diff --git a/app/assets/javascripts/clusters_list/components/clusters.vue b/app/assets/javascripts/clusters_list/components/clusters.vue
index 0b98f9c0101..9b1c45a3a49 100644
--- a/app/assets/javascripts/clusters_list/components/clusters.vue
+++ b/app/assets/javascripts/clusters_list/components/clusters.vue
@@ -43,17 +43,17 @@ export default {
           key: 'environment_scope',
           label: __('Environment scope'),
         },
-        // Wait for backend to send these fields
+        {
+          key: 'node_size',
+          label: __('Nodes'),
+        },
+        // Fields are missing calculation methods and not ready to display
         // {
-        //  key: 'size',
-        //  label: __('Size'),
-        // },
-        // {
-        //  key: 'cpu',
+        //  key: 'node_cpu',
         //  label: __('Total cores (vCPUs)'),
         // },
         // {
-        //  key: 'memory',
+        //  key: 'node_memory',
         //  label: __('Total memory (GB)'),
         // },
         {
@@ -111,6 +111,14 @@ export default {
           ></div>
         </div>
       </template>
+
+      <template #cell(node_size)="{ item }">
+        <span v-if="item.nodes">{{ item.nodes.length }}</span>
+        <small v-else class="gl-font-sm gl-font-style-italic gl-text-gray-400">{{
+          __('Unknown')
+        }}</small>
+      </template>
+
       <template #cell(cluster_type)="{value}">
         <gl-badge variant="light">
           {{ value }}
diff --git a/app/assets/javascripts/clusters_list/constants.js b/app/assets/javascripts/clusters_list/constants.js
index eebcaa086f9..077bf0b8925 100644
--- a/app/assets/javascripts/clusters_list/constants.js
+++ b/app/assets/javascripts/clusters_list/constants.js
@@ -6,6 +6,8 @@ export const CLUSTER_TYPES = {
   instance_type: __('Instance'),
 };
 
+export const MAX_REQUESTS = 3;
+
 export const STATUSES = {
   default: { className: 'bg-white', title: __('Unknown') },
   disabled: { className: 'disabled', title: __('Disabled') },
diff --git a/app/assets/javascripts/clusters_list/store/actions.js b/app/assets/javascripts/clusters_list/store/actions.js
index 919625f69b4..5245c307c8c 100644
--- a/app/assets/javascripts/clusters_list/store/actions.js
+++ b/app/assets/javascripts/clusters_list/store/actions.js
@@ -2,10 +2,23 @@ import Poll from '~/lib/utils/poll';
 import axios from '~/lib/utils/axios_utils';
 import flash from '~/flash';
 import { __ } from '~/locale';
+import { MAX_REQUESTS } from '../constants';
 import { parseIntPagination, normalizeHeaders } from '~/lib/utils/common_utils';
+import * as Sentry from '@sentry/browser';
 import * as types from './mutation_types';
 
+const allNodesPresent = (clusters, retryCount) => {
+  /*
+    Nodes are coming from external Kubernetes clusters.
+    They may fail for reasons GitLab cannot control.
+    MAX_REQUESTS will ensure this poll stops at some point.
+  */
+  return retryCount > MAX_REQUESTS || clusters.every(cluster => cluster.nodes != null);
+};
+
 export const fetchClusters = ({ state, commit }) => {
+  let retryCount = 0;
+
   const poll = new Poll({
     resource: {
       fetchClusters: paginatedEndPoint => axios.get(paginatedEndPoint),
@@ -13,16 +26,40 @@ export const fetchClusters = ({ state, commit }) => {
     data: `${state.endpoint}?page=${state.page}`,
     method: 'fetchClusters',
     successCallback: ({ data, headers }) => {
-      if (data.clusters) {
-        const normalizedHeaders = normalizeHeaders(headers);
-        const paginationInformation = parseIntPagination(normalizedHeaders);
+      retryCount += 1;
 
-        commit(types.SET_CLUSTERS_DATA, { data, paginationInformation });
-        commit(types.SET_LOADING_STATE, false);
+      try {
+        if (data.clusters) {
+          const normalizedHeaders = normalizeHeaders(headers);
+          const paginationInformation = parseIntPagination(normalizedHeaders);
+
+          commit(types.SET_CLUSTERS_DATA, { data, paginationInformation });
+          commit(types.SET_LOADING_STATE, false);
+
+          if (allNodesPresent(data.clusters, retryCount)) {
+            poll.stop();
+          }
+        }
+      } catch (error) {
         poll.stop();
+
+        Sentry.withScope(scope => {
+          scope.setTag('javascript_clusters_list', 'fetchClustersSuccessCallback');
+          Sentry.captureException(error);
+        });
       }
     },
-    errorCallback: () => flash(__('An error occurred while loading clusters')),
+    errorCallback: response => {
+      poll.stop();
+
+      commit(types.SET_LOADING_STATE, false);
+      flash(__('Clusters|An error occurred while loading clusters'));
+
+      Sentry.withScope(scope => {
+        scope.setTag('javascript_clusters_list', 'fetchClustersErrorCallback');
+        Sentry.captureException(response);
+      });
+    },
   });
 
   poll.makeRequest();
diff --git a/app/assets/javascripts/notes/components/comment_form.vue b/app/assets/javascripts/notes/components/comment_form.vue
index a070cf8866a..9b911f99c83 100644
--- a/app/assets/javascripts/notes/components/comment_form.vue
+++ b/app/assets/javascripts/notes/components/comment_form.vue
@@ -412,7 +412,7 @@ js-gfm-input js-autosize markdown-area js-vue-textarea qa-comment-input"
             </gl-alert>
             <div class="note-form-actions">
               <div
-                class="float-left btn-group
+                class="btn-group
 append-right-10 comment-type-dropdown js-comment-type-dropdown droplab-dropdown"
               >
                 <button
diff --git a/app/assets/javascripts/static_site_editor/components/edit_area.vue b/app/assets/javascripts/static_site_editor/components/edit_area.vue
index dff21d919a9..fa142385f06 100644
--- a/app/assets/javascripts/static_site_editor/components/edit_area.vue
+++ b/app/assets/javascripts/static_site_editor/components/edit_area.vue
@@ -47,7 +47,7 @@ export default {
 };
 </script>
 <template>
-  <div class="d-flex flex-grow-1 flex-column">
+  <div class="d-flex flex-grow-1 flex-column h-100">
     <edit-header class="py-2" :title="title" />
     <rich-content-editor v-model="editableContent" class="mb-9" />
     <publish-toolbar
diff --git a/app/assets/stylesheets/pages/storage_quota.scss b/app/assets/stylesheets/pages/storage_quota.scss
index 97ae4f0ade4..347bd1316c0 100644
--- a/app/assets/stylesheets/pages/storage_quota.scss
+++ b/app/assets/stylesheets/pages/storage_quota.scss
@@ -9,14 +9,8 @@
     @include gl-rounded-bottom-right-base;
   }
 
-  &:not(:first-child) {
-    @include gl-border-l-1;
-    @include gl-border-l-solid;
-    @include gl-border-white;
-  }
-
   &:not(:last-child) {
-    @include gl-border-r-1;
+    @include gl-border-r-2;
     @include gl-border-r-solid;
     @include gl-border-white;
   }
diff --git a/app/controllers/clusters/clusters_controller.rb b/app/controllers/clusters/clusters_controller.rb
index aa39d430b24..46dec5f3287 100644
--- a/app/controllers/clusters/clusters_controller.rb
+++ b/app/controllers/clusters/clusters_controller.rb
@@ -23,6 +23,7 @@ class Clusters::ClustersController < Clusters::BaseController
     respond_to do |format|
       format.html
       format.json do
+        Gitlab::PollingInterval.set_header(response, interval: STATUS_POLLING_INTERVAL)
         serializer = ClusterSerializer.new(current_user: current_user)
 
         render json: {
diff --git a/app/controllers/concerns/issuable_collections.rb b/app/controllers/concerns/issuable_collections.rb
index 5aa00af8910..9ef067e8797 100644
--- a/app/controllers/concerns/issuable_collections.rb
+++ b/app/controllers/concerns/issuable_collections.rb
@@ -5,7 +5,6 @@ module IssuableCollections
   include PaginatedCollection
   include SortingHelper
   include SortingPreference
-  include Gitlab::IssuableMetadata
   include Gitlab::Utils::StrongMemoize
 
   included do
@@ -44,7 +43,7 @@ module IssuableCollections
   def set_pagination
     @issuables          = @issuables.page(params[:page])
     @issuables          = per_page_for_relative_position if params[:sort] == 'relative_position'
-    @issuable_meta_data = issuable_meta_data(@issuables, collection_type, current_user)
+    @issuable_meta_data = Gitlab::IssuableMetadata.new(current_user, @issuables).data
     @total_pages        = issuable_page_count(@issuables)
   end
   # rubocop:enable Gitlab/ModuleWithInstanceVariables
diff --git a/app/controllers/concerns/issuable_collections_action.rb b/app/controllers/concerns/issuable_collections_action.rb
index 78b3c6771b3..e3ac117660b 100644
--- a/app/controllers/concerns/issuable_collections_action.rb
+++ b/app/controllers/concerns/issuable_collections_action.rb
@@ -11,7 +11,7 @@ module IssuableCollectionsAction
               .non_archived
               .page(params[:page])
 
-    @issuable_meta_data = issuable_meta_data(@issues, collection_type, current_user)
+    @issuable_meta_data = Gitlab::IssuableMetadata.new(current_user, @issues).data
 
     respond_to do |format|
       format.html
@@ -22,7 +22,7 @@ module IssuableCollectionsAction
   def merge_requests
     @merge_requests = issuables_collection.page(params[:page])
 
-    @issuable_meta_data = issuable_meta_data(@merge_requests, collection_type, current_user)
+    @issuable_meta_data = Gitlab::IssuableMetadata.new(current_user, @merge_requests).data
   end
   # rubocop:enable Gitlab/ModuleWithInstanceVariables
 
diff --git a/app/controllers/projects_controller.rb b/app/controllers/projects_controller.rb
index ff292973546..3597a0f307a 100644
--- a/app/controllers/projects_controller.rb
+++ b/app/controllers/projects_controller.rb
@@ -314,8 +314,7 @@ class ProjectsController < Projects::ApplicationController
         @wiki_home = @project_wiki.find_page('home', params[:version_id])
       elsif @project.feature_available?(:issues, current_user)
         @issues = issuables_collection.page(params[:page])
-        @collection_type = 'Issue'
-        @issuable_meta_data = issuable_meta_data(@issues, @collection_type, current_user)
+        @issuable_meta_data = Gitlab::IssuableMetadata.new(current_user, @issues).data
       end
 
       render :show
diff --git a/app/models/ci/runner.rb b/app/models/ci/runner.rb
index 30ea383bd73..6f12ec921d4 100644
--- a/app/models/ci/runner.rb
+++ b/app/models/ci/runner.rb
@@ -23,10 +23,17 @@ module Ci
       project_type: 3
     }
 
-    ONLINE_CONTACT_TIMEOUT = 1.hour
+    # This `ONLINE_CONTACT_TIMEOUT` needs to be larger than
+    #   `RUNNER_QUEUE_EXPIRY_TIME+UPDATE_CONTACT_COLUMN_EVERY`
+    #
+    ONLINE_CONTACT_TIMEOUT = 2.hours
+
+    # The `RUNNER_QUEUE_EXPIRY_TIME` indicates the longest interval that
+    #   Runner request needs to be refreshed by Rails instead of being handled
+    #   by Workhorse
     RUNNER_QUEUE_EXPIRY_TIME = 1.hour
 
-    # This needs to be less than `ONLINE_CONTACT_TIMEOUT`
+    # The `UPDATE_CONTACT_COLUMN_EVERY` defines how often the Runner DB entry can be updated
     UPDATE_CONTACT_COLUMN_EVERY = (40.minutes..55.minutes).freeze
 
     AVAILABLE_TYPES_LEGACY = %w[specific shared].freeze
@@ -282,7 +289,7 @@ module Ci
       ensure_runner_queue_value == value if value.present?
     end
 
-    def update_cached_info(values)
+    def heartbeat(values)
       values = values&.slice(:version, :revision, :platform, :architecture, :ip_address) || {}
       values[:contacted_at] = Time.current
 
diff --git a/app/models/commit_status.rb b/app/models/commit_status.rb
index 5622a53bb5d..b202a6579e7 100644
--- a/app/models/commit_status.rb
+++ b/app/models/commit_status.rb
@@ -189,8 +189,10 @@ class CommitStatus < ApplicationRecord
   end
 
   def self.update_as_processed!
-    # Marks items as processed, and increases `lock_version` (Optimisitc Locking)
-    update_all('processed=TRUE, lock_version=COALESCE(lock_version,0)+1')
+    # Marks items as processed
+    # we do not increase `lock_version`, as we are the one
+    # holding given lock_version (Optimisitc Locking)
+    update_all(processed: true)
   end
 
   def self.locking_enabled?
diff --git a/app/models/concerns/issuable.rb b/app/models/concerns/issuable.rb
index f011426c9db..92d89ad9092 100644
--- a/app/models/concerns/issuable.rb
+++ b/app/models/concerns/issuable.rb
@@ -39,15 +39,6 @@ module Issuable
     locked: 4
   }.with_indifferent_access.freeze
 
-  # This object is used to gather issuable meta data for displaying
-  # upvotes, downvotes, notes and closing merge requests count for issues and merge requests
-  # lists avoiding n+1 queries and improving performance.
-  IssuableMeta = Struct.new(:upvotes, :downvotes, :user_notes_count, :mrs_count) do
-    def merge_requests_count(user = nil)
-      mrs_count
-    end
-  end
-
   included do
     cache_markdown_field :title, pipeline: :single_line
     cache_markdown_field :description, issuable_state_filter_enabled: true
diff --git a/app/services/projects/update_pages_service.rb b/app/services/projects/update_pages_service.rb
index 7bebaca684a..59389a0fa65 100644
--- a/app/services/projects/update_pages_service.rb
+++ b/app/services/projects/update_pages_service.rb
@@ -2,8 +2,6 @@
 
 module Projects
   class UpdatePagesService < BaseService
-    include Gitlab::OptimisticLocking
-
     InvalidStateError = Class.new(StandardError)
     FailedToExtractError = Class.new(StandardError)
 
@@ -25,8 +23,8 @@ module Projects
 
       # Create status notifying the deployment of pages
       @status = create_status
-      retry_optimistic_lock(@status, &:enqueue!)
-      retry_optimistic_lock(@status, &:run!)
+      @status.enqueue!
+      @status.run!
 
       raise InvalidStateError, 'missing pages artifacts' unless build.artifacts?
       raise InvalidStateError, 'build SHA is outdated for this ref' unless latest?
@@ -53,7 +51,7 @@ module Projects
     private
 
     def success
-      retry_optimistic_lock(@status, &:success)
+      @status.success
       @project.mark_pages_as_deployed
       super
     end
@@ -63,7 +61,7 @@ module Projects
       log_error("Projects::UpdatePagesService: #{message}")
       @status.allow_failure = !latest?
       @status.description = message
-      retry_optimistic_lock(@status) { |status| status.drop(:script_failure) }
+      @status.drop(:script_failure)
       super
     end
 
diff --git a/changelogs/unreleased/196544-nodemetrics-size.yml b/changelogs/unreleased/196544-nodemetrics-size.yml
new file mode 100644
index 00000000000..1319ef2f624
--- /dev/null
+++ b/changelogs/unreleased/196544-nodemetrics-size.yml
@@ -0,0 +1,5 @@
+---
+title: Added node size to cluster index
+merge_request: 32435
+author:
+type: changed
diff --git a/changelogs/unreleased/219145-comment-button-does-not-show-up-on-mr-when-comments-are-set-to-new.yml b/changelogs/unreleased/219145-comment-button-does-not-show-up-on-mr-when-comments-are-set-to-new.yml
new file mode 100644
index 00000000000..232842c3c5a
--- /dev/null
+++ b/changelogs/unreleased/219145-comment-button-does-not-show-up-on-mr-when-comments-are-set-to-new.yml
@@ -0,0 +1,5 @@
+---
+title: Fix overflow issue in MR and Issue comments
+merge_request: 33100
+author:
+type: fixed
diff --git a/changelogs/unreleased/fix-atomic-processing-lock-version.yml b/changelogs/unreleased/fix-atomic-processing-lock-version.yml
new file mode 100644
index 00000000000..9db891d651f
--- /dev/null
+++ b/changelogs/unreleased/fix-atomic-processing-lock-version.yml
@@ -0,0 +1,5 @@
+---
+title: Fix atomic processing bumping a lock_version
+merge_request: 32914
+author:
+type: fixed
diff --git a/changelogs/unreleased/fix-runner-hearbeat.yml b/changelogs/unreleased/fix-runner-hearbeat.yml
new file mode 100644
index 00000000000..8125bad48ab
--- /dev/null
+++ b/changelogs/unreleased/fix-runner-hearbeat.yml
@@ -0,0 +1,5 @@
+---
+title: Fix Runner heartbeats that results in considering them offline
+merge_request: 32851
+author:
+type: fixed
diff --git a/changelogs/unreleased/iterations_add_daterange_constraint.yml b/changelogs/unreleased/iterations_add_daterange_constraint.yml
deleted file mode 100644
index bbc46cbe1e7..00000000000
--- a/changelogs/unreleased/iterations_add_daterange_constraint.yml
+++ /dev/null
@@ -1,5 +0,0 @@
----
-title: Add btree_gist PGSQL extension and add DB constraints for Iteration date ranges
-merge_request: 32335
-author:
-type: added
diff --git a/db/migrate/20200515152649_enable_btree_gist_extension.rb b/db/migrate/20200515152649_enable_btree_gist_extension.rb
deleted file mode 100644
index 686b685fb5d..00000000000
--- a/db/migrate/20200515152649_enable_btree_gist_extension.rb
+++ /dev/null
@@ -1,13 +0,0 @@
-# frozen_string_literal: true
-
-class EnableBtreeGistExtension < ActiveRecord::Migration[6.0]
-  DOWNTIME = false
-
-  def up
-    execute 'CREATE EXTENSION IF NOT EXISTS btree_gist'
-  end
-
-  def down
-    execute 'DROP EXTENSION IF EXISTS btree_gist'
-  end
-end
diff --git a/db/migrate/20200515153633_iteration_date_range_constraint.rb b/db/migrate/20200515153633_iteration_date_range_constraint.rb
deleted file mode 100644
index ab197ff8ae7..00000000000
--- a/db/migrate/20200515153633_iteration_date_range_constraint.rb
+++ /dev/null
@@ -1,39 +0,0 @@
-# frozen_string_literal: true
-
-class IterationDateRangeConstraint < ActiveRecord::Migration[6.0]
-  DOWNTIME = false
-
-  def up
-    execute <<~SQL
-      ALTER TABLE sprints
-        ADD CONSTRAINT iteration_start_and_due_daterange_project_id_constraint
-        EXCLUDE USING gist
-        ( project_id WITH =,
-          daterange(start_date, due_date, '[]') WITH &&
-        )
-        WHERE (project_id IS NOT NULL)
-    SQL
-
-    execute <<~SQL
-      ALTER TABLE sprints
-        ADD CONSTRAINT iteration_start_and_due_daterange_group_id_constraint
-        EXCLUDE USING gist
-        ( group_id WITH =,
-          daterange(start_date, due_date, '[]') WITH &&
-        )
-        WHERE (group_id IS NOT NULL)
-    SQL
-  end
-
-  def down
-    execute <<~SQL
-      ALTER TABLE sprints
-        DROP CONSTRAINT IF EXISTS iteration_start_and_due_daterange_project_id_constraint
-    SQL
-
-    execute <<~SQL
-      ALTER TABLE sprints
-        DROP CONSTRAINT IF EXISTS iteration_start_and_due_daterange_group_id_constraint
-    SQL
-  end
-end
diff --git a/db/structure.sql b/db/structure.sql
index 386296a53c4..e30b51c576c 100644
--- a/db/structure.sql
+++ b/db/structure.sql
@@ -2,8 +2,6 @@ SET search_path=public;
 
 CREATE EXTENSION IF NOT EXISTS plpgsql WITH SCHEMA pg_catalog;
 
-CREATE EXTENSION IF NOT EXISTS btree_gist WITH SCHEMA public;
-
 CREATE EXTENSION IF NOT EXISTS pg_trgm WITH SCHEMA public;
 
 CREATE TABLE public.abuse_reports (
@@ -8427,12 +8425,6 @@ ALTER TABLE ONLY public.issue_user_mentions
 ALTER TABLE ONLY public.issues
     ADD CONSTRAINT issues_pkey PRIMARY KEY (id);
 
-ALTER TABLE ONLY public.sprints
-    ADD CONSTRAINT iteration_start_and_due_daterange_group_id_constraint EXCLUDE USING gist (group_id WITH =, daterange(start_date, due_date, '[]'::text) WITH &&) WHERE ((group_id IS NOT NULL));
-
-ALTER TABLE ONLY public.sprints
-    ADD CONSTRAINT iteration_start_and_due_daterange_project_id_constraint EXCLUDE USING gist (project_id WITH =, daterange(start_date, due_date, '[]'::text) WITH &&) WHERE ((project_id IS NOT NULL));
-
 ALTER TABLE ONLY public.jira_connect_installations
     ADD CONSTRAINT jira_connect_installations_pkey PRIMARY KEY (id);
 
@@ -13953,8 +13945,6 @@ COPY "schema_migrations" (version) FROM STDIN;
 20200514000009
 20200514000132
 20200514000340
-20200515152649
-20200515153633
 20200515155620
 20200519115908
 20200519171058
diff --git a/doc/development/migration_style_guide.md b/doc/development/migration_style_guide.md
index 32ea461f4e9..4e10f1657b7 100644
--- a/doc/development/migration_style_guide.md
+++ b/doc/development/migration_style_guide.md
@@ -367,6 +367,8 @@ migration involves one of the high-traffic tables:
 - `users`
 - `projects`
 - `namespaces`
+- `issues`
+- `merge_requests`
 - `ci_pipelines`
 - `ci_builds`
 - `notes`
diff --git a/doc/install/aws/index.md b/doc/install/aws/index.md
index e7fbe392726..18e1d34f9ca 100644
--- a/doc/install/aws/index.md
+++ b/doc/install/aws/index.md
@@ -59,8 +59,6 @@ Here's a list of the AWS services we will use, with links to pricing information
   Redis configuration. See the
   [Amazon ElastiCache pricing](https://aws.amazon.com/elasticache/pricing/).
 
-NOTE: **Note:** Please note that while we will be using EBS for storage, we do not recommend using EFS as it may negatively impact GitLab's performance. You can review the [relevant documentation](../../administration/high_availability/nfs.md#avoid-using-awss-elastic-file-system-efs) for more details.
-
 ## Create an IAM EC2 instance role and profile
 
 As we'll be using [Amazon S3 object storage](#amazon-s3-object-storage), our EC2 instances need to have read, write, and list permissions for our S3 buckets. To avoid embedding AWS keys in our GitLab config, we'll make use of an [IAM Role](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles.html) to allow our GitLab instance with this access. We'll need to create an IAM policy to attach to our IAM role:
@@ -563,7 +561,7 @@ Let's create an EC2 instance where we'll install Gitaly:
 1. Click **Review and launch** followed by **Launch** if you're happy with your settings.
 1. Finally, acknowledge that you have access to the selected private key file or create a new one. Click **Launch Instances**.
 
-  > **Optional:** Instead of storing configuration _and_ repository data on the root volume, you can also choose to add an additional EBS volume for repository storage. Follow the same guidance as above. See the [Amazon EBS pricing](https://aws.amazon.com/ebs/pricing/).
+NOTE: **Optional:** Instead of storing configuration _and_ repository data on the root volume, you can also choose to add an additional EBS volume for repository storage. Follow the same guidance as above. See the [Amazon EBS pricing](https://aws.amazon.com/ebs/pricing/). We do not recommend using EFS as it may negatively impact GitLab’s performance. You can review the [relevant documentation](../../administration/high_availability/nfs.md#avoid-using-awss-elastic-file-system-efs) for more details.
 
 Now that we have our EC2 instance ready, follow the [documentation to install GitLab and set up Gitaly on its own server](../../administration/gitaly/index.md#running-gitaly-on-its-own-server). Perform the client setup steps from that document on the [GitLab instance we created](#install-gitlab) above.
 
diff --git a/doc/user/gitlab_com/index.md b/doc/user/gitlab_com/index.md
index 42c4671a47c..9bacfcafbc6 100644
--- a/doc/user/gitlab_com/index.md
+++ b/doc/user/gitlab_com/index.md
@@ -563,6 +563,10 @@ If more than the maximum number of allowed connections occur concurrently, they
 dropped and users get
 [an `ssh_exchange_identification` error](../../topics/git/troubleshooting_git.md#ssh_exchange_identification-error).
 
+### Import/export
+
+To help avoid abuse, project and group imports, exports, and export downloads are rate limited. See [Project import/export rate limits](../../user/project/settings/import_export.md#rate-limits) and [Group import/export rate limits](../../user/group/settings/import_export.md#rate-limits) for details.
+
 ## GitLab.com Logging
 
 We use [Fluentd](https://gitlab.com/gitlab-com/runbooks/tree/master/logging/doc#fluentd) to parse our logs. Fluentd sends our logs to
diff --git a/lib/api/commit_statuses.rb b/lib/api/commit_statuses.rb
index fd09e2d4ee6..b4c5d7869a2 100644
--- a/lib/api/commit_statuses.rb
+++ b/lib/api/commit_statuses.rb
@@ -106,7 +106,7 @@ module API
             status.enqueue!
           when 'running'
             status.enqueue
-            Gitlab::OptimisticLocking.retry_lock(status, &:run!)
+            status.run!
           when 'success'
             status.success!
           when 'failed'
diff --git a/lib/api/helpers/runner.rb b/lib/api/helpers/runner.rb
index 1f1253c8542..293d7ed9a6a 100644
--- a/lib/api/helpers/runner.rb
+++ b/lib/api/helpers/runner.rb
@@ -3,6 +3,8 @@
 module API
   module Helpers
     module Runner
+      include Gitlab::Utils::StrongMemoize
+
       prepend_if_ee('EE::API::Helpers::Runner') # rubocop: disable Cop/InjectEnterpriseEditionModule
 
       JOB_TOKEN_HEADER = 'HTTP_JOB_TOKEN'
@@ -16,7 +18,7 @@ module API
         forbidden! unless current_runner
 
         current_runner
-          .update_cached_info(get_runner_details_from_request)
+          .heartbeat(get_runner_details_from_request)
       end
 
       def get_runner_details_from_request
@@ -31,31 +33,35 @@ module API
       end
 
       def current_runner
-        @runner ||= ::Ci::Runner.find_by_token(params[:token].to_s)
+        strong_memoize(:current_runner) do
+          ::Ci::Runner.find_by_token(params[:token].to_s)
+        end
       end
 
-      def validate_job!(job)
-        not_found! unless job
-
-        yield if block_given?
-
-        project = job.project
-        forbidden!('Project has been deleted!') if project.nil? || project.pending_delete?
-        forbidden!('Job has been erased!') if job.erased?
-      end
-
-      def authenticate_job!
+      def authenticate_job!(require_running: true)
         job = current_job
 
-        validate_job!(job) do
-          forbidden! unless job_token_valid?(job)
+        not_found! unless job
+        forbidden! unless job_token_valid?(job)
+
+        forbidden!('Project has been deleted!') if job.project.nil? || job.project.pending_delete?
+        forbidden!('Job has been erased!') if job.erased?
+
+        if require_running
+          job_forbidden!(job, 'Job is not running') unless job.running?
+        end
+
+        if Gitlab::Ci::Features.job_heartbeats_runner?(job.project)
+          job.runner&.heartbeat(get_runner_ip)
         end
 
         job
       end
 
       def current_job
-        @current_job ||= Ci::Build.find_by_id(params[:id])
+        strong_memoize(:current_job) do
+          Ci::Build.find_by_id(params[:id])
+        end
       end
 
       def job_token_valid?(job)
diff --git a/lib/api/issues.rb b/lib/api/issues.rb
index de2d0b01a64..2374ac11f4a 100644
--- a/lib/api/issues.rb
+++ b/lib/api/issues.rb
@@ -5,7 +5,6 @@ module API
     include PaginationParams
     helpers Helpers::IssuesHelpers
     helpers Helpers::RateLimiter
-    helpers ::Gitlab::IssuableMetadata
 
     before { authenticate_non_get! }
 
@@ -108,7 +107,7 @@ module API
           with: Entities::Issue,
           with_labels_details: declared_params[:with_labels_details],
           current_user: current_user,
-          issuable_metadata: issuable_meta_data(issues, 'Issue', current_user),
+          issuable_metadata: Gitlab::IssuableMetadata.new(current_user, issues).data,
           include_subscribed: false
         }
 
@@ -134,7 +133,7 @@ module API
           with: Entities::Issue,
           with_labels_details: declared_params[:with_labels_details],
           current_user: current_user,
-          issuable_metadata: issuable_meta_data(issues, 'Issue', current_user),
+          issuable_metadata: Gitlab::IssuableMetadata.new(current_user, issues).data,
           include_subscribed: false,
           group: user_group
         }
@@ -171,7 +170,7 @@ module API
           with_labels_details: declared_params[:with_labels_details],
           current_user: current_user,
           project: user_project,
-          issuable_metadata: issuable_meta_data(issues, 'Issue', current_user),
+          issuable_metadata: Gitlab::IssuableMetadata.new(current_user, issues).data,
           include_subscribed: false
         }
 
diff --git a/lib/api/merge_requests.rb b/lib/api/merge_requests.rb
index ff4ad85115b..32e4059f054 100644
--- a/lib/api/merge_requests.rb
+++ b/lib/api/merge_requests.rb
@@ -8,7 +8,6 @@ module API
 
     before { authenticate_non_get! }
 
-    helpers ::Gitlab::IssuableMetadata
     helpers Helpers::MergeRequestsHelpers
 
     # EE::API::MergeRequests would override the following helpers
@@ -92,7 +91,7 @@ module API
         if params[:view] == 'simple'
           options[:with] = Entities::MergeRequestSimple
         else
-          options[:issuable_metadata] = issuable_meta_data(merge_requests, 'MergeRequest', current_user)
+          options[:issuable_metadata] = Gitlab::IssuableMetadata.new(current_user, merge_requests).data
           if Feature.enabled?(:mr_list_api_skip_merge_status_recheck, default_enabled: true)
             options[:skip_merge_status_recheck] = !declared_params[:with_merge_status_recheck]
           end
diff --git a/lib/api/runner.rb b/lib/api/runner.rb
index e070e57a376..5f08ebe4a06 100644
--- a/lib/api/runner.rb
+++ b/lib/api/runner.rb
@@ -154,7 +154,6 @@ module API
       end
       put '/:id' do
         job = authenticate_job!
-        job_forbidden!(job, 'Job is not running') unless job.running?
 
         job.trace.set(params[:trace]) if params[:trace]
 
@@ -182,7 +181,6 @@ module API
       end
       patch '/:id/trace' do
         job = authenticate_job!
-        job_forbidden!(job, 'Job is not running') unless job.running?
 
         error!('400 Missing header Content-Range', 400) unless request.headers.key?('Content-Range')
         content_range = request.headers['Content-Range']
@@ -229,7 +227,6 @@ module API
         Gitlab::Workhorse.verify_api_request!(headers)
 
         job = authenticate_job!
-        forbidden!('Job is not running') unless job.running?
 
         service = Ci::AuthorizeJobArtifactService.new(job, params, max_size: max_artifacts_size(job))
 
@@ -265,7 +262,6 @@ module API
         require_gitlab_workhorse!
 
         job = authenticate_job!
-        forbidden!('Job is not running!') unless job.running?
 
         artifacts = params[:file]
         metadata = params[:metadata]
@@ -292,7 +288,7 @@ module API
         optional :direct_download, default: false, type: Boolean, desc: %q(Perform direct download from remote storage instead of proxying artifacts)
       end
       get '/:id/artifacts' do
-        job = authenticate_job!
+        job = authenticate_job!(require_running: false)
 
         present_carrierwave_file!(job.artifacts_file, supports_direct_download: params[:direct_download])
       end
diff --git a/lib/api/todos.rb b/lib/api/todos.rb
index 02b8bb55274..43ed9c96486 100644
--- a/lib/api/todos.rb
+++ b/lib/api/todos.rb
@@ -6,8 +6,6 @@ module API
 
     before { authenticate! }
 
-    helpers ::Gitlab::IssuableMetadata
-
     ISSUABLE_TYPES = {
       'merge_requests' => ->(iid) { find_merge_request_with_access(iid) },
       'issues' => ->(iid) { find_project_issue(iid) }
@@ -65,7 +63,7 @@ module API
             next unless collection
 
             targets = collection.map(&:target)
-            options[type] = { issuable_metadata: issuable_meta_data(targets, type, current_user) }
+            options[type] = { issuable_metadata: Gitlab::IssuableMetadata.new(current_user, targets).data }
           end
         end
       end
diff --git a/lib/gitlab/ci/features.rb b/lib/gitlab/ci/features.rb
index 48f3d4fdd2f..06db38d1d7b 100644
--- a/lib/gitlab/ci/features.rb
+++ b/lib/gitlab/ci/features.rb
@@ -13,6 +13,10 @@ module Gitlab
       def self.ensure_scheduling_type_enabled?
         ::Feature.enabled?(:ci_ensure_scheduling_type, default_enabled: true)
       end
+
+      def self.job_heartbeats_runner?(project)
+        ::Feature.enabled?(:ci_job_heartbeats_runner, project, default_enabled: true)
+      end
     end
   end
 end
diff --git a/lib/gitlab/issuable_metadata.rb b/lib/gitlab/issuable_metadata.rb
index 6f760751b0f..e946fc00c4d 100644
--- a/lib/gitlab/issuable_metadata.rb
+++ b/lib/gitlab/issuable_metadata.rb
@@ -1,8 +1,52 @@
 # frozen_string_literal: true
 
 module Gitlab
-  module IssuableMetadata
-    def issuable_meta_data(issuable_collection, collection_type, user = nil)
+  class IssuableMetadata
+    include Gitlab::Utils::StrongMemoize
+
+    # data structure to store issuable meta data like
+    # upvotes, downvotes, notes and closing merge requests counts for issues and merge requests
+    # this avoiding n+1 queries when loading issuable collections on frontend
+    IssuableMeta = Struct.new(:upvotes, :downvotes, :user_notes_count, :mrs_count) do
+      def merge_requests_count(user = nil)
+        mrs_count
+      end
+    end
+
+    attr_reader :current_user, :issuable_collection
+
+    def initialize(current_user, issuable_collection)
+      @current_user = current_user
+      @issuable_collection = issuable_collection
+
+      validate_collection!
+    end
+
+    def data
+      return {} if issuable_ids.empty?
+
+      issuable_ids.each_with_object({}) do |id, issuable_meta|
+        issuable_meta[id] = metadata_for_issuable(id)
+      end
+    end
+
+    private
+
+    def metadata_for_issuable(id)
+      downvotes = group_issuable_votes_count.find { |votes| votes.awardable_id == id && votes.downvote? }
+      upvotes = group_issuable_votes_count.find { |votes| votes.awardable_id == id && votes.upvote? }
+      notes = grouped_issuable_notes_count.find { |notes| notes.noteable_id == id }
+      merge_requests = grouped_issuable_merge_requests_count.find { |mr| mr.first == id }
+
+      IssuableMeta.new(
+        upvotes.try(:count).to_i,
+        downvotes.try(:count).to_i,
+        notes.try(:count).to_i,
+        merge_requests.try(:last).to_i
+      )
+    end
+
+    def validate_collection!
       # ActiveRecord uses Object#extend for null relations.
       if !(issuable_collection.singleton_class < ActiveRecord::NullRelation) &&
           issuable_collection.respond_to?(:limit_value) &&
@@ -10,36 +54,43 @@ module Gitlab
 
         raise 'Collection must have a limit applied for preloading meta-data'
       end
+    end
 
-      # map has to be used here since using pluck or select will
-      # throw an error when ordering issuables by priority which inserts
-      # a new order into the collection.
-      # We cannot use reorder to not mess up the paginated collection.
-      issuable_ids = issuable_collection.map(&:id)
+    def issuable_ids
+      strong_memoize(:issuable_ids) do
+        # map has to be used here since using pluck or select will
+        # throw an error when ordering issuables by priority which inserts
+        # a new order into the collection.
+        # We cannot use reorder to not mess up the paginated collection.
+        issuable_collection.map(&:id)
+      end
+    end
 
-      return {} if issuable_ids.empty?
+    def collection_type
+      # Supports relations or paginated arrays
+      issuable_collection.try(:model)&.name ||
+        issuable_collection.first&.model_name.to_s
+    end
 
-      issuable_notes_count = ::Note.count_for_collection(issuable_ids, collection_type)
-      issuable_votes_count = ::AwardEmoji.votes_for_collection(issuable_ids, collection_type)
-      issuable_merge_requests_count =
+    def group_issuable_votes_count
+      strong_memoize(:group_issuable_votes_count) do
+        AwardEmoji.votes_for_collection(issuable_ids, collection_type)
+      end
+    end
+
+    def grouped_issuable_notes_count
+      strong_memoize(:grouped_issuable_notes_count) do
+        ::Note.count_for_collection(issuable_ids, collection_type)
+      end
+    end
+
+    def grouped_issuable_merge_requests_count
+      strong_memoize(:grouped_issuable_merge_requests_count) do
         if collection_type == 'Issue'
-          ::MergeRequestsClosingIssues.count_for_collection(issuable_ids, user)
+          ::MergeRequestsClosingIssues.count_for_collection(issuable_ids, current_user)
         else
           []
         end
-
-      issuable_ids.each_with_object({}) do |id, issuable_meta|
-        downvotes = issuable_votes_count.find { |votes| votes.awardable_id == id && votes.downvote? }
-        upvotes = issuable_votes_count.find { |votes| votes.awardable_id == id && votes.upvote? }
-        notes = issuable_notes_count.find { |notes| notes.noteable_id == id }
-        merge_requests = issuable_merge_requests_count.find { |mr| mr.first == id }
-
-        issuable_meta[id] = ::Issuable::IssuableMeta.new(
-          upvotes.try(:count).to_i,
-          downvotes.try(:count).to_i,
-          notes.try(:count).to_i,
-          merge_requests.try(:last).to_i
-        )
       end
     end
   end
diff --git a/locale/gitlab.pot b/locale/gitlab.pot
index 6fb263e7b0a..cdd98ff85a8 100644
--- a/locale/gitlab.pot
+++ b/locale/gitlab.pot
@@ -2231,9 +2231,6 @@ msgstr ""
 msgid "An error occurred while loading chart data"
 msgstr ""
 
-msgid "An error occurred while loading clusters"
-msgstr ""
-
 msgid "An error occurred while loading commit signatures"
 msgstr ""
 
@@ -5429,6 +5426,9 @@ msgstr ""
 msgid "ClusterIntergation|Select service role"
 msgstr ""
 
+msgid "Clusters|An error occurred while loading clusters"
+msgstr ""
+
 msgid "Code"
 msgstr ""
 
diff --git a/package.json b/package.json
index 771584d5499..6dda80eb8da 100644
--- a/package.json
+++ b/package.json
@@ -41,7 +41,7 @@
     "@babel/preset-env": "^7.8.4",
     "@gitlab/at.js": "1.5.5",
     "@gitlab/svgs": "1.130.0",
-    "@gitlab/ui": "16.0",
+    "@gitlab/ui": "16.0.0",
     "@gitlab/visual-review-tools": "1.6.1",
     "@rails/actioncable": "^6.0.3",
     "@sentry/browser": "^5.10.2",
diff --git a/spec/controllers/admin/clusters_controller_spec.rb b/spec/controllers/admin/clusters_controller_spec.rb
index d4a12e0dc52..fc1328c887a 100644
--- a/spec/controllers/admin/clusters_controller_spec.rb
+++ b/spec/controllers/admin/clusters_controller_spec.rb
@@ -42,6 +42,13 @@ describe Admin::ClustersController do
           expect(response).to match_response_schema('cluster_list')
         end
 
+        it 'sets the polling interval header for json requests' do
+          get_index(format: :json)
+
+          expect(response).to have_gitlab_http_status(:ok)
+          expect(response.headers['Poll-Interval']).to eq("10000")
+        end
+
         context 'when page is specified' do
           let(:last_page) { Clusters::Cluster.instance_type.page.total_pages }
           let(:total_count) { Clusters::Cluster.instance_type.page.total_count }
diff --git a/spec/controllers/groups/clusters_controller_spec.rb b/spec/controllers/groups/clusters_controller_spec.rb
index 1f2f6bd811b..57a6db54338 100644
--- a/spec/controllers/groups/clusters_controller_spec.rb
+++ b/spec/controllers/groups/clusters_controller_spec.rb
@@ -47,6 +47,13 @@ describe Groups::ClustersController do
           expect(response).to match_response_schema('cluster_list')
         end
 
+        it 'sets the polling interval header for json requests' do
+          go(format: :json)
+
+          expect(response).to have_gitlab_http_status(:ok)
+          expect(response.headers['Poll-Interval']).to eq("10000")
+        end
+
         context 'when page is specified' do
           let(:last_page) { group.clusters.page.total_pages }
           let(:total_count) { group.clusters.page.total_count }
diff --git a/spec/controllers/projects/clusters_controller_spec.rb b/spec/controllers/projects/clusters_controller_spec.rb
index 698a3773d59..262a4956ce5 100644
--- a/spec/controllers/projects/clusters_controller_spec.rb
+++ b/spec/controllers/projects/clusters_controller_spec.rb
@@ -41,6 +41,13 @@ describe Projects::ClustersController do
           expect(response).to match_response_schema('cluster_list')
         end
 
+        it 'sets the polling interval header for json requests' do
+          go(format: :json)
+
+          expect(response).to have_gitlab_http_status(:ok)
+          expect(response.headers['Poll-Interval']).to eq("10000")
+        end
+
         context 'when page is specified' do
           let(:last_page) { project.clusters.page.total_pages }
           let(:total_count) { project.clusters.page.total_count }
diff --git a/spec/features/issues/move_spec.rb b/spec/features/issues/move_spec.rb
index 7dad5565856..831bcf8931e 100644
--- a/spec/features/issues/move_spec.rb
+++ b/spec/features/issues/move_spec.rb
@@ -95,45 +95,6 @@ describe 'issue move to another project' do
         expect(page).to have_no_selector('#move_to_project_id')
       end
     end
-
-    context 'service desk issue moved to a project with service desk disabled', :js do
-      let(:project_title) { 'service desk disabled project' }
-      let(:warning_selector) { '.js-alert-moved-from-service-desk-warning' }
-      let(:namespace) { create(:namespace) }
-      let(:regular_project) { create(:project, title: project_title, service_desk_enabled: false) }
-      let(:service_desk_project) { build(:project, :private, namespace: namespace, service_desk_enabled: true) }
-      let(:service_desk_issue) { create(:issue, project: service_desk_project, author: ::User.support_bot) }
-
-      before do
-        allow(::Gitlab).to receive(:com?).and_return(true)
-        allow(::Gitlab::IncomingEmail).to receive(:enabled?).and_return(true)
-        allow(::Gitlab::IncomingEmail).to receive(:supports_wildcard?).and_return(true)
-
-        regular_project.add_reporter(user)
-        service_desk_project.add_reporter(user)
-
-        visit issue_path(service_desk_issue)
-
-        find('.js-move-issue').click
-        wait_for_requests
-        find('.js-move-issue-dropdown-item', text: project_title).click
-        find('.js-move-issue-confirmation-button').click
-      end
-
-      it 'shows an alert after being moved' do
-        expect(page).to have_content('This project does not have Service Desk enabled')
-      end
-
-      it 'does not show an alert after being dismissed' do
-        find("#{warning_selector} .js-close").click
-
-        expect(page).to have_no_selector(warning_selector)
-
-        page.refresh
-
-        expect(page).to have_no_selector(warning_selector)
-      end
-    end
   end
 
   def issue_path(issue)
diff --git a/spec/frontend/clusters_list/components/clusters_spec.js b/spec/frontend/clusters_list/components/clusters_spec.js
index e2d2e4b73b3..4ca2ccba385 100644
--- a/spec/frontend/clusters_list/components/clusters_spec.js
+++ b/spec/frontend/clusters_list/components/clusters_spec.js
@@ -28,13 +28,17 @@ describe('Clusters', () => {
     return axios.waitForAll();
   };
 
+  const paginationHeader = (total = apiData.clusters.length, perPage = 20, currentPage = 1) => {
+    return {
+      'x-total': total,
+      'x-per-page': perPage,
+      'x-page': currentPage,
+    };
+  };
+
   beforeEach(() => {
     mock = new MockAdapter(axios);
-    mockPollingApi(200, apiData, {
-      'x-total': apiData.clusters.length,
-      'x-per-page': 20,
-      'x-page': 1,
-    });
+    mockPollingApi(200, apiData, paginationHeader());
 
     return mountWrapper();
   });
@@ -99,17 +103,30 @@ describe('Clusters', () => {
     });
   });
 
+  describe('nodes present', () => {
+    it.each`
+      nodeSize     | lineNumber
+      ${'Unknown'} | ${0}
+      ${'1'}       | ${1}
+      ${'2'}       | ${2}
+      ${'Unknown'} | ${3}
+      ${'Unknown'} | ${4}
+      ${'Unknown'} | ${5}
+    `('renders node size for each cluster', ({ nodeSize, lineNumber }) => {
+      const sizes = findTable().findAll('td:nth-child(3)');
+      const size = sizes.at(lineNumber);
+
+      expect(size.text()).toBe(nodeSize);
+    });
+  });
+
   describe('pagination', () => {
     const perPage = apiData.clusters.length;
     const totalFirstPage = 100;
     const totalSecondPage = 500;
 
     beforeEach(() => {
-      mockPollingApi(200, apiData, {
-        'x-total': totalFirstPage,
-        'x-per-page': perPage,
-        'x-page': 1,
-      });
+      mockPollingApi(200, apiData, paginationHeader(totalFirstPage, perPage, 1));
       return mountWrapper();
     });
 
@@ -123,11 +140,7 @@ describe('Clusters', () => {
 
     describe('when updating currentPage', () => {
       beforeEach(() => {
-        mockPollingApi(200, apiData, {
-          'x-total': totalSecondPage,
-          'x-per-page': perPage,
-          'x-page': 2,
-        });
+        mockPollingApi(200, apiData, paginationHeader(totalSecondPage, perPage, 2));
         wrapper.setData({ currentPage: 2 });
         return axios.waitForAll();
       });
diff --git a/spec/frontend/clusters_list/mock_data.js b/spec/frontend/clusters_list/mock_data.js
index 9a90a378f31..893061f86e8 100644
--- a/spec/frontend/clusters_list/mock_data.js
+++ b/spec/frontend/clusters_list/mock_data.js
@@ -1,57 +1,45 @@
 export const clusterList = [
   {
     name: 'My Cluster 1',
-    environmentScope: '*',
-    size: '3',
-    clusterType: 'group_type',
+    environment_scope: '*',
+    cluster_type: 'group_type',
     status: 'disabled',
-    cpu: '6 (100% free)',
-    memory: '22.50 (30% free)',
+    nodes: null,
   },
   {
     name: 'My Cluster 2',
-    environmentScope: 'development',
-    size: '12',
-    clusterType: 'project_type',
+    environment_scope: 'development',
+    cluster_type: 'project_type',
     status: 'unreachable',
-    cpu: '3 (50% free)',
-    memory: '11 (60% free)',
+    nodes: [{ usage: { cpu: '246155922n', memory: '1255212Ki' } }],
   },
   {
     name: 'My Cluster 3',
-    environmentScope: 'development',
-    size: '12',
-    clusterType: 'project_type',
+    environment_scope: 'development',
+    cluster_type: 'project_type',
     status: 'authentication_failure',
-    cpu: '1 (0% free)',
-    memory: '22 (33% free)',
+    nodes: [
+      { usage: { cpu: '246155922n', memory: '1255212Ki' } },
+      { usage: { cpu: '307051934n', memory: '1379136Ki' } },
+    ],
   },
   {
     name: 'My Cluster 4',
-    environmentScope: 'production',
-    size: '12',
-    clusterType: 'project_type',
+    environment_scope: 'production',
+    cluster_type: 'project_type',
     status: 'deleting',
-    cpu: '6 (100% free)',
-    memory: '45 (15% free)',
   },
   {
     name: 'My Cluster 5',
-    environmentScope: 'development',
-    size: '12',
-    clusterType: 'project_type',
+    environment_scope: 'development',
+    cluster_type: 'project_type',
     status: 'created',
-    cpu: '6 (100% free)',
-    memory: '20.12 (35% free)',
   },
   {
     name: 'My Cluster 6',
-    environmentScope: '*',
-    size: '1',
-    clusterType: 'project_type',
+    environment_scope: '*',
+    cluster_type: 'project_type',
     status: 'cleanup_ongoing',
-    cpu: '6 (100% free)',
-    memory: '20.12 (35% free)',
   },
 ];
 
diff --git a/spec/frontend/clusters_list/store/actions_spec.js b/spec/frontend/clusters_list/store/actions_spec.js
index 70766af3ec4..74e351a3704 100644
--- a/spec/frontend/clusters_list/store/actions_spec.js
+++ b/spec/frontend/clusters_list/store/actions_spec.js
@@ -1,10 +1,14 @@
 import MockAdapter from 'axios-mock-adapter';
+import Poll from '~/lib/utils/poll';
 import flashError from '~/flash';
 import testAction from 'helpers/vuex_action_helper';
 import axios from '~/lib/utils/axios_utils';
+import waitForPromises from 'helpers/wait_for_promises';
 import { apiData } from '../mock_data';
+import { MAX_REQUESTS } from '~/clusters_list/constants';
 import * as types from '~/clusters_list/store/mutation_types';
 import * as actions from '~/clusters_list/store/actions';
+import * as Sentry from '@sentry/browser';
 
 jest.mock('~/flash.js');
 
@@ -12,6 +16,24 @@ describe('Clusters store actions', () => {
   describe('fetchClusters', () => {
     let mock;
 
+    const headers = {
+      'x-next-page': 1,
+      'x-total': apiData.clusters.length,
+      'x-total-pages': 1,
+      'x-per-page': 20,
+      'x-page': 1,
+      'x-prev-page': 1,
+    };
+
+    const paginationInformation = {
+      nextPage: 1,
+      page: 1,
+      perPage: 20,
+      previousPage: 1,
+      total: apiData.clusters.length,
+      totalPages: 1,
+    };
+
     beforeEach(() => {
       mock = new MockAdapter(axios);
     });
@@ -19,21 +41,6 @@ describe('Clusters store actions', () => {
     afterEach(() => mock.restore());
 
     it('should commit SET_CLUSTERS_DATA with received response', done => {
-      const headers = {
-        'x-total': apiData.clusters.length,
-        'x-per-page': 20,
-        'x-page': 1,
-      };
-
-      const paginationInformation = {
-        nextPage: NaN,
-        page: 1,
-        perPage: 20,
-        previousPage: NaN,
-        total: apiData.clusters.length,
-        totalPages: NaN,
-      };
-
       mock.onGet().reply(200, apiData, headers);
 
       testAction(
@@ -52,9 +59,110 @@ describe('Clusters store actions', () => {
     it('should show flash on API error', done => {
       mock.onGet().reply(400, 'Not Found');
 
-      testAction(actions.fetchClusters, { endpoint: apiData.endpoint }, {}, [], [], () => {
-        expect(flashError).toHaveBeenCalledWith(expect.stringMatching('error'));
-        done();
+      testAction(
+        actions.fetchClusters,
+        { endpoint: apiData.endpoint },
+        {},
+        [{ type: types.SET_LOADING_STATE, payload: false }],
+        [],
+        () => {
+          expect(flashError).toHaveBeenCalledWith(expect.stringMatching('error'));
+          done();
+        },
+      );
+    });
+
+    describe('multiple api requests', () => {
+      let captureException;
+      let pollRequest;
+      let pollStop;
+
+      const pollInterval = 10;
+      const pollHeaders = { 'poll-interval': pollInterval, ...headers };
+
+      beforeEach(() => {
+        captureException = jest.spyOn(Sentry, 'captureException');
+        pollRequest = jest.spyOn(Poll.prototype, 'makeRequest');
+        pollStop = jest.spyOn(Poll.prototype, 'stop');
+
+        mock.onGet().reply(200, apiData, pollHeaders);
+      });
+
+      afterEach(() => {
+        captureException.mockRestore();
+        pollRequest.mockRestore();
+        pollStop.mockRestore();
+      });
+
+      it('should stop polling after MAX Requests', done => {
+        testAction(
+          actions.fetchClusters,
+          { endpoint: apiData.endpoint },
+          {},
+          [
+            { type: types.SET_CLUSTERS_DATA, payload: { data: apiData, paginationInformation } },
+            { type: types.SET_LOADING_STATE, payload: false },
+          ],
+          [],
+          () => {
+            expect(pollRequest).toHaveBeenCalledTimes(1);
+            expect(pollStop).toHaveBeenCalledTimes(0);
+            jest.advanceTimersByTime(pollInterval);
+
+            waitForPromises()
+              .then(() => {
+                expect(pollRequest).toHaveBeenCalledTimes(2);
+                expect(pollStop).toHaveBeenCalledTimes(0);
+                jest.advanceTimersByTime(pollInterval);
+              })
+              .then(() => waitForPromises())
+              .then(() => {
+                expect(pollRequest).toHaveBeenCalledTimes(MAX_REQUESTS);
+                expect(pollStop).toHaveBeenCalledTimes(0);
+                jest.advanceTimersByTime(pollInterval);
+              })
+              .then(() => waitForPromises())
+              .then(() => {
+                expect(pollRequest).toHaveBeenCalledTimes(MAX_REQUESTS + 1);
+                // Stops poll once it exceeds the MAX_REQUESTS limit
+                expect(pollStop).toHaveBeenCalledTimes(1);
+                jest.advanceTimersByTime(pollInterval);
+              })
+              .then(() => waitForPromises())
+              .then(() => {
+                // Additional poll requests are not made once pollStop is called
+                expect(pollRequest).toHaveBeenCalledTimes(MAX_REQUESTS + 1);
+                expect(pollStop).toHaveBeenCalledTimes(1);
+              })
+              .then(done)
+              .catch(done.fail);
+          },
+        );
+      });
+
+      it('should stop polling and report to Sentry when data is invalid', done => {
+        const badApiResponse = { clusters: {} };
+        mock.onGet().reply(200, badApiResponse, pollHeaders);
+
+        testAction(
+          actions.fetchClusters,
+          { endpoint: apiData.endpoint },
+          {},
+          [
+            {
+              type: types.SET_CLUSTERS_DATA,
+              payload: { data: badApiResponse, paginationInformation },
+            },
+            { type: types.SET_LOADING_STATE, payload: false },
+          ],
+          [],
+          () => {
+            expect(pollRequest).toHaveBeenCalledTimes(1);
+            expect(pollStop).toHaveBeenCalledTimes(1);
+            expect(captureException).toHaveBeenCalledTimes(1);
+            done();
+          },
+        );
       });
     });
   });
diff --git a/spec/lib/gitlab/issuable_metadata_spec.rb b/spec/lib/gitlab/issuable_metadata_spec.rb
index 7632bc3060a..1920cecfc29 100644
--- a/spec/lib/gitlab/issuable_metadata_spec.rb
+++ b/spec/lib/gitlab/issuable_metadata_spec.rb
@@ -6,14 +6,12 @@ describe Gitlab::IssuableMetadata do
   let(:user)     { create(:user) }
   let!(:project) { create(:project, :public, :repository, creator: user, namespace: user.namespace) }
 
-  subject { Class.new { include Gitlab::IssuableMetadata }.new }
-
   it 'returns an empty Hash if an empty collection is provided' do
-    expect(subject.issuable_meta_data(Issue.none, 'Issue', user)).to eq({})
+    expect(described_class.new(user, Issue.none).data).to eq({})
   end
 
   it 'raises an error when given a collection with no limit' do
-    expect { subject.issuable_meta_data(Issue.all, 'Issue', user) }.to raise_error(/must have a limit/)
+    expect { described_class.new(user, Issue.all) }.to raise_error(/must have a limit/)
   end
 
   context 'issues' do
@@ -25,7 +23,7 @@ describe Gitlab::IssuableMetadata do
     let!(:closing_issues) { create(:merge_requests_closing_issues, issue: issue, merge_request: merge_request) }
 
     it 'aggregates stats on issues' do
-      data = subject.issuable_meta_data(Issue.all.limit(10), 'Issue', user)
+      data = described_class.new(user, Issue.all.limit(10)).data
 
       expect(data.count).to eq(2)
       expect(data[issue.id].upvotes).to eq(1)
@@ -48,7 +46,7 @@ describe Gitlab::IssuableMetadata do
     let!(:note) { create(:note_on_merge_request, author: user, project: project, noteable: merge_request, note: "a comment on a MR") }
 
     it 'aggregates stats on merge requests' do
-      data = subject.issuable_meta_data(MergeRequest.all.limit(10), 'MergeRequest', user)
+      data = described_class.new(user, MergeRequest.all.limit(10)).data
 
       expect(data.count).to eq(2)
       expect(data[merge_request.id].upvotes).to eq(1)
diff --git a/spec/models/ci/runner_spec.rb b/spec/models/ci/runner_spec.rb
index f741d2d9acf..296240b1602 100644
--- a/spec/models/ci/runner_spec.rb
+++ b/spec/models/ci/runner_spec.rb
@@ -263,7 +263,7 @@ describe Ci::Runner do
     subject { described_class.online }
 
     before do
-      @runner1 = create(:ci_runner, :instance, contacted_at: 1.hour.ago)
+      @runner1 = create(:ci_runner, :instance, contacted_at: 2.hours.ago)
       @runner2 = create(:ci_runner, :instance, contacted_at: 1.second.ago)
     end
 
@@ -344,7 +344,7 @@ describe Ci::Runner do
     subject { described_class.offline }
 
     before do
-      @runner1 = create(:ci_runner, :instance, contacted_at: 1.hour.ago)
+      @runner1 = create(:ci_runner, :instance, contacted_at: 2.hours.ago)
       @runner2 = create(:ci_runner, :instance, contacted_at: 1.second.ago)
     end
 
@@ -598,10 +598,10 @@ describe Ci::Runner do
     end
   end
 
-  describe '#update_cached_info' do
+  describe '#heartbeat' do
     let(:runner) { create(:ci_runner, :project) }
 
-    subject { runner.update_cached_info(architecture: '18-bit') }
+    subject { runner.heartbeat(architecture: '18-bit') }
 
     context 'when database was updated recently' do
       before do
diff --git a/spec/models/iteration_spec.rb b/spec/models/iteration_spec.rb
index 62a5d9a7cf9..ae14adf9106 100644
--- a/spec/models/iteration_spec.rb
+++ b/spec/models/iteration_spec.rb
@@ -46,10 +46,7 @@ describe Iteration do
       end
 
       context 'when dates overlap' do
-        let(:start_date) { 5.days.from_now }
-        let(:due_date) { 6.days.from_now }
-
-        shared_examples_for 'overlapping dates' do
+        context 'same group' do
           context 'when start_date is in range' do
             let(:start_date) { 5.days.from_now }
             let(:due_date) { 3.weeks.from_now }
@@ -58,11 +55,6 @@ describe Iteration do
               expect(subject).not_to be_valid
               expect(subject.errors[:base]).to include('Dates cannot overlap with other existing Iterations')
             end
-
-            it 'is not valid even if forced' do
-              subject.validate # to generate iid/etc
-              expect { subject.save(validate: false) }.to raise_exception(ActiveRecord::StatementInvalid, /#{constraint_name}/)
-            end
           end
 
           context 'when end_date is in range' do
@@ -73,84 +65,25 @@ describe Iteration do
               expect(subject).not_to be_valid
               expect(subject.errors[:base]).to include('Dates cannot overlap with other existing Iterations')
             end
-
-            it 'is not valid even if forced' do
-              subject.validate # to generate iid/etc
-              expect { subject.save(validate: false) }.to raise_exception(ActiveRecord::StatementInvalid, /#{constraint_name}/)
-            end
           end
 
           context 'when both overlap' do
+            let(:start_date) { 5.days.from_now }
+            let(:due_date) { 6.days.from_now }
+
             it 'is not valid' do
               expect(subject).not_to be_valid
               expect(subject.errors[:base]).to include('Dates cannot overlap with other existing Iterations')
             end
-
-            it 'is not valid even if forced' do
-              subject.validate # to generate iid/etc
-              expect { subject.save(validate: false) }.to raise_exception(ActiveRecord::StatementInvalid, /#{constraint_name}/)
-            end
           end
         end
 
-        context 'group' do
-          it_behaves_like 'overlapping dates' do
-            let(:constraint_name) { 'iteration_start_and_due_daterange_group_id_constraint' }
-          end
+        context 'different group' do
+          let(:start_date) { 5.days.from_now }
+          let(:due_date) { 6.days.from_now }
+          let(:group) { create(:group) }
 
-          context 'different group' do
-            let(:group) { create(:group) }
-
-            it { is_expected.to be_valid }
-
-            it 'does not trigger exclusion constraints' do
-              expect { subject.save }.not_to raise_exception
-            end
-          end
-
-          context 'in a project' do
-            let(:project) { create(:project) }
-
-            subject { build(:iteration, project: project, start_date: start_date, due_date: due_date) }
-
-            it { is_expected.to be_valid }
-
-            it 'does not trigger exclusion constraints' do
-              expect { subject.save }.not_to raise_exception
-            end
-          end
-        end
-
-        context 'project' do
-          let_it_be(:existing_iteration) { create(:iteration, project: project, start_date: 4.days.from_now, due_date: 1.week.from_now) }
-
-          subject { build(:iteration, project: project, start_date: start_date, due_date: due_date) }
-
-          it_behaves_like 'overlapping dates' do
-            let(:constraint_name) { 'iteration_start_and_due_daterange_project_id_constraint' }
-          end
-
-          context 'different project' do
-            let(:project) { create(:project) }
-
-            it { is_expected.to be_valid }
-
-            it 'does not trigger exclusion constraints' do
-              expect { subject.save }.not_to raise_exception
-            end
-          end
-
-          context 'in a group' do
-            let(:group) { create(:group) }
-
-            subject { build(:iteration, group: group, start_date: start_date, due_date: due_date) }
-
-            it { is_expected.to be_valid }
-
-            it 'does not trigger exclusion constraints' do
-              expect { subject.save }.not_to raise_exception
-            end
-          end
+          it { is_expected.to be_valid }
         end
       end
     end
diff --git a/spec/requests/api/runner_spec.rb b/spec/requests/api/runner_spec.rb
index 913dcb63d6e..6d4495a255d 100644
--- a/spec/requests/api/runner_spec.rb
+++ b/spec/requests/api/runner_spec.rb
@@ -1129,6 +1129,10 @@ describe API::Runner, :clean_gitlab_redis_shared_state do
         let(:send_request) { update_job(state: 'success') }
       end
 
+      it 'updates runner info' do
+        expect { update_job(state: 'success') }.to change { runner.reload.contacted_at }
+      end
+
       context 'when status is given' do
         it 'mark job as succeeded' do
           update_job(state: 'success')
@@ -1294,6 +1298,12 @@ describe API::Runner, :clean_gitlab_redis_shared_state do
         let(:send_request) { patch_the_trace }
       end
 
+      it 'updates runner info' do
+        runner.update!(contacted_at: 1.year.ago)
+
+        expect { patch_the_trace }.to change { runner.reload.contacted_at }
+      end
+
       context 'when request is valid' do
         it 'gets correct response' do
           expect(response).to have_gitlab_http_status(:accepted)
@@ -1555,6 +1565,10 @@ describe API::Runner, :clean_gitlab_redis_shared_state do
               let(:send_request) { subject }
             end
 
+            it 'updates runner info' do
+              expect { subject }.to change { runner.reload.contacted_at }
+            end
+
             shared_examples 'authorizes local file' do
               it 'succeeds' do
                 subject
@@ -1743,6 +1757,10 @@ describe API::Runner, :clean_gitlab_redis_shared_state do
           end
         end
 
+        it 'updates runner info' do
+          expect { upload_artifacts(file_upload, headers_with_token) }.to change { runner.reload.contacted_at }
+        end
+
         context 'when artifacts are being stored inside of tmp path' do
           before do
             # by configuring this path we allow to pass temp file from any path
@@ -2228,6 +2246,10 @@ describe API::Runner, :clean_gitlab_redis_shared_state do
           let(:send_request) { download_artifact }
         end
 
+        it 'updates runner info' do
+          expect { download_artifact }.to change { runner.reload.contacted_at }
+        end
+
         context 'when job has artifacts' do
           let(:job) { create(:ci_build) }
           let(:store) { JobArtifactUploader::Store::LOCAL }
diff --git a/spec/support/shared_examples/controllers/issuables_list_metadata_shared_examples.rb b/spec/support/shared_examples/controllers/issuables_list_metadata_shared_examples.rb
index 2dbaea57c44..62a1a07b6c1 100644
--- a/spec/support/shared_examples/controllers/issuables_list_metadata_shared_examples.rb
+++ b/spec/support/shared_examples/controllers/issuables_list_metadata_shared_examples.rb
@@ -34,7 +34,7 @@ RSpec.shared_examples 'issuables list meta-data' do |issuable_type, action = nil
 
     aggregate_failures do
       expect(meta_data.keys).to match_array(issuables.map(&:id))
-      expect(meta_data.values).to all(be_kind_of(Issuable::IssuableMeta))
+      expect(meta_data.values).to all(be_kind_of(Gitlab::IssuableMetadata::IssuableMeta))
     end
   end
 
diff --git a/yarn.lock b/yarn.lock
index 0c2d52e6df2..b3f4be1897e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -787,7 +787,7 @@
   resolved "https://registry.yarnpkg.com/@gitlab/svgs/-/svgs-1.130.0.tgz#0c2f3cdc0a4b0f54c47b2861c8fa31b2a58c570a"
   integrity sha512-azJ1E9PBk6fGOaP6816BSr8oYrQu3m3BbYZwWOCUp8AfbZuf0ZOZVYmlR9i/eAOhoqqqmwF8hYCK2VjAklbpPA==
 
-"@gitlab/ui@16.0":
+"@gitlab/ui@16.0.0":
   version "16.0.0"
   resolved "https://registry.yarnpkg.com/@gitlab/ui/-/ui-16.0.0.tgz#0e2d19b85c47f45a052caf6cd0367613cbab8e8e"
   integrity sha512-xSWXtFWWQzGtL35dGexc5LGqAJXYjLMEFQyPLzCBX3yY9tkI9s9rVMX053tnKYb9kgEmL+R/xGiW7D9nb58VmQ==