diff --git a/.gitignore b/.gitignore
index 65befc20963..6bec6d2596f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -82,3 +82,4 @@ jsdoc/
 **/tmp/rubocop_cache/**
 .overcommit.yml
 .projections.json
+/qa/.rakeTasks
diff --git a/Gemfile b/Gemfile
index ffe456cae08..d3689e4a211 100644
--- a/Gemfile
+++ b/Gemfile
@@ -159,6 +159,7 @@ gem 'icalendar'
 
 # Diffs
 gem 'diffy', '~> 3.1.0'
+gem 'diff_match_patch', '~> 0.1.0'
 
 # Application server
 gem 'rack', '~> 2.0.7'
diff --git a/Gemfile.lock b/Gemfile.lock
index 7582eb28e49..5951eb4bf71 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -224,6 +224,7 @@ GEM
       railties
       rotp (~> 2.0)
     diff-lcs (1.3)
+    diff_match_patch (0.1.0)
     diffy (3.1.0)
     discordrb-webhooks-blackst0ne (3.3.0)
       rest-client (~> 2.0)
@@ -1133,6 +1134,7 @@ DEPENDENCIES
   device_detector
   devise (~> 4.6)
   devise-two-factor (~> 3.0.0)
+  diff_match_patch (~> 0.1.0)
   diffy (~> 3.1.0)
   discordrb-webhooks-blackst0ne (~> 3.3)
   doorkeeper (~> 4.3)
diff --git a/app/assets/javascripts/helpers/monitor_helper.js b/app/assets/javascripts/helpers/monitor_helper.js
index 900f0cf5bb8..d172aa8a444 100644
--- a/app/assets/javascripts/helpers/monitor_helper.js
+++ b/app/assets/javascripts/helpers/monitor_helper.js
@@ -1,11 +1,9 @@
-/* eslint-disable import/prefer-default-export */
-import _ from 'underscore';
-
 /**
  * @param {Array} queryResults - Array of Result objects
  * @param {Object} defaultConfig - Default chart config values (e.g. lineStyle, name)
  * @returns {Array} The formatted values
  */
+// eslint-disable-next-line import/prefer-default-export
 export const makeDataSeries = (queryResults, defaultConfig) =>
   queryResults
     .map(result => {
@@ -19,10 +17,13 @@ export const makeDataSeries = (queryResults, defaultConfig) =>
       if (name) {
         series.name = `${defaultConfig.name}: ${name}`;
       } else {
-        const template = _.template(defaultConfig.name, {
-          interpolate: /\{\{(.+?)\}\}/g,
+        series.name = defaultConfig.name;
+        Object.keys(result.metric).forEach(templateVar => {
+          const value = result.metric[templateVar];
+          const regex = new RegExp(`{{\\s*${templateVar}\\s*}}`, 'g');
+
+          series.name = series.name.replace(regex, value);
         });
-        series.name = template(result.metric);
       }
 
       return { ...defaultConfig, ...series };
diff --git a/app/assets/javascripts/issue.js b/app/assets/javascripts/issue.js
index a9e086fade8..9136a47d542 100644
--- a/app/assets/javascripts/issue.js
+++ b/app/assets/javascripts/issue.js
@@ -1,4 +1,4 @@
-/* eslint-disable no-var, one-var, consistent-return */
+/* eslint-disable consistent-return */
 
 import $ from 'jquery';
 import axios from './lib/utils/axios_utils';
@@ -91,18 +91,17 @@ export default class Issue {
       'click',
       '.js-issuable-actions a.btn-close, .js-issuable-actions a.btn-reopen',
       e => {
-        var $button, shouldSubmit, url;
         e.preventDefault();
         e.stopImmediatePropagation();
-        $button = $(e.currentTarget);
-        shouldSubmit = $button.hasClass('btn-comment');
+        const $button = $(e.currentTarget);
+        const shouldSubmit = $button.hasClass('btn-comment');
         if (shouldSubmit) {
           Issue.submitNoteForm($button.closest('form'));
         }
 
         this.disableCloseReopenButton($button);
 
-        url = $button.attr('href');
+        const url = $button.attr('href');
         return axios
           .put(url)
           .then(({ data }) => {
@@ -139,16 +138,14 @@ export default class Issue {
   }
 
   static submitNoteForm(form) {
-    var noteText;
-    noteText = form.find('textarea.js-note-text').val();
+    const noteText = form.find('textarea.js-note-text').val();
     if (noteText && noteText.trim().length > 0) {
       return form.submit();
     }
   }
 
   static initRelatedBranches() {
-    var $container;
-    $container = $('#related-branches');
+    const $container = $('#related-branches');
     return axios
       .get($container.data('url'))
       .then(({ data }) => {
diff --git a/app/assets/javascripts/labels_select.js b/app/assets/javascripts/labels_select.js
index 72de3b5d726..6abf723be9a 100644
--- a/app/assets/javascripts/labels_select.js
+++ b/app/assets/javascripts/labels_select.js
@@ -1,4 +1,4 @@
-/* eslint-disable no-useless-return, func-names, no-var, no-underscore-dangle, one-var, no-new, consistent-return, no-shadow, no-param-reassign, vars-on-top, no-lonely-if, no-else-return, dot-notation, no-empty */
+/* eslint-disable no-useless-return, func-names, no-underscore-dangle, no-new, consistent-return, no-shadow, no-param-reassign, no-lonely-if, no-else-return, dot-notation, no-empty */
 /* global Issuable */
 /* global ListLabel */
 
@@ -15,63 +15,39 @@ import { isScopedLabel } from '~/lib/utils/common_utils';
 
 export default class LabelsSelect {
   constructor(els, options = {}) {
-    var _this, $els;
-    _this = this;
+    const _this = this;
 
-    $els = $(els);
+    let $els = $(els);
 
     if (!els) {
       $els = $('.js-label-select');
     }
 
     $els.each((i, dropdown) => {
-      var $block,
-        $dropdown,
-        $form,
-        $loading,
-        $selectbox,
-        $sidebarCollapsedValue,
-        $value,
-        $dropdownMenu,
-        abilityName,
-        defaultLabel,
-        issueUpdateURL,
-        labelUrl,
-        namespacePath,
-        projectPath,
-        saveLabelData,
-        selectedLabel,
-        showAny,
-        showNo,
-        $sidebarLabelTooltip,
-        initialSelected,
-        fieldName,
-        showMenuAbove,
-        $dropdownContainer;
-      $dropdown = $(dropdown);
-      $dropdownContainer = $dropdown.closest('.labels-filter');
-      namespacePath = $dropdown.data('namespacePath');
-      projectPath = $dropdown.data('projectPath');
-      issueUpdateURL = $dropdown.data('issueUpdate');
-      selectedLabel = $dropdown.data('selected');
+      const $dropdown = $(dropdown);
+      const $dropdownContainer = $dropdown.closest('.labels-filter');
+      const namespacePath = $dropdown.data('namespacePath');
+      const projectPath = $dropdown.data('projectPath');
+      const issueUpdateURL = $dropdown.data('issueUpdate');
+      let selectedLabel = $dropdown.data('selected');
       if (selectedLabel != null && !$dropdown.hasClass('js-multiselect')) {
         selectedLabel = selectedLabel.split(',');
       }
-      showNo = $dropdown.data('showNo');
-      showAny = $dropdown.data('showAny');
-      showMenuAbove = $dropdown.data('showMenuAbove');
-      defaultLabel = $dropdown.data('defaultLabel') || __('Label');
-      abilityName = $dropdown.data('abilityName');
-      $selectbox = $dropdown.closest('.selectbox');
-      $block = $selectbox.closest('.block');
-      $form = $dropdown.closest('form, .js-issuable-update');
-      $sidebarCollapsedValue = $block.find('.sidebar-collapsed-icon span');
-      $sidebarLabelTooltip = $block.find('.js-sidebar-labels-tooltip');
-      $value = $block.find('.value');
-      $dropdownMenu = $dropdown.parent().find('.dropdown-menu');
-      $loading = $block.find('.block-loading').fadeOut();
-      fieldName = $dropdown.data('fieldName');
-      initialSelected = $selectbox
+      const showNo = $dropdown.data('showNo');
+      const showAny = $dropdown.data('showAny');
+      const showMenuAbove = $dropdown.data('showMenuAbove');
+      const defaultLabel = $dropdown.data('defaultLabel') || __('Label');
+      const abilityName = $dropdown.data('abilityName');
+      const $selectbox = $dropdown.closest('.selectbox');
+      const $block = $selectbox.closest('.block');
+      const $form = $dropdown.closest('form, .js-issuable-update');
+      const $sidebarCollapsedValue = $block.find('.sidebar-collapsed-icon span');
+      const $sidebarLabelTooltip = $block.find('.js-sidebar-labels-tooltip');
+      const $value = $block.find('.value');
+      const $dropdownMenu = $dropdown.parent().find('.dropdown-menu');
+      const $loading = $block.find('.block-loading').fadeOut();
+      const fieldName = $dropdown.data('fieldName');
+      let initialSelected = $selectbox
         .find(`input[name="${$dropdown.data('fieldName')}"]`)
         .map(function() {
           return this.value;
@@ -90,9 +66,8 @@ export default class LabelsSelect {
         );
       }
 
-      saveLabelData = function() {
-        var data, selected;
-        selected = $dropdown
+      const saveLabelData = function() {
+        const selected = $dropdown
           .closest('.selectbox')
           .find(`input[name='${fieldName}']`)
           .map(function() {
@@ -103,7 +78,7 @@ export default class LabelsSelect {
         if (_.isEqual(initialSelected, selected)) return;
         initialSelected = selected;
 
-        data = {};
+        const data = {};
         data[abilityName] = {};
         data[abilityName].label_ids = selected;
         if (!selected.length) {
@@ -114,12 +89,13 @@ export default class LabelsSelect {
         axios
           .put(issueUpdateURL, data)
           .then(({ data }) => {
-            var labelCount, template, labelTooltipTitle, labelTitles;
+            let labelTooltipTitle;
+            let template;
             $loading.fadeOut();
             $dropdown.trigger('loaded.gl.dropdown');
             $selectbox.hide();
             data.issueUpdateURL = issueUpdateURL;
-            labelCount = 0;
+            let labelCount = 0;
             if (data.labels.length && issueUpdateURL) {
               template = LabelsSelect.getLabelTemplate({
                 labels: _.sortBy(data.labels, 'title'),
@@ -174,7 +150,7 @@ export default class LabelsSelect {
             $sidebarCollapsedValue.text(labelCount);
 
             if (data.labels.length) {
-              labelTitles = data.labels.map(label => label.title);
+              let labelTitles = data.labels.map(label => label.title);
 
               if (labelTitles.length > 5) {
                 labelTitles = labelTitles.slice(0, 5);
@@ -199,13 +175,13 @@ export default class LabelsSelect {
       $dropdown.glDropdown({
         showMenuAbove,
         data(term, callback) {
-          labelUrl = $dropdown.attr('data-labels');
+          const labelUrl = $dropdown.attr('data-labels');
           axios
             .get(labelUrl)
             .then(res => {
               let { data } = res;
               if ($dropdown.hasClass('js-extra-options')) {
-                var extraData = [];
+                const extraData = [];
                 if (showNo) {
                   extraData.unshift({
                     id: 0,
@@ -232,22 +208,14 @@ export default class LabelsSelect {
             .catch(() => flash(__('Error fetching labels.')));
         },
         renderRow(label) {
-          var linkEl,
-            listItemEl,
-            colorEl,
-            indeterminate,
-            removesAll,
-            selectedClass,
-            i,
-            marked,
-            dropdownValue;
+          let colorEl;
 
-          selectedClass = [];
-          removesAll = label.id <= 0 || label.id == null;
+          const selectedClass = [];
+          const removesAll = label.id <= 0 || label.id == null;
 
           if ($dropdown.hasClass('js-filter-bulk-update')) {
-            indeterminate = $dropdown.data('indeterminate') || [];
-            marked = $dropdown.data('marked') || [];
+            const indeterminate = $dropdown.data('indeterminate') || [];
+            const marked = $dropdown.data('marked') || [];
 
             if (indeterminate.indexOf(label.id) !== -1) {
               selectedClass.push('is-indeterminate');
@@ -255,7 +223,7 @@ export default class LabelsSelect {
 
             if (marked.indexOf(label.id) !== -1) {
               // Remove is-indeterminate class if the item will be marked as active
-              i = selectedClass.indexOf('is-indeterminate');
+              const i = selectedClass.indexOf('is-indeterminate');
               if (i !== -1) {
                 selectedClass.splice(i, 1);
               }
@@ -263,7 +231,7 @@ export default class LabelsSelect {
             }
           } else {
             if (this.id(label)) {
-              dropdownValue = this.id(label)
+              const dropdownValue = this.id(label)
                 .toString()
                 .replace(/'/g, "\\'");
 
@@ -287,7 +255,7 @@ export default class LabelsSelect {
             colorEl = '';
           }
 
-          linkEl = document.createElement('a');
+          const linkEl = document.createElement('a');
           linkEl.href = '#';
 
           // We need to identify which items are actually labels
@@ -300,7 +268,7 @@ export default class LabelsSelect {
           linkEl.className = selectedClass.join(' ');
           linkEl.innerHTML = `${colorEl} ${_.escape(label.title)}`;
 
-          listItemEl = document.createElement('li');
+          const listItemEl = document.createElement('li');
           listItemEl.appendChild(linkEl);
 
           return listItemEl;
@@ -312,12 +280,12 @@ export default class LabelsSelect {
         filterable: true,
         selected: $dropdown.data('selected') || [],
         toggleLabel(selected, el) {
-          var $dropdownParent = $dropdown.parent();
-          var $dropdownInputField = $dropdownParent.find('.dropdown-input-field');
-          var isSelected = el !== null ? el.hasClass('is-active') : false;
+          const $dropdownParent = $dropdown.parent();
+          const $dropdownInputField = $dropdownParent.find('.dropdown-input-field');
+          const isSelected = el !== null ? el.hasClass('is-active') : false;
 
-          var title = selected ? selected.title : null;
-          var selectedLabels = this.selected;
+          const title = selected ? selected.title : null;
+          const selectedLabels = this.selected;
 
           if ($dropdownInputField.length && $dropdownInputField.val().length) {
             $dropdownParent.find('.dropdown-input-clear').trigger('click');
@@ -329,7 +297,7 @@ export default class LabelsSelect {
           } else if (isSelected) {
             this.selected.push(title);
           } else if (!isSelected && title) {
-            var index = this.selected.indexOf(title);
+            const index = this.selected.indexOf(title);
             this.selected.splice(index, 1);
           }
 
@@ -359,10 +327,9 @@ export default class LabelsSelect {
           }
         },
         hidden() {
-          var isIssueIndex, isMRIndex, page;
-          page = $('body').attr('data-page');
-          isIssueIndex = page === 'projects:issues:index';
-          isMRIndex = page === 'projects:merge_requests:index';
+          const page = $('body').attr('data-page');
+          const isIssueIndex = page === 'projects:issues:index';
+          const isMRIndex = page === 'projects:merge_requests:index';
           $selectbox.hide();
           // display:block overrides the hide-collapse rule
           $value.removeAttr('style');
@@ -393,14 +360,13 @@ export default class LabelsSelect {
           const { $el, e, isMarking } = clickEvent;
           const label = clickEvent.selectedObj;
 
-          var isIssueIndex, isMRIndex, page, boardsModel;
-          var fadeOutLoader = () => {
+          const fadeOutLoader = () => {
             $loading.fadeOut();
           };
 
-          page = $('body').attr('data-page');
-          isIssueIndex = page === 'projects:issues:index';
-          isMRIndex = page === 'projects:merge_requests:index';
+          const page = $('body').attr('data-page');
+          const isIssueIndex = page === 'projects:issues:index';
+          const isMRIndex = page === 'projects:merge_requests:index';
 
           if ($dropdown.parent().find('.is-active:not(.dropdown-clear-active)').length) {
             $dropdown
@@ -419,6 +385,7 @@ export default class LabelsSelect {
             return;
           }
 
+          let boardsModel;
           if ($dropdown.closest('.add-issues-modal').length) {
             boardsModel = ModalStore.store.filter;
           }
@@ -450,7 +417,7 @@ export default class LabelsSelect {
                 }),
               );
             } else {
-              var { labels } = boardsStore.detail.issue;
+              let { labels } = boardsStore.detail.issue;
               labels = labels.filter(selectedLabel => selectedLabel.id !== label.id);
               boardsStore.detail.issue.labels = labels;
             }
@@ -578,16 +545,14 @@ export default class LabelsSelect {
   }
   // eslint-disable-next-line class-methods-use-this
   setDropdownData($dropdown, isMarking, value) {
-    var i, markedIds, unmarkedIds, indeterminateIds;
-
-    markedIds = $dropdown.data('marked') || [];
-    unmarkedIds = $dropdown.data('unmarked') || [];
-    indeterminateIds = $dropdown.data('indeterminate') || [];
+    const markedIds = $dropdown.data('marked') || [];
+    const unmarkedIds = $dropdown.data('unmarked') || [];
+    const indeterminateIds = $dropdown.data('indeterminate') || [];
 
     if (isMarking) {
       markedIds.push(value);
 
-      i = indeterminateIds.indexOf(value);
+      let i = indeterminateIds.indexOf(value);
       if (i > -1) {
         indeterminateIds.splice(i, 1);
       }
@@ -598,7 +563,7 @@ export default class LabelsSelect {
       }
     } else {
       // If marked item (not common) is unmarked
-      i = markedIds.indexOf(value);
+      const i = markedIds.indexOf(value);
       if (i > -1) {
         markedIds.splice(i, 1);
       }
diff --git a/app/assets/javascripts/monitoring/stores/actions.js b/app/assets/javascripts/monitoring/stores/actions.js
index a670becf91a..6a8e3cc82f5 100644
--- a/app/assets/javascripts/monitoring/stores/actions.js
+++ b/app/assets/javascripts/monitoring/stores/actions.js
@@ -84,7 +84,10 @@ export const fetchDashboard = ({ state, dispatch }, params) => {
   return backOffRequest(() => axios.get(state.dashboardEndpoint, { params }))
     .then(resp => resp.data)
     .then(response => {
-      dispatch('receiveMetricsDashboardSuccess', { response, params });
+      dispatch('receiveMetricsDashboardSuccess', {
+        response,
+        params,
+      });
     })
     .catch(error => {
       dispatch('receiveMetricsDashboardFailure', error);
diff --git a/app/assets/javascripts/monitoring/stores/mutations.js b/app/assets/javascripts/monitoring/stores/mutations.js
index 26d4c56ca78..696af5aed75 100644
--- a/app/assets/javascripts/monitoring/stores/mutations.js
+++ b/app/assets/javascripts/monitoring/stores/mutations.js
@@ -94,7 +94,7 @@ export default {
     state.emptyState = 'noData';
   },
   [types.SET_ALL_DASHBOARDS](state, dashboards) {
-    state.allDashboards = dashboards;
+    state.allDashboards = dashboards || [];
   },
   [types.SET_SHOW_ERROR_BANNER](state, enabled) {
     state.showErrorBanner = enabled;
diff --git a/app/assets/javascripts/notes/components/note_header.vue b/app/assets/javascripts/notes/components/note_header.vue
index 3158e086f6c..e4f09492d9c 100644
--- a/app/assets/javascripts/notes/components/note_header.vue
+++ b/app/assets/javascripts/notes/components/note_header.vue
@@ -101,6 +101,7 @@ export default {
           <time-ago-tooltip :time="createdAt" tooltip-placement="bottom" />
         </a>
       </template>
+      <slot name="extra-controls"></slot>
       <i
         class="fa fa-spinner fa-spin editing-spinner"
         :aria-label="__('Comment is being updated')"
diff --git a/app/assets/javascripts/notes/mixins/description_version_history.js b/app/assets/javascripts/notes/mixins/description_version_history.js
new file mode 100644
index 00000000000..12d80f3faa2
--- /dev/null
+++ b/app/assets/javascripts/notes/mixins/description_version_history.js
@@ -0,0 +1,12 @@
+// Placeholder for GitLab FOSS
+// Actual implementation: ee/app/assets/javascripts/notes/mixins/description_version_history.js
+export default {
+  computed: {
+    canSeeDescriptionVersion() {},
+    shouldShowDescriptionVersion() {},
+    descriptionVersionToggleIcon() {},
+  },
+  methods: {
+    toggleDescriptionVersion() {},
+  },
+};
diff --git a/app/assets/javascripts/notes/stores/actions.js b/app/assets/javascripts/notes/stores/actions.js
index 004035ea1d4..82c291379ec 100644
--- a/app/assets/javascripts/notes/stores/actions.js
+++ b/app/assets/javascripts/notes/stores/actions.js
@@ -12,6 +12,7 @@ import service from '../services/notes_service';
 import loadAwardsHandler from '../../awards_handler';
 import sidebarTimeTrackingEventHub from '../../sidebar/event_hub';
 import { isInViewport, scrollToElement, isInMRPage } from '../../lib/utils/common_utils';
+import { mergeUrlParams } from '../../lib/utils/url_utility';
 import mrWidgetEventHub from '../../vue_merge_request_widget/event_hub';
 import { __ } from '~/locale';
 import Api from '~/api';
@@ -475,5 +476,20 @@ export const convertToDiscussion = ({ commit }, noteId) =>
 export const removeConvertedDiscussion = ({ commit }, noteId) =>
   commit(types.REMOVE_CONVERTED_DISCUSSION, noteId);
 
+export const fetchDescriptionVersion = (_, { endpoint, startingVersion }) => {
+  let requestUrl = endpoint;
+
+  if (startingVersion) {
+    requestUrl = mergeUrlParams({ start_version_id: startingVersion }, requestUrl);
+  }
+
+  return axios
+    .get(requestUrl)
+    .then(res => res.data)
+    .catch(() => {
+      Flash(__('Something went wrong while fetching description changes. Please try again.'));
+    });
+};
+
 // prevent babel-plugin-rewire from generating an invalid default during karma tests
 export default () => {};
diff --git a/app/assets/javascripts/notes/stores/collapse_utils.js b/app/assets/javascripts/notes/stores/collapse_utils.js
index bee6d4f0329..3cdcc7a05b8 100644
--- a/app/assets/javascripts/notes/stores/collapse_utils.js
+++ b/app/assets/javascripts/notes/stores/collapse_utils.js
@@ -1,34 +1,9 @@
-import { n__, s__, sprintf } from '~/locale';
 import { DESCRIPTION_TYPE } from '../constants';
 
-/**
- * Changes the description from a note, returns 'changed the description n number of times'
- */
-export const changeDescriptionNote = (note, descriptionChangedTimes, timeDifferenceMinutes) => {
-  const descriptionNote = Object.assign({}, note);
-
-  descriptionNote.note_html = sprintf(
-    s__(`MergeRequest|
-  %{paragraphStart}changed the description %{descriptionChangedTimes} times %{timeDifferenceMinutes}%{paragraphEnd}`),
-    {
-      paragraphStart: '<p dir="auto">',
-      paragraphEnd: '</p>',
-      descriptionChangedTimes,
-      timeDifferenceMinutes: n__('within %d minute ', 'within %d minutes ', timeDifferenceMinutes),
-    },
-    false,
-  );
-
-  descriptionNote.times_updated = descriptionChangedTimes;
-
-  return descriptionNote;
-};
-
 /**
  * Checks the time difference between two notes from their 'created_at' dates
  * returns an integer
  */
-
 export const getTimeDifferenceMinutes = (noteBeggining, noteEnd) => {
   const descriptionNoteBegin = new Date(noteBeggining.created_at);
   const descriptionNoteEnd = new Date(noteEnd.created_at);
@@ -57,7 +32,6 @@ export const isDescriptionSystemNote = note => note.system && note.note === DESC
 export const collapseSystemNotes = notes => {
   let lastDescriptionSystemNote = null;
   let lastDescriptionSystemNoteIndex = -1;
-  let descriptionChangedTimes = 1;
 
   return notes.slice(0).reduce((acc, currentNote) => {
     const note = currentNote.notes[0];
@@ -70,32 +44,24 @@ export const collapseSystemNotes = notes => {
       } else if (lastDescriptionSystemNote) {
         const timeDifferenceMinutes = getTimeDifferenceMinutes(lastDescriptionSystemNote, note);
 
-        // are they less than 10 minutes apart?
-        if (timeDifferenceMinutes > 10) {
-          // reset counter
-          descriptionChangedTimes = 1;
+        // are they less than 10 minutes apart from the same user?
+        if (timeDifferenceMinutes > 10 || note.author.id !== lastDescriptionSystemNote.author.id) {
           // update the previous system note
           lastDescriptionSystemNote = note;
           lastDescriptionSystemNoteIndex = acc.length;
         } else {
-          // increase counter
-          descriptionChangedTimes += 1;
+          // set the first version to fetch grouped system note versions
+          note.start_description_version_id = lastDescriptionSystemNote.description_version_id;
 
           // delete the previous one
           acc.splice(lastDescriptionSystemNoteIndex, 1);
 
-          // replace the text of the current system note with the collapsed note.
-          currentNote.notes.splice(
-            0,
-            1,
-            changeDescriptionNote(note, descriptionChangedTimes, timeDifferenceMinutes),
-          );
-
           // update the previous system note index
           lastDescriptionSystemNoteIndex = acc.length;
         }
       }
     }
+
     acc.push(currentNote);
     return acc;
   }, []);
diff --git a/app/assets/javascripts/registry/components/collapsible_container.vue b/app/assets/javascripts/registry/components/collapsible_container.vue
index 95f8270b5d0..5a6f9370564 100644
--- a/app/assets/javascripts/registry/components/collapsible_container.vue
+++ b/app/assets/javascripts/registry/components/collapsible_container.vue
@@ -8,12 +8,13 @@ import {
   GlModalDirective,
   GlEmptyState,
 } from '@gitlab/ui';
-import createFlash from '../../flash';
-import ClipboardButton from '../../vue_shared/components/clipboard_button.vue';
-import Icon from '../../vue_shared/components/icon.vue';
+import createFlash from '~/flash';
+import Tracking from '~/tracking';
+import ClipboardButton from '~/vue_shared/components/clipboard_button.vue';
+import Icon from '~/vue_shared/components/icon.vue';
 import TableRegistry from './table_registry.vue';
-import { errorMessages, errorMessagesTypes } from '../constants';
-import { __ } from '../../locale';
+import { DELETE_REPO_ERROR_MESSAGE } from '../constants';
+import { __ } from '~/locale';
 
 export default {
   name: 'CollapsibeContainerRegisty',
@@ -30,6 +31,7 @@ export default {
     GlTooltip: GlTooltipDirective,
     GlModal: GlModalDirective,
   },
+  mixins: [Tracking.mixin({})],
   props: {
     repo: {
       type: Object,
@@ -40,6 +42,10 @@ export default {
     return {
       isOpen: false,
       modalId: `confirm-repo-deletion-modal-${this.repo.id}`,
+      tracking: {
+        category: document.body.dataset.page,
+        label: 'registry_repository_delete',
+      },
     };
   },
   computed: {
@@ -61,15 +67,13 @@ export default {
       }
     },
     handleDeleteRepository() {
+      this.track('confirm_delete', {});
       return this.deleteItem(this.repo)
         .then(() => {
           createFlash(__('This container registry has been scheduled for deletion.'), 'notice');
           this.fetchRepos();
         })
-        .catch(() => this.showError(errorMessagesTypes.DELETE_REPO));
-    },
-    showError(message) {
-      createFlash(errorMessages[message]);
+        .catch(() => createFlash(DELETE_REPO_ERROR_MESSAGE));
     },
   },
 };
@@ -97,10 +101,9 @@ export default {
           v-gl-modal="modalId"
           :title="s__('ContainerRegistry|Remove repository')"
           :aria-label="s__('ContainerRegistry|Remove repository')"
-          data-track-event="click_button"
-          data-track-label="registry_repository_delete"
           class="js-remove-repo btn-inverted"
           variant="danger"
+          @click="track('click_button', {})"
         >
           <icon name="remove" />
         </gl-button>
@@ -124,7 +127,13 @@ export default {
         class="mx-auto my-0"
       />
     </div>
-    <gl-modal :modal-id="modalId" ok-variant="danger" @ok="handleDeleteRepository">
+    <gl-modal
+      ref="deleteModal"
+      :modal-id="modalId"
+      ok-variant="danger"
+      @ok="handleDeleteRepository"
+      @cancel="track('cancel_delete', {})"
+    >
       <template v-slot:modal-title>{{ s__('ContainerRegistry|Remove repository') }}</template>
       <p
         v-html="
diff --git a/app/assets/javascripts/registry/components/table_registry.vue b/app/assets/javascripts/registry/components/table_registry.vue
index 8470fbc2b59..caa5fd4ff4e 100644
--- a/app/assets/javascripts/registry/components/table_registry.vue
+++ b/app/assets/javascripts/registry/components/table_registry.vue
@@ -1,20 +1,15 @@
 <script>
 import { mapActions, mapGetters } from 'vuex';
-import {
-  GlButton,
-  GlFormCheckbox,
-  GlTooltipDirective,
-  GlModal,
-  GlModalDirective,
-} from '@gitlab/ui';
-import { n__, s__, sprintf } from '../../locale';
-import createFlash from '../../flash';
-import ClipboardButton from '../../vue_shared/components/clipboard_button.vue';
-import TablePagination from '../../vue_shared/components/pagination/table_pagination.vue';
-import Icon from '../../vue_shared/components/icon.vue';
-import timeagoMixin from '../../vue_shared/mixins/timeago';
-import { errorMessages, errorMessagesTypes } from '../constants';
-import { numberToHumanSize } from '../../lib/utils/number_utils';
+import { GlButton, GlFormCheckbox, GlTooltipDirective, GlModal } from '@gitlab/ui';
+import Tracking from '~/tracking';
+import { n__, s__, sprintf } from '~/locale';
+import createFlash from '~/flash';
+import ClipboardButton from '~/vue_shared/components/clipboard_button.vue';
+import TablePagination from '~/vue_shared/components/pagination/table_pagination.vue';
+import Icon from '~/vue_shared/components/icon.vue';
+import timeagoMixin from '~/vue_shared/mixins/timeago';
+import { numberToHumanSize } from '~/lib/utils/number_utils';
+import { FETCH_REGISTRY_ERROR_MESSAGE, DELETE_REGISTRY_ERROR_MESSAGE } from '../constants';
 
 export default {
   components: {
@@ -27,7 +22,6 @@ export default {
   },
   directives: {
     GlTooltip: GlTooltipDirective,
-    GlModal: GlModalDirective,
   },
   mixins: [timeagoMixin],
   props: {
@@ -65,12 +59,21 @@ export default {
         this.itemsToBeDeleted.length === 0 ? 1 : this.itemsToBeDeleted.length,
       );
     },
-  },
-  mounted() {
-    this.$refs.deleteModal.$refs.modal.$on('hide', this.removeModalEvents);
+    isMultiDelete() {
+      return this.itemsToBeDeleted.length > 1;
+    },
+    tracking() {
+      return {
+        property: this.repo.name,
+        label: this.isMultiDelete ? 'bulk_registry_tag_delete' : 'registry_tag_delete',
+      };
+    },
   },
   methods: {
     ...mapActions(['fetchList', 'deleteItem', 'multiDeleteItems']),
+    track(action) {
+      Tracking.event(document.body.dataset.page, action, this.tracking);
+    },
     setModalDescription(itemIndex = -1) {
       if (itemIndex === -1) {
         this.modalDescription = sprintf(
@@ -92,17 +95,11 @@ export default {
     formatSize(size) {
       return numberToHumanSize(size);
     },
-    removeModalEvents() {
-      this.$refs.deleteModal.$refs.modal.$off('ok');
-    },
     deleteSingleItem(index) {
       this.setModalDescription(index);
       this.itemsToBeDeleted = [index];
-
-      this.$refs.deleteModal.$refs.modal.$once('ok', () => {
-        this.removeModalEvents();
-        this.handleSingleDelete(this.repo.list[index]);
-      });
+      this.track('click_button');
+      this.$refs.deleteModal.show();
     },
     deleteMultipleItems() {
       this.itemsToBeDeleted = [...this.selectedItems];
@@ -111,17 +108,14 @@ export default {
       } else if (this.selectedItems.length > 1) {
         this.setModalDescription();
       }
-
-      this.$refs.deleteModal.$refs.modal.$once('ok', () => {
-        this.removeModalEvents();
-        this.handleMultipleDelete();
-      });
+      this.track('click_button');
+      this.$refs.deleteModal.show();
     },
     handleSingleDelete(itemToDelete) {
       this.itemsToBeDeleted = [];
       this.deleteItem(itemToDelete)
         .then(() => this.fetchList({ repo: this.repo }))
-        .catch(() => this.showError(errorMessagesTypes.DELETE_REGISTRY));
+        .catch(() => createFlash(DELETE_REGISTRY_ERROR_MESSAGE));
     },
     handleMultipleDelete() {
       const { itemsToBeDeleted } = this;
@@ -134,19 +128,16 @@ export default {
           items: itemsToBeDeleted.map(x => this.repo.list[x].tag),
         })
           .then(() => this.fetchList({ repo: this.repo }))
-          .catch(() => this.showError(errorMessagesTypes.DELETE_REGISTRY));
+          .catch(() => createFlash(DELETE_REGISTRY_ERROR_MESSAGE));
       } else {
-        this.showError(errorMessagesTypes.DELETE_REGISTRY);
+        createFlash(DELETE_REGISTRY_ERROR_MESSAGE);
       }
     },
     onPageChange(pageNumber) {
       this.fetchList({ repo: this.repo, page: pageNumber }).catch(() =>
-        this.showError(errorMessagesTypes.FETCH_REGISTRY),
+        createFlash(FETCH_REGISTRY_ERROR_MESSAGE),
       );
     },
-    showError(message) {
-      createFlash(errorMessages[message]);
-    },
     onSelectAllChange() {
       if (this.selectAllChecked) {
         this.deselectAll();
@@ -179,6 +170,15 @@ export default {
     canDeleteRow(item) {
       return item && item.canDelete && !this.isDeleteDisabled;
     },
+    onDeletionConfirmed() {
+      this.track('confirm_delete');
+      if (this.isMultiDelete) {
+        this.handleMultipleDelete();
+      } else {
+        const index = this.itemsToBeDeleted[0];
+        this.handleSingleDelete(this.repo.list[index]);
+      }
+    },
   },
 };
 </script>
@@ -202,12 +202,10 @@ export default {
           <th>
             <gl-button
               v-if="canDeleteRepo"
+              ref="bulkDeleteButton"
               v-gl-tooltip
-              v-gl-modal="modalId"
               :disabled="!selectedItems || selectedItems.length === 0"
-              class="js-delete-registry float-right"
-              data-track-event="click_button"
-              data-track-label="bulk_registry_tag_delete"
+              class="float-right"
               variant="danger"
               :title="s__('ContainerRegistry|Remove selected tags')"
               :aria-label="s__('ContainerRegistry|Remove selected tags')"
@@ -259,11 +257,8 @@ export default {
           <td class="content action-buttons">
             <gl-button
               v-if="canDeleteRow(item)"
-              v-gl-modal="modalId"
               :title="s__('ContainerRegistry|Remove tag')"
               :aria-label="s__('ContainerRegistry|Remove tag')"
-              data-track-event="click_button"
-              data-track-label="registry_tag_delete"
               variant="danger"
               class="js-delete-registry-row float-right btn-inverted btn-border-color btn-icon"
               @click="deleteSingleItem(index)"
@@ -282,7 +277,13 @@ export default {
       class="js-registry-pagination"
     />
 
-    <gl-modal ref="deleteModal" :modal-id="modalId" ok-variant="danger">
+    <gl-modal
+      ref="deleteModal"
+      :modal-id="modalId"
+      ok-variant="danger"
+      @ok="onDeletionConfirmed"
+      @cancel="track('cancel_delete')"
+    >
       <template v-slot:modal-title>{{ modalAction }}</template>
       <template v-slot:modal-ok>{{ modalAction }}</template>
       <p v-html="modalDescription"></p>
diff --git a/app/assets/javascripts/registry/constants.js b/app/assets/javascripts/registry/constants.js
index 712b0fade3d..db798fb88ac 100644
--- a/app/assets/javascripts/registry/constants.js
+++ b/app/assets/javascripts/registry/constants.js
@@ -1,15 +1,8 @@
 import { __ } from '../locale';
 
-export const errorMessagesTypes = {
-  FETCH_REGISTRY: 'FETCH_REGISTRY',
-  FETCH_REPOS: 'FETCH_REPOS',
-  DELETE_REPO: 'DELETE_REPO',
-  DELETE_REGISTRY: 'DELETE_REGISTRY',
-};
-
-export const errorMessages = {
-  [errorMessagesTypes.FETCH_REGISTRY]: __('Something went wrong while fetching the registry list.'),
-  [errorMessagesTypes.FETCH_REPOS]: __('Something went wrong while fetching the projects.'),
-  [errorMessagesTypes.DELETE_REPO]: __('Something went wrong on our end.'),
-  [errorMessagesTypes.DELETE_REGISTRY]: __('Something went wrong on our end.'),
-};
+export const FETCH_REGISTRY_ERROR_MESSAGE = __(
+  'Something went wrong while fetching the registry list.',
+);
+export const FETCH_REPOS_ERROR_MESSAGE = __('Something went wrong while fetching the projects.');
+export const DELETE_REPO_ERROR_MESSAGE = __('Something went wrong on our end.');
+export const DELETE_REGISTRY_ERROR_MESSAGE = __('Something went wrong on our end.');
diff --git a/app/assets/javascripts/registry/stores/actions.js b/app/assets/javascripts/registry/stores/actions.js
index 2121f518a7a..6afba618486 100644
--- a/app/assets/javascripts/registry/stores/actions.js
+++ b/app/assets/javascripts/registry/stores/actions.js
@@ -1,7 +1,7 @@
 import axios from '~/lib/utils/axios_utils';
 import createFlash from '~/flash';
 import * as types from './mutation_types';
-import { errorMessages, errorMessagesTypes } from '../constants';
+import { FETCH_REPOS_ERROR_MESSAGE, FETCH_REGISTRY_ERROR_MESSAGE } from '../constants';
 
 export const fetchRepos = ({ commit, state }) => {
   commit(types.TOGGLE_MAIN_LOADING);
@@ -14,7 +14,7 @@ export const fetchRepos = ({ commit, state }) => {
     })
     .catch(() => {
       commit(types.TOGGLE_MAIN_LOADING);
-      createFlash(errorMessages[errorMessagesTypes.FETCH_REPOS]);
+      createFlash(FETCH_REPOS_ERROR_MESSAGE);
     });
 };
 
@@ -30,7 +30,7 @@ export const fetchList = ({ commit }, { repo, page }) => {
     })
     .catch(() => {
       commit(types.TOGGLE_REGISTRY_LIST_LOADING, repo);
-      createFlash(errorMessages[errorMessagesTypes.FETCH_REGISTRY]);
+      createFlash(FETCH_REGISTRY_ERROR_MESSAGE);
     });
 };
 
diff --git a/app/assets/javascripts/registry/stores/mutations.js b/app/assets/javascripts/registry/stores/mutations.js
index ea5925247d1..419de848883 100644
--- a/app/assets/javascripts/registry/stores/mutations.js
+++ b/app/assets/javascripts/registry/stores/mutations.js
@@ -1,33 +1,31 @@
 import * as types from './mutation_types';
-import { parseIntPagination, normalizeHeaders } from '../../lib/utils/common_utils';
+import { parseIntPagination, normalizeHeaders } from '~/lib/utils/common_utils';
 
 export default {
   [types.SET_MAIN_ENDPOINT](state, endpoint) {
-    Object.assign(state, { endpoint });
+    state.endpoint = endpoint;
   },
 
   [types.SET_IS_DELETE_DISABLED](state, isDeleteDisabled) {
-    Object.assign(state, { isDeleteDisabled });
+    state.isDeleteDisabled = isDeleteDisabled;
   },
 
   [types.SET_REPOS_LIST](state, list) {
-    Object.assign(state, {
-      repos: list.map(el => ({
-        canDelete: Boolean(el.destroy_path),
-        destroyPath: el.destroy_path,
-        id: el.id,
-        isLoading: false,
-        list: [],
-        location: el.location,
-        name: el.path,
-        tagsPath: el.tags_path,
-        projectId: el.project_id,
-      })),
-    });
+    state.repos = list.map(el => ({
+      canDelete: Boolean(el.destroy_path),
+      destroyPath: el.destroy_path,
+      id: el.id,
+      isLoading: false,
+      list: [],
+      location: el.location,
+      name: el.path,
+      tagsPath: el.tags_path,
+      projectId: el.project_id,
+    }));
   },
 
   [types.TOGGLE_MAIN_LOADING](state) {
-    Object.assign(state, { isLoading: !state.isLoading });
+    state.isLoading = !state.isLoading;
   },
 
   [types.SET_REGISTRY_LIST](state, { repo, resp, headers }) {
diff --git a/app/assets/javascripts/tree.js b/app/assets/javascripts/tree.js
index 69b3d20914a..a530c4a99e2 100644
--- a/app/assets/javascripts/tree.js
+++ b/app/assets/javascripts/tree.js
@@ -1,4 +1,4 @@
-/* eslint-disable func-names, consistent-return, no-var, one-var, no-else-return, class-methods-use-this */
+/* eslint-disable func-names, consistent-return, one-var, no-else-return, class-methods-use-this */
 
 import $ from 'jquery';
 import { visitUrl } from './lib/utils/url_utility';
@@ -9,9 +9,8 @@ export default class TreeView {
     // Code browser tree slider
     // Make the entire tree-item row clickable, but not if clicking another link (like a commit message)
     $('.tree-content-holder .tree-item').on('click', function(e) {
-      var $clickedEl, path;
-      $clickedEl = $(e.target);
-      path = $('.tree-item-file-name a', this).attr('href');
+      const $clickedEl = $(e.target);
+      const path = $('.tree-item-file-name a', this).attr('href');
       if (!$clickedEl.is('a') && !$clickedEl.is('.str-truncated')) {
         if (e.metaKey || e.which === 2) {
           e.preventDefault();
@@ -26,11 +25,10 @@ export default class TreeView {
   }
 
   initKeyNav() {
-    var li, liSelected;
-    li = $('tr.tree-item');
-    liSelected = null;
+    const li = $('tr.tree-item');
+    let liSelected = null;
     return $('body').keydown(e => {
-      var next, path;
+      let next, path;
       if ($('input:focus').length > 0 && (e.which === 38 || e.which === 40)) {
         return false;
       }
diff --git a/app/assets/javascripts/vue_shared/components/notes/system_note.vue b/app/assets/javascripts/vue_shared/components/notes/system_note.vue
index d6dfe9eded8..f8e010c4f42 100644
--- a/app/assets/javascripts/vue_shared/components/notes/system_note.vue
+++ b/app/assets/javascripts/vue_shared/components/notes/system_note.vue
@@ -17,9 +17,11 @@
  *   />
  */
 import $ from 'jquery';
-import { mapGetters } from 'vuex';
+import { mapGetters, mapActions } from 'vuex';
+import { GlSkeletonLoading } from '@gitlab/ui';
 import noteHeader from '~/notes/components/note_header.vue';
 import Icon from '~/vue_shared/components/icon.vue';
+import descriptionVersionHistoryMixin from 'ee_else_ce/notes/mixins/description_version_history';
 import TimelineEntryItem from './timeline_entry_item.vue';
 import { spriteIcon } from '../../../lib/utils/common_utils';
 import initMRPopovers from '~/mr_popover/';
@@ -32,7 +34,9 @@ export default {
     Icon,
     noteHeader,
     TimelineEntryItem,
+    GlSkeletonLoading,
   },
+  mixins: [descriptionVersionHistoryMixin],
   props: {
     note: {
       type: Object,
@@ -75,13 +79,16 @@ export default {
   mounted() {
     initMRPopovers(this.$el.querySelectorAll('.gfm-merge_request'));
   },
+  methods: {
+    ...mapActions(['fetchDescriptionVersion']),
+  },
 };
 </script>
 
 <template>
   <timeline-entry-item
     :id="noteAnchorId"
-    :class="{ target: isTargetNote }"
+    :class="{ target: isTargetNote, 'pr-0': shouldShowDescriptionVersion }"
     class="note system-note note-wrapper"
   >
     <div class="timeline-icon" v-html="iconHtml"></div>
@@ -89,14 +96,18 @@ export default {
       <div class="note-header">
         <note-header :author="note.author" :created-at="note.created_at" :note-id="note.id">
           <span v-html="actionTextHtml"></span>
+          <template v-if="canSeeDescriptionVersion" slot="extra-controls">
+            &middot;
+            <button type="button" class="btn-blank btn-link" @click="toggleDescriptionVersion">
+              {{ __('Compare with previous version') }}
+              <icon :name="descriptionVersionToggleIcon" :size="12" class="append-left-5" />
+            </button>
+          </template>
         </note-header>
       </div>
       <div class="note-body">
         <div
-          :class="{
-            'system-note-commit-list': hasMoreCommits,
-            'hide-shade': expanded,
-          }"
+          :class="{ 'system-note-commit-list': hasMoreCommits, 'hide-shade': expanded }"
           class="note-text md"
           v-html="note.note_html"
         ></div>
@@ -106,6 +117,12 @@ export default {
             <span>{{ __('Toggle commit list') }}</span>
           </div>
         </div>
+        <div v-if="shouldShowDescriptionVersion" class="description-version pt-2">
+          <pre v-if="isLoadingDescriptionVersion" class="loading-state">
+            <gl-skeleton-loading />
+          </pre>
+          <pre v-else class="wrapper mt-2" v-html="descriptionVersion"></pre>
+        </div>
       </div>
     </div>
   </timeline-entry-item>
diff --git a/app/assets/stylesheets/framework/flash.scss b/app/assets/stylesheets/framework/flash.scss
index 657e7023111..d604d97d270 100644
--- a/app/assets/stylesheets/framework/flash.scss
+++ b/app/assets/stylesheets/framework/flash.scss
@@ -1,7 +1,7 @@
 $notification-box-shadow-color: rgba(0, 0, 0, 0.25);
 
 .flash-container {
-  margin-top: 10px;
+  margin: 0;
   margin-bottom: $gl-padding;
   font-size: 14px;
   position: relative;
@@ -41,6 +41,7 @@ $notification-box-shadow-color: rgba(0, 0, 0, 0.25);
   .flash-success,
   .flash-warning {
     padding: $gl-padding $gl-padding-32 $gl-padding ($gl-padding + $gl-padding-4);
+    margin-top: 10px;
 
     .container-fluid,
     .container-fluid.container-limited {
diff --git a/app/assets/stylesheets/pages/notes.scss b/app/assets/stylesheets/pages/notes.scss
index 21a9f143039..1da9f691639 100644
--- a/app/assets/stylesheets/pages/notes.scss
+++ b/app/assets/stylesheets/pages/notes.scss
@@ -310,6 +310,17 @@ $note-form-margin-left: 72px;
     .note-body {
       overflow: hidden;
 
+      .description-version {
+        pre {
+          max-height: $dropdown-max-height-lg;
+          white-space: pre-wrap;
+
+          &.loading-state {
+            height: 94px;
+          }
+        }
+      }
+
       .system-note-commit-list-toggler {
         color: $blue-600;
         padding: 10px 0 0;
diff --git a/app/finders/prometheus_metrics_finder.rb b/app/finders/prometheus_metrics_finder.rb
new file mode 100644
index 00000000000..84a071abbd5
--- /dev/null
+++ b/app/finders/prometheus_metrics_finder.rb
@@ -0,0 +1,129 @@
+# frozen_string_literal: true
+
+class PrometheusMetricsFinder
+  ACCEPTED_PARAMS = [
+    :project,
+    :group,
+    :title,
+    :y_label,
+    :identifier,
+    :id,
+    :common,
+    :ordered
+  ].freeze
+
+  # Cautiously preferring a memoized class method over a constant
+  # so that the DB connection is accessed after the class is loaded.
+  def self.indexes
+    @indexes ||= PrometheusMetric
+      .connection
+      .indexes(:prometheus_metrics)
+      .map { |index| index.columns.map(&:to_sym) }
+  end
+
+  def initialize(params = {})
+    @params = params.slice(*ACCEPTED_PARAMS)
+  end
+
+  # @return [PrometheusMetric, PrometheusMetric::ActiveRecord_Relation]
+  def execute
+    validate_params!
+
+    metrics = by_project(::PrometheusMetric.all)
+    metrics = by_group(metrics)
+    metrics = by_title(metrics)
+    metrics = by_y_label(metrics)
+    metrics = by_common(metrics)
+    metrics = by_ordered(metrics)
+    metrics = by_identifier(metrics)
+    metrics = by_id(metrics)
+
+    metrics
+  end
+
+  private
+
+  attr_reader :params
+
+  def by_project(metrics)
+    return metrics unless params[:project]
+
+    metrics.for_project(params[:project])
+  end
+
+  def by_group(metrics)
+    return metrics unless params[:group]
+
+    metrics.for_group(params[:group])
+  end
+
+  def by_title(metrics)
+    return metrics unless params[:title]
+
+    metrics.for_title(params[:title])
+  end
+
+  def by_y_label(metrics)
+    return metrics unless params[:y_label]
+
+    metrics.for_y_label(params[:y_label])
+  end
+
+  def by_common(metrics)
+    return metrics unless params[:common]
+
+    metrics.common
+  end
+
+  def by_ordered(metrics)
+    return metrics unless params[:ordered]
+
+    metrics.ordered
+  end
+
+  def by_identifier(metrics)
+    return metrics unless params[:identifier]
+
+    metrics.for_identifier(params[:identifier])
+  end
+
+  def by_id(metrics)
+    return metrics unless params[:id]
+
+    metrics.id_in(params[:id])
+  end
+
+  def validate_params!
+    validate_params_present!
+    validate_id_params!
+    validate_indexes!
+  end
+
+  # Ensure all provided params are supported
+  def validate_params_present!
+    raise ArgumentError, "Please provide one or more of: #{ACCEPTED_PARAMS}" if params.blank?
+  end
+
+  # Protect against the caller "finding" the wrong metric
+  def validate_id_params!
+    raise ArgumentError, 'Only one of :identifier, :id is permitted' if params[:identifier] && params[:id]
+    raise ArgumentError, ':identifier must be scoped to a :project or :common' if params[:identifier] && !(params[:project] || params[:common])
+  end
+
+  # Protect against unaccounted-for, complex/slow queries.
+  # This is not a hard and fast rule, but is meant to encourage
+  # mindful inclusion of new queries.
+  def validate_indexes!
+    indexable_params = params.except(:ordered, :id, :project).keys
+    indexable_params << :project_id if params[:project]
+    indexable_params.sort!
+
+    raise ArgumentError, "An index should exist for params: #{indexable_params}" unless appropriate_index?(indexable_params)
+  end
+
+  def appropriate_index?(indexable_params)
+    return true if indexable_params.blank?
+
+    self.class.indexes.any? { |index| (index - indexable_params).empty? }
+  end
+end
diff --git a/app/models/description_version.rb b/app/models/description_version.rb
index abab7f94212..05362a2f90b 100644
--- a/app/models/description_version.rb
+++ b/app/models/description_version.rb
@@ -10,6 +10,10 @@ class DescriptionVersion < ApplicationRecord
     %i(issue merge_request).freeze
   end
 
+  def issuable
+    issue || merge_request
+  end
+
   private
 
   def exactly_one_issuable
diff --git a/app/models/prometheus_metric.rb b/app/models/prometheus_metric.rb
index 08f4df7ea01..d0dc31476ff 100644
--- a/app/models/prometheus_metric.rb
+++ b/app/models/prometheus_metric.rb
@@ -14,7 +14,13 @@ class PrometheusMetric < ApplicationRecord
   validates :project, presence: true, unless: :common?
   validates :project, absence: true, if: :common?
 
+  scope :for_project, -> (project) { where(project: project) }
+  scope :for_group, -> (group) { where(group: group) }
+  scope :for_title, -> (title) { where(title: title) }
+  scope :for_y_label, -> (y_label) { where(y_label: y_label) }
+  scope :for_identifier, -> (identifier) { where(identifier: identifier) }
   scope :common, -> { where(common: true) }
+  scope :ordered, -> { reorder(created_at: :asc) }
 
   def priority
     group_details(group).fetch(:priority)
diff --git a/app/serializers/note_entity.rb b/app/serializers/note_entity.rb
index 1d3b59eb1b7..c49dec2a93c 100644
--- a/app/serializers/note_entity.rb
+++ b/app/serializers/note_entity.rb
@@ -79,3 +79,5 @@ class NoteEntity < API::Entities::Note
     request.current_user
   end
 end
+
+NoteEntity.prepend_if_ee('EE::NoteEntity')
diff --git a/app/services/metrics/dashboard/custom_metric_embed_service.rb b/app/services/metrics/dashboard/custom_metric_embed_service.rb
index dce713fbda7..79a556b1695 100644
--- a/app/services/metrics/dashboard/custom_metric_embed_service.rb
+++ b/app/services/metrics/dashboard/custom_metric_embed_service.rb
@@ -77,15 +77,14 @@ module Metrics
       # There may be multiple metrics, but they should be
       # displayed in a single panel/chart.
       # @return [ActiveRecord::AssociationRelation<PromtheusMetric>]
-      # rubocop: disable CodeReuse/ActiveRecord
       def metrics
-        project.prometheus_metrics.where(
+        PrometheusMetricsFinder.new(
+          project: project,
           group: group_key,
           title: title,
           y_label: y_label
-        )
+        ).execute
       end
-      # rubocop: enable CodeReuse/ActiveRecord
 
       # Returns a symbol representing the group that
       # the dashboard's group title belongs to.
diff --git a/app/views/admin/users/show.html.haml b/app/views/admin/users/show.html.haml
index 706fa033c51..cd07fee8e59 100644
--- a/app/views/admin/users/show.html.haml
+++ b/app/views/admin/users/show.html.haml
@@ -152,7 +152,7 @@
               - email = " (#{@user.unconfirmed_email})"
             %p This user has an unconfirmed email address#{email}. You may force a confirmation.
             %br
-            = link_to 'Confirm user', confirm_admin_user_path(@user), method: :put, class: "btn btn-info", data: { confirm: 'Are you sure?' }
+            = link_to 'Confirm user', confirm_admin_user_path(@user), method: :put, class: "btn btn-info", data: { confirm: 'Are you sure?', qa_selector: 'confirm_user_button' }
 
       = render_if_exists 'admin/users/user_detail_note'
 
diff --git a/app/views/shared/form_elements/_description.html.haml b/app/views/shared/form_elements/_description.html.haml
index be78fd0ccfb..9db6184ebca 100644
--- a/app/views/shared/form_elements/_description.html.haml
+++ b/app/views/shared/form_elements/_description.html.haml
@@ -2,6 +2,7 @@
 - model = local_assigns.fetch(:model)
 
 - form = local_assigns.fetch(:form)
+- placeholder = model.is_a?(MergeRequest) ? _('Describe the goal of the changes and what reviewers should be aware of.') : _('Write a comment or drag your files here…')
 - supports_quick_actions = model.new_record?
 
 - if supports_quick_actions
@@ -16,7 +17,7 @@
     = render layout: 'projects/md_preview', locals: { url: preview_url, referenced_users: true } do
       = render 'projects/zen', f: form, attr: :description,
                                classes: 'note-textarea qa-issuable-form-description rspec-issuable-form-description',
-                               placeholder: "Write a comment or drag your files here…",
+                               placeholder: placeholder,
                                supports_quick_actions: supports_quick_actions
       = render 'shared/notes/hints', supports_quick_actions: supports_quick_actions
       .clearfix
diff --git a/app/views/shared/members/_access_request_links.html.haml b/app/views/shared/members/_access_request_links.html.haml
index eac743b5206..b4b06640bd9 100644
--- a/app/views/shared/members/_access_request_links.html.haml
+++ b/app/views/shared/members/_access_request_links.html.haml
@@ -4,7 +4,7 @@
   - link_text = source.is_a?(Group) ? _('Leave group') : _('Leave project')
   = link_to link_text, polymorphic_path([:leave, source, :members]),
             method: :delete,
-            data: { confirm: leave_confirmation_message(source) },
+            data: { confirm: leave_confirmation_message(source), qa_selector: 'leave_group_link' },
             class: 'access-request-link js-leave-link'
 - elsif requester = source.requesters.find_by(user_id: current_user.id) # rubocop: disable CodeReuse/ActiveRecord
   = link_to _('Withdraw Access Request'), polymorphic_path([:leave, source, :members]),
diff --git a/changelogs/unreleased/13135-call-to-validate_query-in-custom-metrics-form-is-not-retried.yml b/changelogs/unreleased/13135-call-to-validate_query-in-custom-metrics-form-is-not-retried.yml
new file mode 100644
index 00000000000..2728d5213c1
--- /dev/null
+++ b/changelogs/unreleased/13135-call-to-validate_query-in-custom-metrics-form-is-not-retried.yml
@@ -0,0 +1,5 @@
+---
+title: Fix query validation in custom metrics form
+merge_request: 18769
+author:
+type: fixed
diff --git a/changelogs/unreleased/30616-improve-merge-request-description-placeholder.yml b/changelogs/unreleased/30616-improve-merge-request-description-placeholder.yml
new file mode 100644
index 00000000000..942450313be
--- /dev/null
+++ b/changelogs/unreleased/30616-improve-merge-request-description-placeholder.yml
@@ -0,0 +1,5 @@
+---
+title: Improve merge request description placeholder
+merge_request: 20032
+author: Jacopo Beschi @jacopo-beschi
+type: changed
diff --git a/changelogs/unreleased/35528-add-ui-event-tracking-for-container-registry.yml b/changelogs/unreleased/35528-add-ui-event-tracking-for-container-registry.yml
new file mode 100644
index 00000000000..9b1ae378fef
--- /dev/null
+++ b/changelogs/unreleased/35528-add-ui-event-tracking-for-container-registry.yml
@@ -0,0 +1,5 @@
+---
+title: Add event tracking to container registry
+merge_request: 19772
+author:
+type: changed
diff --git a/changelogs/unreleased/36262-monitor-cluster-health-charts-does-not-load.yml b/changelogs/unreleased/36262-monitor-cluster-health-charts-does-not-load.yml
new file mode 100644
index 00000000000..95817e6010e
--- /dev/null
+++ b/changelogs/unreleased/36262-monitor-cluster-health-charts-does-not-load.yml
@@ -0,0 +1,5 @@
+---
+title: Fix broken monitor cluster health dashboard
+merge_request: 20120
+author:
+type: fixed
diff --git a/changelogs/unreleased/36453-flashcontainer-causing-page-header-to-be-off-center.yml b/changelogs/unreleased/36453-flashcontainer-causing-page-header-to-be-off-center.yml
new file mode 100644
index 00000000000..12f44a5f661
--- /dev/null
+++ b/changelogs/unreleased/36453-flashcontainer-causing-page-header-to-be-off-center.yml
@@ -0,0 +1,5 @@
+---
+title: Move margin-top from flash container to flash
+merge_request: 20211
+author:
+type: other
diff --git a/changelogs/unreleased/remove_var_from_bootstrap_jquery_spec_js.yml b/changelogs/unreleased/remove_var_from_bootstrap_jquery_spec_js.yml
new file mode 100644
index 00000000000..940404031c9
--- /dev/null
+++ b/changelogs/unreleased/remove_var_from_bootstrap_jquery_spec_js.yml
@@ -0,0 +1,5 @@
+---
+title: Remove var from bootstrap_jquery_spec.js
+merge_request: 20089
+author: Lee Tickett
+type: other
diff --git a/changelogs/unreleased/remove_var_from_issue_js.yml b/changelogs/unreleased/remove_var_from_issue_js.yml
new file mode 100644
index 00000000000..ee5cf59fb56
--- /dev/null
+++ b/changelogs/unreleased/remove_var_from_issue_js.yml
@@ -0,0 +1,5 @@
+---
+title: Remove var from issue.js
+merge_request: 20098
+author: Lee Tickett
+type: other
diff --git a/changelogs/unreleased/remove_var_from_labels_select_js.yml b/changelogs/unreleased/remove_var_from_labels_select_js.yml
new file mode 100644
index 00000000000..7186fe4b2f8
--- /dev/null
+++ b/changelogs/unreleased/remove_var_from_labels_select_js.yml
@@ -0,0 +1,5 @@
+---
+title: Remove var from labels_select.js
+merge_request: 20153
+author: Lee Tickett
+type: other
diff --git a/changelogs/unreleased/remove_var_from_tree_js.yml b/changelogs/unreleased/remove_var_from_tree_js.yml
new file mode 100644
index 00000000000..9738a44c4c8
--- /dev/null
+++ b/changelogs/unreleased/remove_var_from_tree_js.yml
@@ -0,0 +1,5 @@
+---
+title: Remove var from tree.js
+merge_request: 20103
+author: Lee Tickett
+type: other
diff --git a/db/fixtures/development/02_users.rb b/db/fixtures/development/02_users.rb
new file mode 100644
index 00000000000..6e0b37d7258
--- /dev/null
+++ b/db/fixtures/development/02_users.rb
@@ -0,0 +1,77 @@
+# frozen_string_literal: true
+
+class Gitlab::Seeder::Users
+  include ActionView::Helpers::NumberHelper
+
+  RANDOM_USERS_COUNT = 20
+  MASS_USERS_COUNT = ENV['CI'] ? 10 : 1_000_000
+  MASS_INSERT_USERNAME_START = 'mass_insert_user_'
+
+  attr_reader :opts
+
+  def initialize(opts = {})
+    @opts = opts
+  end
+
+  def seed!
+    Sidekiq::Testing.inline! do
+      create_mass_users!
+      create_random_users!
+    end
+  end
+
+  private
+
+  def create_mass_users!
+    encrypted_password = Devise::Encryptor.digest(User, '12345678')
+
+    Gitlab::Seeder.with_mass_insert(MASS_USERS_COUNT, User) do
+      ActiveRecord::Base.connection.execute <<~SQL
+        INSERT INTO users (username, name, email, confirmed_at, projects_limit, encrypted_password)
+        SELECT
+          '#{MASS_INSERT_USERNAME_START}' || seq,
+          'Seed user ' || seq,
+          'seed_user' || seq || '@example.com',
+          to_timestamp(seq),
+          #{MASS_USERS_COUNT},
+          '#{encrypted_password}'
+        FROM generate_series(1, #{MASS_USERS_COUNT}) AS seq
+      SQL
+    end
+
+    relation = User.where(admin: false)
+    Gitlab::Seeder.with_mass_insert(relation.count, Namespace) do
+      ActiveRecord::Base.connection.execute <<~SQL
+        INSERT INTO namespaces (name, path, owner_id)
+        SELECT
+          username,
+          username,
+          id
+        FROM users WHERE NOT admin
+      SQL
+    end
+  end
+
+  def create_random_users!
+    RANDOM_USERS_COUNT.times do |i|
+      begin
+        User.create!(
+          username: FFaker::Internet.user_name,
+          name: FFaker::Name.name,
+          email: FFaker::Internet.email,
+          confirmed_at: DateTime.now,
+          password: '12345678'
+        )
+
+        print '.'
+      rescue ActiveRecord::RecordInvalid
+        print 'F'
+      end
+    end
+  end
+end
+
+Gitlab::Seeder.quiet do
+  users = Gitlab::Seeder::Users.new
+  users.seed!
+end
diff --git a/db/fixtures/development/03_project.rb b/db/fixtures/development/03_project.rb
index 46018cf68aa..87ef65276eb 100644
--- a/db/fixtures/development/03_project.rb
+++ b/db/fixtures/development/03_project.rb
@@ -1,137 +1,210 @@
 require './spec/support/sidekiq'
 
-# rubocop:disable Rails/Output
+class Gitlab::Seeder::Projects
+  include ActionView::Helpers::NumberHelper
 
-Sidekiq::Testing.inline! do
-  Gitlab::Seeder.quiet do
-    Gitlab::Seeder.without_gitaly_timeout do
-      project_urls = %w[
-        https://gitlab.com/gitlab-org/gitlab-test.git
-        https://gitlab.com/gitlab-org/gitlab-shell.git
-        https://gitlab.com/gnuwget/wget2.git
-        https://gitlab.com/Commit451/LabCoat.git
-        https://github.com/jashkenas/underscore.git
-        https://github.com/flightjs/flight.git
-        https://github.com/twitter/typeahead.js.git
-        https://github.com/h5bp/html5-boilerplate.git
-        https://github.com/google/material-design-lite.git
-        https://github.com/jlevy/the-art-of-command-line.git
-        https://github.com/FreeCodeCamp/freecodecamp.git
-        https://github.com/google/deepdream.git
-        https://github.com/jtleek/datasharing.git
-        https://github.com/WebAssembly/design.git
-        https://github.com/airbnb/javascript.git
-        https://github.com/tessalt/echo-chamber-js.git
-        https://github.com/atom/atom.git
-        https://github.com/mattermost/mattermost-server.git
-        https://github.com/purifycss/purifycss.git
-        https://github.com/facebook/nuclide.git
-        https://github.com/wbkd/awesome-d3.git
-        https://github.com/kilimchoi/engineering-blogs.git
-        https://github.com/gilbarbara/logos.git
-        https://github.com/reduxjs/redux.git
-        https://github.com/awslabs/s2n.git
-        https://github.com/arkency/reactjs_koans.git
-        https://github.com/twbs/bootstrap.git
-        https://github.com/chjj/ttystudio.git
-        https://github.com/MostlyAdequate/mostly-adequate-guide.git
-        https://github.com/octocat/Spoon-Knife.git
-        https://github.com/opencontainers/runc.git
-        https://github.com/googlesamples/android-topeka.git
-      ]
+  PROJECT_URLS = %w[
+    https://gitlab.com/gitlab-org/gitlab-test.git
+    https://gitlab.com/gitlab-org/gitlab-shell.git
+    https://gitlab.com/gnuwget/wget2.git
+    https://gitlab.com/Commit451/LabCoat.git
+    https://github.com/jashkenas/underscore.git
+    https://github.com/flightjs/flight.git
+    https://github.com/twitter/typeahead.js.git
+    https://github.com/h5bp/html5-boilerplate.git
+    https://github.com/google/material-design-lite.git
+    https://github.com/jlevy/the-art-of-command-line.git
+    https://github.com/FreeCodeCamp/freecodecamp.git
+    https://github.com/google/deepdream.git
+    https://github.com/jtleek/datasharing.git
+    https://github.com/WebAssembly/design.git
+    https://github.com/airbnb/javascript.git
+    https://github.com/tessalt/echo-chamber-js.git
+    https://github.com/atom/atom.git
+    https://github.com/mattermost/mattermost-server.git
+    https://github.com/purifycss/purifycss.git
+    https://github.com/facebook/nuclide.git
+    https://github.com/wbkd/awesome-d3.git
+    https://github.com/kilimchoi/engineering-blogs.git
+    https://github.com/gilbarbara/logos.git
+    https://github.com/reduxjs/redux.git
+    https://github.com/awslabs/s2n.git
+    https://github.com/arkency/reactjs_koans.git
+    https://github.com/twbs/bootstrap.git
+    https://github.com/chjj/ttystudio.git
+    https://github.com/MostlyAdequate/mostly-adequate-guide.git
+    https://github.com/octocat/Spoon-Knife.git
+    https://github.com/opencontainers/runc.git
+    https://github.com/googlesamples/android-topeka.git
+  ]
+  LARGE_PROJECT_URLS = %w[
+    https://github.com/torvalds/linux.git
+    https://gitlab.gnome.org/GNOME/gimp.git
+    https://gitlab.gnome.org/GNOME/gnome-mud.git
+    https://gitlab.com/fdroid/fdroidclient.git
+    https://gitlab.com/inkscape/inkscape.git
+    https://github.com/gnachman/iTerm2.git
+  ]
+  # Consider altering MASS_USERS_COUNT for less
+  # users with projects.
+  MASS_PROJECTS_COUNT_PER_USER = {
+    private: 3, # 3m projects +
+    internal: 1, # 1m projects +
+    public: 1 # 1m projects = 5m total
+  }
+  MASS_INSERT_NAME_START = 'mass_insert_project_'
 
-      large_project_urls = %w[
-        https://github.com/torvalds/linux.git
-        https://gitlab.gnome.org/GNOME/gimp.git
-        https://gitlab.gnome.org/GNOME/gnome-mud.git
-        https://gitlab.com/fdroid/fdroidclient.git
-        https://gitlab.com/inkscape/inkscape.git
-        https://github.com/gnachman/iTerm2.git
-      ]
+  def seed!
+    Sidekiq::Testing.inline! do
+      create_real_projects!
+      create_large_projects!
+      create_mass_projects!
+    end
+  end
 
-      def create_project(url, force_latest_storage: false)
-        group_path, project_path = url.split('/')[-2..-1]
+  private
 
-        group = Group.find_by(path: group_path)
+  def create_real_projects!
+    # You can specify how many projects you need during seed execution
+    size = ENV['SIZE'].present? ? ENV['SIZE'].to_i : 8
 
-        unless group
-          group = Group.new(
-            name: group_path.titleize,
-            path: group_path
-          )
-          group.description = FFaker::Lorem.sentence
-          group.save!
+    PROJECT_URLS.first(size).each_with_index do |url, i|
+      create_real_project!(url, force_latest_storage: i.even?)
+    end
+  end
 
-          group.add_owner(User.first)
-        end
+  def create_large_projects!
+    return unless ENV['LARGE_PROJECTS'].present?
 
-        project_path.gsub!(".git", "")
+    LARGE_PROJECT_URLS.each(&method(:create_real_project!))
 
-        params = {
-          import_url: url,
-          namespace_id: group.id,
-          name: project_path.titleize,
-          description: FFaker::Lorem.sentence,
-          visibility_level: Gitlab::VisibilityLevel.values.sample,
-          skip_disk_validation: true
-        }
+    if ENV['FORK'].present?
+      puts "\nGenerating forks"
 
-        if force_latest_storage
-          params[:storage_version] = Project::LATEST_STORAGE_VERSION
-        end
+      project_name = ENV['FORK'] == 'true' ? 'torvalds/linux' : ENV['FORK']
 
-        project = nil
+      project = Project.find_by_full_path(project_name)
 
-        Sidekiq::Worker.skipping_transaction_check do
-          project = Projects::CreateService.new(User.first, params).execute
+      User.offset(1).first(5).each do |user|
+        new_project = ::Projects::ForkService.new(project, user).execute
 
-          # Seed-Fu runs this entire fixture in a transaction, so the `after_commit`
-          # hook won't run until after the fixture is loaded. That is too late
-          # since the Sidekiq::Testing block has already exited. Force clearing
-          # the `after_commit` queue to ensure the job is run now.
-          project.send(:_run_after_commit_queue)
-          project.import_state.send(:_run_after_commit_queue)
-        end
-
-        if project.valid? && project.valid_repo?
+        if new_project.valid? && (new_project.valid_repo? || new_project.import_state.scheduled?)
           print '.'
         else
-          puts project.errors.full_messages
-          print 'F'
-        end
-      end
-
-      # You can specify how many projects you need during seed execution
-      size = ENV['SIZE'].present? ? ENV['SIZE'].to_i : 8
-
-      project_urls.first(size).each_with_index do |url, i|
-        create_project(url, force_latest_storage: i.even?)
-      end
-
-      if ENV['LARGE_PROJECTS'].present?
-        large_project_urls.each(&method(:create_project))
-
-        if ENV['FORK'].present?
-          puts "\nGenerating forks"
-
-          project_name = ENV['FORK'] == 'true' ? 'torvalds/linux' : ENV['FORK']
-
-          project = Project.find_by_full_path(project_name)
-
-          User.offset(1).first(5).each do |user|
-            new_project = Projects::ForkService.new(project, user).execute
-
-            if new_project.valid? && (new_project.valid_repo? || new_project.import_state.scheduled?)
-              print '.'
-            else
-              new_project.errors.full_messages.each do |error|
-                puts "#{new_project.full_path}: #{error}"
-              end
-              print 'F'
-            end
+          new_project.errors.full_messages.each do |error|
+            puts "#{new_project.full_path}: #{error}"
           end
+          print 'F'
         end
       end
     end
   end
+
+  def create_real_project!(url, force_latest_storage: false)
+    group_path, project_path = url.split('/')[-2..-1]
+
+    group = Group.find_by(path: group_path)
+
+    unless group
+      group = Group.new(
+        name: group_path.titleize,
+        path: group_path
+      )
+      group.description = FFaker::Lorem.sentence
+      group.save!
+
+      group.add_owner(User.first)
+    end
+
+    project_path.gsub!(".git", "")
+
+    params = {
+      import_url: url,
+      namespace_id: group.id,
+      name: project_path.titleize,
+      description: FFaker::Lorem.sentence,
+      visibility_level: Gitlab::VisibilityLevel.values.sample,
+      skip_disk_validation: true
+    }
+
+    if force_latest_storage
+      params[:storage_version] = Project::LATEST_STORAGE_VERSION
+    end
+
+    project = nil
+
+    Sidekiq::Worker.skipping_transaction_check do
+      project = ::Projects::CreateService.new(User.first, params).execute
+
+      # Seed-Fu runs this entire fixture in a transaction, so the `after_commit`
+      # hook won't run until after the fixture is loaded. That is too late
+      # since the Sidekiq::Testing block has already exited. Force clearing
+      # the `after_commit` queue to ensure the job is run now.
+      project.send(:_run_after_commit_queue)
+      project.import_state.send(:_run_after_commit_queue)
+    end
+
+    if project.valid? && project.valid_repo?
+      print '.'
+    else
+      puts project.errors.full_messages
+      print 'F'
+    end
+  end
+
+  def create_mass_projects!
+    projects_per_user_count   = MASS_PROJECTS_COUNT_PER_USER.values.sum
+    visibility_per_user       = ['private'] * MASS_PROJECTS_COUNT_PER_USER.fetch(:private) +
+                                ['internal'] * MASS_PROJECTS_COUNT_PER_USER.fetch(:internal) +
+                                ['public'] * MASS_PROJECTS_COUNT_PER_USER.fetch(:public)
+    visibility_level_per_user = visibility_per_user.map { |visibility| Gitlab::VisibilityLevel.level_value(visibility) }
+
+    visibility_per_user       = visibility_per_user.join(',')
+    visibility_level_per_user = visibility_level_per_user.join(',')
+
+    Gitlab::Seeder.with_mass_insert(User.count * projects_per_user_count, "Projects and relations") do
+      ActiveRecord::Base.connection.execute <<~SQL
+        INSERT INTO projects (name, path, creator_id, namespace_id, visibility_level, created_at, updated_at)
+        SELECT
+          'Seed project ' || seq || ' ' || ('{#{visibility_per_user}}'::text[])[seq] AS project_name,
+          'mass_insert_project_' || ('{#{visibility_per_user}}'::text[])[seq] || '_' || seq AS project_path,
+          u.id AS user_id,
+          n.id AS namespace_id,
+          ('{#{visibility_level_per_user}}'::int[])[seq] AS visibility_level,
+          NOW() AS created_at,
+          NOW() AS updated_at
+        FROM users u
+          CROSS JOIN generate_series(1, #{projects_per_user_count}) AS seq
+          JOIN namespaces n ON n.owner_id=u.id
+      SQL
+
+      ActiveRecord::Base.connection.execute <<~SQL
+        INSERT INTO project_features (project_id, merge_requests_access_level, issues_access_level, wiki_access_level,
+                                      pages_access_level)
+        SELECT
+          id,
+          #{ProjectFeature::ENABLED} AS merge_requests_access_level,
+          #{ProjectFeature::ENABLED} AS issues_access_level,
+          #{ProjectFeature::ENABLED} AS wiki_access_level,
+          #{ProjectFeature::ENABLED} AS pages_access_level
+        FROM projects ON CONFLICT (project_id) DO NOTHING;
+      SQL
+
+      ActiveRecord::Base.connection.execute <<~SQL
+        INSERT INTO routes (source_id, source_type, name, path)
+        SELECT
+          p.id,
+          'Project',
+          u.name || ' / ' || p.name,
+          u.username || '/' || p.path
+        FROM projects p JOIN users u ON u.id=p.creator_id
+        ON CONFLICT (source_type, source_id) DO NOTHING;
+      SQL
+    end
+  end
+end
+
+Gitlab::Seeder.quiet do
+  projects = Gitlab::Seeder::Projects.new
+  projects.seed!
 end
diff --git a/db/fixtures/development/04_labels.rb b/db/fixtures/development/04_labels.rb
index b9ae4098d76..21d552c89f5 100644
--- a/db/fixtures/development/04_labels.rb
+++ b/db/fixtures/development/04_labels.rb
@@ -43,7 +43,7 @@ Gitlab::Seeder.quiet do
   end
 
   puts "\nGenerating project labels"
-  Project.all.find_each do |project|
+  Project.not_mass_generated.find_each do |project|
     Gitlab::Seeder::ProjectLabels.new(project).seed!
   end
 end
diff --git a/db/fixtures/development/05_users.rb b/db/fixtures/development/05_users.rb
deleted file mode 100644
index 101ff3a1209..00000000000
--- a/db/fixtures/development/05_users.rb
+++ /dev/null
@@ -1,34 +0,0 @@
-require './spec/support/sidekiq'
-
-Gitlab::Seeder.quiet do
-  20.times do |i|
-    begin
-      User.create!(
-        username: FFaker::Internet.user_name,
-        name: FFaker::Name.name,
-        email: FFaker::Internet.email,
-        confirmed_at: DateTime.now,
-        password: '12345678'
-      )
-
-      print '.'
-    rescue ActiveRecord::RecordInvalid
-      print 'F'
-    end
-  end
-
-  5.times do |i|
-    begin
-      User.create!(
-        username: "user#{i}",
-        name: "User #{i}",
-        email: "user#{i}@example.com",
-        confirmed_at: DateTime.now,
-        password: '12345678'
-      )
-      print '.'
-    rescue ActiveRecord::RecordInvalid
-      print 'F'
-    end
-  end
-end
diff --git a/db/fixtures/development/06_teams.rb b/db/fixtures/development/06_teams.rb
index b218f4e71fd..79ea96bf30e 100644
--- a/db/fixtures/development/06_teams.rb
+++ b/db/fixtures/development/06_teams.rb
@@ -3,7 +3,7 @@ require './spec/support/sidekiq'
 Sidekiq::Testing.inline! do
   Gitlab::Seeder.quiet do
     Group.all.each do |group|
-      User.all.sample(4).each do |user|
+      User.not_mass_generated.sample(4).each do |user|
         if group.add_user(user, Gitlab::Access.values.sample).persisted?
           print '.'
         else
@@ -12,8 +12,8 @@ Sidekiq::Testing.inline! do
       end
     end
 
-    Project.all.each do |project|
-      User.all.sample(4).each do |user|
+    Project.not_mass_generated.each do |project|
+      User.not_mass_generated.sample(4).each do |user|
         if project.add_role(user, Gitlab::Access.sym_options.keys.sample)
           print '.'
         else
diff --git a/db/fixtures/development/07_milestones.rb b/db/fixtures/development/07_milestones.rb
index 271bfbc97e0..1194bb3fe6f 100644
--- a/db/fixtures/development/07_milestones.rb
+++ b/db/fixtures/development/07_milestones.rb
@@ -1,7 +1,7 @@
 require './spec/support/sidekiq'
 
 Gitlab::Seeder.quiet do
-  Project.all.each do |project|
+  Project.not_mass_generated.each do |project|
     5.times do |i|
       milestone_params = {
         title: "v#{i}.0",
diff --git a/db/fixtures/development/10_merge_requests.rb b/db/fixtures/development/10_merge_requests.rb
index 4af545614f7..29f2fabbd5f 100644
--- a/db/fixtures/development/10_merge_requests.rb
+++ b/db/fixtures/development/10_merge_requests.rb
@@ -4,7 +4,13 @@ Gitlab::Seeder.quiet do
   # Limit the number of merge requests per project to avoid long seeds
   MAX_NUM_MERGE_REQUESTS = 10
 
-  Project.non_archived.with_merge_requests_enabled.reject(&:empty_repo?).each do |project|
+  projects = Project
+    .non_archived
+    .with_merge_requests_enabled
+    .not_mass_generated
+    .reject(&:empty_repo?)
+
+  projects.each do |project|
     branches = project.repository.branch_names.sample(MAX_NUM_MERGE_REQUESTS * 2)
 
     branches.each do |branch_name|
diff --git a/db/fixtures/development/11_keys.rb b/db/fixtures/development/11_keys.rb
index c405ecfdaf3..13eadc35e07 100644
--- a/db/fixtures/development/11_keys.rb
+++ b/db/fixtures/development/11_keys.rb
@@ -9,7 +9,7 @@ Sidekiq::Testing.disable! do
     # that it falls under `Sidekiq::Testing.disable!`.
     Key.skip_callback(:commit, :after, :add_to_shell)
 
-    User.first(10).each do |user|
+    User.not_mass_generated.first(10).each do |user|
       key = "ssh-rsa AAAAB3NzaC1yc2EAAAABJQAAAIEAiPWx6WM4lhHNedGfBpPJNPpZ7yKu+dnn1SJejgt#{user.id + 100}6k6YjzGGphH2TUxwKzxcKDKKezwkpfnxPkSMkuEspGRt/aZZ9wa++Oi7Qkr8prgHc4soW6NUlfDzpvZK2H5E7eQaSeP3SAwGmQKUFHCddNaP0L+hM7zhFNzjFvpaMgJw0="
 
       key = user.keys.create(
diff --git a/db/fixtures/development/12_snippets.rb b/db/fixtures/development/12_snippets.rb
index a9f4069a0f8..0ee9058a20b 100644
--- a/db/fixtures/development/12_snippets.rb
+++ b/db/fixtures/development/12_snippets.rb
@@ -25,7 +25,7 @@ end
 eos
 
   50.times do |i|
-    user = User.all.sample
+    user = User.not_mass_generated.sample
 
     PersonalSnippet.seed(:id, [{
       id: i,
diff --git a/db/fixtures/development/14_pipelines.rb b/db/fixtures/development/14_pipelines.rb
index 5c8b681fa92..468caac23f9 100644
--- a/db/fixtures/development/14_pipelines.rb
+++ b/db/fixtures/development/14_pipelines.rb
@@ -214,7 +214,7 @@ class Gitlab::Seeder::Pipelines
 end
 
 Gitlab::Seeder.quiet do
-  Project.all.sample(5).each do |project|
+  Project.not_mass_generated.sample(5).each do |project|
     project_builds = Gitlab::Seeder::Pipelines.new(project)
     project_builds.seed!
   end
diff --git a/db/fixtures/development/16_protected_branches.rb b/db/fixtures/development/16_protected_branches.rb
index 39d466fb43f..2b492ac1f61 100644
--- a/db/fixtures/development/16_protected_branches.rb
+++ b/db/fixtures/development/16_protected_branches.rb
@@ -3,7 +3,7 @@ require './spec/support/sidekiq'
 Gitlab::Seeder.quiet do
   admin_user = User.find(1)
 
-  Project.all.each do |project|
+  Project.not_mass_generated.each do |project|
     params = {
       name: 'master'
     }
diff --git a/db/fixtures/development/17_cycle_analytics.rb b/db/fixtures/development/17_cycle_analytics.rb
index b7ddeef95b8..606a4cb1dde 100644
--- a/db/fixtures/development/17_cycle_analytics.rb
+++ b/db/fixtures/development/17_cycle_analytics.rb
@@ -217,7 +217,7 @@ Gitlab::Seeder.quiet do
   flag = 'SEED_CYCLE_ANALYTICS'
 
   if ENV[flag]
-    Project.find_each do |project|
+    Project.not_mass_generated.find_each do |project|
       # This seed naively assumes that every project has a repository, and every
       # repository has a `master` branch, which may be the case for a pristine
       # GDK seed, but is almost never true for a GDK that's actually had
diff --git a/db/fixtures/development/19_environments.rb b/db/fixtures/development/19_environments.rb
index 3e227928a29..08363804216 100644
--- a/db/fixtures/development/19_environments.rb
+++ b/db/fixtures/development/19_environments.rb
@@ -67,7 +67,7 @@ class Gitlab::Seeder::Environments
 end
 
 Gitlab::Seeder.quiet do
-  Project.all.sample(5).each do |project|
+  Project.not_mass_generated.sample(5).each do |project|
     project_environments = Gitlab::Seeder::Environments.new(project)
     project_environments.seed!
   end
diff --git a/db/fixtures/development/23_spam_logs.rb b/db/fixtures/development/23_spam_logs.rb
index 81cc13e6b2d..4a839f5bc23 100644
--- a/db/fixtures/development/23_spam_logs.rb
+++ b/db/fixtures/development/23_spam_logs.rb
@@ -22,7 +22,7 @@ module Db
         end
 
         def self.random_user
-          User.find(User.pluck(:id).sample)
+          User.find(User.not_mass_generated.pluck(:id).sample)
         end
       end
     end
diff --git a/db/fixtures/development/24_forks.rb b/db/fixtures/development/24_forks.rb
index 971c6f0d0c8..fa16b2a1d93 100644
--- a/db/fixtures/development/24_forks.rb
+++ b/db/fixtures/development/24_forks.rb
@@ -2,8 +2,8 @@ require './spec/support/sidekiq'
 
 Sidekiq::Testing.inline! do
   Gitlab::Seeder.quiet do
-    User.all.sample(10).each do |user|
-      source_project = Project.public_only.sample
+    User.not_mass_generated.sample(10).each do |user|
+      source_project = Project.not_mass_generated.public_only.sample
 
       ##
       # 03_project.rb might not have created a public project because
diff --git a/doc/administration/packages/container_registry.md b/doc/administration/packages/container_registry.md
index 2444365d5ae..a62e3ab603d 100644
--- a/doc/administration/packages/container_registry.md
+++ b/doc/administration/packages/container_registry.md
@@ -18,7 +18,9 @@ You can read more about the Docker Registry at
 
 **Omnibus GitLab installations**
 
-All you have to do is configure the domain name under which the Container
+If you are using the Omnibus GitLab built in [Let's Encrypt integration](https://docs.gitlab.com/omnibus/settings/ssl.html#lets-encrypt-integration), as of GitLab 12.5, the Container Registry will be automatically enabled on port 5050 of the default domain.
+
+If you would like to use a separate domain, all you have to do is configure the domain name under which the Container
 Registry will listen to. Read
 [#container-registry-domain-configuration](#container-registry-domain-configuration)
 and pick one of the two options that fits your case.
diff --git a/doc/api/graphql/reference/gitlab_schema.graphql b/doc/api/graphql/reference/gitlab_schema.graphql
index 1eb010b1ad6..ecb7f04318a 100644
--- a/doc/api/graphql/reference/gitlab_schema.graphql
+++ b/doc/api/graphql/reference/gitlab_schema.graphql
@@ -1219,6 +1219,10 @@ type Epic implements Noteable {
   hasIssues: Boolean!
   id: ID!
   iid: ID!
+
+  """
+  A list of issues associated with the epic
+  """
   issues(
     """
     Returns the elements in the list that come after the specified cursor.
diff --git a/doc/api/graphql/reference/gitlab_schema.json b/doc/api/graphql/reference/gitlab_schema.json
index 5e6a9dba4ed..b8d788fb6ec 100644
--- a/doc/api/graphql/reference/gitlab_schema.json
+++ b/doc/api/graphql/reference/gitlab_schema.json
@@ -3751,7 +3751,7 @@
             },
             {
               "name": "issues",
-              "description": null,
+              "description": "A list of issues associated with the epic",
               "args": [
                 {
                   "name": "after",
diff --git a/doc/development/database_debugging.md b/doc/development/database_debugging.md
index 9947f9c16c0..65a3e518585 100644
--- a/doc/development/database_debugging.md
+++ b/doc/development/database_debugging.md
@@ -19,7 +19,7 @@ If you just want to delete everything and start over with an empty DB (~1 minute
 
 - `bundle exec rake db:reset RAILS_ENV=development`
 
-If you just want to delete everything and start over with dummy data (~40 minutes). This also does `db:reset` and runs DB-specific migrations:
+If you just want to delete everything and start over with dummy data (~4 minutes). This also does `db:reset` and runs DB-specific migrations:
 
 - `bundle exec rake dev:setup RAILS_ENV=development`
 
diff --git a/doc/development/rake_tasks.md b/doc/development/rake_tasks.md
index 229efc164c3..369806d462b 100644
--- a/doc/development/rake_tasks.md
+++ b/doc/development/rake_tasks.md
@@ -12,6 +12,14 @@ The `setup` task is an alias for `gitlab:setup`.
 This tasks calls `db:reset` to create the database, and calls `db:seed_fu` to seed the database.
 Note: `db:setup` calls `db:seed` but this does nothing.
 
+### Env variables
+
+**MASS_INSERT**: Create millions of users (2m), projects (5m) and its
+relations. It's highly recommended to run the seed with it to catch slow queries
+while developing. Expect the process to take up to 20 extra minutes.
+
+**LARGE_PROJECTS**: Create large projects (through import) from a predefined set of urls.
+
 ### Seeding issues for all or a given project
 
 You can seed issues for all or a given project with the `gitlab:seed:issues`
diff --git a/doc/user/application_security/dependency_scanning/index.md b/doc/user/application_security/dependency_scanning/index.md
index bd20cc9145d..0e46052b0bd 100644
--- a/doc/user/application_security/dependency_scanning/index.md
+++ b/doc/user/application_security/dependency_scanning/index.md
@@ -37,7 +37,7 @@ The results are sorted by the severity of the vulnerability:
 
 ## Requirements
 
-To run a Dependency Scanning job, you need GitLab Runner with the
+To run a Dependency Scanning job, by default, you need GitLab Runner with the
 [`docker`](https://docs.gitlab.com/runner/executors/docker.html#use-docker-in-docker-with-privileged-mode) or
 [`kubernetes`](https://docs.gitlab.com/runner/install/kubernetes.html#running-privileged-containers-for-the-runners)
 executor running in privileged mode. If you're using the shared Runners on GitLab.com,
@@ -47,6 +47,8 @@ CAUTION: **Caution:**
 If you use your own Runners, make sure that the Docker version you have installed
 is **not** `19.03.00`. See [troubleshooting information](#error-response-from-daemon-error-processing-tar-file-docker-tar-relocation-error) for details.
 
+Privileged mode is not necessary if you've [disabled Docker in Docker for Dependency Scanning](#disabling-docker-in-docker-for-dependency-scanning)
+
 ## Supported languages and package managers
 
 The following languages and dependency managers are supported.
@@ -133,6 +135,7 @@ using environment variables.
 | `DS_PYTHON_VERSION`                     | Version of Python. If set to 2, dependencies are installed using Python 2.7 instead of Python 3.6. ([Introduced](https://gitlab.com/gitlab-org/gitlab/issues/12296) in GitLab 12.1)| |
 | `DS_PIP_DEPENDENCY_PATH`                | Path to load Python pip dependencies from. ([Introduced](https://gitlab.com/gitlab-org/gitlab/issues/12412) in GitLab 12.2) | |
 | `DS_DEFAULT_ANALYZERS`                  | Override the names of the official default images. Read more about [customizing analyzers](analyzers.md). | |
+| `DS_DISABLE_DIND`                       | Disable Docker in Docker and run analyzers [individually](#disabling-docker-in-docker-for-dependency-scanning).| |
 | `DS_PULL_ANALYZER_IMAGES`               | Pull the images from the Docker registry (set to `0` to disable). | |
 | `DS_EXCLUDED_PATHS`                     | Exclude vulnerabilities from output based on the paths. A comma-separated list of patterns. Patterns can be globs, file or folder paths. Parent directories will also match patterns. | `DS_EXCLUDED_PATHS=doc,spec` |
 | `DS_DOCKER_CLIENT_NEGOTIATION_TIMEOUT`  | Time limit for Docker client negotiation. Timeouts are parsed using Go's [`ParseDuration`](https://golang.org/pkg/time/#ParseDuration). Valid time units are `ns`, `us` (or `µs`), `ms`, `s`, `m`, `h`. For example, `300ms`, `1.5h`, or `2h45m`. | |
@@ -168,6 +171,23 @@ so that you don't have to expose your private data in `.gitlab-ci.yml` (e.g., ad
 </settings>
 ```
 
+### Disabling Docker in Docker for Dependency Scanning
+
+> [Introduced](https://gitlab.com/gitlab-org/gitlab/issues/12487) in GitLab Ultimate 12.5.
+
+You can avoid the need for Docker in Docker by running the individual analyzers.
+This does not require running the executor in privileged mode. For example:
+
+```yaml
+include:
+  template: Dependency-Scanning.gitlab-ci.yml
+
+variables:
+  DS_DISABLE_DIND: "true"
+```
+
+This will create individual `<analyzer-name>-dependency_scanning` jobs for each analyzer that runs in your CI/CD pipeline.
+
 ## Interacting with the vulnerabilities
 
 Once a vulnerability is found, you can interact with it. Read more on how to
diff --git a/lib/gitlab/graphql/authorize/instrumentation.rb b/lib/gitlab/graphql/authorize/instrumentation.rb
index 15ecc3b04f0..f9ff2b30eae 100644
--- a/lib/gitlab/graphql/authorize/instrumentation.rb
+++ b/lib/gitlab/graphql/authorize/instrumentation.rb
@@ -9,12 +9,16 @@ module Gitlab
         def instrument(_type, field)
           service = AuthorizeFieldService.new(field)
 
-          if service.authorizations?
+          if service.authorizations? && !resolver_skips_authorizations?(field)
             field.redefine { resolve(service.authorized_resolve) }
           else
             field
           end
         end
+
+        def resolver_skips_authorizations?(field)
+          field.metadata[:resolver].try(:skip_authorizations?)
+        end
       end
     end
   end
diff --git a/lib/gitlab/graphql/connections.rb b/lib/gitlab/graphql/connections.rb
index 64f7a268b7e..38c7d98f37c 100644
--- a/lib/gitlab/graphql/connections.rb
+++ b/lib/gitlab/graphql/connections.rb
@@ -8,6 +8,10 @@ module Gitlab
           ActiveRecord::Relation,
           Gitlab::Graphql::Connections::Keyset::Connection
         )
+        GraphQL::Relay::BaseConnection.register_connection_implementation(
+          Gitlab::Graphql::FilterableArray,
+          Gitlab::Graphql::Connections::FilterableArrayConnection
+        )
       end
     end
   end
diff --git a/lib/gitlab/graphql/connections/filterable_array_connection.rb b/lib/gitlab/graphql/connections/filterable_array_connection.rb
new file mode 100644
index 00000000000..800f2c949c6
--- /dev/null
+++ b/lib/gitlab/graphql/connections/filterable_array_connection.rb
@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Graphql
+    module Connections
+      # FilterableArrayConnection is useful especially for lazy-loaded values.
+      # It allows us to call a callback only on the slice of array being
+      # rendered in the "after loaded" phase.  For example we can check
+      # permissions only on a small subset of items.
+      class FilterableArrayConnection < GraphQL::Relay::ArrayConnection
+        def paged_nodes
+          @filtered_nodes ||= nodes.filter_callback.call(super)
+        end
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/graphql/filterable_array.rb b/lib/gitlab/graphql/filterable_array.rb
new file mode 100644
index 00000000000..4909d291fd6
--- /dev/null
+++ b/lib/gitlab/graphql/filterable_array.rb
@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Graphql
+    class FilterableArray < Array
+      attr_reader :filter_callback
+
+      def initialize(filter_callback, *args)
+        super(args)
+        @filter_callback = filter_callback
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/metrics/dashboard/stages/common_metrics_inserter.rb b/lib/gitlab/metrics/dashboard/stages/common_metrics_inserter.rb
index 188912bedb4..62479ed6de4 100644
--- a/lib/gitlab/metrics/dashboard/stages/common_metrics_inserter.rb
+++ b/lib/gitlab/metrics/dashboard/stages/common_metrics_inserter.rb
@@ -9,7 +9,7 @@ module Gitlab
           # find a corresponding database record. If found,
           # includes the record's id in the dashboard config.
           def transform!
-            common_metrics = ::PrometheusMetric.common
+            common_metrics = ::PrometheusMetricsFinder.new(common: true).execute
 
             for_metrics do |metric|
               metric_record = common_metrics.find { |m| m.identifier == metric[:id] }
diff --git a/lib/gitlab/metrics/dashboard/stages/project_metrics_inserter.rb b/lib/gitlab/metrics/dashboard/stages/project_metrics_inserter.rb
index 643be309992..c0f67d445f8 100644
--- a/lib/gitlab/metrics/dashboard/stages/project_metrics_inserter.rb
+++ b/lib/gitlab/metrics/dashboard/stages/project_metrics_inserter.rb
@@ -9,7 +9,7 @@ module Gitlab
           # config. If there are no project-specific metrics,
           # this will have no effect.
           def transform!
-            project.prometheus_metrics.each do |project_metric|
+            PrometheusMetricsFinder.new(project: project).execute.each do |project_metric|
               group = find_or_create_panel_group(dashboard[:panel_groups], project_metric)
               panel = find_or_create_panel(group[:panels], project_metric)
               find_or_create_metric(panel[:metrics], project_metric)
diff --git a/lib/gitlab/prometheus/metric_group.rb b/lib/gitlab/prometheus/metric_group.rb
index caf0d453b6f..1b6f7282eb3 100644
--- a/lib/gitlab/prometheus/metric_group.rb
+++ b/lib/gitlab/prometheus/metric_group.rb
@@ -11,13 +11,15 @@ module Gitlab
       validates :name, :priority, :metrics, presence: true
 
       def self.common_metrics
-        all_groups = ::PrometheusMetric.common.group_by(&:group_title).map do |name, metrics|
-          MetricGroup.new(
-            name: name,
-            priority: metrics.map(&:priority).max,
-            metrics: metrics.map(&:to_query_metric)
-          )
-        end
+        all_groups = ::PrometheusMetricsFinder.new(common: true).execute
+          .group_by(&:group_title)
+          .map do |name, metrics|
+            MetricGroup.new(
+              name: name,
+              priority: metrics.map(&:priority).max,
+              metrics: metrics.map(&:to_query_metric)
+            )
+          end
 
         all_groups.sort_by(&:priority).reverse
       end
diff --git a/lib/gitlab/prometheus/queries/knative_invocation_query.rb b/lib/gitlab/prometheus/queries/knative_invocation_query.rb
index 2691abe46d6..8873608c411 100644
--- a/lib/gitlab/prometheus/queries/knative_invocation_query.rb
+++ b/lib/gitlab/prometheus/queries/knative_invocation_query.rb
@@ -7,11 +7,14 @@ module Gitlab
         include QueryAdditionalMetrics
 
         def query(serverless_function_id)
-          PrometheusMetric
-            .find_by_identifier(:system_metrics_knative_function_invocation_count)
-            .to_query_metric.tap do |q|
-            q.queries[0][:result] = run_query(q.queries[0][:query_range], context(serverless_function_id))
-          end
+          PrometheusMetricsFinder
+            .new(identifier: :system_metrics_knative_function_invocation_count, common: true)
+            .execute
+            .first
+            .to_query_metric
+            .tap do |q|
+              q.queries[0][:result] = run_query(q.queries[0][:query_range], context(serverless_function_id))
+            end
         end
 
         protected
diff --git a/lib/gitlab/seeder.rb b/lib/gitlab/seeder.rb
index 8e2f16271eb..f96346322db 100644
--- a/lib/gitlab/seeder.rb
+++ b/lib/gitlab/seeder.rb
@@ -14,7 +14,71 @@ end
 
 module Gitlab
   class Seeder
+    extend ActionView::Helpers::NumberHelper
+
+    ESTIMATED_INSERT_PER_MINUTE = 2_000_000
+    MASS_INSERT_ENV = 'MASS_INSERT'
+
+    module ProjectSeed
+      extend ActiveSupport::Concern
+
+      included do
+        scope :not_mass_generated, -> do
+          where.not("path LIKE '#{Gitlab::Seeder::Projects::MASS_INSERT_NAME_START}%'")
+        end
+      end
+    end
+
+    module UserSeed
+      extend ActiveSupport::Concern
+
+      included do
+        scope :not_mass_generated, -> do
+          where.not("username LIKE '#{Gitlab::Seeder::Users::MASS_INSERT_USERNAME_START}%'")
+        end
+      end
+    end
+
+    def self.with_mass_insert(size, model)
+      humanized_model_name = model.is_a?(String) ? model : model.model_name.human.pluralize(size)
+
+      if !ENV[MASS_INSERT_ENV] && !ENV['CI']
+        puts "\nSkipping mass insertion for #{humanized_model_name}."
+        puts "Consider running the seed with #{MASS_INSERT_ENV}=1"
+        return
+      end
+
+      humanized_size = number_with_delimiter(size)
+      estimative = estimated_time_message(size)
+
+      puts "\nCreating #{humanized_size} #{humanized_model_name}."
+      puts estimative
+
+      yield
+
+      puts "\n#{number_with_delimiter(size)} #{humanized_model_name} created!"
+    end
+
+    def self.estimated_time_message(size)
+      estimated_minutes = (size.to_f / ESTIMATED_INSERT_PER_MINUTE).round
+      humanized_minutes = 'minute'.pluralize(estimated_minutes)
+
+      if estimated_minutes.zero?
+        "Rough estimated time: less than a minute ⏰"
+      else
+        "Rough estimated time: #{estimated_minutes} #{humanized_minutes} ⏰"
+      end
+    end
+
     def self.quiet
+      # Disable database insertion logs so speed isn't limited by ability to print to console
+      old_logger = ActiveRecord::Base.logger
+      ActiveRecord::Base.logger = nil
+
+      # Additional seed logic for models.
+      Project.include(ProjectSeed)
+      User.include(UserSeed)
+
       mute_notifications
       mute_mailer
 
@@ -23,6 +87,7 @@ module Gitlab
       yield
 
       SeedFu.quiet = false
+      ActiveRecord::Base.logger = old_logger
       puts "\nOK".color(:green)
     end
 
diff --git a/lib/tasks/dev.rake b/lib/tasks/dev.rake
index b1db4dc94a6..0488f26318a 100644
--- a/lib/tasks/dev.rake
+++ b/lib/tasks/dev.rake
@@ -5,6 +5,10 @@ namespace :dev do
   task setup: :environment do
     ENV['force'] = 'yes'
     Rake::Task["gitlab:setup"].invoke
+
+    # Make sure DB statistics are up to date.
+    ActiveRecord::Base.connection.execute('ANALYZE')
+
     Rake::Task["gitlab:shell:setup"].invoke
   end
 
diff --git a/lib/tasks/gitlab/seed.rake b/lib/tasks/gitlab/seed.rake
index d76e38b73b5..d758280ba69 100644
--- a/lib/tasks/gitlab/seed.rake
+++ b/lib/tasks/gitlab/seed.rake
@@ -22,7 +22,7 @@ namespace :gitlab do
 
           [project]
         else
-          Project.find_each
+          Project.not_mass_generated.find_each
         end
 
       projects.each do |project|
diff --git a/locale/gitlab.pot b/locale/gitlab.pot
index d1d10376352..e98f06864ce 100644
--- a/locale/gitlab.pot
+++ b/locale/gitlab.pot
@@ -4386,6 +4386,9 @@ msgstr ""
 msgid "Compare changes with the merge request target branch"
 msgstr ""
 
+msgid "Compare with previous version"
+msgstr ""
+
 msgid "CompareBranches|%{source_branch} and %{target_branch} are the same."
 msgstr ""
 
@@ -5683,6 +5686,9 @@ msgstr ""
 msgid "Descending"
 msgstr ""
 
+msgid "Describe the goal of the changes and what reviewers should be aware of."
+msgstr ""
+
 msgid "Description"
 msgstr ""
 
@@ -10711,9 +10717,6 @@ msgstr ""
 msgid "MergeRequests|started a thread on commit %{linkStart}%{commitDisplay}%{linkEnd}"
 msgstr ""
 
-msgid "MergeRequest| %{paragraphStart}changed the description %{descriptionChangedTimes} times %{timeDifferenceMinutes}%{paragraphEnd}"
-msgstr ""
-
 msgid "MergeRequest|Error dismissing suggestion popover. Please try again."
 msgstr ""
 
@@ -10858,6 +10861,9 @@ msgstr ""
 msgid "Metrics|Used if the query returns a single series. If it returns multiple series, their legend labels will be picked up from the response."
 msgstr ""
 
+msgid "Metrics|Validating query"
+msgstr ""
+
 msgid "Metrics|Y-axis label"
 msgstr ""
 
@@ -15926,6 +15932,9 @@ msgstr ""
 msgid "Something went wrong while fetching comments. Please try again."
 msgstr ""
 
+msgid "Something went wrong while fetching description changes. Please try again."
+msgstr ""
+
 msgid "Something went wrong while fetching group member contributions"
 msgstr ""
 
@@ -21193,10 +21202,5 @@ msgstr ""
 msgid "with %{additions} additions, %{deletions} deletions."
 msgstr ""
 
-msgid "within %d minute "
-msgid_plural "within %d minutes "
-msgstr[0] ""
-msgstr[1] ""
-
 msgid "yaml invalid"
 msgstr ""
diff --git a/qa/qa/page/admin/overview/users/show.rb b/qa/qa/page/admin/overview/users/show.rb
index 11ea7bcabc8..f15ef0492fc 100644
--- a/qa/qa/page/admin/overview/users/show.rb
+++ b/qa/qa/page/admin/overview/users/show.rb
@@ -10,9 +10,19 @@ module QA
               element :impersonate_user_link
             end
 
+            view 'app/views/admin/users/show.html.haml' do
+              element :confirm_user_button
+            end
+
             def click_impersonate_user
               click_element(:impersonate_user_link)
             end
+
+            def confirm_user
+              accept_confirm do
+                click_element :confirm_user_button
+              end
+            end
           end
         end
       end
diff --git a/qa/qa/page/group/show.rb b/qa/qa/page/group/show.rb
index d4c4be0d6ca..e1f319da134 100644
--- a/qa/qa/page/group/show.rb
+++ b/qa/qa/page/group/show.rb
@@ -18,6 +18,10 @@ module QA
           element :no_result_text, 'No groups or projects matched your search' # rubocop:disable QA/ElementWithPattern
         end
 
+        view 'app/views/shared/members/_access_request_links.html.haml' do
+          element :leave_group_link
+        end
+
         def click_subgroup(name)
           click_link name
         end
@@ -42,6 +46,12 @@ module QA
           click_element :new_in_group_button
         end
 
+        def leave_group
+          accept_alert do
+            click_element :leave_group_link
+          end
+        end
+
         private
 
         def select_kind(kind)
diff --git a/qa/qa/resource/base.rb b/qa/qa/resource/base.rb
index 86de421ba3f..ae20ca1a98e 100644
--- a/qa/qa/resource/base.rb
+++ b/qa/qa/resource/base.rb
@@ -64,12 +64,11 @@ module QA
       end
 
       def visit!
-        Runtime::Logger.debug("Visiting #{web_url}")
+        Runtime::Logger.debug(%Q[Visiting #{self.class.name} at "#{web_url}"]) if Runtime::Env.debug?
 
         Support::Retrier.retry_until do
           visit(web_url)
-
-          wait { current_url == web_url }
+          wait { current_url.include?(URI.parse(web_url).path.split('/').last || web_url) }
         end
       end
 
diff --git a/qa/qa/resource/members.rb b/qa/qa/resource/members.rb
index d70a2907523..c738a91a77f 100644
--- a/qa/qa/resource/members.rb
+++ b/qa/qa/resource/members.rb
@@ -11,6 +11,10 @@ module QA
         post Runtime::API::Request.new(api_client, api_members_path).url, { user_id: user.id, access_level: access_level }
       end
 
+      def list_members
+        JSON.parse(get(Runtime::API::Request.new(api_client, api_members_path).url).body)
+      end
+
       def api_members_path
         "#{api_get_path}/members"
       end
diff --git a/qa/qa/resource/sandbox.rb b/qa/qa/resource/sandbox.rb
index 6ee3dcf350f..6c87fcb377a 100644
--- a/qa/qa/resource/sandbox.rb
+++ b/qa/qa/resource/sandbox.rb
@@ -7,6 +7,8 @@ module QA
     # creating it if it doesn't yet exist.
     #
     class Sandbox < Base
+      include Members
+
       attr_accessor :path
 
       attribute :id
diff --git a/qa/qa/runtime/browser.rb b/qa/qa/runtime/browser.rb
index c914526002c..7e45e5e86ea 100644
--- a/qa/qa/runtime/browser.rb
+++ b/qa/qa/runtime/browser.rb
@@ -57,13 +57,13 @@ module QA
 
         Capybara.register_driver QA::Runtime::Env.browser do |app|
           capabilities = Selenium::WebDriver::Remote::Capabilities.send(QA::Runtime::Env.browser,
-             # This enables access to logs with `page.driver.manage.get_log(:browser)`
-             loggingPrefs: {
-               browser: "ALL",
-               client: "ALL",
-               driver: "ALL",
-               server: "ALL"
-             })
+            # This enables access to logs with `page.driver.manage.get_log(:browser)`
+            loggingPrefs: {
+              browser: "ALL",
+              client: "ALL",
+              driver: "ALL",
+              server: "ALL"
+            })
 
           if QA::Runtime::Env.accept_insecure_certs?
             capabilities['acceptInsecureCerts'] = true
diff --git a/qa/qa/runtime/feature.rb b/qa/qa/runtime/feature.rb
index 75cb9eded55..8c19436ee12 100644
--- a/qa/qa/runtime/feature.rb
+++ b/qa/qa/runtime/feature.rb
@@ -19,6 +19,28 @@ module QA
         set_feature(key, false)
       end
 
+      def remove(key)
+        request = Runtime::API::Request.new(api_client, "/features/#{key}")
+        response = delete(request.url)
+        unless response.code == QA::Support::Api::HTTP_STATUS_NO_CONTENT
+          raise SetFeatureError, "Deleting feature flag #{key} failed with `#{response}`."
+        end
+      end
+
+      def enable_and_verify(key)
+        Support::Retrier.retry_on_exception(sleep_interval: 2) do
+          enable(key)
+
+          is_enabled = false
+
+          QA::Support::Waiter.wait(interval: 1) do
+            is_enabled = enabled?(key)
+          end
+
+          raise SetFeatureError, "#{key} was not enabled!" unless is_enabled
+        end
+      end
+
       def enabled?(key)
         feature = JSON.parse(get_features).find { |flag| flag["name"] == key }
         feature && feature["state"] == "on"
diff --git a/qa/qa/specs/features/browser_ui/1_manage/login/login_via_instance_wide_saml_sso_spec.rb b/qa/qa/specs/features/browser_ui/1_manage/login/login_via_instance_wide_saml_sso_spec.rb
index 101143399f6..ad67f02eaca 100644
--- a/qa/qa/specs/features/browser_ui/1_manage/login/login_via_instance_wide_saml_sso_spec.rb
+++ b/qa/qa/specs/features/browser_ui/1_manage/login/login_via_instance_wide_saml_sso_spec.rb
@@ -8,7 +8,9 @@ module QA
 
         Page::Main::Login.perform(&:sign_in_with_saml)
 
-        Vendor::SAMLIdp::Page::Login.perform(&:login)
+        Vendor::SAMLIdp::Page::Login.perform do |login_page|
+          login_page.login('user1', 'user1pass')
+        end
 
         expect(page).to have_content('Welcome to GitLab')
       end
diff --git a/qa/qa/vendor/saml_idp/page/login.rb b/qa/qa/vendor/saml_idp/page/login.rb
index 1b8c926532a..9ebcabe15fc 100644
--- a/qa/qa/vendor/saml_idp/page/login.rb
+++ b/qa/qa/vendor/saml_idp/page/login.rb
@@ -7,18 +7,22 @@ module QA
     module SAMLIdp
       module Page
         class Login < Page::Base
-          def login
-            fill_in 'username', with: 'user1'
-            fill_in 'password', with: 'user1pass'
+          def login(username, password)
+            QA::Runtime::Logger.debug("Logging into SAMLIdp with username: #{username} and password:#{password}") if QA::Runtime::Env.debug?
+
+            fill_in 'username', with: username
+            fill_in 'password', with: password
             click_on 'Login'
           end
 
-          def login_if_required
-            login if login_required?
+          def login_if_required(username, password)
+            login(username, password) if login_required?
           end
 
           def login_required?
-            page.has_text?('Enter your username and password')
+            login_required = page.has_text?('Enter your username and password')
+            QA::Runtime::Logger.debug("login_required: #{login_required}") if QA::Runtime::Env.debug?
+            login_required
           end
         end
       end
diff --git a/qa/spec/spec_helper.rb b/qa/spec/spec_helper.rb
index ed29bfa41dd..42f1e6f292a 100644
--- a/qa/spec/spec_helper.rb
+++ b/qa/spec/spec_helper.rb
@@ -20,7 +20,7 @@ RSpec.configure do |config|
   QA::Specs::Helpers::Quarantine.configure_rspec
 
   config.before do |example|
-    QA::Runtime::Logger.debug("Starting test: #{example.full_description}") if QA::Runtime::Env.debug?
+    QA::Runtime::Logger.debug("\nStarting test: #{example.full_description}\n") if QA::Runtime::Env.debug?
   end
 
   config.after(:context) do
diff --git a/spec/features/merge_request/user_creates_merge_request_spec.rb b/spec/features/merge_request/user_creates_merge_request_spec.rb
index afb792c2ab9..67f6d8ebe32 100644
--- a/spec/features/merge_request/user_creates_merge_request_spec.rb
+++ b/spec/features/merge_request/user_creates_merge_request_spec.rb
@@ -25,6 +25,11 @@ describe "User creates a merge request", :js do
 
     click_button("Compare branches")
 
+    page.within('.merge-request-form') do
+      expect(page.find('#merge_request_title')['placeholder']).to eq 'Title'
+      expect(page.find('#merge_request_description')['placeholder']).to eq 'Describe the goal of the changes and what reviewers should be aware of.'
+    end
+
     fill_in("Title", with: title)
     click_button("Submit merge request")
 
diff --git a/spec/finders/prometheus_metrics_finder_spec.rb b/spec/finders/prometheus_metrics_finder_spec.rb
new file mode 100644
index 00000000000..41b2e700e1e
--- /dev/null
+++ b/spec/finders/prometheus_metrics_finder_spec.rb
@@ -0,0 +1,144 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe PrometheusMetricsFinder do
+  describe '#execute' do
+    let(:finder) { described_class.new(params) }
+    let(:params) { {} }
+
+    subject { finder.execute }
+
+    context 'with params' do
+      let_it_be(:project) { create(:project) }
+      let_it_be(:project_metric) { create(:prometheus_metric, project: project) }
+      let_it_be(:common_metric) { create(:prometheus_metric, :common) }
+      let_it_be(:unique_metric) do
+        create(
+          :prometheus_metric,
+          :common,
+          title: 'Unique title',
+          y_label: 'Unique y_label',
+          group: :kubernetes,
+          identifier: 'identifier',
+          created_at: 5.minutes.ago
+        )
+      end
+
+      context 'with appropriate indexes' do
+        before do
+          allow_any_instance_of(described_class).to receive(:appropriate_index?).and_return(true)
+        end
+
+        context 'with project' do
+          let(:params) { { project: project } }
+
+          it { is_expected.to eq([project_metric]) }
+        end
+
+        context 'with group' do
+          let(:params) { { group: project_metric.group } }
+
+          it { is_expected.to contain_exactly(common_metric, project_metric) }
+        end
+
+        context 'with title' do
+          let(:params) { { title: project_metric.title } }
+
+          it { is_expected.to contain_exactly(project_metric, common_metric) }
+        end
+
+        context 'with y_label' do
+          let(:params) { { y_label: project_metric.y_label } }
+
+          it { is_expected.to contain_exactly(project_metric, common_metric) }
+        end
+
+        context 'with common' do
+          let(:params) { { common: true } }
+
+          it { is_expected.to contain_exactly(common_metric, unique_metric) }
+        end
+
+        context 'with ordered' do
+          let(:params) { { ordered: true } }
+
+          it { is_expected.to eq([unique_metric, project_metric, common_metric]) }
+        end
+
+        context 'with indentifier' do
+          let(:params) { { identifier: unique_metric.identifier } }
+
+          it 'raises an error' do
+            expect { subject }.to raise_error(
+              ArgumentError,
+              ':identifier must be scoped to a :project or :common'
+            )
+          end
+
+          context 'with common' do
+            let(:params) { { identifier: unique_metric.identifier, common: true } }
+
+            it { is_expected.to contain_exactly(unique_metric) }
+          end
+
+          context 'with id' do
+            let(:params) { { id: 14, identifier: 'string' } }
+
+            it 'raises an error' do
+              expect { subject }.to raise_error(
+                ArgumentError,
+                'Only one of :identifier, :id is permitted'
+              )
+            end
+          end
+        end
+
+        context 'with id' do
+          let(:params) { { id: common_metric.id } }
+
+          it { is_expected.to contain_exactly(common_metric) }
+        end
+
+        context 'with multiple params' do
+          let(:params) do
+            {
+              group: project_metric.group,
+              title: project_metric.title,
+              y_label: project_metric.y_label,
+              common: true,
+              ordered: true
+            }
+          end
+
+          it { is_expected.to contain_exactly(common_metric) }
+        end
+      end
+
+      context 'without an appropriate index' do
+        let(:params) do
+          {
+            title: project_metric.title,
+            ordered: true
+          }
+        end
+
+        it 'raises an error' do
+          expect { subject }.to raise_error(
+            ArgumentError,
+            'An index should exist for params: [:title]'
+          )
+        end
+      end
+    end
+
+    context 'without params' do
+      it 'raises an error' do
+        expect { subject }.to raise_error(
+          ArgumentError,
+          'Please provide one or more of: [:project, :group, :title, :y_label, :identifier, :id, :common, :ordered]'
+        )
+      end
+    end
+  end
+end
diff --git a/spec/frontend/helpers/monitor_helper_spec.js b/spec/frontend/helpers/monitor_helper_spec.js
index c36b603b251..0798ca580e2 100644
--- a/spec/frontend/helpers/monitor_helper_spec.js
+++ b/spec/frontend/helpers/monitor_helper_spec.js
@@ -81,6 +81,17 @@ describe('monitor helper', () => {
       expect(result.name).toEqual('brpop, brpop');
     });
 
+    it('supports hyphenated template variables', () => {
+      const config = { ...defaultConfig, name: 'expired - {{ test-attribute }}' };
+
+      const [result] = monitorHelper.makeDataSeries(
+        [{ metric: { 'test-attribute': 'test-attribute-value' }, values: series }],
+        config,
+      );
+
+      expect(result.name).toEqual('expired - test-attribute-value');
+    });
+
     it('updates multiple series names from templates', () => {
       const config = {
         ...defaultConfig,
diff --git a/spec/frontend/notes/mock_data.js b/spec/frontend/notes/mock_data.js
index dc914ce8355..01cb70d395c 100644
--- a/spec/frontend/notes/mock_data.js
+++ b/spec/frontend/notes/mock_data.js
@@ -1094,8 +1094,9 @@ export const collapsedSystemNotes = [
         noteable_type: 'Issue',
         resolvable: false,
         noteable_iid: 12,
+        start_description_version_id: undefined,
         note: 'changed the description',
-        note_html: ' <p dir="auto">changed the description 2 times within 1 minute </p>',
+        note_html: '<p dir="auto">changed the description</p>',
         current_user: { can_edit: false, can_award_emoji: true },
         resolved: false,
         resolved_by: null,
@@ -1106,7 +1107,6 @@ export const collapsedSystemNotes = [
           '/abuse_reports/new?ref_url=http%3A%2F%2Flocalhost%3A3000%2Fgitlab-org%2Fgitlab-shell%2Fissues%2F12%23note_905&user_id=1',
         human_access: 'Owner',
         path: '/gitlab-org/gitlab-shell/notes/905',
-        times_updated: 2,
       },
     ],
     individual_note: true,
diff --git a/spec/frontend/registry/components/collapsible_container_spec.js b/spec/frontend/registry/components/collapsible_container_spec.js
index f93ebab1a4d..d035055afd3 100644
--- a/spec/frontend/registry/components/collapsible_container_spec.js
+++ b/spec/frontend/registry/components/collapsible_container_spec.js
@@ -1,10 +1,11 @@
 import Vue from 'vue';
 import Vuex from 'vuex';
 import { mount, createLocalVue } from '@vue/test-utils';
-import collapsibleComponent from '~/registry/components/collapsible_container.vue';
-import { repoPropsData } from '../mock_data';
 import createFlash from '~/flash';
+import Tracking from '~/tracking';
+import collapsibleComponent from '~/registry/components/collapsible_container.vue';
 import * as getters from '~/registry/stores/getters';
+import { repoPropsData } from '../mock_data';
 
 jest.mock('~/flash.js');
 
@@ -16,9 +17,10 @@ describe('collapsible registry container', () => {
   let wrapper;
   let store;
 
-  const findDeleteBtn = w => w.find('.js-remove-repo');
-  const findContainerImageTags = w => w.find('.container-image-tags');
-  const findToggleRepos = w => w.findAll('.js-toggle-repo');
+  const findDeleteBtn = (w = wrapper) => w.find('.js-remove-repo');
+  const findContainerImageTags = (w = wrapper) => w.find('.container-image-tags');
+  const findToggleRepos = (w = wrapper) => w.findAll('.js-toggle-repo');
+  const findDeleteModal = (w = wrapper) => w.find({ ref: 'deleteModal' });
 
   const mountWithStore = config => mount(collapsibleComponent, { ...config, store, localVue });
 
@@ -124,4 +126,45 @@ describe('collapsible registry container', () => {
       expect(deleteBtn.exists()).toBe(false);
     });
   });
+
+  describe('tracking', () => {
+    const category = 'mock_page';
+    beforeEach(() => {
+      jest.spyOn(Tracking, 'event');
+      wrapper.vm.deleteItem = jest.fn().mockResolvedValue();
+      wrapper.vm.fetchRepos = jest.fn();
+      wrapper.setData({
+        tracking: {
+          ...wrapper.vm.tracking,
+          category,
+        },
+      });
+    });
+
+    it('send an event when delete button is clicked', () => {
+      const deleteBtn = findDeleteBtn();
+      deleteBtn.trigger('click');
+      expect(Tracking.event).toHaveBeenCalledWith(category, 'click_button', {
+        label: 'registry_repository_delete',
+        category,
+      });
+    });
+    it('send an event when cancel is pressed on modal', () => {
+      const deleteModal = findDeleteModal();
+      deleteModal.vm.$emit('cancel');
+      expect(Tracking.event).toHaveBeenCalledWith(category, 'cancel_delete', {
+        label: 'registry_repository_delete',
+        category,
+      });
+    });
+    it('send an event when confirm is clicked on modal', () => {
+      const deleteModal = findDeleteModal();
+      deleteModal.vm.$emit('ok');
+
+      expect(Tracking.event).toHaveBeenCalledWith(category, 'confirm_delete', {
+        label: 'registry_repository_delete',
+        category,
+      });
+    });
+  });
 });
diff --git a/spec/frontend/registry/components/table_registry_spec.js b/spec/frontend/registry/components/table_registry_spec.js
index 7cb7c012d9d..ab88caf44e1 100644
--- a/spec/frontend/registry/components/table_registry_spec.js
+++ b/spec/frontend/registry/components/table_registry_spec.js
@@ -1,10 +1,14 @@
 import Vue from 'vue';
 import Vuex from 'vuex';
-import tableRegistry from '~/registry/components/table_registry.vue';
 import { mount, createLocalVue } from '@vue/test-utils';
+import createFlash from '~/flash';
+import Tracking from '~/tracking';
+import tableRegistry from '~/registry/components/table_registry.vue';
 import { repoPropsData } from '../mock_data';
 import * as getters from '~/registry/stores/getters';
 
+jest.mock('~/flash');
+
 const [firstImage, secondImage] = repoPropsData.list;
 
 const localVue = createLocalVue();
@@ -15,11 +19,12 @@ describe('table registry', () => {
   let wrapper;
   let store;
 
-  const findSelectAllCheckbox = w => w.find('.js-select-all-checkbox > input');
-  const findSelectCheckboxes = w => w.findAll('.js-select-checkbox > input');
-  const findDeleteButton = w => w.find('.js-delete-registry');
-  const findDeleteButtonsRow = w => w.findAll('.js-delete-registry-row');
-  const findPagination = w => w.find('.js-registry-pagination');
+  const findSelectAllCheckbox = (w = wrapper) => w.find('.js-select-all-checkbox > input');
+  const findSelectCheckboxes = (w = wrapper) => w.findAll('.js-select-checkbox > input');
+  const findDeleteButton = (w = wrapper) => w.find({ ref: 'bulkDeleteButton' });
+  const findDeleteButtonsRow = (w = wrapper) => w.findAll('.js-delete-registry-row');
+  const findPagination = (w = wrapper) => w.find('.js-registry-pagination');
+  const findDeleteModal = (w = wrapper) => w.find({ ref: 'deleteModal' });
   const bulkDeletePath = 'path';
 
   const mountWithStore = config => mount(tableRegistry, { ...config, store, localVue });
@@ -139,7 +144,7 @@ describe('table registry', () => {
         },
       });
       wrapper.vm.handleMultipleDelete();
-      expect(wrapper.vm.showError).toHaveBeenCalled();
+      expect(createFlash).toHaveBeenCalled();
     });
   });
 
@@ -169,6 +174,27 @@ describe('table registry', () => {
     });
   });
 
+  describe('modal event handlers', () => {
+    beforeEach(() => {
+      wrapper.vm.handleSingleDelete = jest.fn();
+      wrapper.vm.handleMultipleDelete = jest.fn();
+    });
+    it('on ok when one item is selected should call singleDelete', () => {
+      wrapper.setData({ itemsToBeDeleted: [0] });
+      wrapper.vm.onDeletionConfirmed();
+
+      expect(wrapper.vm.handleSingleDelete).toHaveBeenCalledWith(repoPropsData.list[0]);
+      expect(wrapper.vm.handleMultipleDelete).not.toHaveBeenCalled();
+    });
+    it('on ok when multiple items are selected should call muultiDelete', () => {
+      wrapper.setData({ itemsToBeDeleted: [0, 1, 2] });
+      wrapper.vm.onDeletionConfirmed();
+
+      expect(wrapper.vm.handleMultipleDelete).toHaveBeenCalled();
+      expect(wrapper.vm.handleSingleDelete).not.toHaveBeenCalled();
+    });
+  });
+
   describe('pagination', () => {
     const repo = {
       repoPropsData,
@@ -265,4 +291,83 @@ describe('table registry', () => {
       expect(deleteBtns.length).toBe(0);
     });
   });
+
+  describe('event tracking', () => {
+    const mockPageName = 'mock_page';
+
+    beforeEach(() => {
+      jest.spyOn(Tracking, 'event');
+      wrapper.vm.handleSingleDelete = jest.fn();
+      wrapper.vm.handleMultipleDelete = jest.fn();
+      document.body.dataset.page = mockPageName;
+    });
+
+    afterEach(() => {
+      document.body.dataset.page = null;
+    });
+
+    describe('single tag delete', () => {
+      beforeEach(() => {
+        wrapper.setData({ itemsToBeDeleted: [0] });
+      });
+
+      it('send an event when delete button is clicked', () => {
+        const deleteBtn = findDeleteButtonsRow();
+        deleteBtn.at(0).trigger('click');
+        expect(Tracking.event).toHaveBeenCalledWith(mockPageName, 'click_button', {
+          label: 'registry_tag_delete',
+          property: 'foo',
+        });
+      });
+      it('send an event when cancel is pressed on modal', () => {
+        const deleteModal = findDeleteModal();
+        deleteModal.vm.$emit('cancel');
+        expect(Tracking.event).toHaveBeenCalledWith(mockPageName, 'cancel_delete', {
+          label: 'registry_tag_delete',
+          property: 'foo',
+        });
+      });
+      it('send an event when confirm is clicked on modal', () => {
+        const deleteModal = findDeleteModal();
+        deleteModal.vm.$emit('ok');
+
+        expect(Tracking.event).toHaveBeenCalledWith(mockPageName, 'confirm_delete', {
+          label: 'registry_tag_delete',
+          property: 'foo',
+        });
+      });
+    });
+    describe('bulk tag delete', () => {
+      beforeEach(() => {
+        const items = [0, 1, 2];
+        wrapper.setData({ itemsToBeDeleted: items, selectedItems: items });
+      });
+
+      it('send an event when delete button is clicked', () => {
+        const deleteBtn = findDeleteButton();
+        deleteBtn.vm.$emit('click');
+        expect(Tracking.event).toHaveBeenCalledWith(mockPageName, 'click_button', {
+          label: 'bulk_registry_tag_delete',
+          property: 'foo',
+        });
+      });
+      it('send an event when cancel is pressed on modal', () => {
+        const deleteModal = findDeleteModal();
+        deleteModal.vm.$emit('cancel');
+        expect(Tracking.event).toHaveBeenCalledWith(mockPageName, 'cancel_delete', {
+          label: 'bulk_registry_tag_delete',
+          property: 'foo',
+        });
+      });
+      it('send an event when confirm is clicked on modal', () => {
+        const deleteModal = findDeleteModal();
+        deleteModal.vm.$emit('ok');
+
+        expect(Tracking.event).toHaveBeenCalledWith(mockPageName, 'confirm_delete', {
+          label: 'bulk_registry_tag_delete',
+          property: 'foo',
+        });
+      });
+    });
+  });
 });
diff --git a/spec/frontend/vue_shared/components/notes/system_note_spec.js b/spec/frontend/vue_shared/components/notes/system_note_spec.js
index a65e3eb294a..c2e8359f78d 100644
--- a/spec/frontend/vue_shared/components/notes/system_note_spec.js
+++ b/spec/frontend/vue_shared/components/notes/system_note_spec.js
@@ -57,7 +57,7 @@ describe('system note component', () => {
   // we need to strip them because they break layout of commit lists in system notes:
   // https://gitlab.com/gitlab-org/gitlab-foss/uploads/b07a10670919254f0220d3ff5c1aa110/jqzI.png
   it('removes wrapping paragraph from note HTML', () => {
-    expect(vm.$el.querySelector('.system-note-message').innerHTML).toEqual('<span>closed</span>');
+    expect(vm.$el.querySelector('.system-note-message').innerHTML).toContain('<span>closed</span>');
   });
 
   it('should initMRPopovers onMount', () => {
diff --git a/spec/javascripts/bootstrap_jquery_spec.js b/spec/javascripts/bootstrap_jquery_spec.js
index 35340a3bc42..6957cf40301 100644
--- a/spec/javascripts/bootstrap_jquery_spec.js
+++ b/spec/javascripts/bootstrap_jquery_spec.js
@@ -1,5 +1,3 @@
-/* eslint-disable no-var */
-
 import $ from 'jquery';
 import '~/commons/bootstrap';
 
@@ -10,15 +8,13 @@ describe('Bootstrap jQuery extensions', function() {
     });
 
     it('adds the disabled attribute', function() {
-      var $input;
-      $input = $('input').first();
+      const $input = $('input').first();
       $input.disable();
 
       expect($input).toHaveAttr('disabled', 'disabled');
     });
     return it('adds the disabled class', function() {
-      var $input;
-      $input = $('input').first();
+      const $input = $('input').first();
       $input.disable();
 
       expect($input).toHaveClass('disabled');
@@ -30,15 +26,13 @@ describe('Bootstrap jQuery extensions', function() {
     });
 
     it('removes the disabled attribute', function() {
-      var $input;
-      $input = $('input').first();
+      const $input = $('input').first();
       $input.enable();
 
       expect($input).not.toHaveAttr('disabled');
     });
     return it('removes the disabled class', function() {
-      var $input;
-      $input = $('input').first();
+      const $input = $('input').first();
       $input.enable();
 
       expect($input).not.toHaveClass('disabled');
diff --git a/spec/javascripts/monitoring/components/dashboard_spec.js b/spec/javascripts/monitoring/components/dashboard_spec.js
index 674db7c7afb..0f20171726c 100644
--- a/spec/javascripts/monitoring/components/dashboard_spec.js
+++ b/spec/javascripts/monitoring/components/dashboard_spec.js
@@ -122,6 +122,32 @@ describe('Dashboard', () => {
     });
   });
 
+  describe('cluster health', () => {
+    let wrapper;
+
+    beforeEach(done => {
+      wrapper = shallowMount(DashboardComponent, {
+        localVue,
+        sync: false,
+        propsData: { ...propsData, hasMetrics: true },
+        store,
+      });
+
+      // all_dashboards is not defined in health dashboards
+      wrapper.vm.$store.commit(`monitoringDashboard/${types.SET_ALL_DASHBOARDS}`, undefined);
+      wrapper.vm.$nextTick(done);
+    });
+
+    afterEach(() => {
+      wrapper.destroy();
+    });
+
+    it('renders correctly', () => {
+      expect(wrapper.isVueInstance()).toBe(true);
+      expect(wrapper.exists()).toBe(true);
+    });
+  });
+
   describe('requests information to the server', () => {
     let spy;
     beforeEach(() => {
diff --git a/spec/javascripts/monitoring/store/mutations_spec.js b/spec/javascripts/monitoring/store/mutations_spec.js
index 498c1a9e9b1..91948b83eec 100644
--- a/spec/javascripts/monitoring/store/mutations_spec.js
+++ b/spec/javascripts/monitoring/store/mutations_spec.js
@@ -144,7 +144,19 @@ describe('Monitoring mutations', () => {
   });
 
   describe('SET_ALL_DASHBOARDS', () => {
-    it('stores the dashboards loaded from the git repository', () => {
+    it('stores `undefined` dashboards as an empty array', () => {
+      mutations[types.SET_ALL_DASHBOARDS](stateCopy, undefined);
+
+      expect(stateCopy.allDashboards).toEqual([]);
+    });
+
+    it('stores `null` dashboards as an empty array', () => {
+      mutations[types.SET_ALL_DASHBOARDS](stateCopy, null);
+
+      expect(stateCopy.allDashboards).toEqual([]);
+    });
+
+    it('stores dashboards loaded from the git repository', () => {
       mutations[types.SET_ALL_DASHBOARDS](stateCopy, dashboardGitResponse);
 
       expect(stateCopy.allDashboards).toEqual(dashboardGitResponse);
diff --git a/spec/javascripts/notes/stores/collapse_utils_spec.js b/spec/javascripts/notes/stores/collapse_utils_spec.js
index 8ede9319088..d3019f4b9a4 100644
--- a/spec/javascripts/notes/stores/collapse_utils_spec.js
+++ b/spec/javascripts/notes/stores/collapse_utils_spec.js
@@ -1,6 +1,5 @@
 import {
   isDescriptionSystemNote,
-  changeDescriptionNote,
   getTimeDifferenceMinutes,
   collapseSystemNotes,
 } from '~/notes/stores/collapse_utils';
@@ -24,15 +23,6 @@ describe('Collapse utils', () => {
     );
   });
 
-  it('changes the description to contain the number of changed times', () => {
-    const changedNote = changeDescriptionNote(mockSystemNote, 3, 5);
-
-    expect(changedNote.times_updated).toEqual(3);
-    expect(changedNote.note_html.trim()).toContain(
-      '<p dir="auto">changed the description 3 times within 5 minutes </p>',
-    );
-  });
-
   it('gets the time difference between two notes', () => {
     const anotherSystemNote = {
       created_at: '2018-05-14T21:33:00.000Z',
diff --git a/spec/lib/gitlab/graphql/connections/filterable_array_connection_spec.rb b/spec/lib/gitlab/graphql/connections/filterable_array_connection_spec.rb
new file mode 100644
index 00000000000..1fda84f777e
--- /dev/null
+++ b/spec/lib/gitlab/graphql/connections/filterable_array_connection_spec.rb
@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Gitlab::Graphql::Connections::FilterableArrayConnection do
+  let(:callback) { proc { |nodes| nodes } }
+  let(:all_nodes) { Gitlab::Graphql::FilterableArray.new(callback, 1, 2, 3, 4, 5) }
+  let(:arguments) { {} }
+  subject(:connection) do
+    described_class.new(all_nodes, arguments, max_page_size: 3)
+  end
+
+  describe '#paged_nodes' do
+    let(:paged_nodes) { subject.paged_nodes }
+
+    it_behaves_like "connection with paged nodes"
+
+    context 'when callback filters some nodes' do
+      let(:callback) { proc { |nodes| nodes[1..-1] } }
+
+      it 'does not return filtered elements' do
+        expect(subject.paged_nodes).to contain_exactly(all_nodes[1], all_nodes[2])
+      end
+    end
+  end
+end
diff --git a/spec/lib/gitlab/graphql/connections/keyset/connection_spec.rb b/spec/lib/gitlab/graphql/connections/keyset/connection_spec.rb
index ba1addadb5a..9dda2a41ec6 100644
--- a/spec/lib/gitlab/graphql/connections/keyset/connection_spec.rb
+++ b/spec/lib/gitlab/graphql/connections/keyset/connection_spec.rb
@@ -240,38 +240,16 @@ describe Gitlab::Graphql::Connections::Keyset::Connection do
   end
 
   describe '#paged_nodes' do
-    let!(:projects) { create_list(:project, 5) }
+    let_it_be(:all_nodes) { create_list(:project, 5) }
+    let(:paged_nodes) { subject.paged_nodes }
 
-    it 'returns the collection limited to max page size' do
-      expect(subject.paged_nodes.size).to eq(3)
-    end
-
-    it 'is a loaded memoized array' do
-      expect(subject.paged_nodes).to be_an(Array)
-      expect(subject.paged_nodes.object_id).to eq(subject.paged_nodes.object_id)
-    end
-
-    context 'when `first` is passed' do
-      let(:arguments) { { first: 2 } }
-
-      it 'returns only the first elements' do
-        expect(subject.paged_nodes).to contain_exactly(projects.first, projects.second)
-      end
-    end
-
-    context 'when `last` is passed' do
-      let(:arguments) { { last: 2 } }
-
-      it 'returns only the last elements' do
-        expect(subject.paged_nodes).to contain_exactly(projects[3], projects[4])
-      end
-    end
+    it_behaves_like "connection with paged nodes"
 
     context 'when both are passed' do
       let(:arguments) { { first: 2, last: 2 } }
 
       it 'raises an error' do
-        expect { subject.paged_nodes }.to raise_error(Gitlab::Graphql::Errors::ArgumentError)
+        expect { paged_nodes }.to raise_error(Gitlab::Graphql::Errors::ArgumentError)
       end
     end
 
diff --git a/spec/lib/gitlab/prometheus/queries/knative_invocation_query_spec.rb b/spec/lib/gitlab/prometheus/queries/knative_invocation_query_spec.rb
index 7f6283715f2..6361893c53c 100644
--- a/spec/lib/gitlab/prometheus/queries/knative_invocation_query_spec.rb
+++ b/spec/lib/gitlab/prometheus/queries/knative_invocation_query_spec.rb
@@ -13,14 +13,19 @@ describe Gitlab::Prometheus::Queries::KnativeInvocationQuery do
 
   context 'verify queries' do
     before do
-      allow(PrometheusMetric).to receive(:find_by_identifier).and_return(create(:prometheus_metric, query: prometheus_istio_query('test-name', 'test-ns')))
-      allow(client).to receive(:query_range)
+      create(:prometheus_metric,
+             :common,
+             identifier: :system_metrics_knative_function_invocation_count,
+             query: 'sum(ceil(rate(istio_requests_total{destination_service_namespace="%{kube_namespace}", destination_app=~"%{function_name}.*"}[1m])*60))')
     end
 
     it 'has the query, but no data' do
-      results = subject.query(serverless_func.id)
+      expect(client).to receive(:query_range).with(
+        'sum(ceil(rate(istio_requests_total{destination_service_namespace="test-ns", destination_app=~"test-name.*"}[1m])*60))',
+        hash_including(:start, :stop)
+      )
 
-      expect(results.queries[0][:query_range]).to eql('floor(sum(rate(istio_revision_request_count{destination_configuration="test-name", destination_namespace="test-ns"}[1m])*30))')
+      subject.query(serverless_func.id)
     end
   end
 end
diff --git a/spec/support/helpers/graphql_helpers.rb b/spec/support/helpers/graphql_helpers.rb
index 6fb1d279456..80a3f7df05f 100644
--- a/spec/support/helpers/graphql_helpers.rb
+++ b/spec/support/helpers/graphql_helpers.rb
@@ -37,9 +37,12 @@ module GraphqlHelpers
   # BatchLoader::GraphQL returns a wrapper, so we need to :sync in order
   # to get the actual values
   def batch_sync(max_queries: nil, &blk)
-    result = batch(max_queries: nil, &blk)
+    wrapper = proc do
+      lazy_vals = yield
+      lazy_vals.is_a?(Array) ? lazy_vals.map(&:sync) : lazy_vals&.sync
+    end
 
-    result.is_a?(Array) ? result.map(&:sync) : result&.sync
+    batch(max_queries: max_queries, &wrapper)
   end
 
   def graphql_query_for(name, attributes = {}, fields = nil)
@@ -157,7 +160,13 @@ module GraphqlHelpers
 
   def attributes_to_graphql(attributes)
     attributes.map do |name, value|
-      "#{GraphqlHelpers.fieldnamerize(name.to_s)}: \"#{value}\""
+      value_str = if value.is_a?(Array)
+                    '["' + value.join('","') + '"]'
+                  else
+                    "\"#{value}\""
+                  end
+
+      "#{GraphqlHelpers.fieldnamerize(name.to_s)}: #{value_str}"
     end.join(", ")
   end
 
@@ -282,6 +291,12 @@ module GraphqlHelpers
   def allow_high_graphql_recursion
     allow_any_instance_of(Gitlab::Graphql::QueryAnalyzers::RecursionAnalyzer).to receive(:recursion_threshold).and_return 1000
   end
+
+  def node_array(data, extract_attribute = nil)
+    data.map do |item|
+      extract_attribute ? item['node'][extract_attribute] : item['node']
+    end
+  end
 end
 
 # This warms our schema, doing this as part of loading the helpers to avoid
diff --git a/spec/support/shared_examples/graphql/connection_paged_nodes.rb b/spec/support/shared_examples/graphql/connection_paged_nodes.rb
new file mode 100644
index 00000000000..830d2d2d4b1
--- /dev/null
+++ b/spec/support/shared_examples/graphql/connection_paged_nodes.rb
@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+
+RSpec.shared_examples 'connection with paged nodes' do
+  it 'returns the collection limited to max page size' do
+    expect(paged_nodes.size).to eq(3)
+  end
+
+  it 'is a loaded memoized array' do
+    expect(paged_nodes).to be_an(Array)
+    expect(paged_nodes.object_id).to eq(paged_nodes.object_id)
+  end
+
+  context 'when `first` is passed' do
+    let(:arguments) { { first: 2 } }
+
+    it 'returns only the first elements' do
+      expect(paged_nodes).to contain_exactly(all_nodes.first, all_nodes.second)
+    end
+  end
+
+  context 'when `last` is passed' do
+    let(:arguments) { { last: 2 } }
+
+    it 'returns only the last elements' do
+      expect(paged_nodes).to contain_exactly(all_nodes[3], all_nodes[4])
+    end
+  end
+end