diff --git a/.gitlab/ci/review.gitlab-ci.yml b/.gitlab/ci/review.gitlab-ci.yml
index 6f33057a057..72f0b5028a5 100644
--- a/.gitlab/ci/review.gitlab-ci.yml
+++ b/.gitlab/ci/review.gitlab-ci.yml
@@ -54,6 +54,7 @@ review-deploy:
   extends:
     - .review-workflow-base
     - .review:rules:review-deploy
+  retry: 2
   stage: review
   needs: ["review-build-cng"]
   resource_group: "review/${CI_COMMIT_REF_NAME}"
diff --git a/app/assets/javascripts/issuable/components/csv_export_modal.vue b/app/assets/javascripts/issuable/components/csv_export_modal.vue
index f17440a4a14..5c880cbfad8 100644
--- a/app/assets/javascripts/issuable/components/csv_export_modal.vue
+++ b/app/assets/javascripts/issuable/components/csv_export_modal.vue
@@ -51,7 +51,6 @@ export default {
     </template>
     <div
       v-if="issuableCount > -1"
-      data-testid="issuable-count-note"
       class="gl-justify-content-start gl-align-items-center gl-p-4 gl-border-b-solid gl-border-1 gl-border-gray-50"
     >
       <gl-icon name="check" class="gl-color-green-400" />
diff --git a/app/assets/javascripts/issuable/components/csv_import_export_buttons.vue b/app/assets/javascripts/issuable/components/csv_import_export_buttons.vue
index fb4d5aca2f5..5d75b87fe76 100644
--- a/app/assets/javascripts/issuable/components/csv_import_export_buttons.vue
+++ b/app/assets/javascripts/issuable/components/csv_import_export_buttons.vue
@@ -72,9 +72,6 @@ export default {
     importModalId() {
       return `${this.issuableType}-import-modal`;
     },
-    importButtonText() {
-      return this.showLabel ? this.$options.i18n.importIssuesText : null;
-    },
     importButtonTooltipText() {
       return this.showLabel ? null : this.$options.i18n.importIssuesText;
     },
@@ -90,29 +87,25 @@ export default {
     <gl-button-group>
       <gl-button
         v-if="showExportButton"
-        v-gl-tooltip.hover="$options.i18n.exportAsCsvButtonText"
+        v-gl-tooltip="$options.i18n.exportAsCsvButtonText"
         v-gl-modal="exportModalId"
         icon="export"
         :aria-label="$options.i18n.exportAsCsvButtonText"
         data-qa-selector="export_as_csv_button"
-        data-testid="export-csv-button"
       />
       <gl-dropdown
         v-if="showImportButton"
-        v-gl-tooltip.hover="importButtonTooltipText"
+        v-gl-tooltip="importButtonTooltipText"
         data-qa-selector="import_issues_dropdown"
-        data-testid="import-csv-dropdown"
-        :text="importButtonText"
+        :text="$options.i18n.importIssuesText"
+        :text-sr-only="!showLabel"
         :icon="importButtonIcon"
       >
-        <gl-dropdown-item v-gl-modal="importModalId" data-testid="import-csv-link">{{
-          __('Import CSV')
-        }}</gl-dropdown-item>
+        <gl-dropdown-item v-gl-modal="importModalId">{{ __('Import CSV') }}</gl-dropdown-item>
         <gl-dropdown-item
           v-if="canEdit"
           :href="projectImportJiraPath"
           data-qa-selector="import_from_jira_link"
-          data-testid="import-from-jira-link"
           >{{ __('Import from Jira') }}</gl-dropdown-item
         >
       </gl-dropdown>
diff --git a/app/assets/javascripts/issuable/components/csv_import_modal.vue b/app/assets/javascripts/issuable/components/csv_import_modal.vue
index 77fc2f31583..c85efd60b8b 100644
--- a/app/assets/javascripts/issuable/components/csv_import_modal.vue
+++ b/app/assets/javascripts/issuable/components/csv_import_modal.vue
@@ -48,13 +48,7 @@ export default {
 
 <template>
   <gl-modal :modal-id="modalId" :title="__('Import issues')">
-    <form
-      ref="form"
-      :action="importCsvIssuesPath"
-      enctype="multipart/form-data"
-      method="post"
-      data-testid="import-csv-form"
-    >
+    <form ref="form" :action="importCsvIssuesPath" enctype="multipart/form-data" method="post">
       <input :value="$options.csrf.token" type="hidden" name="authenticity_token" />
       <p>
         {{
diff --git a/app/assets/javascripts/issuable/components/issuable_by_email.vue b/app/assets/javascripts/issuable/components/issuable_by_email.vue
index d0ce8c2c34b..97807ba1317 100644
--- a/app/assets/javascripts/issuable/components/issuable_by_email.vue
+++ b/app/assets/javascripts/issuable/components/issuable_by_email.vue
@@ -91,7 +91,7 @@ export default {
 
 <template>
   <div>
-    <gl-button v-gl-modal="$options.modalId" variant="link" data-testid="issuable-email-modal-btn"
+    <gl-button v-gl-modal="$options.modalId" variant="link"
       ><gl-sprintf :message="__('Email a new %{name} to this project')"
         ><template #name>{{ issuableName }}</template></gl-sprintf
       ></gl-button
@@ -122,7 +122,6 @@ export default {
             :title="$options.i18n.sendEmail"
             :aria-label="$options.i18n.sendEmail"
             icon="mail"
-            data-testid="mail-to-btn"
           />
         </template>
       </gl-form-input-group>
@@ -156,12 +155,7 @@ export default {
             /></gl-link>
           </template>
           <template #resetLink="{ content }">
-            <gl-button
-              variant="link"
-              data-testid="incoming-email-token-reset"
-              @click="resetIncomingEmailToken"
-              >{{ content }}</gl-button
-            >
+            <gl-button variant="link" @click="resetIncomingEmailToken">{{ content }}</gl-button>
           </template>
         </gl-sprintf>
       </p>
diff --git a/app/assets/javascripts/issuable/components/status_box.vue b/app/assets/javascripts/issuable/components/status_box.vue
index cb768f2bc5b..bd6fdc131cb 100644
--- a/app/assets/javascripts/issuable/components/status_box.vue
+++ b/app/assets/javascripts/issuable/components/status_box.vue
@@ -91,11 +91,7 @@ export default {
 
 <template>
   <div :class="statusBoxClass" class="issuable-status-box status-box">
-    <gl-icon
-      :name="statusIconName"
-      class="gl-display-block gl-sm-display-none!"
-      data-testid="status-icon"
-    />
+    <gl-icon :name="statusIconName" class="gl-display-block gl-sm-display-none!" />
     <span class="gl-display-none gl-sm-display-block">
       {{ statusHumanName }}
     </span>
diff --git a/app/assets/javascripts/lib/utils/url_utility.js b/app/assets/javascripts/lib/utils/url_utility.js
index 5b3aa3cf9dc..a989a1f77da 100644
--- a/app/assets/javascripts/lib/utils/url_utility.js
+++ b/app/assets/javascripts/lib/utils/url_utility.js
@@ -484,13 +484,17 @@ export const setUrlParams = (
       searchParams.delete(key);
     } else if (Array.isArray(params[key])) {
       const keyName = railsArraySyntax ? `${key}[]` : key;
-      params[key].forEach((val, idx) => {
-        if (idx === 0) {
-          searchParams.set(keyName, val);
-        } else {
-          searchParams.append(keyName, val);
-        }
-      });
+      if (params[key].length === 0) {
+        searchParams.delete(keyName);
+      } else {
+        params[key].forEach((val, idx) => {
+          if (idx === 0) {
+            searchParams.set(keyName, val);
+          } else {
+            searchParams.append(keyName, val);
+          }
+        });
+      }
     } else {
       searchParams.set(key, params[key]);
     }
diff --git a/app/assets/stylesheets/framework/gfm.scss b/app/assets/stylesheets/framework/gfm.scss
index 579a68ac8e4..40e11b50eba 100644
--- a/app/assets/stylesheets/framework/gfm.scss
+++ b/app/assets/stylesheets/framework/gfm.scss
@@ -4,7 +4,8 @@
 
 .gfm-commit,
 .gfm-commit_range {
-  @extend .commit-sha;
+  @include gl-font-monospace;
+  font-size: 95%;
 }
 
 .gfm-project_member {
diff --git a/app/assets/stylesheets/pages/search.scss b/app/assets/stylesheets/pages/search.scss
index cd99c667001..f83ba89daae 100644
--- a/app/assets/stylesheets/pages/search.scss
+++ b/app/assets/stylesheets/pages/search.scss
@@ -45,7 +45,6 @@ input[type='checkbox']:hover {
   margin: 0 8px;
 
   form {
-    @extend .form-control;
     margin: 0;
     padding: 4px;
     width: $search-input-width;
@@ -139,7 +138,6 @@ input[type='checkbox']:hover {
 
   &.search-active {
     form {
-      @extend .form-control:focus;
       border-color: $blue-300;
       box-shadow: none;
 
diff --git a/app/assets/stylesheets/utilities.scss b/app/assets/stylesheets/utilities.scss
index c22a1ae1187..b8183a0d82f 100644
--- a/app/assets/stylesheets/utilities.scss
+++ b/app/assets/stylesheets/utilities.scss
@@ -83,7 +83,6 @@
   }
 }
 
-.gl-text-purple { color: $purple; }
 .gl-bg-purple-light { background-color: $purple-light; }
 
 // move this to GitLab UI once onboarding experiment is considered a success
diff --git a/app/views/layouts/_search.html.haml b/app/views/layouts/_search.html.haml
index 2032d1e95a6..e617b4358e3 100644
--- a/app/views/layouts/_search.html.haml
+++ b/app/views/layouts/_search.html.haml
@@ -1,5 +1,5 @@
 .search.search-form{ data: { track_label: "navbar_search", track_event: "activate_form_input", track_value: "" } }
-  = form_tag search_path, method: :get, class: 'form-inline' do |_f|
+  = form_tag search_path, method: :get, class: 'form-inline form-control' do |_f|
     .search-input-container
       .search-input-wrap
         .dropdown{ data: { url: search_autocomplete_path } }
diff --git a/changelogs/unreleased/330402-remove-unicorn-gitlab-health-check.yml b/changelogs/unreleased/330402-remove-unicorn-gitlab-health-check.yml
new file mode 100644
index 00000000000..4867f75652e
--- /dev/null
+++ b/changelogs/unreleased/330402-remove-unicorn-gitlab-health-check.yml
@@ -0,0 +1,5 @@
+---
+title: Remove UnicornCheck service
+merge_request: 62204
+author:
+type: removed
diff --git a/changelogs/unreleased/sh-smplify-external-validation-error-codes.yml b/changelogs/unreleased/sh-smplify-external-validation-error-codes.yml
new file mode 100644
index 00000000000..4f6ab6ea472
--- /dev/null
+++ b/changelogs/unreleased/sh-smplify-external-validation-error-codes.yml
@@ -0,0 +1,5 @@
+---
+title: Simplify error code handling for external pipeline validation
+merge_request: 61190
+author:
+type: changed
diff --git a/config/initializers/cluster_events_before_phased_restart.rb b/config/initializers/cluster_events_before_phased_restart.rb
index d029adbe363..f84682c1436 100644
--- a/config/initializers/cluster_events_before_phased_restart.rb
+++ b/config/initializers/cluster_events_before_phased_restart.rb
@@ -7,8 +7,6 @@
 #
 # Follow-up the issue: https://gitlab.com/gitlab-org/gitlab/issues/34107
 
-if Gitlab::Runtime.puma?
-  Puma::Cluster.prepend(::Gitlab::Cluster::Mixins::PumaCluster)
-elsif Gitlab::Runtime.unicorn?
-  Unicorn::HttpServer.prepend(::Gitlab::Cluster::Mixins::UnicornHttpServer)
-end
+return unless Gitlab::Runtime.puma?
+
+Puma::Cluster.prepend(::Gitlab::Cluster::Mixins::PumaCluster)
diff --git a/doc/administration/external_pipeline_validation.md b/doc/administration/external_pipeline_validation.md
index 89543e446ac..23207de4999 100644
--- a/doc/administration/external_pipeline_validation.md
+++ b/doc/administration/external_pipeline_validation.md
@@ -17,7 +17,7 @@ data as payload. The response code from the external service determines if GitLa
 should accept or reject the pipeline. If the response is:
 
 - `200`, the pipeline is accepted.
-- `4XX`, the pipeline is rejected.
+- `406`, the pipeline is rejected.
 - Other codes, the pipeline is accepted and logged.
 
 If there's an error or the request times out, the pipeline is accepted.
diff --git a/doc/install/installation.md b/doc/install/installation.md
index 3af3d2bfe7a..b9bde01c2fa 100644
--- a/doc/install/installation.md
+++ b/doc/install/installation.md
@@ -45,6 +45,15 @@ You can select the branch in the version dropdown in the top left corner of GitL
 
 If the highest number stable branch is unclear, check the [GitLab blog](https://about.gitlab.com/blog/) for installation guide links by version.
 
+## Software requirements
+
+| Software | Minimum version | Notes |
+| -------- | --------------- | ----- |
+| [Ruby](#2-ruby)     | `2.7`             | From GitLab 13.6, Ruby 2.7 is required. Ruby 3.0 is not supported yet (see [the relevant epic](https://gitlab.com/groups/gitlab-org/-/epics/5149) for the current status). You must use the standard MRI implementation of Ruby. We love [JRuby](https://www.jruby.org/) and [Rubinius](https://github.com/rubinius/rubinius#the-rubinius-language-platform), but GitLab needs several Gems that have native extensions. |
+| [Go](#3-go) | `1.15` | |
+| [Git](#git) | `2.31.x` | From GitLab 13.11, Git 2.31.x and later is required. It's highly recommended that you use the [Git version provided by Gitaly](#git). |
+| [Node.js](#4-node) | `12.22.1` | GitLab uses [webpack](https://webpack.js.org/) to compile frontend assets. Node.js 14.x is recommended, as it's faster. You can check which version you're running with `node -v`. You need to update it to a newer version if needed. |
+
 ## GitLab directory structure
 
 This is the main directory structure you end up with following the instructions
@@ -207,7 +216,7 @@ sudo apt-get install -y libimage-exiftool-perl
 ## 2. Ruby
 
 The Ruby interpreter is required to run GitLab.
-See the [requirements page](requirements.md#ruby-versions) for the minimum
+See the [requirements section of this page](#software-requirements) for the minimum
 Ruby requirements.
 
 The use of Ruby version managers such as [`RVM`](https://rvm.io/), [`rbenv`](https://github.com/rbenv/rbenv) or [`chruby`](https://github.com/postmodern/chruby) with GitLab
diff --git a/doc/install/requirements.md b/doc/install/requirements.md
index 9aa06030c24..5c723ee06cd 100644
--- a/doc/install/requirements.md
+++ b/doc/install/requirements.md
@@ -47,55 +47,6 @@ Please consider using a virtual machine to run GitLab.
 
 ## Software requirements
 
-### Ruby versions
-
-From GitLab 13.6:
-
-- Ruby 2.7 and later is required.
-
-From GitLab 12.2:
-
-- Ruby 2.6 and later is required.
-
-You must use the standard MRI implementation of Ruby.
-We love [JRuby](https://www.jruby.org/) and [Rubinius](https://github.com/rubinius/rubinius#the-rubinius-language-platform), but GitLab
-needs several Gems that have native extensions.
-
-### Go versions
-
-The minimum required Go version is 1.13.
-
-### Git versions
-
-From GitLab 13.11:
-
-- Git 2.31.x and later is required. We recommend you use the
-  [Git version provided by Gitaly](installation.md#git).
-
-From GitLab 13.6:
-
-- Git 2.29.x and later is required.
-
-From GitLab 13.1:
-
-- Git 2.24.x and later is required.
-- Git 2.28.x and later [is recommended](https://gitlab.com/gitlab-org/gitaly/-/issues/2959).
-
-### Node.js versions
-
-Beginning in GitLab 12.9, we only support Node.js 10.13.0 or higher, and we have dropped
-support for Node.js 8. (Node.js 6 support was dropped in GitLab 11.8)
-
-We recommend Node 14.x, as it's faster.
-
-GitLab uses [webpack](https://webpack.js.org/) to compile frontend assets, which requires a minimum
-version of Node.js 10.13.0.
-
-You can check which version you're running with `node -v`. If you're running
-a version older than `v10.13.0`, you need to update it to a newer version. You
-can find instructions to install from community maintained packages or compile
-from source at the [Node.js website](https://nodejs.org/en/download/).
-
 ### Redis versions
 
 GitLab 13.0 and later requires Redis version 4.0 or higher.
diff --git a/doc/update/upgrading_from_source.md b/doc/update/upgrading_from_source.md
index 93d2c2cb288..78eb6fab10b 100644
--- a/doc/update/upgrading_from_source.md
+++ b/doc/update/upgrading_from_source.md
@@ -82,7 +82,7 @@ sudo make install
 
 ### 4. Update Node.js
 
-To check the minimum required Node.js version, see [Node.js versions](../install/requirements.md#nodejs-versions).
+To check the minimum required Node.js version, see [Node.js versions](../install/installation.md#software-requirements).
 
 GitLab also requires the use of Yarn `>= v1.10.0` to manage JavaScript
 dependencies.
@@ -99,7 +99,7 @@ More information can be found on the [Yarn website](https://classic.yarnpkg.com/
 
 ### 5. Update Go
 
-To check the minimum required Go version, see [Go versions](../install/requirements.md#go-versions).
+To check the minimum required Go version, see [Go versions](../install/installation.md#software-requirements).
 
 You can check which version you are running with `go version`.
 
@@ -119,12 +119,8 @@ rm go1.13.5.linux-amd64.tar.gz
 
 ### 6. Update Git
 
-WARNING:
-From GitLab 13.1, you must use at least Git v2.24 (previous minimum version was v2.22).
-Git v2.28 is recommended.
-
 To check you are running the minimum required Git version, see
-[Git versions](../install/requirements.md#git-versions).
+[Git versions](../install/installation.md#software-requirements).
 
 From GitLab 13.6, we recommend you use the [Git version provided by
 Gitaly](https://gitlab.com/gitlab-org/gitaly/-/issues/2729)
diff --git a/lib/gitlab/ci/pipeline/chain/validate/external.rb b/lib/gitlab/ci/pipeline/chain/validate/external.rb
index e8fe3b4f797..18675f80279 100644
--- a/lib/gitlab/ci/pipeline/chain/validate/external.rb
+++ b/lib/gitlab/ci/pipeline/chain/validate/external.rb
@@ -12,8 +12,7 @@ module Gitlab
 
             DEFAULT_VALIDATION_REQUEST_TIMEOUT = 5
             ACCEPTED_STATUS = 200
-            DOT_COM_REJECTED_STATUS = 406
-            GENERAL_REJECTED_STATUS = (400..499).freeze
+            REJECTED_STATUS = 406
 
             def perform!
               pipeline_authorized = validate_external
@@ -34,14 +33,13 @@ module Gitlab
               return true unless validation_service_url
 
               # 200 - accepted
-              # 406 - not accepted on GitLab.com
-              # 4XX - not accepted for other installations
+              # 406 - rejected
               # everything else - accepted and logged
               response_code = validate_service_request.code
               case response_code
               when ACCEPTED_STATUS
                 true
-              when rejected_status
+              when REJECTED_STATUS
                 false
               else
                 raise InvalidResponseCode, "Unsupported response code received from Validation Service: #{response_code}"
@@ -52,14 +50,6 @@ module Gitlab
               true
             end
 
-            def rejected_status
-              if Gitlab.com?
-                DOT_COM_REJECTED_STATUS
-              else
-                GENERAL_REJECTED_STATUS
-              end
-            end
-
             def validate_service_request
               headers = {
                 'X-Gitlab-Correlation-id' => Labkit::Correlation::CorrelationId.current_id,
diff --git a/lib/gitlab/cluster/mixins/unicorn_http_server.rb b/lib/gitlab/cluster/mixins/unicorn_http_server.rb
deleted file mode 100644
index 440ed02a355..00000000000
--- a/lib/gitlab/cluster/mixins/unicorn_http_server.rb
+++ /dev/null
@@ -1,34 +0,0 @@
-# frozen_string_literal: true
-
-module Gitlab
-  module Cluster
-    module Mixins
-      module UnicornHttpServer
-        def self.prepended(base)
-          unless base.method_defined?(:reexec) && base.method_defined?(:stop)
-            raise 'missing method Unicorn::HttpServer#reexec or Unicorn::HttpServer#stop'
-          end
-        end
-
-        def reexec
-          Gitlab::Cluster::LifecycleEvents.do_before_graceful_shutdown
-
-          super
-        end
-
-        # The stop on non-graceful shutdown is executed twice:
-        # `#stop(false)` and `#stop`.
-        #
-        # The first stop will wipe-out all workers, so we need to check
-        # the flag and a list of workers
-        def stop(graceful = true)
-          if graceful && @workers.any? # rubocop:disable Gitlab/ModuleWithInstanceVariables
-            Gitlab::Cluster::LifecycleEvents.do_before_graceful_shutdown
-          end
-
-          super
-        end
-      end
-    end
-  end
-end
diff --git a/lib/gitlab/health_checks/unicorn_check.rb b/lib/gitlab/health_checks/unicorn_check.rb
deleted file mode 100644
index f0c6fdab600..00000000000
--- a/lib/gitlab/health_checks/unicorn_check.rb
+++ /dev/null
@@ -1,41 +0,0 @@
-# frozen_string_literal: true
-
-module Gitlab
-  module HealthChecks
-    # This check can only be run on Unicorn `master` process
-    class UnicornCheck
-      extend SimpleAbstractCheck
-
-      class << self
-        include Gitlab::Utils::StrongMemoize
-
-        private
-
-        def metric_prefix
-          'unicorn_check'
-        end
-
-        def successful?(result)
-          result > 0
-        end
-
-        def check
-          return unless http_servers
-
-          http_servers.sum(&:worker_processes)
-        end
-
-        # Traversal of ObjectSpace is expensive, on fully loaded application
-        # it takes around 80ms. The instances of HttpServers are not a subject
-        # to change so we can cache the list of servers.
-        def http_servers
-          strong_memoize(:http_servers) do
-            next unless Gitlab::Runtime.unicorn?
-
-            ObjectSpace.each_object(::Unicorn::HttpServer).to_a
-          end
-        end
-      end
-    end
-  end
-end
diff --git a/lib/gitlab/metrics/exporter/web_exporter.rb b/lib/gitlab/metrics/exporter/web_exporter.rb
index 558454eaa1c..756e6b0641a 100644
--- a/lib/gitlab/metrics/exporter/web_exporter.rb
+++ b/lib/gitlab/metrics/exporter/web_exporter.rb
@@ -30,8 +30,7 @@ module Gitlab
           # application: https://gitlab.com/gitlab-org/gitlab/issues/35343
           self.readiness_checks = [
             WebExporter::ExporterCheck.new(self),
-            Gitlab::HealthChecks::PumaCheck,
-            Gitlab::HealthChecks::UnicornCheck
+            Gitlab::HealthChecks::PumaCheck
           ]
         end
 
diff --git a/package.json b/package.json
index d90dccf2820..74780bac936 100644
--- a/package.json
+++ b/package.json
@@ -53,7 +53,7 @@
     "@gitlab/favicon-overlay": "2.0.0",
     "@gitlab/svgs": "1.197.0",
     "@gitlab/tributejs": "1.0.0",
-    "@gitlab/ui": "29.27.0",
+    "@gitlab/ui": "29.28.0",
     "@gitlab/visual-review-tools": "1.6.1",
     "@rails/actioncable": "^6.0.3-4",
     "@rails/ujs": "^6.0.3-4",
diff --git a/qa/qa/specs/features/browser_ui/3_create/merge_request/create_merge_request_spec.rb b/qa/qa/specs/features/browser_ui/3_create/merge_request/create_merge_request_spec.rb
index 81ad1896075..b998ad24358 100644
--- a/qa/qa/specs/features/browser_ui/3_create/merge_request/create_merge_request_spec.rb
+++ b/qa/qa/specs/features/browser_ui/3_create/merge_request/create_merge_request_spec.rb
@@ -16,7 +16,7 @@ module QA
         Flow::Login.sign_in
       end
 
-      it 'creates a basic merge request', :smoke, testcase: 'https://gitlab.com/gitlab-org/quality/testcases/-/issues/1276' do
+      it 'creates a basic merge request', :smoke, testcase: 'https://gitlab.com/gitlab-org/quality/testcases/-/issues/1850' do
         Resource::MergeRequest.fabricate_via_browser_ui! do |merge_request|
           merge_request.project = project
           merge_request.title = merge_request_title
diff --git a/qa/qa/specs/features/browser_ui/3_create/repository/push_http_private_token_spec.rb b/qa/qa/specs/features/browser_ui/3_create/repository/push_http_private_token_spec.rb
index 2c0fb5ea290..67b48d254ac 100644
--- a/qa/qa/specs/features/browser_ui/3_create/repository/push_http_private_token_spec.rb
+++ b/qa/qa/specs/features/browser_ui/3_create/repository/push_http_private_token_spec.rb
@@ -3,7 +3,7 @@
 module QA
   RSpec.describe 'Create' do
     describe 'Git push over HTTP', :smoke do
-      it 'user using a personal access token pushes code to the repository', testcase: 'https://gitlab.com/gitlab-org/quality/testcases/-/issues/1278' do
+      it 'user using a personal access token pushes code to the repository', testcase: 'https://gitlab.com/gitlab-org/quality/testcases/-/issues/1848' do
         Flow::Login.sign_in
 
         access_token = Resource::PersonalAccessToken.fabricate!.token
diff --git a/qa/qa/specs/features/browser_ui/4_verify/pipeline/create_and_process_pipeline_spec.rb b/qa/qa/specs/features/browser_ui/4_verify/pipeline/create_and_process_pipeline_spec.rb
index 8617e05f912..cdb64361549 100644
--- a/qa/qa/specs/features/browser_ui/4_verify/pipeline/create_and_process_pipeline_spec.rb
+++ b/qa/qa/specs/features/browser_ui/4_verify/pipeline/create_and_process_pipeline_spec.rb
@@ -24,7 +24,7 @@ module QA
         runner.remove_via_api!
       end
 
-      it 'users creates a pipeline which gets processed', :smoke, testcase: 'https://gitlab.com/gitlab-org/quality/testcases/-/issues/1279' do
+      it 'users creates a pipeline which gets processed', :smoke, testcase: 'https://gitlab.com/gitlab-org/quality/testcases/-/issues/1849' do
         Flow::Login.sign_in
 
         Resource::Repository::Commit.fabricate_via_api! do |commit|
diff --git a/qa/qa/specs/features/browser_ui/7_configure/auto_devops/create_project_with_auto_devops_spec.rb b/qa/qa/specs/features/browser_ui/7_configure/auto_devops/create_project_with_auto_devops_spec.rb
index e2cf5c5b195..44888408f4e 100644
--- a/qa/qa/specs/features/browser_ui/7_configure/auto_devops/create_project_with_auto_devops_spec.rb
+++ b/qa/qa/specs/features/browser_ui/7_configure/auto_devops/create_project_with_auto_devops_spec.rb
@@ -115,7 +115,7 @@ module QA
         end
       end
 
-      it 'runs an AutoDevOps pipeline', testcase: 'https://gitlab.com/gitlab-org/quality/testcases/-/issues/1277' do
+      it 'runs an AutoDevOps pipeline', testcase: 'https://gitlab.com/gitlab-org/quality/testcases/-/issues/1847' do
         Flow::Pipeline.visit_latest_pipeline
 
         Page::Project::Pipeline::Show.perform do |pipeline|
diff --git a/rubocop/cop/usage_data/instrumentation_superclass.rb b/rubocop/cop/usage_data/instrumentation_superclass.rb
new file mode 100644
index 00000000000..2ff2ed47a23
--- /dev/null
+++ b/rubocop/cop/usage_data/instrumentation_superclass.rb
@@ -0,0 +1,63 @@
+# frozen_string_literal: true
+
+module RuboCop
+  module Cop
+    module UsageData
+      # This cop checks that metric instrumentation classes subclass one of the allowed base classes.
+      #
+      # @example
+      #
+      #  # good
+      #  class CountIssues < DatabaseMetric
+      #    # ...
+      #  end
+      #
+      #  # bad
+      #  class CountIssues < BaseMetric
+      #    # ...
+      #  end
+      class InstrumentationSuperclass < RuboCop::Cop::Cop
+        MSG = "Instrumentation classes should subclass one of the following: %{allowed_classes}."
+
+        BASE_PATTERN = "(const nil? !#allowed_class?)"
+
+        def_node_matcher :class_definition, <<~PATTERN
+          (class (const _ !#allowed_class?) #{BASE_PATTERN} ...)
+        PATTERN
+
+        def_node_matcher :class_new_definition, <<~PATTERN
+          [!^(casgn {nil? cbase} #allowed_class? ...)
+           !^^(casgn {nil? cbase} #allowed_class? (block ...))
+           (send (const {nil? cbase} :Class) :new #{BASE_PATTERN})]
+        PATTERN
+
+        def on_class(node)
+          class_definition(node) do
+            register_offense(node.children[1])
+          end
+        end
+
+        def on_send(node)
+          class_new_definition(node) do
+            register_offense(node.children.last)
+          end
+        end
+
+        private
+
+        def allowed_class?(class_name)
+          allowed_classes.include?(class_name)
+        end
+
+        def allowed_classes
+          cop_config['AllowedClasses'] || []
+        end
+
+        def register_offense(offense_node)
+          message = format(MSG, allowed_classes: allowed_classes.join(', '))
+          add_offense(offense_node, message: message)
+        end
+      end
+    end
+  end
+end
diff --git a/rubocop/rubocop-usage-data.yml b/rubocop/rubocop-usage-data.yml
index a03f21e491a..5b88a3349c8 100644
--- a/rubocop/rubocop-usage-data.yml
+++ b/rubocop/rubocop-usage-data.yml
@@ -57,3 +57,11 @@ UsageData/DistinctCountByLargeForeignKey:
     - 'user_id'
     - 'resource_owner_id'
     - 'requirement_id'
+UsageData/InstrumentationSuperclass:
+  Enabled: true
+  Include:
+    - 'lib/gitlab/usage/metrics/instrumentations/**/*.rb'
+  AllowedClasses:
+    - :DatabaseMetric
+    - :GenericMetric
+    - :RedisHLLMetric
diff --git a/spec/features/issues/csv_spec.rb b/spec/features/issues/csv_spec.rb
index d41a41c4383..51e0d54ca5e 100644
--- a/spec/features/issues/csv_spec.rb
+++ b/spec/features/issues/csv_spec.rb
@@ -16,9 +16,7 @@ RSpec.describe 'Issues csv', :js do
 
   def request_csv(params = {})
     visit project_issues_path(project, params)
-    page.within('.nav-controls') do
-      find('[data-testid="export-csv-button"]').click
-    end
+    click_button 'Export as CSV'
     click_on 'Export issues'
   end
 
diff --git a/spec/features/issues/user_resets_their_incoming_email_token_spec.rb b/spec/features/issues/user_resets_their_incoming_email_token_spec.rb
index 2b1c25174c2..9e47639d80f 100644
--- a/spec/features/issues/user_resets_their_incoming_email_token_spec.rb
+++ b/spec/features/issues/user_resets_their_incoming_email_token_spec.rb
@@ -16,11 +16,11 @@ RSpec.describe 'Issues > User resets their incoming email token' do
   end
 
   it 'changes incoming email address token', :js do
-    page.find('[data-testid="issuable-email-modal-btn"]').click
+    click_button 'Email a new issue to this project'
 
     page.within '#issuable-email-modal' do
       previous_token = page.find('input[type="text"]').value
-      page.find('[data-testid="incoming-email-token-reset"]').click
+      click_button 'reset it'
 
       wait_for_requests
 
diff --git a/spec/features/merge_requests/user_exports_as_csv_spec.rb b/spec/features/merge_requests/user_exports_as_csv_spec.rb
index 725b8366d04..351e714b612 100644
--- a/spec/features/merge_requests/user_exports_as_csv_spec.rb
+++ b/spec/features/merge_requests/user_exports_as_csv_spec.rb
@@ -12,15 +12,9 @@ RSpec.describe 'Merge Requests > Exports as CSV', :js do
     visit(project_merge_requests_path(project))
   end
 
-  subject { page.find('.nav-controls') }
-
-  it { is_expected.to have_selector '[data-testid="export-csv-button"]' }
-
   context 'button is clicked' do
     before do
-      page.within('.nav-controls') do
-        find('[data-testid="export-csv-button"]').click
-      end
+      click_button 'Export as CSV'
     end
 
     it 'shows a success message' do
diff --git a/spec/features/projects/settings/user_manages_merge_requests_settings_spec.rb b/spec/features/projects/settings/user_manages_merge_requests_settings_spec.rb
index bf90e86c263..862bae45fc6 100644
--- a/spec/features/projects/settings/user_manages_merge_requests_settings_spec.rb
+++ b/spec/features/projects/settings/user_manages_merge_requests_settings_spec.rb
@@ -116,7 +116,8 @@ RSpec.describe 'Projects > Settings > User manages merge request settings' do
         click_on('Save changes')
       end
 
-      find('.flash-notice')
+      wait_for_all_requests
+
       checkbox = find_field('project_printing_merge_request_link_enabled')
 
       expect(checkbox).not_to be_checked
@@ -139,7 +140,8 @@ RSpec.describe 'Projects > Settings > User manages merge request settings' do
         click_on('Save changes')
       end
 
-      find('.flash-notice')
+      wait_for_all_requests
+
       checkbox = find_field('project_remove_source_branch_after_merge')
 
       expect(checkbox).not_to be_checked
diff --git a/spec/frontend/issuable/components/csv_export_modal_spec.js b/spec/frontend/issuable/components/csv_export_modal_spec.js
index 7eb85a946ae..34094d22e68 100644
--- a/spec/frontend/issuable/components/csv_export_modal_spec.js
+++ b/spec/frontend/issuable/components/csv_export_modal_spec.js
@@ -1,7 +1,6 @@
 import { GlModal, GlIcon, GlButton } from '@gitlab/ui';
 import { mount } from '@vue/test-utils';
 import { stubComponent } from 'helpers/stub_component';
-import { extendedWrapper } from 'helpers/vue_test_utils_helper';
 import CsvExportModal from '~/issuable/components/csv_export_modal.vue';
 
 describe('CsvExportModal', () => {
@@ -9,26 +8,24 @@ describe('CsvExportModal', () => {
 
   function createComponent(options = {}) {
     const { injectedProperties = {}, props = {} } = options;
-    return extendedWrapper(
-      mount(CsvExportModal, {
-        propsData: {
-          modalId: 'csv-export-modal',
-          exportCsvPath: 'export/csv/path',
-          issuableCount: 1,
-          ...props,
-        },
-        provide: {
-          issuableType: 'issues',
-          ...injectedProperties,
-        },
-        stubs: {
-          GlModal: stubComponent(GlModal, {
-            template:
-              '<div><slot name="modal-title"></slot><slot></slot><slot name="modal-footer"></slot></div>',
-          }),
-        },
-      }),
-    );
+    return mount(CsvExportModal, {
+      propsData: {
+        modalId: 'csv-export-modal',
+        exportCsvPath: 'export/csv/path',
+        issuableCount: 1,
+        ...props,
+      },
+      provide: {
+        issuableType: 'issues',
+        ...injectedProperties,
+      },
+      stubs: {
+        GlModal: stubComponent(GlModal, {
+          template:
+            '<div><slot name="modal-title"></slot><slot></slot><slot name="modal-footer"></slot></div>',
+        }),
+      },
+    });
   }
 
   afterEach(() => {
@@ -61,14 +58,13 @@ describe('CsvExportModal', () => {
     describe('issuable count info text', () => {
       it('displays the info text when issuableCount is > -1', () => {
         wrapper = createComponent({ props: { issuableCount: 10 } });
-        expect(wrapper.findByTestId('issuable-count-note').exists()).toBe(true);
-        expect(wrapper.findByTestId('issuable-count-note').text()).toContain('10 issues selected');
+        expect(wrapper.text()).toContain('10 issues selected');
         expect(findIcon().exists()).toBe(true);
       });
 
       it("doesn't display the info text when issuableCount is -1", () => {
         wrapper = createComponent({ props: { issuableCount: -1 } });
-        expect(wrapper.findByTestId('issuable-count-note').exists()).toBe(false);
+        expect(wrapper.text()).not.toContain('issues selected');
       });
     });
 
diff --git a/spec/frontend/issuable/components/csv_import_export_buttons_spec.js b/spec/frontend/issuable/components/csv_import_export_buttons_spec.js
index 2fe8d28a333..118c12d968b 100644
--- a/spec/frontend/issuable/components/csv_import_export_buttons_spec.js
+++ b/spec/frontend/issuable/components/csv_import_export_buttons_spec.js
@@ -1,6 +1,6 @@
-import { shallowMount } from '@vue/test-utils';
+import { GlButton, GlDropdown } from '@gitlab/ui';
 import { createMockDirective, getBinding } from 'helpers/vue_mock_directive';
-import { extendedWrapper } from 'helpers/vue_test_utils_helper';
+import { mountExtended } from 'helpers/vue_test_utils_helper';
 import CsvExportModal from '~/issuable/components/csv_export_modal.vue';
 import CsvImportExportButtons from '~/issuable/components/csv_import_export_buttons.vue';
 import CsvImportModal from '~/issuable/components/csv_import_modal.vue';
@@ -14,35 +14,33 @@ describe('CsvImportExportButtons', () => {
 
   function createComponent(injectedProperties = {}) {
     glModalDirective = jest.fn();
-    return extendedWrapper(
-      shallowMount(CsvImportExportButtons, {
-        directives: {
-          GlTooltip: createMockDirective(),
-          glModal: {
-            bind(_, { value }) {
-              glModalDirective(value);
-            },
+    return mountExtended(CsvImportExportButtons, {
+      directives: {
+        GlTooltip: createMockDirective(),
+        glModal: {
+          bind(_, { value }) {
+            glModalDirective(value);
           },
         },
-        provide: {
-          ...injectedProperties,
-        },
-        propsData: {
-          exportCsvPath,
-          issuableCount,
-        },
-      }),
-    );
+      },
+      provide: {
+        ...injectedProperties,
+      },
+      propsData: {
+        exportCsvPath,
+        issuableCount,
+      },
+    });
   }
 
   afterEach(() => {
     wrapper.destroy();
   });
 
-  const findExportCsvButton = () => wrapper.findByTestId('export-csv-button');
-  const findImportDropdown = () => wrapper.findByTestId('import-csv-dropdown');
-  const findImportCsvButton = () => wrapper.findByTestId('import-csv-dropdown');
-  const findImportFromJiraLink = () => wrapper.findByTestId('import-from-jira-link');
+  const findExportCsvButton = () => wrapper.findComponent(GlButton);
+  const findImportDropdown = () => wrapper.findComponent(GlDropdown);
+  const findImportCsvButton = () => wrapper.findByRole('menuitem', { name: 'Import CSV' });
+  const findImportFromJiraLink = () => wrapper.findByRole('menuitem', { name: 'Import from Jira' });
   const findExportCsvModal = () => wrapper.findComponent(CsvExportModal);
   const findImportCsvModal = () => wrapper.findComponent(CsvImportModal);
 
@@ -97,7 +95,7 @@ describe('CsvImportExportButtons', () => {
         expect(findImportDropdown().exists()).toBe(true);
       });
 
-      it('renders the import button', () => {
+      it('renders the import csv menu item', () => {
         expect(findImportCsvButton().exists()).toBe(true);
       });
 
@@ -106,8 +104,11 @@ describe('CsvImportExportButtons', () => {
           wrapper = createComponent({ showImportButton: true, showLabel: false });
         });
 
-        it('does not have a button text', () => {
-          expect(findImportCsvButton().props('text')).toBe(null);
+        it('hides button text', () => {
+          expect(findImportDropdown().props()).toMatchObject({
+            text: 'Import issues',
+            textSrOnly: true,
+          });
         });
 
         it('import button has a tooltip', () => {
@@ -124,7 +125,10 @@ describe('CsvImportExportButtons', () => {
         });
 
         it('displays a button text', () => {
-          expect(findImportCsvButton().props('text')).toBe('Import issues');
+          expect(findImportDropdown().props()).toMatchObject({
+            text: 'Import issues',
+            textSrOnly: false,
+          });
         });
 
         it('import button has no tooltip', () => {
diff --git a/spec/frontend/issuable/components/csv_import_modal_spec.js b/spec/frontend/issuable/components/csv_import_modal_spec.js
index ce9d738f77b..0c88b6b1283 100644
--- a/spec/frontend/issuable/components/csv_import_modal_spec.js
+++ b/spec/frontend/issuable/components/csv_import_modal_spec.js
@@ -1,8 +1,6 @@
-import { GlModal } from '@gitlab/ui';
-import { getByRole, getByLabelText } from '@testing-library/dom';
-import { mount } from '@vue/test-utils';
+import { GlButton, GlModal } from '@gitlab/ui';
 import { stubComponent } from 'helpers/stub_component';
-import { extendedWrapper } from 'helpers/vue_test_utils_helper';
+import { mountExtended } from 'helpers/vue_test_utils_helper';
 import CsvImportModal from '~/issuable/components/csv_import_modal.vue';
 
 jest.mock('~/lib/utils/csrf', () => ({ token: 'mock-csrf-token' }));
@@ -13,23 +11,21 @@ describe('CsvImportModal', () => {
 
   function createComponent(options = {}) {
     const { injectedProperties = {}, props = {} } = options;
-    return extendedWrapper(
-      mount(CsvImportModal, {
-        propsData: {
-          modalId: 'csv-import-modal',
-          ...props,
-        },
-        provide: {
-          issuableType: 'issues',
-          ...injectedProperties,
-        },
-        stubs: {
-          GlModal: stubComponent(GlModal, {
-            template: '<div><slot></slot><slot name="modal-footer"></slot></div>',
-          }),
-        },
-      }),
-    );
+    return mountExtended(CsvImportModal, {
+      propsData: {
+        modalId: 'csv-import-modal',
+        ...props,
+      },
+      provide: {
+        issuableType: 'issues',
+        ...injectedProperties,
+      },
+      stubs: {
+        GlModal: stubComponent(GlModal, {
+          template: '<div><slot></slot><slot name="modal-footer"></slot></div>',
+        }),
+      },
+    });
   }
 
   beforeEach(() => {
@@ -41,9 +37,9 @@ describe('CsvImportModal', () => {
   });
 
   const findModal = () => wrapper.findComponent(GlModal);
-  const findPrimaryButton = () => getByRole(wrapper.element, 'button', { name: 'Import issues' });
-  const findForm = () => wrapper.findByTestId('import-csv-form');
-  const findFileInput = () => getByLabelText(wrapper.element, 'Upload CSV file');
+  const findPrimaryButton = () => wrapper.findComponent(GlButton);
+  const findForm = () => wrapper.find('form');
+  const findFileInput = () => wrapper.findByLabelText('Upload CSV file');
   const findAuthenticityToken = () => new FormData(findForm().element).get('authenticity_token');
 
   describe('template', () => {
@@ -76,8 +72,8 @@ describe('CsvImportModal', () => {
         expect(findPrimaryButton()).toExist();
       });
 
-      it('submits the form when the primary action is clicked', async () => {
-        findPrimaryButton().click();
+      it('submits the form when the primary action is clicked', () => {
+        findPrimaryButton().trigger('click');
 
         expect(formSubmitSpy).toHaveBeenCalled();
       });
diff --git a/spec/frontend/issuable/components/issuable_by_email_spec.js b/spec/frontend/issuable/components/issuable_by_email_spec.js
index 08a99f29479..f11c41fe25d 100644
--- a/spec/frontend/issuable/components/issuable_by_email_spec.js
+++ b/spec/frontend/issuable/components/issuable_by_email_spec.js
@@ -58,10 +58,11 @@ describe('IssuableByEmail', () => {
     mockAxios.restore();
   });
 
-  const findFormInputGroup = () => wrapper.find(GlFormInputGroup);
+  const findButton = () => wrapper.findComponent(GlButton);
+  const findFormInputGroup = () => wrapper.findComponent(GlFormInputGroup);
 
   const clickResetEmail = async () => {
-    wrapper.findByTestId('incoming-email-token-reset').vm.$emit('click');
+    wrapper.findAllComponents(GlButton).at(2).trigger('click');
 
     await waitForPromises();
   };
@@ -75,14 +76,14 @@ describe('IssuableByEmail', () => {
       'renders a link with "$buttonText" when type is "$issuableType"',
       ({ issuableType, buttonText }) => {
         wrapper = createComponent({ issuableType });
-        expect(wrapper.findByTestId('issuable-email-modal-btn').text()).toBe(buttonText);
+        expect(findButton().text()).toBe(buttonText);
       },
     );
 
     it('opens the modal when the user clicks the button', () => {
       wrapper = createComponent();
 
-      wrapper.findByTestId('issuable-email-modal-btn').vm.$emit('click');
+      findButton().trigger('click');
 
       expect(glModalDirective).toHaveBeenCalled();
     });
@@ -105,7 +106,7 @@ describe('IssuableByEmail', () => {
         initialEmail,
       });
 
-      expect(wrapper.findByTestId('mail-to-btn').attributes('href')).toBe(
+      expect(wrapper.findAllComponents(GlButton).at(1).attributes('href')).toBe(
         `mailto:${initialEmail}?subject=${subject}&body=${body}`,
       );
     });
diff --git a/spec/frontend/issuable/components/status_box_spec.js b/spec/frontend/issuable/components/status_box_spec.js
index 990fac67f7e..9cbf023dbd6 100644
--- a/spec/frontend/issuable/components/status_box_spec.js
+++ b/spec/frontend/issuable/components/status_box_spec.js
@@ -1,4 +1,4 @@
-import { GlSprintf } from '@gitlab/ui';
+import { GlIcon, GlSprintf } from '@gitlab/ui';
 import { shallowMount } from '@vue/test-utils';
 import StatusBox from '~/issuable/components/status_box.vue';
 
@@ -64,7 +64,7 @@ describe('Merge request status box component', () => {
           initialState: testCase.state,
         });
 
-        expect(wrapper.find('[data-testid="status-icon"]').props('name')).toBe(testCase.icon);
+        expect(wrapper.findComponent(GlIcon).props('name')).toBe(testCase.icon);
       });
     });
   });
diff --git a/spec/frontend/lib/utils/url_utility_spec.js b/spec/frontend/lib/utils/url_utility_spec.js
index e12cd8b0e37..8a04e93e88c 100644
--- a/spec/frontend/lib/utils/url_utility_spec.js
+++ b/spec/frontend/lib/utils/url_utility_spec.js
@@ -798,15 +798,29 @@ describe('URL utility', () => {
       );
     });
 
-    it('handles arrays properly', () => {
+    it('adds parameters from arrays', () => {
       const url = 'https://gitlab.com/test';
 
-      expect(urlUtils.setUrlParams({ label_name: ['foo', 'bar'] }, url)).toEqual(
-        'https://gitlab.com/test?label_name=foo&label_name=bar',
+      expect(urlUtils.setUrlParams({ labels: ['foo', 'bar'] }, url)).toEqual(
+        'https://gitlab.com/test?labels=foo&labels=bar',
       );
     });
 
-    it('handles arrays properly when railsArraySyntax=true', () => {
+    it('removes parameters from empty arrays', () => {
+      const url = 'https://gitlab.com/test?labels=foo&labels=bar';
+
+      expect(urlUtils.setUrlParams({ labels: [] }, url)).toEqual('https://gitlab.com/test');
+    });
+
+    it('removes parameters from empty arrays while keeping other parameters', () => {
+      const url = 'https://gitlab.com/test?labels=foo&labels=bar&unrelated=unrelated';
+
+      expect(urlUtils.setUrlParams({ labels: [] }, url)).toEqual(
+        'https://gitlab.com/test?unrelated=unrelated',
+      );
+    });
+
+    it('adds parameters from arrays when railsArraySyntax=true', () => {
       const url = 'https://gitlab.com/test';
 
       expect(urlUtils.setUrlParams({ labels: ['foo', 'bar'] }, url, false, true)).toEqual(
@@ -814,6 +828,14 @@ describe('URL utility', () => {
       );
     });
 
+    it('removes parameters from empty arrays when railsArraySyntax=true', () => {
+      const url = 'https://gitlab.com/test?labels%5B%5D=foo&labels%5B%5D=bar';
+
+      expect(urlUtils.setUrlParams({ labels: [] }, url, false, true)).toEqual(
+        'https://gitlab.com/test',
+      );
+    });
+
     it('decodes URI when decodeURI=true', () => {
       const url = 'https://gitlab.com/test';
 
diff --git a/spec/lib/gitlab/ci/pipeline/chain/validate/external_spec.rb b/spec/lib/gitlab/ci/pipeline/chain/validate/external_spec.rb
index 58ad3d1b4d1..84377981cbc 100644
--- a/spec/lib/gitlab/ci/pipeline/chain/validate/external_spec.rb
+++ b/spec/lib/gitlab/ci/pipeline/chain/validate/external_spec.rb
@@ -43,7 +43,6 @@ RSpec.describe Gitlab::Ci::Pipeline::Chain::Validate::External do
   end
 
   let(:save_incompleted) { true }
-  let(:dot_com) { true }
   let(:command) do
     Gitlab::Ci::Pipeline::Chain::Command.new(
       project: project, current_user: user, yaml_processor_result: yaml_processor_result, save_incompleted: save_incompleted
@@ -57,7 +56,6 @@ RSpec.describe Gitlab::Ci::Pipeline::Chain::Validate::External do
 
     before do
       stub_env('EXTERNAL_VALIDATION_SERVICE_URL', validation_service_url)
-      allow(Gitlab).to receive(:com?).and_return(dot_com)
       allow(Labkit::Correlation::CorrelationId).to receive(:current_id).and_return('correlation-id')
     end
 
@@ -199,34 +197,6 @@ RSpec.describe Gitlab::Ci::Pipeline::Chain::Validate::External do
       end
     end
 
-    context 'when not on .com' do
-      let(:dot_com) { false }
-
-      before do
-        stub_request(:post, validation_service_url).to_return(status: 404, body: "{}")
-      end
-
-      it 'drops the pipeline' do
-        perform!
-
-        expect(pipeline.status).to eq('failed')
-        expect(pipeline).to be_persisted
-        expect(pipeline.errors.to_a).to include('External validation failed')
-      end
-
-      it 'breaks the chain' do
-        perform!
-
-        expect(step.break?).to be true
-      end
-
-      it 'logs the authorization' do
-        expect(Gitlab::AppLogger).to receive(:info).with(message: 'Pipeline not authorized', project_id: project.id, user_id: user.id)
-
-        perform!
-      end
-    end
-
     context 'when validation returns 406 Not Acceptable' do
       before do
         stub_request(:post, validation_service_url).to_return(status: 406, body: "{}")
diff --git a/spec/lib/gitlab/cluster/mixins/unicorn_http_server_spec.rb b/spec/lib/gitlab/cluster/mixins/unicorn_http_server_spec.rb
deleted file mode 100644
index 7f7c95b2527..00000000000
--- a/spec/lib/gitlab/cluster/mixins/unicorn_http_server_spec.rb
+++ /dev/null
@@ -1,117 +0,0 @@
-# frozen_string_literal: true
-
-require 'spec_helper'
-
-# For easier debugging set `UNICORN_DEBUG=1`
-
-RSpec.describe Gitlab::Cluster::Mixins::UnicornHttpServer do
-  before do
-    stub_const('UNICORN_STARTUP_TIMEOUT', 30)
-  end
-
-  context 'when running Unicorn' do
-    using RSpec::Parameterized::TableSyntax
-
-    where(:signal, :exitstatus, :termsig) do
-      # executes phased restart block
-      :USR2 | 140 | nil
-      :QUIT | 140 | nil
-
-      # does not execute phased restart block
-      :INT | 0 | nil
-      :TERM | 0 | nil
-    end
-
-    with_them do
-      it 'properly handles process lifecycle' do
-        with_unicorn(workers: 1) do |pid|
-          Process.kill(signal, pid)
-
-          child_pid, child_status = Process.wait2(pid)
-          expect(child_pid).to eq(pid)
-          expect(child_status.exitstatus).to eq(exitstatus)
-          expect(child_status.termsig).to eq(termsig)
-        end
-      end
-    end
-  end
-
-  private
-
-  def with_unicorn(workers:, timeout: UNICORN_STARTUP_TIMEOUT)
-    with_unicorn_configs(workers: workers) do |unicorn_rb, config_ru|
-      cmdline = [
-        "bundle", "exec", "unicorn",
-        "-I", Rails.root.to_s,
-        "-c", unicorn_rb,
-        config_ru
-      ]
-
-      IO.popen(cmdline) do |process|
-        # wait for process to start:
-        # I, [2019-10-15T13:21:27.565225 #3089]  INFO -- : master process ready
-        wait_for_output(process, /master process ready/, timeout: timeout)
-        consume_output(process)
-
-        yield(process.pid)
-      ensure
-        begin
-          Process.kill(:KILL, process.pid)
-        rescue Errno::ESRCH
-        end
-      end
-    end
-  end
-
-  def with_unicorn_configs(workers:)
-    Dir.mktmpdir do |dir|
-      File.write "#{dir}/unicorn.rb", <<-EOF
-        require './lib/gitlab/cluster/lifecycle_events'
-        require './lib/gitlab/cluster/mixins/unicorn_http_server'
-
-        worker_processes #{workers}
-        listen "127.0.0.1:0"
-        preload_app true
-
-        Unicorn::HttpServer.prepend(#{described_class})
-
-        mutex = Mutex.new
-
-        Gitlab::Cluster::LifecycleEvents.on_before_blackout_period do
-          mutex.synchronize do
-            exit(140)
-          end
-        end
-
-        # redirect stderr to stdout
-        $stderr.reopen($stdout)
-      EOF
-
-      File.write "#{dir}/config.ru", <<-EOF
-        run -> (env) { [404, {}, ['']] }
-      EOF
-
-      yield("#{dir}/unicorn.rb", "#{dir}/config.ru")
-    end
-  end
-
-  def wait_for_output(process, output, timeout:)
-    Timeout.timeout(timeout) do
-      loop do
-        line = process.readline
-        puts "UNICORN_DEBUG: #{line}" if ENV['UNICORN_DEBUG']
-        break if line =~ output
-      end
-    end
-  end
-
-  def consume_output(process)
-    Thread.new do
-      loop do
-        line = process.readline
-        puts "UNICORN_DEBUG: #{line}" if ENV['UNICORN_DEBUG']
-      end
-    rescue StandardError
-    end
-  end
-end
diff --git a/spec/lib/gitlab/health_checks/unicorn_check_spec.rb b/spec/lib/gitlab/health_checks/unicorn_check_spec.rb
deleted file mode 100644
index 1cc44016002..00000000000
--- a/spec/lib/gitlab/health_checks/unicorn_check_spec.rb
+++ /dev/null
@@ -1,67 +0,0 @@
-# frozen_string_literal: true
-
-require 'spec_helper'
-
-RSpec.describe Gitlab::HealthChecks::UnicornCheck do
-  let(:result_class) { Gitlab::HealthChecks::Result }
-  let(:readiness) { described_class.readiness }
-  let(:metrics) { described_class.metrics }
-
-  before do
-    described_class.clear_memoization(:http_servers)
-  end
-
-  shared_examples 'with state' do |(state, message)|
-    it "does provide readiness" do
-      expect(readiness).to eq(result_class.new('unicorn_check', state, message))
-    end
-
-    it "does provide metrics" do
-      expect(metrics).to include(
-        an_object_having_attributes(name: 'unicorn_check_success', value: state ? 1 : 0))
-      expect(metrics).to include(
-        an_object_having_attributes(name: 'unicorn_check_latency_seconds', value: be >= 0))
-    end
-  end
-
-  context 'when Unicorn is not loaded' do
-    before do
-      allow(Gitlab::Runtime).to receive(:unicorn?).and_return(false)
-      hide_const('Unicorn')
-    end
-
-    it "does not provide readiness and metrics" do
-      expect(readiness).to be_nil
-      expect(metrics).to be_nil
-    end
-  end
-
-  context 'when Unicorn is loaded' do
-    let(:http_server_class) { Struct.new(:worker_processes) }
-
-    before do
-      allow(Gitlab::Runtime).to receive(:unicorn?).and_return(true)
-      stub_const('Unicorn::HttpServer', http_server_class)
-    end
-
-    context 'when no servers are running' do
-      it_behaves_like 'with state', [false, 'unexpected Unicorn check result: 0']
-    end
-
-    context 'when servers without workers are running' do
-      before do
-        http_server_class.new(0)
-      end
-
-      it_behaves_like 'with state', [false, 'unexpected Unicorn check result: 0']
-    end
-
-    context 'when servers with workers are running' do
-      before do
-        http_server_class.new(1)
-      end
-
-      it_behaves_like 'with state', true
-    end
-  end
-end
diff --git a/spec/rubocop/cop/usage_data/instrumentation_superclass_spec.rb b/spec/rubocop/cop/usage_data/instrumentation_superclass_spec.rb
new file mode 100644
index 00000000000..31324331e61
--- /dev/null
+++ b/spec/rubocop/cop/usage_data/instrumentation_superclass_spec.rb
@@ -0,0 +1,64 @@
+# frozen_string_literal: true
+
+require 'fast_spec_helper'
+
+require_relative '../../../../rubocop/cop/usage_data/instrumentation_superclass'
+
+RSpec.describe RuboCop::Cop::UsageData::InstrumentationSuperclass do
+  let(:allowed_classes) { %i[GenericMetric DatabaseMetric RedisHllMetric] }
+  let(:msg) { "Instrumentation classes should subclass one of the following: #{allowed_classes.join(', ')}." }
+
+  let(:config) do
+    RuboCop::Config.new('UsageData/InstrumentationSuperclass' => {
+                          'AllowedClasses' => allowed_classes
+                        })
+  end
+
+  subject(:cop) { described_class.new(config) }
+
+  context 'with class definition' do
+    context 'when inheriting from allowed superclass' do
+      it 'does not register an offense' do
+        expect_no_offenses('class NewMetric < GenericMetric; end')
+      end
+    end
+
+    context 'when inheriting from some other superclass' do
+      it 'registers an offense' do
+        expect_offense(<<~CODE)
+          class NewMetric < BaseMetric; end
+                            ^^^^^^^^^^ #{msg}
+        CODE
+      end
+    end
+
+    context 'when not inheriting' do
+      it 'does not register an offense' do
+        expect_no_offenses('class NewMetric; end')
+      end
+    end
+  end
+
+  context 'with dynamic class definition' do
+    context 'when inheriting from allowed superclass' do
+      it 'does not register an offense' do
+        expect_no_offenses('NewMetric = Class.new(GenericMetric)')
+      end
+    end
+
+    context 'when inheriting from some other superclass' do
+      it 'registers an offense' do
+        expect_offense(<<~CODE)
+          NewMetric = Class.new(BaseMetric)
+                                ^^^^^^^^^^ #{msg}
+        CODE
+      end
+    end
+
+    context 'when not inheriting' do
+      it 'does not register an offense' do
+        expect_no_offenses('NewMetric = Class.new')
+      end
+    end
+  end
+end
diff --git a/yarn.lock b/yarn.lock
index ef7d8021ca9..031b2001f93 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -908,10 +908,10 @@
   resolved "https://registry.yarnpkg.com/@gitlab/tributejs/-/tributejs-1.0.0.tgz#672befa222aeffc83e7d799b0500a7a4418e59b8"
   integrity sha512-nmKw1+hB6MHvlmPz63yPwVs1qQkycHwsKgxpEbzmky16Y6mL4EJMk3w1b8QlOAF/AIAzjCERPhe/R4MJiohbZw==
 
-"@gitlab/ui@29.27.0":
-  version "29.27.0"
-  resolved "https://registry.yarnpkg.com/@gitlab/ui/-/ui-29.27.0.tgz#c5cbe1fee2164705ea6a431c85f6fdaa2ff7e166"
-  integrity sha512-VoiYrozWyE9l/ddX308vsu+wQqaJJN3csngIlrJit3DzVZV9Z/OVWU/X9CWV8m/ubyr5ysEMqnrtnsQClR9FiA==
+"@gitlab/ui@29.28.0":
+  version "29.28.0"
+  resolved "https://registry.yarnpkg.com/@gitlab/ui/-/ui-29.28.0.tgz#3444f6d26114f503d78b85fca67b5cc340a4a667"
+  integrity sha512-7jHqbnEy3P5J/G0/b+Nu+iw8XSOyTWLvyOEtNdFpBras1RxCE3C4AnPyGT7jei+WafTQN2Vzxz8VIgAxZ6PPvg==
   dependencies:
     "@babel/standalone" "^7.0.0"
     "@gitlab/vue-toasted" "^1.3.0"