Add ability to embed metrics

See https://gitlab.com/gitlab-org/gitlab-ce/issues/30423

15 files changed, 410 insertions, 50 deletions

diff --git a/app/assets/javascripts/behaviors/markdown/render_gfm.js b/app/assets/javascripts/behaviors/markdown/render_gfm.js
index bfb073fdcdc..789a057caf8 100644
--- a/app/assets/javascripts/behaviors/markdown/render_gfm.js
+++ b/app/assets/javascripts/behaviors/markdown/render_gfm.js
@@ -2,6 +2,7 @@ import $ from 'jquery';
 import syntaxHighlight from '~/syntax_highlight';
 import renderMath from './render_math';
 import renderMermaid from './render_mermaid';
+import renderMetrics from './render_metrics';
 import highlightCurrentUser from './highlight_current_user';
 import initUserPopovers from '../../user_popovers';
 import initMRPopovers from '../../mr_popover';
@@ -17,6 +18,9 @@ $.fn.renderGFM = function renderGFM() {
   highlightCurrentUser(this.find('.gfm-project_member').get());
   initUserPopovers(this.find('.gfm-project_member').get());
   initMRPopovers(this.find('.gfm-merge_request').get());
+  if (gon.features && gon.features.gfmEmbeddedMetrics) {
+    renderMetrics(this.find('.js-render-metrics').get());
+  }
   return this;
 };
 
diff --git a/app/assets/javascripts/behaviors/markdown/render_metrics.js b/app/assets/javascripts/behaviors/markdown/render_metrics.js
new file mode 100644
index 00000000000..252b98610b6
--- /dev/null
+++ b/app/assets/javascripts/behaviors/markdown/render_metrics.js
@@ -0,0 +1,24 @@
+import Vue from 'vue';
+import Metrics from '~/monitoring/components/embed.vue';
+import { createStore } from '~/monitoring/stores';
+
+// TODO: Handle copy-pasting - https://gitlab.com/gitlab-org/gitlab-ce/issues/64369.
+export default function renderMetrics(elements) {
+  if (!elements.length) {
+    return;
+  }
+
+  elements.forEach(element => {
+    const { dashboardUrl } = element.dataset;
+    const MetricsComponent = Vue.extend(Metrics);
+
+    // eslint-disable-next-line no-new
+    new MetricsComponent({
+      el: element,
+      store: createStore(),
+      propsData: {
+        dashboardUrl,
+      },
+    });
+  });
+}
diff --git a/app/assets/javascripts/monitoring/components/charts/area.vue b/app/assets/javascripts/monitoring/components/charts/area.vue
index 454ff4f284e..edf9423c74c 100644
--- a/app/assets/javascripts/monitoring/components/charts/area.vue
+++ b/app/assets/javascripts/monitoring/components/charts/area.vue
@@ -37,7 +37,13 @@ export default {
     },
     projectPath: {
       type: String,
-      required: true,
+      required: false,
+      default: () => '',
+    },
+    showBorder: {
+      type: Boolean,
+      required: false,
+      default: () => false,
     },
     thresholds: {
       type: Array,
@@ -234,52 +240,54 @@ export default {
 </script>
 
 <template>
-  <div class="prometheus-graph col-12 col-lg-6">
-    <div class="prometheus-graph-header">
-      <h5 ref="graphTitle" class="prometheus-graph-title">{{ graphData.title }}</h5>
-      <div ref="graphWidgets" class="prometheus-graph-widgets"><slot></slot></div>
-    </div>
-    <gl-area-chart
-      ref="areaChart"
-      v-bind="$attrs"
-      :data="chartData"
-      :option="chartOptions"
-      :format-tooltip-text="formatTooltipText"
-      :thresholds="thresholds"
-      :width="width"
-      :height="height"
-      @updated="onChartUpdated"
-    >
-      <template v-if="tooltip.isDeployment">
-        <template slot="tooltipTitle">
-          {{ __('Deployed') }}
-        </template>
-        <div slot="tooltipContent" class="d-flex align-items-center">
-          <icon name="commit" class="mr-2" />
-          <gl-link :href="tooltip.commitUrl">{{ tooltip.sha }}</gl-link>
-        </div>
-      </template>
-      <template v-else>
-        <template slot="tooltipTitle">
-          <div class="text-nowrap">
-            {{ tooltip.title }}
+  <div class="col-12 col-lg-6" :class="[showBorder ? 'p-2' : 'p-0']">
+    <div class="prometheus-graph" :class="{ 'prometheus-graph-embed w-100 p-3': showBorder }">
+      <div class="prometheus-graph-header">
+        <h5 ref="graphTitle" class="prometheus-graph-title">{{ graphData.title }}</h5>
+        <div ref="graphWidgets" class="prometheus-graph-widgets"><slot></slot></div>
+      </div>
+      <gl-area-chart
+        ref="areaChart"
+        v-bind="$attrs"
+        :data="chartData"
+        :option="chartOptions"
+        :format-tooltip-text="formatTooltipText"
+        :thresholds="thresholds"
+        :width="width"
+        :height="height"
+        @updated="onChartUpdated"
+      >
+        <template v-if="tooltip.isDeployment">
+          <template slot="tooltipTitle">
+            {{ __('Deployed') }}
+          </template>
+          <div slot="tooltipContent" class="d-flex align-items-center">
+            <icon name="commit" class="mr-2" />
+            <gl-link :href="tooltip.commitUrl">{{ tooltip.sha }}</gl-link>
           </div>
         </template>
-        <template slot="tooltipContent">
-          <div
-            v-for="(content, key) in tooltip.content"
-            :key="key"
-            class="d-flex justify-content-between"
-          >
-            <gl-chart-series-label :color="isMultiSeries ? content.color : ''">
-              {{ content.name }}
-            </gl-chart-series-label>
-            <div class="prepend-left-32">
-              {{ content.value }}
+        <template v-else>
+          <template slot="tooltipTitle">
+            <div class="text-nowrap">
+              {{ tooltip.title }}
             </div>
-          </div>
+          </template>
+          <template slot="tooltipContent">
+            <div
+              v-for="(content, key) in tooltip.content"
+              :key="key"
+              class="d-flex justify-content-between"
+            >
+              <gl-chart-series-label :color="isMultiSeries ? content.color : ''">
+                {{ content.name }}
+              </gl-chart-series-label>
+              <div class="prepend-left-32">
+                {{ content.value }}
+              </div>
+            </div>
+          </template>
         </template>
-      </template>
-    </gl-area-chart>
+      </gl-area-chart>
+    </div>
   </div>
 </template>
diff --git a/app/assets/javascripts/monitoring/components/dashboard.vue b/app/assets/javascripts/monitoring/components/dashboard.vue
index 6eaced0c108..c7c55880040 100644
--- a/app/assets/javascripts/monitoring/components/dashboard.vue
+++ b/app/assets/javascripts/monitoring/components/dashboard.vue
@@ -11,10 +11,9 @@ import MonitorSingleStatChart from './charts/single_stat.vue';
 import PanelType from './panel_type.vue';
 import GraphGroup from './graph_group.vue';
 import EmptyState from './empty_state.vue';
-import { timeWindows, timeWindowsKeyNames } from '../constants';
+import { sidebarAnimationDuration, timeWindows, timeWindowsKeyNames } from '../constants';
 import { getTimeDiff } from '../utils';
 
-const sidebarAnimationDuration = 150;
 let sidebarMutationObserver;
 
 export default {
@@ -370,8 +369,8 @@ export default {
     </div>
     <div v-if="!showEmptyState">
       <graph-group
-        v-for="(groupData, index) in groupsWithData"
-        :key="index"
+        v-for="groupData in groupsWithData"
+        :key="`${groupData.group}.${groupData.priority}`"
         :name="groupData.group"
         :show-panels="showPanels"
       >
diff --git a/app/assets/javascripts/monitoring/components/embed.vue b/app/assets/javascripts/monitoring/components/embed.vue
new file mode 100644
index 00000000000..e17f03de0fd
--- /dev/null
+++ b/app/assets/javascripts/monitoring/components/embed.vue
@@ -0,0 +1,97 @@
+<script>
+import { mapActions, mapState } from 'vuex';
+import GraphGroup from './graph_group.vue';
+import MonitorAreaChart from './charts/area.vue';
+import { sidebarAnimationDuration, timeWindowsKeyNames, timeWindows } from '../constants';
+import { getTimeDiff } from '../utils';
+
+let sidebarMutationObserver;
+
+export default {
+  components: {
+    GraphGroup,
+    MonitorAreaChart,
+  },
+  props: {
+    dashboardUrl: {
+      type: String,
+      required: true,
+    },
+  },
+  data() {
+    return {
+      params: {
+        ...getTimeDiff(timeWindows[timeWindowsKeyNames.eightHours]),
+      },
+      elWidth: 0,
+    };
+  },
+  computed: {
+    ...mapState('monitoringDashboard', ['groups', 'metricsWithData']),
+    groupData() {
+      const groupsWithData = this.groups.filter(group => this.chartsWithData(group.metrics).length);
+      if (groupsWithData.length) {
+        return groupsWithData[0];
+      }
+      return null;
+    },
+  },
+  mounted() {
+    this.setInitialState();
+    this.fetchMetricsData(this.params);
+    sidebarMutationObserver = new MutationObserver(this.onSidebarMutation);
+    sidebarMutationObserver.observe(document.querySelector('.layout-page'), {
+      attributes: true,
+      childList: false,
+      subtree: false,
+    });
+  },
+  beforeDestroy() {
+    if (sidebarMutationObserver) {
+      sidebarMutationObserver.disconnect();
+    }
+  },
+  methods: {
+    ...mapActions('monitoringDashboard', [
+      'fetchMetricsData',
+      'setEndpoints',
+      'setFeatureFlags',
+      'setShowErrorBanner',
+    ]),
+    chartsWithData(charts) {
+      return charts.filter(chart =>
+        chart.metrics.some(metric => this.metricsWithData.includes(metric.metric_id)),
+      );
+    },
+    onSidebarMutation() {
+      setTimeout(() => {
+        this.elWidth = this.$el.clientWidth;
+      }, sidebarAnimationDuration);
+    },
+    setInitialState() {
+      this.setFeatureFlags({
+        prometheusEndpointEnabled: true,
+      });
+      this.setEndpoints({
+        dashboardEndpoint: this.dashboardUrl,
+      });
+      this.setShowErrorBanner(false);
+    },
+  },
+};
+</script>
+<template>
+  <div class="metrics-embed">
+    <div v-if="groupData" class="row w-100 m-n2 pb-4">
+      <monitor-area-chart
+        v-for="graphData in chartsWithData(groupData.metrics)"
+        :key="graphData.title"
+        :graph-data="graphData"
+        :container-width="elWidth"
+        group-id="monitor-area-chart"
+        :project-path="null"
+        :show-border="true"
+      />
+    </div>
+  </div>
+</template>
diff --git a/app/assets/javascripts/monitoring/constants.js b/app/assets/javascripts/monitoring/constants.js
index 26f1bf3f68d..605c95e6da5 100644
--- a/app/assets/javascripts/monitoring/constants.js
+++ b/app/assets/javascripts/monitoring/constants.js
@@ -1,5 +1,7 @@
 import { __ } from '~/locale';
 
+export const sidebarAnimationDuration = 300; // milliseconds.
+
 export const chartHeight = 300;
 
 export const graphTypes = {
diff --git a/app/assets/javascripts/monitoring/stores/actions.js b/app/assets/javascripts/monitoring/stores/actions.js
index 5b3da51e9a6..245cc2eaca3 100644
--- a/app/assets/javascripts/monitoring/stores/actions.js
+++ b/app/assets/javascripts/monitoring/stores/actions.js
@@ -44,6 +44,10 @@ export const setFeatureFlags = (
   commit(types.SET_ADDITIONAL_PANEL_TYPES_ENABLED, additionalPanelTypesEnabled);
 };
 
+export const setShowErrorBanner = ({ commit }, enabled) => {
+  commit(types.SET_SHOW_ERROR_BANNER, enabled);
+};
+
 export const requestMetricsDashboard = ({ commit }) => {
   commit(types.REQUEST_METRICS_DATA);
 };
@@ -99,7 +103,9 @@ export const fetchMetricsData = ({ state, dispatch }, params) => {
     })
     .catch(error => {
       dispatch('receiveMetricsDataFailure', error);
-      createFlash(s__('Metrics|There was an error while retrieving metrics'));
+      if (state.setShowErrorBanner) {
+        createFlash(s__('Metrics|There was an error while retrieving metrics'));
+      }
     });
 };
 
@@ -119,7 +125,9 @@ export const fetchDashboard = ({ state, dispatch }, params) => {
     })
     .catch(error => {
       dispatch('receiveMetricsDashboardFailure', error);
-      createFlash(s__('Metrics|There was an error while retrieving metrics'));
+      if (state.setShowErrorBanner) {
+        createFlash(s__('Metrics|There was an error while retrieving metrics'));
+      }
     });
 };
 
diff --git a/app/assets/javascripts/monitoring/stores/mutation_types.js b/app/assets/javascripts/monitoring/stores/mutation_types.js
index c89daba3df7..4b1aadbcf05 100644
--- a/app/assets/javascripts/monitoring/stores/mutation_types.js
+++ b/app/assets/javascripts/monitoring/stores/mutation_types.js
@@ -16,3 +16,4 @@ export const SET_ALL_DASHBOARDS = 'SET_ALL_DASHBOARDS';
 export const SET_ENDPOINTS = 'SET_ENDPOINTS';
 export const SET_GETTING_STARTED_EMPTY_STATE = 'SET_GETTING_STARTED_EMPTY_STATE';
 export const SET_NO_DATA_EMPTY_STATE = 'SET_NO_DATA_EMPTY_STATE';
+export const SET_SHOW_ERROR_BANNER = 'SET_SHOW_ERROR_BANNER';
diff --git a/app/assets/javascripts/monitoring/stores/mutations.js b/app/assets/javascripts/monitoring/stores/mutations.js
index 0104dcb867d..b19520d6638 100644
--- a/app/assets/javascripts/monitoring/stores/mutations.js
+++ b/app/assets/javascripts/monitoring/stores/mutations.js
@@ -96,4 +96,7 @@ export default {
   [types.SET_ADDITIONAL_PANEL_TYPES_ENABLED](state, enabled) {
     state.additionalPanelTypesEnabled = enabled;
   },
+  [types.SET_SHOW_ERROR_BANNER](state, enabled) {
+    state.showErrorBanner = enabled;
+  },
 };
diff --git a/app/assets/javascripts/monitoring/stores/state.js b/app/assets/javascripts/monitoring/stores/state.js
index e54bb712695..440bdc951e0 100644
--- a/app/assets/javascripts/monitoring/stores/state.js
+++ b/app/assets/javascripts/monitoring/stores/state.js
@@ -12,6 +12,7 @@ export default () => ({
   additionalPanelTypesEnabled: false,
   emptyState: 'gettingStarted',
   showEmptyState: true,
+  showErrorBanner: true,
   groups: [],
   deploymentData: [],
   environments: [],
diff --git a/app/assets/stylesheets/pages/prometheus.scss b/app/assets/stylesheets/pages/prometheus.scss
index 2d600e3aef6..05a4cc168a8 100644
--- a/app/assets/stylesheets/pages/prometheus.scss
+++ b/app/assets/stylesheets/pages/prometheus.scss
@@ -29,6 +29,11 @@
   padding: $gl-padding / 2;
 }
 
+.prometheus-graph-embed {
+  border: 1px solid $border-color;
+  border-radius: $border-radius-default;
+}
+
 .prometheus-graph-header {
   display: flex;
   align-items: center;
diff --git a/spec/frontend/behaviors/markdown/render_metrics_spec.js b/spec/frontend/behaviors/markdown/render_metrics_spec.js
new file mode 100644
index 00000000000..6db0eabc16b
--- /dev/null
+++ b/spec/frontend/behaviors/markdown/render_metrics_spec.js
@@ -0,0 +1,37 @@
+import Vue from 'vue';
+import renderMetrics from '~/behaviors/markdown/render_metrics';
+import { TEST_HOST } from 'helpers/test_constants';
+
+const originalExtend = Vue.extend;
+
+describe('Render metrics for Gitlab Flavoured Markdown', () => {
+  const container = {
+    Metrics() {},
+  };
+
+  let spyExtend;
+
+  beforeEach(() => {
+    Vue.extend = () => container.Metrics;
+    spyExtend = jest.spyOn(Vue, 'extend');
+  });
+
+  afterEach(() => {
+    Vue.extend = originalExtend;
+  });
+
+  it('does nothing when no elements are found', () => {
+    renderMetrics([]);
+
+    expect(spyExtend).not.toHaveBeenCalled();
+  });
+
+  it('renders a vue component when elements are found', () => {
+    const element = document.createElement('div');
+    element.setAttribute('data-dashboard-url', TEST_HOST);
+
+    renderMetrics([element]);
+
+    expect(spyExtend).toHaveBeenCalled();
+  });
+});
diff --git a/spec/frontend/monitoring/embed/embed_spec.js b/spec/frontend/monitoring/embed/embed_spec.js
new file mode 100644
index 00000000000..3b18a0f77c7
--- /dev/null
+++ b/spec/frontend/monitoring/embed/embed_spec.js
@@ -0,0 +1,78 @@
+import { createLocalVue, shallowMount } from '@vue/test-utils';
+import Vuex from 'vuex';
+import Embed from '~/monitoring/components/embed.vue';
+import MonitorAreaChart from '~/monitoring/components/charts/area.vue';
+import { TEST_HOST } from 'helpers/test_constants';
+import { groups, initialState, metricsData, metricsWithData } from './mock_data';
+
+const localVue = createLocalVue();
+localVue.use(Vuex);
+
+describe('Embed', () => {
+  let wrapper;
+  let store;
+  let actions;
+
+  function mountComponent() {
+    wrapper = shallowMount(Embed, {
+      localVue,
+      store,
+      propsData: {
+        dashboardUrl: TEST_HOST,
+      },
+    });
+  }
+
+  beforeEach(() => {
+    actions = {
+      setFeatureFlags: () => {},
+      setShowErrorBanner: () => {},
+      setEndpoints: () => {},
+      fetchMetricsData: () => {},
+    };
+
+    store = new Vuex.Store({
+      modules: {
+        monitoringDashboard: {
+          namespaced: true,
+          actions,
+          state: initialState,
+        },
+      },
+    });
+  });
+
+  afterEach(() => {
+    if (wrapper) {
+      wrapper.destroy();
+    }
+  });
+
+  describe('no metrics are available yet', () => {
+    beforeEach(() => {
+      mountComponent();
+    });
+
+    it('shows an empty state when no metrics are present', () => {
+      expect(wrapper.find('.metrics-embed').exists()).toBe(true);
+      expect(wrapper.find(MonitorAreaChart).exists()).toBe(false);
+    });
+  });
+
+  describe('metrics are available', () => {
+    beforeEach(() => {
+      store.state.monitoringDashboard.groups = groups;
+      store.state.monitoringDashboard.groups[0].metrics = metricsData;
+      store.state.monitoringDashboard.metricsWithData = metricsWithData;
+
+      mountComponent();
+    });
+
+    it('shows a chart when metrics are present', () => {
+      wrapper.setProps({});
+      expect(wrapper.find('.metrics-embed').exists()).toBe(true);
+      expect(wrapper.find(MonitorAreaChart).exists()).toBe(true);
+      expect(wrapper.findAll(MonitorAreaChart).length).toBe(2);
+    });
+  });
+});
diff --git a/spec/frontend/monitoring/embed/mock_data.js b/spec/frontend/monitoring/embed/mock_data.js
new file mode 100644
index 00000000000..df4acb82e95
--- /dev/null
+++ b/spec/frontend/monitoring/embed/mock_data.js
@@ -0,0 +1,87 @@
+export const metricsWithData = [15, 16];
+
+export const groups = [
+  {
+    panels: [
+      {
+        title: 'Memory Usage (Total)',
+        type: 'area-chart',
+        y_label: 'Total Memory Used',
+        weight: 4,
+        metrics: [
+          {
+            id: 'system_metrics_kubernetes_container_memory_total',
+            metric_id: 15,
+          },
+        ],
+      },
+      {
+        title: 'Core Usage (Total)',
+        type: 'area-chart',
+        y_label: 'Total Cores',
+        weight: 3,
+        metrics: [
+          {
+            id: 'system_metrics_kubernetes_container_cores_total',
+            metric_id: 16,
+          },
+        ],
+      },
+    ],
+  },
+];
+
+export const metrics = [
+  {
+    id: 'system_metrics_kubernetes_container_memory_total',
+    metric_id: 15,
+  },
+  {
+    id: 'system_metrics_kubernetes_container_cores_total',
+    metric_id: 16,
+  },
+];
+
+const queries = [
+  {
+    result: [
+      {
+        values: [
+          ['Mon', 1220],
+          ['Tue', 932],
+          ['Wed', 901],
+          ['Thu', 934],
+          ['Fri', 1290],
+          ['Sat', 1330],
+          ['Sun', 1320],
+        ],
+      },
+    ],
+  },
+];
+
+export const metricsData = [
+  {
+    queries,
+    metrics: [
+      {
+        metric_id: 15,
+      },
+    ],
+  },
+  {
+    queries,
+    metrics: [
+      {
+        metric_id: 16,
+      },
+    ],
+  },
+];
+
+export const initialState = {
+  monitoringDashboard: {},
+  groups: [],
+  metricsWithData: [],
+  useDashboardEndpoint: true,
+};
diff --git a/spec/frontend/test_setup.js b/spec/frontend/test_setup.js
index 634c78ec029..e4d62b044ca 100644
--- a/spec/frontend/test_setup.js
+++ b/spec/frontend/test_setup.js
@@ -69,3 +69,9 @@ Object.entries(jqueryMatchers).forEach(([matcherName, matcherFactory]) => {
 
 // Tech debt issue TBD
 testUtilsConfig.logModifiedComponents = false;
+
+// Basic stub for MutationObserver
+global.MutationObserver = () => ({
+  disconnect: () => {},
+  observe: () => {},
+});