirective } from '@gitlab-org/gitlab-ui';
+import { GlLoadingIcon, GlTooltipDirective } from '@gitlab-org/gitlab-ui';
 
-Vue.component('gl-progress-bar', GlProgressBar);
 Vue.component('gl-loading-icon', GlLoadingIcon);
 
 Vue.directive('gl-tooltip', GlTooltipDirective);
diff --git a/app/assets/javascripts/labels_select.js b/app/assets/javascripts/labels_select.js
index 5457604b3b9..c0a76814102 100644
--- a/app/assets/javascripts/labels_select.js
+++ b/app/assets/javascripts/labels_select.js
@@ -59,7 +59,6 @@ export default class LabelsSelect {
       $toggleText = $dropdown.find('.dropdown-toggle-text');
       namespacePath = $dropdown.data('namespacePath');
       projectPath = $dropdown.data('projectPath');
-      labelUrl = $dropdown.data('labels');
       issueUpdateURL = $dropdown.data('issueUpdate');
       selectedLabel = $dropdown.data('selected');
       if (selectedLabel != null && !$dropdown.hasClass('js-multiselect')) {
@@ -168,6 +167,7 @@ export default class LabelsSelect {
       $dropdown.glDropdown({
         showMenuAbove: showMenuAbove,
         data: function(term, callback) {
+          labelUrl = $dropdown.attr('data-labels');
           axios
             .get(labelUrl)
             .then(res => {
diff --git a/app/assets/javascripts/pages/projects/clusters/gcp/new/index.js b/app/assets/javascripts/pages/projects/clusters/gcp/new/index.js
deleted file mode 100644
index d4f34e32a48..00000000000
--- a/app/assets/javascripts/pages/projects/clusters/gcp/new/index.js
+++ /dev/null
@@ -1,5 +0,0 @@
-import initGkeDropdowns from '~/projects/gke_cluster_dropdowns';
-
-document.addEventListener('DOMContentLoaded', () => {
-  initGkeDropdowns();
-});
diff --git a/app/assets/javascripts/pipelines/components/pipelines.vue b/app/assets/javascripts/pipelines/components/pipelines.vue
index ea526cf1309..fcd8a54c9c1 100644
--- a/app/assets/javascripts/pipelines/components/pipelines.vue
+++ b/app/assets/javascripts/pipelines/components/pipelines.vue
@@ -155,14 +155,6 @@ export default {
       );
     },
 
-    shouldRenderPagination() {
-      return (
-        !this.isLoading &&
-        this.state.pipelines.length &&
-        this.state.pageInfo.total > this.state.pageInfo.perPage
-      );
-    },
-
     emptyTabMessage() {
       const { scopes } = this.$options;
       const possibleScopes = [scopes.pending, scopes.running, scopes.finished];
@@ -232,36 +224,6 @@ export default {
         this.setCommonData(resp.data.pipelines);
       }
     },
-    /**
-     * Handles URL and query parameter changes.
-     * When the user uses the pagination or the tabs,
-     *  - update URL
-     *  - Make API request to the server with new parameters
-     *  - Update the polling function
-     *  - Update the internal state
-     */
-    updateContent(parameters) {
-      this.updateInternalState(parameters);
-
-      // fetch new data
-      return this.service
-        .getPipelines(this.requestData)
-        .then(response => {
-          this.isLoading = false;
-          this.successCallback(response);
-
-          // restart polling
-          this.poll.restart({ data: this.requestData });
-        })
-        .catch(() => {
-          this.isLoading = false;
-          this.errorCallback();
-
-          // restart polling
-          this.poll.restart({ data: this.requestData });
-        });
-    },
-
     handleResetRunnersCache(endpoint) {
       this.isResetCacheButtonLoading = true;
 
diff --git a/app/assets/javascripts/pipelines/mixins/pipelines.js b/app/assets/javascripts/pipelines/mixins/pipelines.js
index 8929b397f6c..85781f548c6 100644
--- a/app/assets/javascripts/pipelines/mixins/pipelines.js
+++ b/app/assets/javascripts/pipelines/mixins/pipelines.js
@@ -23,6 +23,15 @@ export default {
       hasMadeRequest: false,
     };
   },
+  computed: {
+    shouldRenderPagination() {
+      return (
+        !this.isLoading &&
+        this.state.pipelines.length &&
+        this.state.pageInfo.total > this.state.pageInfo.perPage
+      );
+    },
+  },
   beforeMount() {
     this.poll = new Poll({
       resource: this.service,
@@ -65,6 +74,35 @@ export default {
     this.poll.stop();
   },
   methods: {
+    /**
+     * Handles URL and query parameter changes.
+     * When the user uses the pagination or the tabs,
+     *  - update URL
+     *  - Make API request to the server with new parameters
+     *  - Update the polling function
+     *  - Update the internal state
+     */
+    updateContent(parameters) {
+      this.updateInternalState(parameters);
+
+      // fetch new data
+      return this.service
+        .getPipelines(this.requestData)
+        .then(response => {
+          this.isLoading = false;
+          this.successCallback(response);
+
+          // restart polling
+          this.poll.restart({ data: this.requestData });
+        })
+        .catch(() => {
+          this.isLoading = false;
+          this.errorCallback();
+
+          // restart polling
+          this.poll.restart({ data: this.requestData });
+        });
+    },
     updateTable() {
       // Cancel ongoing request
       if (this.isMakingRequest) {
diff --git a/app/assets/javascripts/sidebar/components/time_tracking/comparison_pane.vue b/app/assets/javascripts/sidebar/components/time_tracking/comparison_pane.vue
index e74912d628f..b145e5dc5e2 100644
--- a/app/assets/javascripts/sidebar/components/time_tracking/comparison_pane.vue
+++ b/app/assets/javascripts/sidebar/components/time_tracking/comparison_pane.vue
@@ -1,9 +1,13 @@
 <script>
 import { parseSeconds, stringifyTime } from '~/lib/utils/datetime_utility';
 import tooltip from '../../../vue_shared/directives/tooltip';
+import { GlProgressBar } from '@gitlab-org/gitlab-ui';
 
 export default {
   name: 'TimeTrackingComparisonPane',
+  components: {
+    GlProgressBar,
+  },
   directives: {
     tooltip,
   },
diff --git a/app/assets/javascripts/vue_shared/components/markdown/header.vue b/app/assets/javascripts/vue_shared/components/markdown/header.vue
index 3ddb39730c4..27e3f314dd3 100644
--- a/app/assets/javascripts/vue_shared/components/markdown/header.vue
+++ b/app/assets/javascripts/vue_shared/components/markdown/header.vue
@@ -1,17 +1,17 @@
 <script>
 import $ from 'jquery';
-import Tooltip from '../../directives/tooltip';
+import { GlTooltipDirective } from '@gitlab-org/gitlab-ui';
 import ToolbarButton from './toolbar_button.vue';
 import Icon from '../icon.vue';
 
 export default {
-  directives: {
-    Tooltip,
-  },
   components: {
     ToolbarButton,
     Icon,
   },
+  directives: {
+    GlTooltip: GlTooltipDirective,
+  },
   props: {
     previewMarkdown: {
       type: Boolean,
@@ -147,7 +147,7 @@ export default {
           icon="table"
         />
         <button
-          v-tooltip
+          v-gl-tooltip
           aria-label="Go full screen"
           class="toolbar-btn toolbar-fullscreen-btn js-zen-enter"
           data-container="body"
diff --git a/app/assets/javascripts/vue_shared/components/markdown/toolbar_button.vue b/app/assets/javascripts/vue_shared/components/markdown/toolbar_button.vue
index 3e89e1c1e75..91d0bbfc21c 100644
--- a/app/assets/javascripts/vue_shared/components/markdown/toolbar_button.vue
+++ b/app/assets/javascripts/vue_shared/components/markdown/toolbar_button.vue
@@ -1,13 +1,13 @@
 <script>
-import tooltip from '../../directives/tooltip';
-import icon from '../icon.vue';
+import { GlTooltipDirective } from '@gitlab-org/gitlab-ui';
+import Icon from '../icon.vue';
 
 export default {
   components: {
-    icon,
+    Icon,
   },
   directives: {
-    tooltip,
+    GlTooltip: GlTooltipDirective,
   },
   props: {
     buttonTitle: {
@@ -43,7 +43,7 @@ export default {
 
 <template>
   <button
-    v-tooltip
+    v-gl-tooltip
     :data-md-tag="tag"
     :data-md-select="tagSelect"
     :data-md-block="tagBlock"
diff --git a/app/assets/javascripts/vue_shared/mixins/ci_pagination_api_mixin.js b/app/assets/javascripts/vue_shared/mixins/ci_pagination_api_mixin.js
index 67a1632269e..f9e3f3df0cc 100644
--- a/app/assets/javascripts/vue_shared/mixins/ci_pagination_api_mixin.js
+++ b/app/assets/javascripts/vue_shared/mixins/ci_pagination_api_mixin.js
@@ -14,7 +14,14 @@ export default {
 
     onChangePage(page) {
       /* URLS parameters are strings, we need to parse to match types */
-      this.updateContent({ scope: this.scope, page: Number(page).toString() });
+      const params = {
+        page: Number(page).toString(),
+      };
+
+      if (this.scope) {
+        params.scope = this.scope;
+      }
+      this.updateContent(params);
     },
 
     updateInternalState(parameters) {
diff --git a/app/controllers/clusters/applications_controller.rb b/app/controllers/clusters/applications_controller.rb
new file mode 100644
index 00000000000..250f42f3096
--- /dev/null
+++ b/app/controllers/clusters/applications_controller.rb
@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+
+class Clusters::ApplicationsController < Clusters::BaseController
+  before_action :cluster
+  before_action :authorize_create_cluster!, only: [:create]
+
+  def create
+    Clusters::Applications::CreateService
+      .new(@cluster, current_user, create_cluster_application_params)
+      .execute(request)
+
+    head :no_content
+  rescue Clusters::Applications::CreateService::InvalidApplicationError
+    render_404
+  rescue StandardError
+    head :bad_request
+  end
+
+  private
+
+  def cluster
+    @cluster ||= clusterable.clusters.find(params[:id]) || render_404
+  end
+
+  def create_cluster_application_params
+    params.permit(:application, :hostname)
+  end
+end
diff --git a/app/controllers/clusters/base_controller.rb b/app/controllers/clusters/base_controller.rb
new file mode 100644
index 00000000000..ef42f7c4074
--- /dev/null
+++ b/app/controllers/clusters/base_controller.rb
@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+class Clusters::BaseController < ApplicationController
+  include RoutableActions
+
+  skip_before_action :authenticate_user!
+  before_action :authorize_read_cluster!
+
+  helper_method :clusterable
+
+  private
+
+  def cluster
+    @cluster ||= clusterable.clusters.find(params[:id])
+                                 .present(current_user: current_user)
+  end
+
+  def authorize_update_cluster!
+    access_denied! unless can?(current_user, :update_cluster, cluster)
+  end
+
+  def authorize_admin_cluster!
+    access_denied! unless can?(current_user, :admin_cluster, cluster)
+  end
+
+  def authorize_read_cluster!
+    access_denied! unless can?(current_user, :read_cluster, clusterable)
+  end
+
+  def authorize_create_cluster!
+    access_denied! unless can?(current_user, :create_cluster, clusterable)
+  end
+
+  def clusterable
+    raise NotImplementedError
+  end
+end
diff --git a/app/controllers/clusters/clusters_controller.rb b/app/controllers/clusters/clusters_controller.rb
new file mode 100644
index 00000000000..f6f2060ebb5
--- /dev/null
+++ b/app/controllers/clusters/clusters_controller.rb
@@ -0,0 +1,218 @@
+# frozen_string_literal: true
+
+class Clusters::ClustersController < Clusters::BaseController
+  include RoutableActions
+
+  before_action :cluster, except: [:index, :new, :create_gcp, :create_user]
+  before_action :generate_gcp_authorize_url, only: [:new]
+  before_action :validate_gcp_token, only: [:new]
+  before_action :gcp_cluster, only: [:new]
+  before_action :user_cluster, only: [:new]
+  before_action :authorize_create_cluster!, only: [:new]
+  before_action :authorize_update_cluster!, only: [:update]
+  before_action :authorize_admin_cluster!, only: [:destroy]
+  before_action :update_applications_status, only: [:cluster_status]
+
+  helper_method :token_in_session
+
+  STATUS_POLLING_INTERVAL = 10_000
+
+  def index
+    clusters = ClustersFinder.new(clusterable, current_user, :all).execute
+    @clusters = clusters.page(params[:page]).per(20)
+  end
+
+  def new
+  end
+
+  # Overridding ActionController::Metal#status is NOT a good idea
+  def cluster_status
+    respond_to do |format|
+      format.json do
+        Gitlab::PollingInterval.set_header(response, interval: STATUS_POLLING_INTERVAL)
+
+        render json: ClusterSerializer
+          .new(current_user: @current_user)
+          .represent_status(@cluster)
+      end
+    end
+  end
+
+  def show
+  end
+
+  def update
+    Clusters::UpdateService
+      .new(current_user, update_params)
+      .execute(cluster)
+
+    if cluster.valid?
+      respond_to do |format|
+        format.json do
+          head :no_content
+        end
+        format.html do
+          flash[:notice] = _('Kubernetes cluster was successfully updated.')
+          redirect_to cluster.show_path
+        end
+      end
+    else
+      respond_to do |format|
+        format.json { head :bad_request }
+        format.html { render :show }
+      end
+    end
+  end
+
+  def destroy
+    if cluster.destroy
+      flash[:notice] = _('Kubernetes cluster integration was successfully removed.')
+      redirect_to clusterable.index_path, status: :found
+    else
+      flash[:notice] = _('Kubernetes cluster integration was not removed.')
+      render :show
+    end
+  end
+
+  def create_gcp
+    @gcp_cluster = ::Clusters::CreateService
+      .new(current_user, create_gcp_cluster_params)
+      .execute(access_token: token_in_session)
+      .present(current_user: current_user)
+
+    if @gcp_cluster.persisted?
+      redirect_to @gcp_cluster.show_path
+    else
+      generate_gcp_authorize_url
+      validate_gcp_token
+      user_cluster
+
+      render :new, locals: { active_tab: 'gcp' }
+    end
+  end
+
+  def create_user
+    @user_cluster = ::Clusters::CreateService
+      .new(current_user, create_user_cluster_params)
+      .execute(access_token: token_in_session)
+      .present(current_user: current_user)
+
+    if @user_cluster.persisted?
+      redirect_to @user_cluster.show_path
+    else
+      generate_gcp_authorize_url
+      validate_gcp_token
+      gcp_cluster
+
+      render :new, locals: { active_tab: 'user' }
+    end
+  end
+
+  private
+
+  def update_params
+    if cluster.managed?
+      params.require(:cluster).permit(
+        :enabled,
+        :environment_scope,
+        platform_kubernetes_attributes: [
+          :namespace
+        ]
+      )
+    else
+      params.require(:cluster).permit(
+        :enabled,
+        :name,
+        :environment_scope,
+        platform_kubernetes_attributes: [
+          :api_url,
+          :token,
+          :ca_cert,
+          :namespace
+        ]
+      )
+    end
+  end
+
+  def create_gcp_cluster_params
+    params.require(:cluster).permit(
+      :enabled,
+      :name,
+      :environment_scope,
+      provider_gcp_attributes: [
+        :gcp_project_id,
+        :zone,
+        :num_nodes,
+        :machine_type,
+        :legacy_abac
+      ]).merge(
+        provider_type: :gcp,
+        platform_type: :kubernetes,
+        clusterable: clusterable.subject
+      )
+  end
+
+  def create_user_cluster_params
+    params.require(:cluster).permit(
+      :enabled,
+      :name,
+      :environment_scope,
+      platform_kubernetes_attributes: [
+        :namespace,
+        :api_url,
+        :token,
+        :ca_cert,
+        :authorization_type
+      ]).merge(
+        provider_type: :user,
+        platform_type: :kubernetes,
+        clusterable: clusterable.subject
+      )
+  end
+
+  def generate_gcp_authorize_url
+    state = generate_session_key_redirect(clusterable.new_path.to_s)
+
+    @authorize_url = GoogleApi::CloudPlatform::Client.new(
+      nil, callback_google_api_auth_url,
+      state: state).authorize_url
+  rescue GoogleApi::Auth::ConfigMissingError
+    # no-op
+  end
+
+  def gcp_cluster
+    @gcp_cluster = ::Clusters::Cluster.new.tap do |cluster|
+      cluster.build_provider_gcp
+    end
+  end
+
+  def user_cluster
+    @user_cluster = ::Clusters::Cluster.new.tap do |cluster|
+      cluster.build_platform_kubernetes
+    end
+  end
+
+  def validate_gcp_token
+    @valid_gcp_token = GoogleApi::CloudPlatform::Client.new(token_in_session, nil)
+      .validate_token(expires_at_in_session)
+  end
+
+  def token_in_session
+    session[GoogleApi::CloudPlatform::Client.session_key_for_token]
+  end
+
+  def expires_at_in_session
+    @expires_at_in_session ||=
+      session[GoogleApi::CloudPlatform::Client.session_key_for_expires_at]
+  end
+
+  def generate_session_key_redirect(uri)
+    GoogleApi::CloudPlatform::Client.new_session_key_for_redirect_uri do |key|
+      session[key] = uri
+    end
+  end
+
+  def update_applications_status
+    @cluster.applications.each(&:schedule_status_update)
+  end
+end
diff --git a/app/controllers/concerns/project_unauthorized.rb b/app/controllers/concerns/project_unauthorized.rb
new file mode 100644
index 00000000000..f59440dbc59
--- /dev/null
+++ b/app/controllers/concerns/project_unauthorized.rb
@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+module ProjectUnauthorized
+  extend ActiveSupport::Concern
+
+  # EE would override this
+  def project_unauthorized_proc
+    # no-op
+  end
+end
diff --git a/app/controllers/concerns/routable_actions.rb b/app/controllers/concerns/routable_actions.rb
index 88939b002b2..5624eb3aa45 100644
--- a/app/controllers/concerns/routable_actions.rb
+++ b/app/controllers/concerns/routable_actions.rb
@@ -3,23 +3,25 @@
 module RoutableActions
   extend ActiveSupport::Concern
 
-  def find_routable!(routable_klass, requested_full_path, extra_authorization_proc: nil)
+  def find_routable!(routable_klass, requested_full_path, extra_authorization_proc: nil, not_found_or_authorized_proc: nil)
     routable = routable_klass.find_by_full_path(requested_full_path, follow_redirects: request.get?)
     if routable_authorized?(routable, extra_authorization_proc)
       ensure_canonical_path(routable, requested_full_path)
       routable
     else
-      handle_not_found_or_authorized(routable)
+      if not_found_or_authorized_proc
+        not_found_or_authorized_proc.call(routable)
+      end
+
+      route_not_found unless performed?
+
       nil
     end
   end
 
-  # This is overridden in gitlab-ee.
-  def handle_not_found_or_authorized(_routable)
-    route_not_found
-  end
-
   def routable_authorized?(routable, extra_authorization_proc)
+    return false unless routable
+
     action = :"read_#{routable.class.to_s.underscore}"
     return false unless can?(current_user, action, routable)
 
diff --git a/app/controllers/projects/application_controller.rb b/app/controllers/projects/application_controller.rb
index a2bdcaefa9b..e0677ce3fbc 100644
--- a/app/controllers/projects/application_controller.rb
+++ b/app/controllers/projects/application_controller.rb
@@ -3,6 +3,7 @@
 class Projects::ApplicationController < ApplicationController
   include CookiesHelper
   include RoutableActions
+  include ProjectUnauthorized
   include ChecksCollaboration
 
   skip_before_action :authenticate_user!
@@ -21,7 +22,7 @@ class Projects::ApplicationController < ApplicationController
     path = File.join(params[:namespace_id], params[:project_id] || params[:id])
     auth_proc = ->(project) { !project.pending_delete? }
 
-    @project = find_routable!(Project, path, extra_authorization_proc: auth_proc)
+    @project = find_routable!(Project, path, extra_authorization_proc: auth_proc, not_found_or_authorized_proc: project_unauthorized_proc)
   end
 
   def build_canonical_path(project)
diff --git a/app/controllers/projects/clusters/applications_controller.rb b/app/controllers/projects/clusters/applications_controller.rb
index bcea96bce94..c7b6218d007 100644
--- a/app/controllers/projects/clusters/applications_controller.rb
+++ b/app/controllers/projects/clusters/applications_controller.rb
@@ -1,29 +1,17 @@
 # frozen_string_literal: true
 
-class Projects::Clusters::ApplicationsController < Projects::ApplicationController
-  before_action :cluster
-  before_action :authorize_read_cluster!
-  before_action :authorize_create_cluster!, only: [:create]
+class Projects::Clusters::ApplicationsController < Clusters::ApplicationsController
+  include ProjectUnauthorized
 
-  def create
-    Clusters::Applications::CreateService
-      .new(@cluster, current_user, create_cluster_application_params)
-      .execute(request)
-
-    head :no_content
-  rescue Clusters::Applications::CreateService::InvalidApplicationError
-    render_404
-  rescue StandardError
-    head :bad_request
-  end
+  prepend_before_action :project
 
   private
 
-  def cluster
-    @cluster ||= project.clusters.find(params[:id]) || render_404
+  def clusterable
+    @clusterable ||= ClusterablePresenter.fabricate(project, current_user: current_user)
   end
 
-  def create_cluster_application_params
-    params.permit(:application, :hostname)
+  def project
+    @project ||= find_routable!(Project, File.join(params[:namespace_id], params[:project_id]), not_found_or_authorized_proc: project_unauthorized_proc)
   end
 end
diff --git a/app/controllers/projects/clusters_controller.rb b/app/controllers/projects/clusters_controller.rb
index 62adc66fb09..feda6deeaa6 100644
--- a/app/controllers/projects/clusters_controller.rb
+++ b/app/controllers/projects/clusters_controller.rb
@@ -1,224 +1,24 @@
 # frozen_string_literal: true
 
-class Projects::ClustersController < Projects::ApplicationController
-  before_action :cluster, except: [:index, :new, :create_gcp, :create_user]
-  before_action :authorize_read_cluster!
-  before_action :generate_gcp_authorize_url, only: [:new]
-  before_action :validate_gcp_token, only: [:new]
-  before_action :gcp_cluster, only: [:new]
-  before_action :user_cluster, only: [:new]
-  before_action :authorize_create_cluster!, only: [:new]
-  before_action :authorize_update_cluster!, only: [:update]
-  before_action :authorize_admin_cluster!, only: [:destroy]
-  before_action :update_applications_status, only: [:status]
-  helper_method :token_in_session
+class Projects::ClustersController < Clusters::ClustersController
+  include ProjectUnauthorized
 
-  STATUS_POLLING_INTERVAL = 10_000
+  prepend_before_action :project
+  before_action :repository
 
-  def index
-    clusters = ClustersFinder.new(project, current_user, :all).execute
-    @clusters = clusters.page(params[:page]).per(20)
-  end
-
-  def new
-  end
-
-  def status
-    respond_to do |format|
-      format.json do
-        Gitlab::PollingInterval.set_header(response, interval: STATUS_POLLING_INTERVAL)
-
-        render json: ClusterSerializer
-          .new(project: @project, current_user: @current_user)
-          .represent_status(@cluster)
-      end
-    end
-  end
-
-  def show
-  end
-
-  def update
-    Clusters::UpdateService
-      .new(current_user, update_params)
-      .execute(cluster)
-
-    if cluster.valid?
-      respond_to do |format|
-        format.json do
-          head :no_content
-        end
-        format.html do
-          flash[:notice] = _('Kubernetes cluster was successfully updated.')
-          redirect_to project_cluster_path(project, cluster)
-        end
-      end
-    else
-      respond_to do |format|
-        format.json { head :bad_request }
-        format.html { render :show }
-      end
-    end
-  end
-
-  def destroy
-    if cluster.destroy
-      flash[:notice] = _('Kubernetes cluster integration was successfully removed.')
-      redirect_to project_clusters_path(project), status: :found
-    else
-      flash[:notice] = _('Kubernetes cluster integration was not removed.')
-      render :show
-    end
-  end
-
-  def create_gcp
-    @gcp_cluster = ::Clusters::CreateService
-      .new(current_user, create_gcp_cluster_params)
-      .execute(project: project, access_token: token_in_session)
-
-    if @gcp_cluster.persisted?
-      redirect_to project_cluster_path(project, @gcp_cluster)
-    else
-      generate_gcp_authorize_url
-      validate_gcp_token
-      user_cluster
-
-      render :new, locals: { active_tab: 'gcp' }
-    end
-  end
-
-  def create_user
-    @user_cluster = ::Clusters::CreateService
-      .new(current_user, create_user_cluster_params)
-      .execute(project: project, access_token: token_in_session)
-
-    if @user_cluster.persisted?
-      redirect_to project_cluster_path(project, @user_cluster)
-    else
-      generate_gcp_authorize_url
-      validate_gcp_token
-      gcp_cluster
-
-      render :new, locals: { active_tab: 'user' }
-    end
-  end
+  layout 'project'
 
   private
 
-  def cluster
-    @cluster ||= project.clusters.find(params[:id])
-                                 .present(current_user: current_user)
-  end
-
-  def update_params
-    if cluster.managed?
-      params.require(:cluster).permit(
-        :enabled,
-        :environment_scope,
-        platform_kubernetes_attributes: [
-          :namespace
-        ]
-      )
-    else
-      params.require(:cluster).permit(
-        :enabled,
-        :name,
-        :environment_scope,
-        platform_kubernetes_attributes: [
-          :api_url,
-          :token,
-          :ca_cert,
-          :namespace
-        ]
-      )
-    end
-  end
-
-  def create_gcp_cluster_params
-    params.require(:cluster).permit(
-      :enabled,
-      :name,
-      :environment_scope,
-      provider_gcp_attributes: [
-        :gcp_project_id,
-        :zone,
-        :num_nodes,
-        :machine_type,
-        :legacy_abac
-      ]).merge(
-        provider_type: :gcp,
-        platform_type: :kubernetes
-      )
-  end
-
-  def create_user_cluster_params
-    params.require(:cluster).permit(
-      :enabled,
-      :name,
-      :environment_scope,
-      platform_kubernetes_attributes: [
-        :namespace,
-        :api_url,
-        :token,
-        :ca_cert,
-        :authorization_type
-      ]).merge(
-        provider_type: :user,
-        platform_type: :kubernetes
-      )
-  end
-
-  def generate_gcp_authorize_url
-    state = generate_session_key_redirect(new_project_cluster_path(@project).to_s)
-
-    @authorize_url = GoogleApi::CloudPlatform::Client.new(
-      nil, callback_google_api_auth_url,
-      state: state).authorize_url
-  rescue GoogleApi::Auth::ConfigMissingError
-    # no-op
-  end
-
-  def gcp_cluster
-    @gcp_cluster = ::Clusters::Cluster.new.tap do |cluster|
-      cluster.build_provider_gcp
-    end
-  end
-
-  def user_cluster
-    @user_cluster = ::Clusters::Cluster.new.tap do |cluster|
-      cluster.build_platform_kubernetes
-    end
-  end
-
-  def validate_gcp_token
-    @valid_gcp_token = GoogleApi::CloudPlatform::Client.new(token_in_session, nil)
-      .validate_token(expires_at_in_session)
-  end
-
-  def token_in_session
-    session[GoogleApi::CloudPlatform::Client.session_key_for_token]
-  end
-
-  def expires_at_in_session
-    @expires_at_in_session ||=
-      session[GoogleApi::CloudPlatform::Client.session_key_for_expires_at]
-  end
-
-  def generate_session_key_redirect(uri)
-    GoogleApi::CloudPlatform::Client.new_session_key_for_redirect_uri do |key|
-      session[key] = uri
-    end
-  end
-
-  def authorize_update_cluster!
-    access_denied! unless can?(current_user, :update_cluster, cluster)
+  def clusterable
+    @clusterable ||= ClusterablePresenter.fabricate(project, current_user: current_user)
   end
 
-  def authorize_admin_cluster!
-    access_denied! unless can?(current_user, :admin_cluster, cluster)
+  def project
+    @project ||= find_routable!(Project, File.join(params[:namespace_id], params[:project_id]), not_found_or_authorized_proc: project_unauthorized_proc)
   end
 
-  def update_applications_status
-    @cluster.applications.each(&:schedule_status_update)
+  def repository
+    @repository ||= project.repository
   end
 end
diff --git a/app/controllers/projects/commit_controller.rb b/app/controllers/projects/commit_controller.rb
index 00b63f55710..32fc5140366 100644
--- a/app/controllers/projects/commit_controller.rb
+++ b/app/controllers/projects/commit_controller.rb
@@ -43,7 +43,7 @@ class Projects::CommitController < Projects::ApplicationController
   # rubocop: disable CodeReuse/ActiveRecord
   def pipelines
     @pipelines = @commit.pipelines.order(id: :desc)
-    @pipelines = @pipelines.where(ref: params[:ref]) if params[:ref]
+    @pipelines = @pipelines.where(ref: params[:ref]).page(params[:page]).per(30) if params[:ref]
 
     respond_to do |format|
       format.html
@@ -53,6 +53,7 @@ class Projects::CommitController < Projects::ApplicationController
         render json: {
           pipelines: PipelineSerializer
             .new(project: @project, current_user: @current_user)
+            .with_pagination(request, response)
             .represent(@pipelines),
           count: {
             all: @pipelines.count
diff --git a/app/controllers/projects/merge_requests_controller.rb b/app/controllers/projects/merge_requests_controller.rb
index 27b83da4f54..4bdb857b2d9 100644
--- a/app/controllers/projects/merge_requests_controller.rb
+++ b/app/controllers/projects/merge_requests_controller.rb
@@ -84,13 +84,14 @@ class Projects::MergeRequestsController < Projects::MergeRequests::ApplicationCo
   end
 
   def pipelines
-    @pipelines = @merge_request.all_pipelines
+    @pipelines = @merge_request.all_pipelines.page(params[:page]).per(30)
 
     Gitlab::PollingInterval.set_header(response, interval: 10_000)
 
     render json: {
       pipelines: PipelineSerializer
         .new(project: @project, current_user: @current_user)
+        .with_pagination(request, response)
         .represent(@pipelines),
       count: {
         all: @pipelines.count
diff --git a/app/finders/clusters_finder.rb b/app/finders/clusters_finder.rb
index b40d6c41b71..0cce493b73e 100644
--- a/app/finders/clusters_finder.rb
+++ b/app/finders/clusters_finder.rb
@@ -1,20 +1,20 @@
 # frozen_string_literal: true
 
 class ClustersFinder
-  def initialize(project, user, scope)
-    @project = project
+  def initialize(clusterable, user, scope)
+    @clusterable = clusterable
     @user = user
     @scope = scope || :active
   end
 
   def execute
-    clusters = project.clusters
+    clusters = clusterable.clusters
     filter_by_scope(clusters)
   end
 
   private
 
-  attr_reader :project, :user, :scope
+  attr_reader :clusterable, :user, :scope
 
   def filter_by_scope(clusters)
     case scope.to_sym
diff --git a/app/helpers/clusters_helper.rb b/app/helpers/clusters_helper.rb
index 19eb763e1de..916dcb1a308 100644
--- a/app/helpers/clusters_helper.rb
+++ b/app/helpers/clusters_helper.rb
@@ -1,7 +1,8 @@
 # frozen_string_literal: true
 
 module ClustersHelper
-  def has_multiple_clusters?(project)
+  # EE overrides this
+  def has_multiple_clusters?
     false
   end
 
@@ -10,7 +11,7 @@ module ClustersHelper
     return unless show_gcp_signup_offer?
 
     content_tag :section, class: 'no-animate expanded' do
-      render 'projects/clusters/gcp_signup_offer_banner'
+      render 'clusters/clusters/gcp_signup_offer_banner'
     end
   end
 end
diff --git a/app/helpers/labels_helper.rb b/app/helpers/labels_helper.rb
index 76ed8efe2c6..39f661b5f0c 100644
--- a/app/helpers/labels_helper.rb
+++ b/app/helpers/labels_helper.rb
@@ -143,7 +143,7 @@ module LabelsHelper
 
   def labels_filter_path(options = {})
     project = @target_project || @project
-    format = options.delete(:format) || :html
+    format = options.delete(:format)
 
     if project
       project_labels_path(project, format, options)
diff --git a/app/mailers/emails/issues.rb b/app/mailers/emails/issues.rb
index 602e5afe26b..93b51fb1774 100644
--- a/app/mailers/emails/issues.rb
+++ b/app/mailers/emails/issues.rb
@@ -45,6 +45,20 @@ module Emails
       mail_answer_thread(@issue, issue_thread_options(updated_by_user_id, recipient_id, reason))
     end
 
+    def removed_milestone_issue_email(recipient_id, issue_id, updated_by_user_id, reason = nil)
+      setup_issue_mail(issue_id, recipient_id)
+
+      mail_answer_thread(@issue, issue_thread_options(updated_by_user_id, recipient_id, reason))
+    end
+
+    def changed_milestone_issue_email(recipient_id, issue_id, milestone, updated_by_user_id, reason = nil)
+      setup_issue_mail(issue_id, recipient_id)
+
+      @milestone = milestone
+      @milestone_url = milestone_url(@milestone)
+      mail_answer_thread(@issue, issue_thread_options(updated_by_user_id, recipient_id, reason))
+    end
+
     def issue_status_changed_email(recipient_id, issue_id, status, updated_by_user_id, reason = nil)
       setup_issue_mail(issue_id, recipient_id)
 
diff --git a/app/mailers/emails/merge_requests.rb b/app/mailers/emails/merge_requests.rb
index be085496731..6524d0c2087 100644
--- a/app/mailers/emails/merge_requests.rb
+++ b/app/mailers/emails/merge_requests.rb
@@ -40,6 +40,20 @@ module Emails
       mail_answer_thread(@merge_request, merge_request_thread_options(updated_by_user_id, recipient_id, reason))
     end
 
+    def removed_milestone_merge_request_email(recipient_id, merge_request_id, updated_by_user_id, reason = nil)
+      setup_merge_request_mail(merge_request_id, recipient_id)
+
+      mail_answer_thread(@merge_request, merge_request_thread_options(updated_by_user_id, recipient_id, reason))
+    end
+
+    def changed_milestone_merge_request_email(recipient_id, merge_request_id, milestone, updated_by_user_id, reason = nil)
+      setup_merge_request_mail(merge_request_id, recipient_id)
+
+      @milestone = milestone
+      @milestone_url = milestone_url(@milestone)
+      mail_answer_thread(@merge_request, merge_request_thread_options(updated_by_user_id, recipient_id, reason))
+    end
+
     def closed_merge_request_email(recipient_id, merge_request_id, updated_by_user_id, reason = nil)
       setup_merge_request_mail(merge_request_id, recipient_id)
 
diff --git a/app/mailers/previews/notify_preview.rb b/app/mailers/previews/notify_preview.rb
index 2f5b5483e9d..e7e8d96eca4 100644
--- a/app/mailers/previews/notify_preview.rb
+++ b/app/mailers/previews/notify_preview.rb
@@ -68,6 +68,14 @@ class NotifyPreview < ActionMailer::Preview
     Notify.issue_status_changed_email(user.id, issue.id, 'closed', user.id).message
   end
 
+  def removed_milestone_issue_email
+    Notify.removed_milestone_issue_email(user.id, issue.id, user.id)
+  end
+
+  def changed_milestone_issue_email
+    Notify.changed_milestone_issue_email(user.id, issue.id, milestone, user.id)
+  end
+
   def closed_merge_request_email
     Notify.closed_merge_request_email(user.id, issue.id, user.id).message
   end
@@ -80,6 +88,14 @@ class NotifyPreview < ActionMailer::Preview
     Notify.merged_merge_request_email(user.id, merge_request.id, user.id).message
   end
 
+  def removed_milestone_merge_request_email
+    Notify.removed_milestone_merge_request_email(user.id, merge_request.id, user.id)
+  end
+
+  def changed_milestone_merge_request_email
+    Notify.changed_milestone_merge_request_email(user.id, merge_request.id, milestone, user.id)
+  end
+
   def member_access_denied_email
     Notify.member_access_denied_email('project', project.id, user.id).message
   end
@@ -143,6 +159,10 @@ class NotifyPreview < ActionMailer::Preview
     @merge_request ||= project.merge_requests.first
   end
 
+  def milestone
+    @milestone ||= issue.milestone
+  end
+
   def pipeline
     @pipeline = Ci::Pipeline.last
   end
diff --git a/app/models/ci/build.rb b/app/models/ci/build.rb
index d73c02ba5d7..bb5d52fc78d 100644
--- a/app/models/ci/build.rb
+++ b/app/models/ci/build.rb
@@ -259,8 +259,7 @@ module Ci
     end
 
     def schedulable?
-      Feature.enabled?('ci_enable_scheduled_build', default_enabled: true) &&
-        self.when == 'delayed' && options[:start_in].present?
+      self.when == 'delayed' && options[:start_in].present?
     end
 
     def options_scheduled_at
diff --git a/app/models/clusters/cluster.rb b/app/models/clusters/cluster.rb
index 1939df9f86e..7b219ec8267 100644
--- a/app/models/clusters/cluster.rb
+++ b/app/models/clusters/cluster.rb
@@ -20,6 +20,7 @@ module Clusters
 
     has_many :cluster_projects, class_name: 'Clusters::Project'
     has_many :projects, through: :cluster_projects, class_name: '::Project'
+    has_one :cluster_project, -> { order(id: :desc) }, class_name: 'Clusters::Project'
 
     has_many :cluster_groups, class_name: 'Clusters::Group'
     has_many :groups, through: :cluster_groups, class_name: '::Group'
@@ -131,6 +132,13 @@ module Clusters
       platform_kubernetes.kubeclient if kubernetes?
     end
 
+    def find_or_initialize_kubernetes_namespace(cluster_project)
+      kubernetes_namespaces.find_or_initialize_by(
+        project: cluster_project.project,
+        cluster_project: cluster_project
+      )
+    end
+
     private
 
     def restrict_modification
diff --git a/app/models/clusters/kubernetes_namespace.rb b/app/models/clusters/kubernetes_namespace.rb
index fb5f6b65d9d..ac7f9193b87 100644
--- a/app/models/clusters/kubernetes_namespace.rb
+++ b/app/models/clusters/kubernetes_namespace.rb
@@ -2,6 +2,8 @@
 
 module Clusters
   class KubernetesNamespace < ActiveRecord::Base
+    include Gitlab::Kubernetes
+
     self.table_name = 'clusters_kubernetes_namespaces'
 
     belongs_to :cluster_project, class_name: 'Clusters::Project'
@@ -12,7 +14,8 @@ module Clusters
     validates :namespace, presence: true
     validates :namespace, uniqueness: { scope: :cluster_id }
 
-    before_validation :set_namespace_and_service_account_to_default, on: :create
+    delegate :ca_pem, to: :platform_kubernetes, allow_nil: true
+    delegate :api_url, to: :platform_kubernetes, allow_nil: true
 
     attr_encrypted :service_account_token,
         mode: :per_attribute_iv,
@@ -23,14 +26,26 @@ module Clusters
       "#{namespace}-token"
     end
 
-    private
+    def configure_predefined_credentials
+      self.namespace = kubernetes_or_project_namespace
+      self.service_account_name = default_service_account_name
+    end
+
+    def predefined_variables
+      config = YAML.dump(kubeconfig)
 
-    def set_namespace_and_service_account_to_default
-      self.namespace ||= default_namespace
-      self.service_account_name ||= default_service_account_name
+      Gitlab::Ci::Variables::Collection.new.tap do |variables|
+        variables
+          .append(key: 'KUBE_SERVICE_ACCOUNT', value: service_account_name)
+          .append(key: 'KUBE_NAMESPACE', value: namespace)
+          .append(key: 'KUBE_TOKEN', value: service_account_token, public: false)
+          .append(key: 'KUBECONFIG', value: config, public: false, file: true)
+      end
     end
 
-    def default_namespace
+    private
+
+    def kubernetes_or_project_namespace
       platform_kubernetes&.namespace.presence || project_namespace
     end
 
@@ -45,5 +60,13 @@ module Clusters
     def project_slug
       "#{project.path}-#{project.id}".downcase
     end
+
+    def kubeconfig
+      to_kubeconfig(
+        url: api_url,
+        namespace: namespace,
+        token: service_account_token,
+        ca_pem: ca_pem)
+    end
   end
 end
diff --git a/app/models/clusters/platforms/kubernetes.rb b/app/models/clusters/platforms/kubernetes.rb
index d961130d251..d69038be532 100644
--- a/app/models/clusters/platforms/kubernetes.rb
+++ b/app/models/clusters/platforms/kubernetes.rb
@@ -6,6 +6,7 @@ module Clusters
       include Gitlab::Kubernetes
       include ReactiveCaching
       include EnumWithNil
+      include AfterCommitQueue
 
       RESERVED_NAMESPACES = %w(gitlab-managed-apps).freeze
 
@@ -44,6 +45,7 @@ module Clusters
       validate :prevent_modification, on: :update
 
       after_save :clear_reactive_cache!
+      after_update :update_kubernetes_namespace
 
       alias_attribute :ca_pem, :ca_cert
 
@@ -68,21 +70,31 @@ module Clusters
         end
       end
 
-      def predefined_variables
-        config = YAML.dump(kubeconfig)
-
+      def predefined_variables(project:)
         Gitlab::Ci::Variables::Collection.new.tap do |variables|
-          variables
-            .append(key: 'KUBE_URL', value: api_url)
-            .append(key: 'KUBE_TOKEN', value: token, public: false)
-            .append(key: 'KUBE_NAMESPACE', value: actual_namespace)
-            .append(key: 'KUBECONFIG', value: config, public: false, file: true)
+          variables.append(key: 'KUBE_URL', value: api_url)
 
           if ca_pem.present?
             variables
               .append(key: 'KUBE_CA_PEM', value: ca_pem)
               .append(key: 'KUBE_CA_PEM_FILE', value: ca_pem, file: true)
           end
+
+          if kubernetes_namespace = cluster.kubernetes_namespaces.find_by(project: project)
+            variables.concat(kubernetes_namespace.predefined_variables)
+          else
+            # From 11.5, every Clusters::Project should have at least one
+            # Clusters::KubernetesNamespace, so once migration has been completed,
+            # this 'else' branch will be removed. For more information, please see
+            # https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22433
+            config = YAML.dump(kubeconfig)
+
+            variables
+              .append(key: 'KUBE_URL', value: api_url)
+              .append(key: 'KUBE_TOKEN', value: token, public: false)
+              .append(key: 'KUBE_NAMESPACE', value: actual_namespace)
+              .append(key: 'KUBECONFIG', value: config, public: false, file: true)
+          end
         end
       end
 
@@ -205,6 +217,14 @@ module Clusters
 
         true
       end
+
+      def update_kubernetes_namespace
+        return unless namespace_changed?
+
+        run_after_commit do
+          ClusterPlatformConfigureWorker.perform_async(cluster_id)
+        end
+      end
     end
   end
 end
diff --git a/app/models/concerns/token_authenticatable.rb b/app/models/concerns/token_authenticatable.rb
index 66db4bd92de..23a43aec677 100644
--- a/app/models/concerns/token_authenticatable.rb
+++ b/app/models/concerns/token_authenticatable.rb
@@ -10,6 +10,7 @@ module TokenAuthenticatable
 
     def add_authentication_token_field(token_field, options = {})
       @token_fields = [] unless @token_fields
+      unique = options.fetch(:unique, true)
 
       if @token_fields.include?(token_field)
         raise ArgumentError.new("#{token_field} already configured via add_authentication_token_field")
@@ -25,8 +26,10 @@ module TokenAuthenticatable
                    TokenAuthenticatableStrategies::Insecure.new(self, token_field, options)
                  end
 
-      define_singleton_method("find_by_#{token_field}") do |token|
-        strategy.find_token_authenticatable(token)
+      if unique
+        define_singleton_method("find_by_#{token_field}") do |token|
+          strategy.find_token_authenticatable(token)
+        end
       end
 
       define_method(token_field) do
diff --git a/app/models/concerns/token_authenticatable_strategies/base.rb b/app/models/concerns/token_authenticatable_strategies/base.rb
index f0f7107d627..413721d3e6c 100644
--- a/app/models/concerns/token_authenticatable_strategies/base.rb
+++ b/app/models/concerns/token_authenticatable_strategies/base.rb
@@ -43,10 +43,14 @@ module TokenAuthenticatableStrategies
       set_token(instance, new_token)
     end
 
+    def unique
+      @options.fetch(:unique, true)
+    end
+
     def generate_available_token
       loop do
         token = generate_token
-        break token unless find_token_authenticatable(token, true)
+        break token unless unique && find_token_authenticatable(token, true)
       end
     end
 
diff --git a/app/models/issue.rb b/app/models/issue.rb
index 4ace5d3ab97..0de5e434b02 100644
--- a/app/models/issue.rb
+++ b/app/models/issue.rb
@@ -240,7 +240,8 @@ class Issue < ActiveRecord::Base
           reference_path: issue_reference,
           real_path: url_helper.project_issue_path(project, self),
           issue_sidebar_endpoint: url_helper.project_issue_path(project, self, format: :json, serializer: 'sidebar'),
-          toggle_subscription_endpoint: url_helper.toggle_subscription_project_issue_path(project, self)
+          toggle_subscription_endpoint: url_helper.toggle_subscription_project_issue_path(project, self),
+          assignable_labels_endpoint: url_helper.project_labels_path(project, format: :json, include_ancestor_groups: true)
         )
       end
 
diff --git a/app/models/key.rb b/app/models/key.rb
index bdb83e12793..8f93418b88b 100644
--- a/app/models/key.rb
+++ b/app/models/key.rb
@@ -34,6 +34,10 @@ class Key < ActiveRecord::Base
   after_destroy :post_destroy_hook
   after_destroy :refresh_user_cache
 
+  def self.regular_keys
+    where(type: ['Key', nil])
+  end
+
   def key=(value)
     write_attribute(:key, value.present? ? Gitlab::SSHPublicKey.sanitize(value) : nil)
 
diff --git a/app/models/merge_request.rb b/app/models/merge_request.rb
index 7eef08aa6a3..735d9fba966 100644
--- a/app/models/merge_request.rb
+++ b/app/models/merge_request.rb
@@ -353,6 +353,15 @@ class MergeRequest < ActiveRecord::Base
     end
   end
 
+  # Returns true if there are commits that match at least one commit SHA.
+  def includes_any_commits?(shas)
+    if persisted?
+      merge_request_diff.commits_by_shas(shas).exists?
+    else
+      (commit_shas & shas).present?
+    end
+  end
+
   # Calls `MergeWorker` to proceed with the merge process and
   # updates `merge_jid` with the MergeWorker#jid.
   # This helps tracking enqueued and ongoing merge jobs.
diff --git a/app/models/merge_request_diff.rb b/app/models/merge_request_diff.rb
index 02c6b650f33..bb6ff8921df 100644
--- a/app/models/merge_request_diff.rb
+++ b/app/models/merge_request_diff.rb
@@ -140,6 +140,12 @@ class MergeRequestDiff < ActiveRecord::Base
     merge_request_diff_commits.map(&:sha)
   end
 
+  def commits_by_shas(shas)
+    return [] unless shas.present?
+
+    merge_request_diff_commits.where(sha: shas)
+  end
+
   def diff_refs=(new_diff_refs)
     self.base_commit_sha = new_diff_refs&.base_sha
     self.start_commit_sha = new_diff_refs&.start_sha
diff --git a/app/models/project.rb b/app/models/project.rb
index e2e309e8496..fa995b5b061 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -1829,7 +1829,7 @@ class Project < ActiveRecord::Base
   end
 
   def deployment_variables(environment: nil)
-    deployment_platform(environment: environment)&.predefined_variables || []
+    deployment_platform(environment: environment)&.predefined_variables(project: self) || []
   end
 
   def auto_devops_variables
diff --git a/app/models/project_services/kubernetes_service.rb b/app/models/project_services/kubernetes_service.rb
index 798944d0c06..3459ded7ccf 100644
--- a/app/models/project_services/kubernetes_service.rb
+++ b/app/models/project_services/kubernetes_service.rb
@@ -104,7 +104,12 @@ class KubernetesService < DeploymentService
     { success: false, result: err }
   end
 
-  def predefined_variables
+  # Project param was added on
+  # https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22011,
+  # as a way to keep this service compatible with
+  # Clusters::Platforms::Kubernetes, it won't be used on this method
+  # as it's only needed for Clusters::Cluster.
+  def predefined_variables(project:)
     config = YAML.dump(kubeconfig)
 
     Gitlab::Ci::Variables::Collection.new.tap do |variables|
diff --git a/app/models/user.rb b/app/models/user.rb
index cc2cd1b7723..d3eb7162174 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -88,7 +88,7 @@ class User < ActiveRecord::Base
   has_one :namespace, -> { where(type: nil) }, dependent: :destroy, foreign_key: :owner_id, inverse_of: :owner, autosave: true # rubocop:disable Cop/ActiveRecordDependent
 
   # Profile
-  has_many :keys, -> { where(type: ['Key', nil]) }, dependent: :destroy # rubocop:disable Cop/ActiveRecordDependent
+  has_many :keys, -> { regular_keys }, dependent: :destroy # rubocop:disable Cop/ActiveRecordDependent
   has_many :deploy_keys, -> { where(type: 'DeployKey') }, dependent: :nullify # rubocop:disable Cop/ActiveRecordDependent
   has_many :gpg_keys
 
@@ -941,12 +941,17 @@ class User < ActiveRecord::Base
     if !Gitlab.config.ldap.enabled
       false
     elsif ldap_user?
-      !last_credential_check_at || (last_credential_check_at + 1.hour) < Time.now
+      !last_credential_check_at || (last_credential_check_at + ldap_sync_time) < Time.now
     else
       false
     end
   end
 
+  def ldap_sync_time
+    # This number resides in this method so it can be redefined in EE.
+    1.hour
+  end
+
   def try_obtain_ldap_lease
     # After obtaining this lease LDAP checks will be blocked for 600 seconds
     # (10 minutes) for this user.
diff --git a/app/presenters/clusterable_presenter.rb b/app/presenters/clusterable_presenter.rb
new file mode 100644
index 00000000000..cff0e74d6ea
--- /dev/null
+++ b/app/presenters/clusterable_presenter.rb
@@ -0,0 +1,46 @@
+# frozen_string_literal: true
+
+class ClusterablePresenter < Gitlab::View::Presenter::Delegated
+  presents :clusterable
+
+  def self.fabricate(clusterable, **attributes)
+    presenter_class = "#{clusterable.class.name}ClusterablePresenter".constantize
+    attributes_with_presenter_class = attributes.merge(presenter_class: presenter_class)
+
+    Gitlab::View::Presenter::Factory
+      .new(clusterable, attributes_with_presenter_class)
+      .fabricate!
+  end
+
+  def can_create_cluster?
+    can?(current_user, :create_cluster, clusterable)
+  end
+
+  def index_path
+    polymorphic_path([clusterable, :clusters])
+  end
+
+  def new_path
+    new_polymorphic_path([clusterable, :cluster])
+  end
+
+  def create_user_clusters_path
+    polymorphic_path([clusterable, :clusters], action: :create_user)
+  end
+
+  def create_gcp_clusters_path
+    polymorphic_path([clusterable, :clusters], action: :create_gcp)
+  end
+
+  def cluster_status_cluster_path(cluster, params = {})
+    raise NotImplementedError
+  end
+
+  def install_applications_cluster_path(cluster, application)
+    raise NotImplementedError
+  end
+
+  def cluster_path(cluster, params = {})
+    raise NotImplementedError
+  end
+end
diff --git a/app/presenters/clusters/cluster_presenter.rb b/app/presenters/clusters/cluster_presenter.rb
index dfdd8e82f97..78d632eb77c 100644
--- a/app/presenters/clusters/cluster_presenter.rb
+++ b/app/presenters/clusters/cluster_presenter.rb
@@ -11,5 +11,13 @@ module Clusters
     def can_toggle_cluster?
       can?(current_user, :update_cluster, cluster) && created?
     end
+
+    def show_path
+      if cluster.project_type?
+        project_cluster_path(project, cluster)
+      else
+        raise NotImplementedError
+      end
+    end
   end
 end
diff --git a/app/presenters/project_clusterable_presenter.rb b/app/presenters/project_clusterable_presenter.rb
new file mode 100644
index 00000000000..12077b2e735
--- /dev/null
+++ b/app/presenters/project_clusterable_presenter.rb
@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+class ProjectClusterablePresenter < ClusterablePresenter
+  def cluster_status_cluster_path(cluster, params = {})
+    cluster_status_project_cluster_path(clusterable, cluster, params)
+  end
+
+  def install_applications_cluster_path(cluster, application)
+    install_applications_project_cluster_path(clusterable, cluster, application)
+  end
+
+  def cluster_path(cluster, params = {})
+    project_cluster_path(clusterable, cluster, params)
+  end
+end
diff --git a/app/serializers/build_action_entity.rb b/app/serializers/build_action_entity.rb
index 0db7875aa87..95833c3528f 100644
--- a/app/serializers/build_action_entity.rb
+++ b/app/serializers/build_action_entity.rb
@@ -12,7 +12,8 @@ class BuildActionEntity < Grape::Entity
   end
 
   expose :playable?, as: :playable
-  expose :scheduled_at, if: -> (build) { build.scheduled? }
+  expose :scheduled?, as: :scheduled
+  expose :scheduled_at, if: -> (*) { scheduled? }
 
   expose :unschedule_path, if: -> (build) { build.scheduled? } do |build|
     unschedule_project_job_path(build.project, build)
@@ -25,4 +26,8 @@ class BuildActionEntity < Grape::Entity
   def playable?
     build.playable? && can?(request.current_user, :update_build, build)
   end
+
+  def scheduled?
+    build.scheduled?
+  end
 end
diff --git a/app/serializers/job_entity.rb b/app/serializers/job_entity.rb
index a0a66511b7b..aebbc18e32f 100644
--- a/app/serializers/job_entity.rb
+++ b/app/serializers/job_entity.rb
@@ -33,6 +33,7 @@ class JobEntity < Grape::Entity
   end
 
   expose :playable?, as: :playable
+  expose :scheduled?, as: :scheduled
   expose :scheduled_at, if: -> (*) { scheduled? }
   expose :created_at
   expose :updated_at
diff --git a/app/services/clusters/create_service.rb b/app/services/clusters/create_service.rb
index cd843b8ffa8..270db4a52fd 100644
--- a/app/services/clusters/create_service.rb
+++ b/app/services/clusters/create_service.rb
@@ -8,10 +8,11 @@ module Clusters
       @current_user, @params = user, params.dup
     end
 
-    def execute(project:, access_token: nil)
-      raise ArgumentError, _('Instance does not support multiple Kubernetes clusters') unless can_create_cluster?(project)
+    def execute(access_token: nil)
+      raise ArgumentError, 'Unknown clusterable provided' unless clusterable
+      raise ArgumentError, _('Instance does not support multiple Kubernetes clusters') unless can_create_cluster?
 
-      cluster_params = params.merge(user: current_user, cluster_type: :project_type, projects: [project])
+      cluster_params = params.merge(user: current_user).merge(clusterable_params)
       cluster_params[:provider_gcp_attributes].try do |provider|
         provider[:access_token] = access_token
       end
@@ -27,9 +28,20 @@ module Clusters
       Clusters::Cluster.create(cluster_params)
     end
 
+    def clusterable
+      @clusterable ||= params.delete(:clusterable)
+    end
+
+    def clusterable_params
+      case clusterable
+      when ::Project
+        { cluster_type: :project_type, projects: [clusterable] }
+      end
+    end
+
     # EE would override this method
-    def can_create_cluster?(project)
-      project.clusters.empty?
+    def can_create_cluster?
+      clusterable.clusters.empty?
     end
   end
 end
diff --git a/app/services/clusters/gcp/finalize_creation_service.rb b/app/services/clusters/gcp/finalize_creation_service.rb
index 6ee63db8eb9..3df43657fa0 100644
--- a/app/services/clusters/gcp/finalize_creation_service.rb
+++ b/app/services/clusters/gcp/finalize_creation_service.rb
@@ -11,8 +11,9 @@ module Clusters
         configure_provider
         create_gitlab_service_account!
         configure_kubernetes
-
         cluster.save!
+        configure_project_service_account
+
       rescue Google::Apis::ServerError, Google::Apis::ClientError, Google::Apis::AuthorizationError => e
         provider.make_errored!("Failed to request to CloudPlatform; #{e.message}")
       rescue Kubeclient::HttpError => e
@@ -24,7 +25,10 @@ module Clusters
       private
 
       def create_gitlab_service_account!
-        Clusters::Gcp::Kubernetes::CreateServiceAccountService.new(kube_client, rbac: create_rbac_cluster?).execute
+        Clusters::Gcp::Kubernetes::CreateServiceAccountService.gitlab_creator(
+          kube_client,
+          rbac: create_rbac_cluster?
+        ).execute
       end
 
       def configure_provider
@@ -44,7 +48,20 @@ module Clusters
       end
 
       def request_kubernetes_token
-        Clusters::Gcp::Kubernetes::FetchKubernetesTokenService.new(kube_client).execute
+        Clusters::Gcp::Kubernetes::FetchKubernetesTokenService.new(
+          kube_client,
+          Clusters::Gcp::Kubernetes::GITLAB_ADMIN_TOKEN_NAME,
+          Clusters::Gcp::Kubernetes::GITLAB_SERVICE_ACCOUNT_NAMESPACE
+        ).execute
+      end
+
+      def configure_project_service_account
+        kubernetes_namespace = cluster.find_or_initialize_kubernetes_namespace(cluster.cluster_project)
+
+        Clusters::Gcp::Kubernetes::CreateOrUpdateNamespaceService.new(
+          cluster: cluster,
+          kubernetes_namespace: kubernetes_namespace
+        ).execute
       end
 
       def authorization_type
diff --git a/app/services/clusters/gcp/kubernetes.rb b/app/services/clusters/gcp/kubernetes.rb
index d014d73b3e8..90ed529670c 100644
--- a/app/services/clusters/gcp/kubernetes.rb
+++ b/app/services/clusters/gcp/kubernetes.rb
@@ -3,11 +3,12 @@
 module Clusters
   module Gcp
     module Kubernetes
-      SERVICE_ACCOUNT_NAME = 'gitlab'
-      SERVICE_ACCOUNT_NAMESPACE = 'default'
-      SERVICE_ACCOUNT_TOKEN_NAME = 'gitlab-token'
-      CLUSTER_ROLE_BINDING_NAME = 'gitlab-admin'
-      CLUSTER_ROLE_NAME = 'cluster-admin'
+      GITLAB_SERVICE_ACCOUNT_NAME = 'gitlab'
+      GITLAB_SERVICE_ACCOUNT_NAMESPACE = 'default'
+      GITLAB_ADMIN_TOKEN_NAME = 'gitlab-token'
+      GITLAB_CLUSTER_ROLE_BINDING_NAME = 'gitlab-admin'
+      GITLAB_CLUSTER_ROLE_NAME = 'cluster-admin'
+      PROJECT_CLUSTER_ROLE_NAME = 'edit'
     end
   end
 end
diff --git a/app/services/clusters/gcp/kubernetes/create_or_update_namespace_service.rb b/app/services/clusters/gcp/kubernetes/create_or_update_namespace_service.rb
new file mode 100644
index 00000000000..a888fab2789
--- /dev/null
+++ b/app/services/clusters/gcp/kubernetes/create_or_update_namespace_service.rb
@@ -0,0 +1,54 @@
+# frozen_string_literal: true
+
+module Clusters
+  module Gcp
+    module Kubernetes
+      class CreateOrUpdateNamespaceService
+        def initialize(cluster:, kubernetes_namespace:)
+          @cluster = cluster
+          @kubernetes_namespace = kubernetes_namespace
+          @platform = cluster.platform
+        end
+
+        def execute
+          configure_kubernetes_namespace
+          create_project_service_account
+          configure_kubernetes_token
+
+          kubernetes_namespace.save!
+        rescue ::Kubeclient::HttpError => err
+          raise err unless err.error_code = 404
+        end
+
+        private
+
+        attr_reader :cluster, :kubernetes_namespace, :platform
+
+        def configure_kubernetes_namespace
+          kubernetes_namespace.configure_predefined_credentials
+        end
+
+        def create_project_service_account
+          Clusters::Gcp::Kubernetes::CreateServiceAccountService.namespace_creator(
+            platform.kubeclient,
+            service_account_name: kubernetes_namespace.service_account_name,
+            service_account_namespace: kubernetes_namespace.namespace,
+            rbac: platform.rbac?
+          ).execute
+        end
+
+        def configure_kubernetes_token
+          kubernetes_namespace.service_account_token = fetch_service_account_token
+        end
+
+        def fetch_service_account_token
+          Clusters::Gcp::Kubernetes::FetchKubernetesTokenService.new(
+            platform.kubeclient,
+            kubernetes_namespace.token_name,
+            kubernetes_namespace.namespace
+          ).execute
+        end
+      end
+    end
+  end
+end
diff --git a/app/services/clusters/gcp/kubernetes/create_service_account_service.rb b/app/services/clusters/gcp/kubernetes/create_service_account_service.rb
index d17744591e6..dfc4bf7a358 100644
--- a/app/services/clusters/gcp/kubernetes/create_service_account_service.rb
+++ b/app/services/clusters/gcp/kubernetes/create_service_account_service.rb
@@ -4,46 +4,96 @@ module Clusters
   module Gcp
     module Kubernetes
       class CreateServiceAccountService
-        attr_reader :kubeclient, :rbac
-
-        def initialize(kubeclient, rbac:)
+        def initialize(kubeclient, service_account_name:, service_account_namespace:, token_name:, rbac:, namespace_creator: false, role_binding_name: nil)
           @kubeclient = kubeclient
+          @service_account_name = service_account_name
+          @service_account_namespace = service_account_namespace
+          @token_name = token_name
           @rbac = rbac
+          @namespace_creator = namespace_creator
+          @role_binding_name = role_binding_name
+        end
+
+        def self.gitlab_creator(kubeclient, rbac:)
+          self.new(
+            kubeclient,
+            service_account_name: Clusters::Gcp::Kubernetes::GITLAB_SERVICE_ACCOUNT_NAME,
+            service_account_namespace: Clusters::Gcp::Kubernetes::GITLAB_SERVICE_ACCOUNT_NAMESPACE,
+            token_name: Clusters::Gcp::Kubernetes::GITLAB_ADMIN_TOKEN_NAME,
+            rbac: rbac
+          )
+        end
+
+        def self.namespace_creator(kubeclient, service_account_name:, service_account_namespace:, rbac:)
+          self.new(
+            kubeclient,
+            service_account_name: service_account_name,
+            service_account_namespace: service_account_namespace,
+            token_name: "#{service_account_namespace}-token",
+            rbac: rbac,
+            namespace_creator: true,
+            role_binding_name: "gitlab-#{service_account_namespace}"
+          )
         end
 
         def execute
+          ensure_project_namespace_exists if namespace_creator
           kubeclient.create_service_account(service_account_resource)
           kubeclient.create_secret(service_account_token_resource)
-          kubeclient.create_cluster_role_binding(cluster_role_binding_resource) if rbac
+          create_role_or_cluster_role_binding if rbac
         end
 
         private
 
+        attr_reader :kubeclient, :service_account_name, :service_account_namespace, :token_name, :rbac, :namespace_creator, :role_binding_name
+
+        def ensure_project_namespace_exists
+          Gitlab::Kubernetes::Namespace.new(
+            service_account_namespace,
+            kubeclient
+          ).ensure_exists!
+        end
+
+        def create_role_or_cluster_role_binding
+          if namespace_creator
+            kubeclient.create_role_binding(role_binding_resource)
+          else
+            kubeclient.create_cluster_role_binding(cluster_role_binding_resource)
+          end
+        end
+
         def service_account_resource
-          Gitlab::Kubernetes::ServiceAccount.new(service_account_name, service_account_namespace).generate
+          Gitlab::Kubernetes::ServiceAccount.new(
+            service_account_name,
+            service_account_namespace
+          ).generate
         end
 
         def service_account_token_resource
           Gitlab::Kubernetes::ServiceAccountToken.new(
-            SERVICE_ACCOUNT_TOKEN_NAME, service_account_name, service_account_namespace).generate
+            token_name,
+            service_account_name,
+            service_account_namespace
+          ).generate
         end
 
         def cluster_role_binding_resource
           subjects = [{ kind: 'ServiceAccount', name: service_account_name, namespace: service_account_namespace }]
 
           Gitlab::Kubernetes::ClusterRoleBinding.new(
-            CLUSTER_ROLE_BINDING_NAME,
-            CLUSTER_ROLE_NAME,
+            Clusters::Gcp::Kubernetes::GITLAB_CLUSTER_ROLE_BINDING_NAME,
+            Clusters::Gcp::Kubernetes::GITLAB_CLUSTER_ROLE_NAME,
             subjects
           ).generate
         end
 
-        def service_account_name
-          SERVICE_ACCOUNT_NAME
-        end
-
-        def service_account_namespace
-          SERVICE_ACCOUNT_NAMESPACE
+        def role_binding_resource
+          Gitlab::Kubernetes::RoleBinding.new(
+            name: role_binding_name,
+            role_name: Clusters::Gcp::Kubernetes::PROJECT_CLUSTER_ROLE_NAME,
+            namespace: service_account_namespace,
+            service_account_name: service_account_name
+          ).generate
         end
       end
     end
diff --git a/app/services/clusters/gcp/kubernetes/fetch_kubernetes_token_service.rb b/app/services/clusters/gcp/kubernetes/fetch_kubernetes_token_service.rb
index 9e09345c8dc..277cc4b788d 100644
--- a/app/services/clusters/gcp/kubernetes/fetch_kubernetes_token_service.rb
+++ b/app/services/clusters/gcp/kubernetes/fetch_kubernetes_token_service.rb
@@ -4,10 +4,12 @@ module Clusters
   module Gcp
     module Kubernetes
       class FetchKubernetesTokenService
-        attr_reader :kubeclient
+        attr_reader :kubeclient, :service_account_token_name, :namespace
 
-        def initialize(kubeclient)
+        def initialize(kubeclient, service_account_token_name, namespace)
           @kubeclient = kubeclient
+          @service_account_token_name = service_account_token_name
+          @namespace = namespace
         end
 
         def execute
@@ -18,7 +20,7 @@ module Clusters
         private
 
         def get_secret
-          kubeclient.get_secret(SERVICE_ACCOUNT_TOKEN_NAME, SERVICE_ACCOUNT_NAMESPACE).as_json
+          kubeclient.get_secret(service_account_token_name, namespace).as_json
         rescue Kubeclient::HttpError => err
           raise err unless err.error_code == 404
 
diff --git a/app/services/issuable_base_service.rb b/app/services/issuable_base_service.rb
index 3e8b9f84042..c388913ae65 100644
--- a/app/services/issuable_base_service.rb
+++ b/app/services/issuable_base_service.rb
@@ -3,6 +3,14 @@
 class IssuableBaseService < BaseService
   private
 
+  attr_accessor :params, :skip_milestone_email
+
+  def initialize(project, user = nil, params = {})
+    super
+
+    @skip_milestone_email = @params.delete(:skip_milestone_email)
+  end
+
   def filter_params(issuable)
     ability_name = :"admin_#{issuable.to_ability_name}"
 
diff --git a/app/services/issues/update_service.rb b/app/services/issues/update_service.rb
index b54b0bf6ef6..fba252b0bae 100644
--- a/app/services/issues/update_service.rb
+++ b/app/services/issues/update_service.rb
@@ -48,6 +48,8 @@ module Issues
         notification_service.async.relabeled_issue(issue, added_labels, current_user)
       end
 
+      handle_milestone_change(issue)
+
       added_mentions = issue.mentioned_users - old_mentioned_users
 
       if added_mentions.present?
@@ -91,6 +93,18 @@ module Issues
 
     private
 
+    def handle_milestone_change(issue)
+      return if skip_milestone_email
+
+      return unless issue.previous_changes.include?('milestone_id')
+
+      if issue.milestone.nil?
+        notification_service.async.removed_milestone_issue(issue, current_user)
+      else
+        notification_service.async.changed_milestone_issue(issue, issue.milestone, current_user)
+      end
+    end
+
     # rubocop: disable CodeReuse/ActiveRecord
     def get_issue_if_allowed(id, board_group_id = nil)
       return unless id
diff --git a/app/services/merge_requests/refresh_service.rb b/app/services/merge_requests/refresh_service.rb
index f01872b205e..53768ff2cbe 100644
--- a/app/services/merge_requests/refresh_service.rb
+++ b/app/services/merge_requests/refresh_service.rb
@@ -87,11 +87,8 @@ module MergeRequests
       filter_merge_requests(merge_requests).each do |merge_request|
         if branch_and_project_match?(merge_request) || @push.force_push?
           merge_request.reload_diff(current_user)
-        else
-          mr_commit_ids = merge_request.commit_shas
-          push_commit_ids = @commits.map(&:id)
-          matches = mr_commit_ids & push_commit_ids
-          merge_request.reload_diff(current_user) if matches.any?
+        elsif merge_request.includes_any_commits?(push_commit_ids)
+          merge_request.reload_diff(current_user)
         end
 
         merge_request.mark_as_unchecked
@@ -104,6 +101,10 @@ module MergeRequests
     end
     # rubocop: enable CodeReuse/ActiveRecord
 
+    def push_commit_ids
+      @push_commit_ids ||= @commits.map(&:id)
+    end
+
     def branch_and_project_match?(merge_request)
       merge_request.source_project == @project &&
         merge_request.source_branch == @push.branch_name
diff --git a/app/services/merge_requests/reload_diffs_service.rb b/app/services/merge_requests/reload_diffs_service.rb
index b4d48fe92ad..b47d8f3f63a 100644
--- a/app/services/merge_requests/reload_diffs_service.rb
+++ b/app/services/merge_requests/reload_diffs_service.rb
@@ -36,7 +36,10 @@ module MergeRequests
       # Remove cache for all diffs on this MR. Do not use the association on the
       # model, as that will interfere with other actions happening when
       # reloading the diff.
-      MergeRequestDiff.where(merge_request: merge_request).each do |merge_request_diff|
+      MergeRequestDiff
+        .where(merge_request: merge_request)
+        .preload(merge_request: :target_project)
+        .find_each do |merge_request_diff|
         next if merge_request_diff == new_diff
 
         cacheable_collection(merge_request_diff).clear_cache
diff --git a/app/services/merge_requests/update_service.rb b/app/services/merge_requests/update_service.rb
index b112edbce7f..aacaf10d09c 100644
--- a/app/services/merge_requests/update_service.rb
+++ b/app/services/merge_requests/update_service.rb
@@ -58,6 +58,8 @@ module MergeRequests
         merge_request.mark_as_unchecked
       end
 
+      handle_milestone_change(merge_request)
+
       added_labels = merge_request.labels - old_labels
       if added_labels.present?
         notification_service.async.relabeled_merge_request(
@@ -105,6 +107,18 @@ module MergeRequests
 
     private
 
+    def handle_milestone_change(merge_request)
+      return if skip_milestone_email
+
+      return unless merge_request.previous_changes.include?('milestone_id')
+
+      if merge_request.milestone.nil?
+        notification_service.async.removed_milestone_merge_request(merge_request, current_user)
+      else
+        notification_service.async.changed_milestone_merge_request(merge_request, merge_request.milestone, current_user)
+      end
+    end
+
     def create_branch_change_note(issuable, branch_type, old_branch, new_branch)
       SystemNoteService.change_branch(
         issuable, issuable.project, current_user, branch_type,
diff --git a/app/services/milestones/destroy_service.rb b/app/services/milestones/destroy_service.rb
index 7cda802c120..87c7a282081 100644
--- a/app/services/milestones/destroy_service.rb
+++ b/app/services/milestones/destroy_service.rb
@@ -4,7 +4,7 @@ module Milestones
   class DestroyService < Milestones::BaseService
     def execute(milestone)
       Milestone.transaction do
-        update_params = { milestone: nil }
+        update_params = { milestone: nil, skip_milestone_email: true }
 
         milestone.issues.each do |issue|
           Issues::UpdateService.new(parent, current_user, update_params).execute(issue)
diff --git a/app/services/notification_service.rb b/app/services/notification_service.rb
index 50fa373025b..fb9c18ea75d 100644
--- a/app/services/notification_service.rb
+++ b/app/services/notification_service.rb
@@ -129,6 +129,14 @@ class NotificationService
     relabeled_resource_email(issue, added_labels, current_user, :relabeled_issue_email)
   end
 
+  def removed_milestone_issue(issue, current_user)
+    removed_milestone_resource_email(issue, current_user, :removed_milestone_issue_email)
+  end
+
+  def changed_milestone_issue(issue, new_milestone, current_user)
+    changed_milestone_resource_email(issue, new_milestone, current_user, :changed_milestone_issue_email)
+  end
+
   # When create a merge request we should send an email to:
   #
   #  * mr author
@@ -138,7 +146,6 @@ class NotificationService
   #  * users with custom level checked with "new merge request"
   #
   # In EE, approvers of the merge request are also included
-  #
   def new_merge_request(merge_request, current_user)
     new_resource_email(merge_request, :new_merge_request_email)
   end
@@ -208,6 +215,14 @@ class NotificationService
     relabeled_resource_email(merge_request, added_labels, current_user, :relabeled_merge_request_email)
   end
 
+  def removed_milestone_merge_request(merge_request, current_user)
+    removed_milestone_resource_email(merge_request, current_user, :removed_milestone_merge_request_email)
+  end
+
+  def changed_milestone_merge_request(merge_request, new_milestone, current_user)
+    changed_milestone_resource_email(merge_request, new_milestone, current_user, :changed_milestone_merge_request_email)
+  end
+
   def close_mr(merge_request, current_user)
     close_resource_email(merge_request, current_user, :closed_merge_request_email)
   end
@@ -500,6 +515,30 @@ class NotificationService
     end
   end
 
+  def removed_milestone_resource_email(target, current_user, method)
+    recipients = NotificationRecipientService.build_recipients(
+      target,
+      current_user,
+      action: 'removed_milestone'
+    )
+
+    recipients.each do |recipient|
+      mailer.send(method, recipient.user.id, target.id, current_user.id).deliver_later
+    end
+  end
+
+  def changed_milestone_resource_email(target, milestone, current_user, method)
+    recipients = NotificationRecipientService.build_recipients(
+      target,
+      current_user,
+      action: 'changed_milestone'
+    )
+
+    recipients.each do |recipient|
+      mailer.send(method, recipient.user.id, target.id, milestone, current_user.id).deliver_later
+    end
+  end
+
   def reopen_resource_email(target, current_user, method, status)
     recipients = NotificationRecipientService.build_recipients(target, current_user, action: "reopen")
 
diff --git a/app/views/projects/clusters/_advanced_settings.html.haml b/app/views/clusters/clusters/_advanced_settings.html.haml
index 243e8cd9ba0..7037c80aa6b 100644
--- a/app/views/projects/clusters/_advanced_settings.html.haml
+++ b/app/views/clusters/clusters/_advanced_settings.html.haml
@@ -12,4 +12,4 @@
       = s_('ClusterIntegration|Remove Kubernetes cluster integration')
     %p
       = s_("ClusterIntegration|Remove this Kubernetes cluster's configuration from this project. This will not delete your actual Kubernetes cluster.")
-    = link_to(s_('ClusterIntegration|Remove integration'), namespace_project_cluster_path(@project.namespace, @project, @cluster.id), method: :delete, class: 'btn btn-danger', data: { confirm: s_("ClusterIntegration|Are you sure you want to remove this Kubernetes cluster's integration? This will not delete your actual Kubernetes cluster.")})
+    = link_to(s_('ClusterIntegration|Remove integration'), clusterable.cluster_path(@cluster), method: :delete, class: 'btn btn-danger', data: { confirm: s_("ClusterIntegration|Are you sure you want to remove this Kubernetes cluster's integration? This will not delete your actual Kubernetes cluster.")})
diff --git a/app/views/projects/clusters/_banner.html.haml b/app/views/clusters/clusters/_banner.html.haml
index 73cfea0ef92..73cfea0ef92 100644
--- a/app/views/projects/clusters/_banner.html.haml
+++ b/app/views/clusters/clusters/_banner.html.haml
diff --git a/app/views/projects/clusters/_cluster.html.haml b/app/views/clusters/clusters/_cluster.html.haml
index 2d7f7c6b1fb..facbcb7fc59 100644
--- a/app/views/projects/clusters/_cluster.html.haml
+++ b/app/views/clusters/clusters/_cluster.html.haml
@@ -2,7 +2,7 @@
   .table-section.section-30
     .table-mobile-header{ role: "rowheader" }= s_("ClusterIntegration|Kubernetes cluster")
     .table-mobile-content
-      = link_to cluster.name, namespace_project_cluster_path(@project.namespace, @project, cluster)
+      = link_to cluster.name, cluster.show_path
   .table-section.section-30
     .table-mobile-header{ role: "rowheader" }= s_("ClusterIntegration|Environment scope")
     .table-mobile-content= cluster.environment_scope
@@ -16,7 +16,7 @@
         class: "#{'is-checked' if cluster.enabled?} #{'is-disabled' if !cluster.can_toggle_cluster?}",
         "aria-label": s_("ClusterIntegration|Toggle Kubernetes Cluster"),
         disabled: !cluster.can_toggle_cluster?,
-        data: { endpoint: namespace_project_cluster_path(@project.namespace, @project, cluster, format: :json) } }
+        data: { endpoint: clusterable.cluster_path(cluster, format: :json) } }
         %input.js-project-feature-toggle-input{ type: "hidden", value: cluster.enabled? }
         = icon("spinner spin", class: "loading-icon")
         %span.toggle-icon
diff --git a/app/views/projects/clusters/_empty_state.html.haml b/app/views/clusters/clusters/_empty_state.html.haml
index b8a3556a206..800e76d92ef 100644
--- a/app/views/projects/clusters/_empty_state.html.haml
+++ b/app/views/clusters/clusters/_empty_state.html.haml
@@ -7,6 +7,6 @@
       - link_to_help_page = link_to(_('Learn more about Kubernetes'), help_page_path('user/project/clusters/index'), target: '_blank', rel: 'noopener noreferrer')
       %p= s_('ClusterIntegration|Kubernetes clusters allow you to use review apps, deploy your applications, run your pipelines, and much more in an easy way. %{link_to_help_page}').html_safe % { link_to_help_page: link_to_help_page}
 
-      - if can?(current_user, :create_cluster, @project)
+      - if clusterable.can_create_cluster?
         .text-center
-          = link_to s_('ClusterIntegration|Add Kubernetes cluster'), new_project_cluster_path(@project), class: 'btn btn-success'
+          = link_to s_('ClusterIntegration|Add Kubernetes cluster'), clusterable.new_path, class: 'btn btn-success'
diff --git a/app/views/projects/clusters/_gcp_signup_offer_banner.html.haml b/app/views/clusters/clusters/_gcp_signup_offer_banner.html.haml
index 73b11d509d3..73b11d509d3 100644
--- a/app/views/projects/clusters/_gcp_signup_offer_banner.html.haml
+++ b/app/views/clusters/clusters/_gcp_signup_offer_banner.html.haml
diff --git a/app/views/projects/clusters/_integration_form.html.haml b/app/views/clusters/clusters/_integration_form.html.haml
index d0a553e3414..5e451f60c9d 100644
--- a/app/views/projects/clusters/_integration_form.html.haml
+++ b/app/views/clusters/clusters/_integration_form.html.haml
@@ -1,4 +1,4 @@
-= form_for @cluster, url: namespace_project_cluster_path(@project.namespace, @project, @cluster), as: :cluster do |field|
+= form_for @cluster, url: clusterable.cluster_path(@cluster), as: :cluster do |field|
   = form_errors(@cluster)
   .form-group
     %h5= s_('ClusterIntegration|Integration status')
@@ -13,7 +13,7 @@
           = sprite_icon('status_failed_borderless', size: 16, css_class: 'toggle-icon-svg toggle-status-unchecked')
       .form-text.text-muted= s_('ClusterIntegration|Enable or disable GitLab\'s connection to your Kubernetes cluster.')
 
-  - if has_multiple_clusters?(@project)
+  - if has_multiple_clusters?
     .form-group
       %h5= s_('ClusterIntegration|Environment scope')
       = field.text_field :environment_scope, class: 'col-md-6 form-control js-select-on-focus', placeholder: s_('ClusterIntegration|Environment scope')
@@ -23,7 +23,7 @@
     .form-group
       = field.submit _('Save changes'), class: 'btn btn-success'
 
-  - unless has_multiple_clusters?(@project)
+  - unless has_multiple_clusters?
     %h5= s_('ClusterIntegration|Environment scope')
     %p
       %code *
diff --git a/app/views/projects/clusters/_sidebar.html.haml b/app/views/clusters/clusters/_sidebar.html.haml
index 3d10348212f..3d10348212f 100644
--- a/app/views/projects/clusters/_sidebar.html.haml
+++ b/app/views/clusters/clusters/_sidebar.html.haml
diff --git a/app/views/projects/clusters/gcp/_form.html.haml b/app/views/clusters/clusters/gcp/_form.html.haml
index 171ceeceb68..ad842036a62 100644
--- a/app/views/projects/clusters/gcp/_form.html.haml
+++ b/app/views/clusters/clusters/gcp/_form.html.haml
@@ -12,14 +12,14 @@
 
 %p= link_to('Select a different Google account', @authorize_url)
 
-= form_for @gcp_cluster, html: { class: 'js-gke-cluster-creation prepend-top-20', data: { token: token_in_session } }, url:  create_gcp_namespace_project_clusters_path(@project.namespace, @project), as: :cluster do |field|
+= form_for @gcp_cluster, html: { class: 'js-gke-cluster-creation prepend-top-20', data: { token: token_in_session } }, url: clusterable.create_gcp_clusters_path, as: :cluster do |field|
   = form_errors(@gcp_cluster)
   .form-group
     = field.label :name, s_('ClusterIntegration|Kubernetes cluster name'), class: 'label-bold'
     = field.text_field :name, class: 'form-control', placeholder: s_('ClusterIntegration|Kubernetes cluster name')
   .form-group
     = field.label :environment_scope, s_('ClusterIntegration|Environment scope'), class: 'label-bold'
-    = field.text_field :environment_scope, class: 'form-control', readonly: !has_multiple_clusters?(@project), placeholder: s_('ClusterIntegration|Environment scope')
+    = field.text_field :environment_scope, class: 'form-control', readonly: !has_multiple_clusters?, placeholder: s_('ClusterIntegration|Environment scope')
 
   = field.fields_for :provider_gcp, @gcp_cluster.provider_gcp do |provider_gcp_field|
     .form-group
diff --git a/app/views/projects/clusters/gcp/_header.html.haml b/app/views/clusters/clusters/gcp/_header.html.haml
index a2ad3cd64df..a2ad3cd64df 100644
--- a/app/views/projects/clusters/gcp/_header.html.haml
+++ b/app/views/clusters/clusters/gcp/_header.html.haml
diff --git a/app/views/projects/clusters/gcp/_show.html.haml b/app/views/clusters/clusters/gcp/_show.html.haml
index 779c9c245c1..6021b220285 100644
--- a/app/views/projects/clusters/gcp/_show.html.haml
+++ b/app/views/clusters/clusters/gcp/_show.html.haml
@@ -6,7 +6,7 @@
     %span.input-group-append
       = clipboard_button(text: @cluster.name, title: s_('ClusterIntegration|Copy Kubernetes cluster name'), class: 'input-group-text btn-default')
 
-= form_for @cluster, url: namespace_project_cluster_path(@project.namespace, @project, @cluster), as: :cluster do |field|
+= form_for @cluster, url: clusterable.cluster_path(@cluster), as: :cluster do |field|
   = form_errors(@cluster)
 
   = field.fields_for :platform_kubernetes, @cluster.platform_kubernetes do |platform_kubernetes_field|
diff --git a/app/views/projects/clusters/index.html.haml b/app/views/clusters/clusters/index.html.haml
index a55de84b5cd..a55de84b5cd 100644
--- a/app/views/projects/clusters/index.html.haml
+++ b/app/views/clusters/clusters/index.html.haml
diff --git a/app/views/projects/clusters/new.html.haml b/app/views/clusters/clusters/new.html.haml
index a38003f5750..eeeef6bd824 100644
--- a/app/views/projects/clusters/new.html.haml
+++ b/app/views/clusters/clusters/new.html.haml
@@ -19,9 +19,9 @@
 
     .tab-content.gitlab-tab-content
       .tab-pane{ id: 'create-gcp-cluster-pane', class: active_when(active_tab == 'gcp'), role: 'tabpanel' }
-        = render 'projects/clusters/gcp/header'
+        = render 'clusters/clusters/gcp/header'
         - if @valid_gcp_token
-          = render 'projects/clusters/gcp/form'
+          = render 'clusters/clusters/gcp/form'
         - elsif @authorize_url
           .signin-with-google
             = link_to(image_tag('auth_buttons/signin_with_google.png', width: '191px'), @authorize_url)
@@ -32,5 +32,5 @@
           = s_('Google authentication is not %{link_to_documentation}. Ask your GitLab administrator if you want to use this service.').html_safe % { link_to_documentation: link }
 
       .tab-pane{ id: 'add-user-cluster-pane', class: active_when(active_tab == 'user'), role: 'tabpanel' }
-        = render 'projects/clusters/user/header'
-        = render 'projects/clusters/user/form'
+        = render 'clusters/clusters/user/header'
+        = render 'clusters/clusters/user/form'
diff --git a/app/views/projects/clusters/show.html.haml b/app/views/clusters/clusters/show.html.haml
index c79d3f67706..7ea85fe43d6 100644
--- a/app/views/projects/clusters/show.html.haml
+++ b/app/views/clusters/clusters/show.html.haml
@@ -1,25 +1,26 @@
 - @content_class = "limit-container-width" unless fluid_layout
-- add_to_breadcrumbs "Kubernetes Clusters", project_clusters_path(@project)
+- add_to_breadcrumbs "Kubernetes Clusters", clusterable.index_path
 - breadcrumb_title @cluster.name
 - page_title _("Kubernetes Cluster")
+- manage_prometheus_path = edit_project_service_path(@cluster.project, 'prometheus') if @project
 
 - expanded = Rails.env.test?
 
-- status_path = status_namespace_project_cluster_path(@cluster.project.namespace, @cluster.project, @cluster.id, format: :json) if can?(current_user, :admin_cluster, @cluster)
+- status_path = clusterable.cluster_status_cluster_path(@cluster.id, format: :json) if can?(current_user, :admin_cluster, @cluster)
 .edit-cluster-form.js-edit-cluster-form{ data: { status_path: status_path,
-  install_helm_path: install_applications_namespace_project_cluster_path(@cluster.project.namespace, @cluster.project, @cluster, :helm),
-  install_ingress_path: install_applications_namespace_project_cluster_path(@cluster.project.namespace, @cluster.project, @cluster, :ingress),
-  install_prometheus_path: install_applications_namespace_project_cluster_path(@cluster.project.namespace, @cluster.project, @cluster, :prometheus),
-  install_runner_path: install_applications_namespace_project_cluster_path(@cluster.project.namespace, @cluster.project, @cluster, :runner),
-  install_jupyter_path: install_applications_namespace_project_cluster_path(@cluster.project.namespace, @cluster.project, @cluster, :jupyter),
-  install_knative_path: install_applications_namespace_project_cluster_path(@cluster.project.namespace, @cluster.project, @cluster, :knative),
+  install_helm_path: clusterable.install_applications_cluster_path(@cluster, :helm),
+  install_ingress_path: clusterable.install_applications_cluster_path(@cluster, :ingress),
+  install_prometheus_path: clusterable.install_applications_cluster_path(@cluster, :prometheus),
+  install_runner_path: clusterable.install_applications_cluster_path(@cluster, :runner),
+  install_jupyter_path: clusterable.install_applications_cluster_path(@cluster, :jupyter),
+  install_knative_path: clusterable.install_applications_cluster_path(@cluster, :knative),
   toggle_status: @cluster.enabled? ? 'true': 'false',
   cluster_status: @cluster.status_name,
   cluster_status_reason: @cluster.status_reason,
   help_path: help_page_path('user/project/clusters/index.md', anchor: 'installing-applications'),
   ingress_help_path: help_page_path('user/project/clusters/index.md', anchor: 'getting-the-external-ip-address'),
   ingress_dns_help_path: help_page_path('topics/autodevops/quick_start_guide.md', anchor: 'point-dns-at-cluster-ip'),
-  manage_prometheus_path: edit_project_service_path(@cluster.project, 'prometheus') } }
+  manage_prometheus_path: manage_prometheus_path } }
 
   .js-cluster-application-notice
     .flash-container
@@ -39,9 +40,9 @@
       %p= s_('ClusterIntegration|See and edit the details for your Kubernetes cluster')
     .settings-content
       - if @cluster.managed?
-        = render 'projects/clusters/gcp/show'
+        = render 'clusters/clusters/gcp/show'
       - else
-        = render 'projects/clusters/user/show'
+        = render 'clusters/clusters/user/show'
 
   %section.settings.no-animate#js-cluster-advanced-settings{ class: ('expanded' if expanded) }
     .settings-header
diff --git a/app/views/projects/clusters/user/_form.html.haml b/app/views/clusters/clusters/user/_form.html.haml
index 54a6e685bb0..4e6232b69de 100644
--- a/app/views/projects/clusters/user/_form.html.haml
+++ b/app/views/clusters/clusters/user/_form.html.haml
@@ -1,9 +1,9 @@
-= form_for @user_cluster, url: create_user_namespace_project_clusters_path(@project.namespace, @project), as: :cluster do |field|
+= form_for @user_cluster, url: clusterable.create_user_clusters_path, as: :cluster do |field|
   = form_errors(@user_cluster)
   .form-group
     = field.label :name, s_('ClusterIntegration|Kubernetes cluster name'), class: 'label-bold'
     = field.text_field :name, class: 'form-control', placeholder: s_('ClusterIntegration|Kubernetes cluster name')
-  - if has_multiple_clusters?(@project)
+  - if has_multiple_clusters?
     .form-group
       = field.label :environment_scope, s_('ClusterIntegration|Environment scope'), class: 'label-bold'
       = field.text_field :environment_scope, class: 'form-control', placeholder: s_('ClusterIntegration|Environment scope')
diff --git a/app/views/projects/clusters/user/_header.html.haml b/app/views/clusters/clusters/user/_header.html.haml
index 749177fa6c1..749177fa6c1 100644
--- a/app/views/projects/clusters/user/_header.html.haml
+++ b/app/views/clusters/clusters/user/_header.html.haml
diff --git a/app/views/projects/clusters/user/_show.html.haml b/app/views/clusters/clusters/user/_show.html.haml
index 5b57f7ceb7d..a871fef0240 100644
--- a/app/views/projects/clusters/user/_show.html.haml
+++ b/app/views/clusters/clusters/user/_show.html.haml
@@ -1,4 +1,4 @@
-= form_for @cluster, url: namespace_project_cluster_path(@project.namespace, @project, @cluster), as: :cluster do |field|
+= form_for @cluster, url: clusterable.cluster_path(@cluster), as: :cluster do |field|
   = form_errors(@cluster)
   .form-group
     = field.label :name, s_('ClusterIntegration|Kubernetes cluster name'), class: 'label-bold'
diff --git a/app/views/notify/changed_milestone_issue_email.html.haml b/app/views/notify/changed_milestone_issue_email.html.haml
new file mode 100644
index 00000000000..7d5425fc72d
--- /dev/null
+++ b/app/views/notify/changed_milestone_issue_email.html.haml
@@ -0,0 +1,3 @@
+%p
+  Milestone changed to
+  %strong= link_to(@milestone.name, @milestone_url)
diff --git a/app/views/notify/changed_milestone_issue_email.text.erb b/app/views/notify/changed_milestone_issue_email.text.erb
new file mode 100644
index 00000000000..c5fc0b61518
--- /dev/null
+++ b/app/views/notify/changed_milestone_issue_email.text.erb
@@ -0,0 +1 @@
+Milestone changed to <%= @milestone.name %> ( <%= @milestone_url %> )
diff --git a/app/views/notify/changed_milestone_merge_request_email.html.haml b/app/views/notify/changed_milestone_merge_request_email.html.haml
new file mode 100644
index 00000000000..7d5425fc72d
--- /dev/null
+++ b/app/views/notify/changed_milestone_merge_request_email.html.haml
@@ -0,0 +1,3 @@
+%p
+  Milestone changed to
+  %strong= link_to(@milestone.name, @milestone_url)
diff --git a/app/views/notify/changed_milestone_merge_request_email.text.erb b/app/views/notify/changed_milestone_merge_request_email.text.erb
new file mode 100644
index 00000000000..c5fc0b61518
--- /dev/null
+++ b/app/views/notify/changed_milestone_merge_request_email.text.erb
@@ -0,0 +1 @@
+Milestone changed to <%= @milestone.name %> ( <%= @milestone_url %> )
diff --git a/app/views/notify/removed_milestone_issue_email.html.haml b/app/views/notify/removed_milestone_issue_email.html.haml
new file mode 100644
index 00000000000..7e9205b6491
--- /dev/null
+++ b/app/views/notify/removed_milestone_issue_email.html.haml
@@ -0,0 +1,2 @@
+%p
+  Milestone removed
diff --git a/app/views/notify/removed_milestone_issue_email.text.erb b/app/views/notify/removed_milestone_issue_email.text.erb
new file mode 100644
index 00000000000..0b83ed7a4c5
--- /dev/null
+++ b/app/views/notify/removed_milestone_issue_email.text.erb
@@ -0,0 +1 @@
+Milestone removed
diff --git a/app/views/notify/removed_milestone_merge_request_email.html.haml b/app/views/notify/removed_milestone_merge_request_email.html.haml
new file mode 100644
index 00000000000..7e9205b6491
--- /dev/null
+++ b/app/views/notify/removed_milestone_merge_request_email.html.haml
@@ -0,0 +1,2 @@
+%p
+  Milestone removed
diff --git a/app/views/notify/removed_milestone_merge_request_email.text.erb b/app/views/notify/removed_milestone_merge_request_email.text.erb
new file mode 100644
index 00000000000..0b83ed7a4c5
--- /dev/null
+++ b/app/views/notify/removed_milestone_merge_request_email.text.erb
@@ -0,0 +1 @@
+Milestone removed
diff --git a/app/views/shared/boards/components/sidebar/_labels.html.haml b/app/views/shared/boards/components/sidebar/_labels.html.haml
index 6138914206b..19159684420 100644
--- a/app/views/shared/boards/components/sidebar/_labels.html.haml
+++ b/app/views/shared/boards/components/sidebar/_labels.html.haml
@@ -19,13 +19,13 @@
         ":value" => "label.id" }
       .dropdown
         %button.dropdown-menu-toggle.js-label-select.js-multiselect.js-issue-board-sidebar{ type: "button",
-          "v-bind:data-selected" => "selectedLabels",
+          ":data-selected" => "selectedLabels",
+          ":data-labels" => "issue.assignableLabelsEndpoint",
           data: { toggle: "dropdown",
             field_name: "issue[label_names][]",
             show_no: "true",
             show_any: "true",
             project_id: @project&.try(:id),
-            labels: labels_filter_path_with_defaults,
             namespace_path: @namespace_path,
             project_path: @project.try(:path) } }
           %span.dropdown-toggle-text
diff --git a/app/workers/all_queues.yml b/app/workers/all_queues.yml
index f21789de37d..a66a6f4c777 100644
--- a/app/workers/all_queues.yml
+++ b/app/workers/all_queues.yml
@@ -28,6 +28,7 @@
 - gcp_cluster:cluster_wait_for_app_installation
 - gcp_cluster:wait_for_cluster_creation
 - gcp_cluster:cluster_wait_for_ingress_ip_address
+- gcp_cluster:cluster_platform_configure
 
 - github_import_advance_stage
 - github_importer:github_import_import_diff_note
diff --git a/app/workers/cluster_platform_configure_worker.rb b/app/workers/cluster_platform_configure_worker.rb
new file mode 100644
index 00000000000..68e8335a09d
--- /dev/null
+++ b/app/workers/cluster_platform_configure_worker.rb
@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+class ClusterPlatformConfigureWorker
+  include ApplicationWorker
+  include ClusterQueue
+
+  def perform(cluster_id)
+    Clusters::Cluster.find_by_id(cluster_id).try do |cluster|
+      next unless cluster.cluster_project
+
+      kubernetes_namespace = cluster.find_or_initialize_kubernetes_namespace(cluster.cluster_project)
+
+      Clusters::Gcp::Kubernetes::CreateOrUpdateNamespaceService.new(
+        cluster: cluster,
+        kubernetes_namespace: kubernetes_namespace
+      ).execute
+    end
+
+  rescue ::Kubeclient::HttpError => err
+    Rails.logger.error "Failed to create/update Kubernetes Namespace. id: #{kubernetes_namespace.id} message: #{err.message}"
+  end
+end
diff --git a/app/workers/cluster_provision_worker.rb b/app/workers/cluster_provision_worker.rb
index 59de7903c1c..3d5894b73ec 100644
--- a/app/workers/cluster_provision_worker.rb
+++ b/app/workers/cluster_provision_worker.rb
@@ -9,6 +9,8 @@ class ClusterProvisionWorker
       cluster.provider.try do |provider|
         Clusters::Gcp::ProvisionService.new.execute(provider) if cluster.gcp?
       end
+
+      ClusterPlatformConfigureWorker.perform_async(cluster.id) if cluster.user?
     end
   end
 end