diff --git a/app/assets/javascripts/ide/stores/mutations.js b/app/assets/javascripts/ide/stores/mutations.js
index 2587b57a817..e84e2782e46 100644
--- a/app/assets/javascripts/ide/stores/mutations.js
+++ b/app/assets/javascripts/ide/stores/mutations.js
@@ -73,16 +73,15 @@ export default {
       const entry = data.entries[key];
       const foundEntry = state.entries[key];
 
+      // NOTE: We can't clone `entry` in any of the below assignments because
+      // we need `state.entries` and the `entry.tree` to reference the same object.
       if (!foundEntry) {
         Object.assign(state.entries, {
           [key]: entry,
         });
       } else if (foundEntry.deleted) {
         Object.assign(state.entries, {
-          [key]: {
-            ...entry,
-            replaces: true,
-          },
+          [key]: Object.assign(entry, { replaces: true }),
         });
       } else {
         const tree = entry.tree.filter(
diff --git a/app/assets/javascripts/registry/components/app.vue b/app/assets/javascripts/registry/components/app.vue
index 7ae06af02cf..a20bae9e37e 100644
--- a/app/assets/javascripts/registry/components/app.vue
+++ b/app/assets/javascripts/registry/components/app.vue
@@ -15,15 +15,19 @@ export default {
     GlLoadingIcon,
   },
   props: {
-    endpoint: {
-      type: String,
-      required: true,
-    },
     characterError: {
       type: Boolean,
       required: false,
       default: false,
     },
+    containersErrorImage: {
+      type: String,
+      required: true,
+    },
+    endpoint: {
+      type: String,
+      required: true,
+    },
     helpPagePath: {
       type: String,
       required: true,
@@ -32,7 +36,11 @@ export default {
       type: String,
       required: true,
     },
-    containersErrorImage: {
+    personalAccessTokensHelpLink: {
+      type: String,
+      required: true,
+    },
+    registryHostUrlWithPort: {
       type: String,
       required: true,
     },
@@ -40,6 +48,10 @@ export default {
       type: String,
       required: true,
     },
+    twoFactorAuthHelpLink: {
+      type: String,
+      required: true,
+    },
   },
   store,
   computed: {
@@ -79,6 +91,26 @@ export default {
         false,
       );
     },
+    notLoggedInToRegistryText() {
+      return sprintf(
+        s__(`ContainerRegistry|If you are not already logged in, you need to authenticate to
+             the Container Registry by using your GitLab username and password. If you have
+             %{twofaDocLinkStart}Two-Factor Authentication%{twofaDocLinkEnd} enabled, use a
+             %{personalAccessTokensDocLinkStart}Personal Access Token
+             %{personalAccessTokensDocLinkEnd}instead of a password.`),
+        {
+          twofaDocLinkStart: `<a href="${this.twoFactorAuthHelpLink}" target="_blank">`,
+          twofaDocLinkEnd: '</a>',
+          personalAccessTokensDocLinkStart: `<a href="${this.personalAccessTokensHelpLink}" target="_blank">`,
+          personalAccessTokensDocLinkEnd: '</a>',
+        },
+        false,
+      );
+    },
+    dockerLoginCommand() {
+      // eslint-disable-next-line @gitlab/i18n/no-non-i18n-strings
+      return `docker login ${this.registryHostUrlWithPort}`;
+    },
     dockerBuildCommand() {
       // eslint-disable-next-line @gitlab/i18n/no-non-i18n-strings
       return `docker build -t ${this.repositoryUrl} .`;
@@ -130,6 +162,17 @@ export default {
       <template #description>
         <p class="js-no-container-images-text" v-html="noContainerImagesText"></p>
         <h5>{{ s__('ContainerRegistry|Quick Start') }}</h5>
+        <p class="js-not-logged-in-to-registry-text" v-html="notLoggedInToRegistryText"></p>
+        <div class="input-group append-bottom-10">
+          <input :value="dockerLoginCommand" type="text" class="form-control monospace" readonly />
+          <span class="input-group-append">
+            <clipboard-button
+              :text="dockerLoginCommand"
+              :title="s__('ContainerRegistry|Copy login command')"
+              class="input-group-text"
+            />
+          </span>
+        </div>
         <p>
           {{
             s__(
diff --git a/app/assets/javascripts/registry/index.js b/app/assets/javascripts/registry/index.js
index d8daec29fda..38c3d67042c 100644
--- a/app/assets/javascripts/registry/index.js
+++ b/app/assets/javascripts/registry/index.js
@@ -13,23 +13,29 @@ export default () =>
     data() {
       const { dataset } = document.querySelector(this.$options.el);
       return {
-        endpoint: dataset.endpoint,
         characterError: Boolean(dataset.characterError),
+        containersErrorImage: dataset.containersErrorImage,
+        endpoint: dataset.endpoint,
         helpPagePath: dataset.helpPagePath,
         noContainersImage: dataset.noContainersImage,
-        containersErrorImage: dataset.containersErrorImage,
+        personalAccessTokensHelpLink: dataset.personalAccessTokensHelpLink,
+        registryHostUrlWithPort: dataset.registryHostUrlWithPort,
         repositoryUrl: dataset.repositoryUrl,
+        twoFactorAuthHelpLink: dataset.twoFactorAuthHelpLink,
       };
     },
     render(createElement) {
       return createElement('registry-app', {
         props: {
-          endpoint: this.endpoint,
           characterError: this.characterError,
+          containersErrorImage: this.containersErrorImage,
+          endpoint: this.endpoint,
           helpPagePath: this.helpPagePath,
           noContainersImage: this.noContainersImage,
-          containersErrorImage: this.containersErrorImage,
+          personalAccessTokensHelpLink: this.personalAccessTokensHelpLink,
+          registryHostUrlWithPort: this.registryHostUrlWithPort,
           repositoryUrl: this.repositoryUrl,
+          twoFactorAuthHelpLink: this.twoFactorAuthHelpLink,
         },
       });
     },
diff --git a/app/assets/javascripts/vue_merge_request_widget/components/mr_collapsible_extension.vue b/app/assets/javascripts/vue_merge_request_widget/components/mr_collapsible_extension.vue
index ae1d9368008..36f291e995c 100644
--- a/app/assets/javascripts/vue_merge_request_widget/components/mr_collapsible_extension.vue
+++ b/app/assets/javascripts/vue_merge_request_widget/components/mr_collapsible_extension.vue
@@ -39,9 +39,6 @@ export default {
     ariaLabel() {
       return this.isCollapsed ? __('Expand') : __('Collapse');
     },
-    isButtonDisabled() {
-      return this.isLoading || this.hasError;
-    },
   },
   methods: {
     toggleCollapsed() {
@@ -53,25 +50,35 @@ export default {
 <template>
   <div>
     <div class="mr-widget-extension d-flex align-items-center pl-3">
-      <gl-button
-        class="btn-blank btn s32 square append-right-default"
-        :aria-label="ariaLabel"
-        :disabled="isButtonDisabled"
-        @click="toggleCollapsed"
-      >
-        <gl-loading-icon v-if="isLoading" />
-        <icon v-else :name="arrowIconName" class="js-icon" />
-      </gl-button>
-      <gl-button
-        variant="link"
-        class="js-title"
-        :disabled="isButtonDisabled"
-        :class="{ 'border-0': isButtonDisabled }"
-        @click="toggleCollapsed"
-      >
-        <template v-if="isCollapsed">{{ title }}</template>
-        <template v-else>{{ __('Collapse') }}</template>
-      </gl-button>
+      <div v-if="hasError" class="ci-widget media">
+        <div class="media-body">
+          <span class="gl-font-size-small mr-widget-margin-left gl-line-height-24 js-error-state">{{
+            title
+          }}</span>
+        </div>
+      </div>
+
+      <template v-else>
+        <gl-button
+          class="btn-blank btn s32 square append-right-default"
+          :aria-label="ariaLabel"
+          :disabled="isLoading"
+          @click="toggleCollapsed"
+        >
+          <gl-loading-icon v-if="isLoading" />
+          <icon v-else :name="arrowIconName" class="js-icon" />
+        </gl-button>
+        <gl-button
+          variant="link"
+          class="js-title"
+          :disabled="isLoading"
+          :class="{ 'border-0': isLoading }"
+          @click="toggleCollapsed"
+        >
+          <template v-if="isCollapsed">{{ title }}</template>
+          <template v-else>{{ __('Collapse') }}</template>
+        </gl-button>
+      </template>
     </div>
 
     <div v-if="!isCollapsed" class="border-top js-slot-container">
diff --git a/app/assets/stylesheets/framework/common.scss b/app/assets/stylesheets/framework/common.scss
index 370fc84e492..4b89a2f2b04 100644
--- a/app/assets/stylesheets/framework/common.scss
+++ b/app/assets/stylesheets/framework/common.scss
@@ -560,3 +560,6 @@ img.emoji {
     }
   }
 }
+
+.gl-font-size-small { font-size: $gl-font-size-small; }
+.gl-line-height-24 { line-height: $gl-line-height-24; }
diff --git a/app/assets/stylesheets/framework/variables.scss b/app/assets/stylesheets/framework/variables.scss
index f352ee33535..dfc39d8e03b 100644
--- a/app/assets/stylesheets/framework/variables.scss
+++ b/app/assets/stylesheets/framework/variables.scss
@@ -833,6 +833,7 @@ Merge Requests
 */
 $mr-tabs-height: 48px;
 $mr-version-controls-height: 56px;
+$mr-widget-margin-left: 40px;
 
 /*
 Compare Branches
diff --git a/app/assets/stylesheets/pages/merge_requests.scss b/app/assets/stylesheets/pages/merge_requests.scss
index e6feded1d4f..971f3b2c308 100644
--- a/app/assets/stylesheets/pages/merge_requests.scss
+++ b/app/assets/stylesheets/pages/merge_requests.scss
@@ -19,6 +19,8 @@
   border-top: 1px solid $border-color;
 }
 
+.mr-widget-margin-left { margin-left: $mr-widget-margin-left; }
+
 .media-section {
   @include media-breakpoint-down(md) {
     align-items: flex-start;
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 5c2420e80f2..ecaeb7060c8 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -108,6 +108,11 @@ module ApplicationHelper
     Gitlab.config.extra
   end
 
+  # shortcut for gitlab registry config
+  def registry_config
+    Gitlab.config.registry
+  end
+
   # Render a `time` element with Javascript-based relative date and tooltip
   #
   # time       - Time object
diff --git a/app/models/container_repository.rb b/app/models/container_repository.rb
index 583e23d1274..253f74e9811 100644
--- a/app/models/container_repository.rb
+++ b/app/models/container_repository.rb
@@ -67,7 +67,7 @@ class ContainerRepository < ApplicationRecord
   def delete_tags!
     return unless has_tags?
 
-    digests = tags.map { |tag| tag.digest }.to_set
+    digests = tags.map { |tag| tag.digest }.compact.to_set
 
     digests.all? do |digest|
       delete_tag_by_digest(digest)
diff --git a/app/services/projects/container_repository/delete_tags_service.rb b/app/services/projects/container_repository/delete_tags_service.rb
index 22656b29c58..5129e2269a8 100644
--- a/app/services/projects/container_repository/delete_tags_service.rb
+++ b/app/services/projects/container_repository/delete_tags_service.rb
@@ -48,10 +48,10 @@ module Projects
         # rubocop: disable CodeReuse/ActiveRecord
         Gitlab::Sentry.track_exception(ArgumentError.new('multiple tag digests')) if tag_digests.many?
 
-        # deletes the dummy image
-        # all created tag digests are the same since they all have the same dummy image.
+        # Deletes the dummy image
+        # All created tag digests are the same since they all have the same dummy image.
         # a single delete is sufficient to remove all tags with it
-        if container_repository.client.delete_repository_tag(container_repository.path, tag_digests.first)
+        if container_repository.delete_tag_by_digest(tag_digests.first)
           success(deleted: tag_names)
         else
           error('could not delete tags')
diff --git a/app/views/projects/registry/repositories/index.html.haml b/app/views/projects/registry/repositories/index.html.haml
index ddb19cb6b65..b2e160e37bc 100644
--- a/app/views/projects/registry/repositories/index.html.haml
+++ b/app/views/projects/registry/repositories/index.html.haml
@@ -5,7 +5,10 @@
     .col-12
       #js-vue-registry-images{ data: { endpoint: project_container_registry_index_path(@project, format: :json),
         "help_page_path" => help_page_path('user/packages/container_registry/index'),
+        "two_factor_auth_help_link" => help_page_path('user/profile/account/two_factor_authentication'),
+        "personal_access_tokens_help_link" => help_page_path('user/profile/personal_access_tokens'),
         "no_containers_image" => image_path('illustrations/docker-empty-state.svg'),
         "containers_error_image" => image_path('illustrations/docker-error-state.svg'),
         "repository_url" => escape_once(@project.container_registry_url),
+        "registry_host_url_with_port" => escape_once(registry_config.host_port),
         character_error: @character_error.to_s } }
diff --git a/app/views/shared/_allow_request_access.html.haml b/app/views/shared/_allow_request_access.html.haml
index 2b24bde9e59..ca82f2f3377 100644
--- a/app/views/shared/_allow_request_access.html.haml
+++ b/app/views/shared/_allow_request_access.html.haml
@@ -3,6 +3,4 @@
 .form-check
   = form.check_box :request_access_enabled, class: 'form-check-input', data: { qa_selector: 'request_access_checkbox' }
   = form.label :request_access_enabled, class: 'form-check-label' do
-    %span{ class: label_class }= _('Allow users to request access')
-    %br
-    %span.text-muted= _('Allow users to request access if visibility is public or internal.')
+    %span{ class: label_class }= _('Allow users to request access (if visibility is public or internal)')
diff --git a/changelogs/unreleased/18217-request-access-to-project-should-be-on-by-default.yml b/changelogs/unreleased/18217-request-access-to-project-should-be-on-by-default.yml
new file mode 100644
index 00000000000..3fb1b874e77
--- /dev/null
+++ b/changelogs/unreleased/18217-request-access-to-project-should-be-on-by-default.yml
@@ -0,0 +1,5 @@
+---
+title: Enable Request Access functionality by default for new projects and groups
+merge_request: 17662
+author:
+type: changed
diff --git a/changelogs/unreleased/29881-fix-ide-delete-and-readd.yml b/changelogs/unreleased/29881-fix-ide-delete-and-readd.yml
new file mode 100644
index 00000000000..91445ca791b
--- /dev/null
+++ b/changelogs/unreleased/29881-fix-ide-delete-and-readd.yml
@@ -0,0 +1,5 @@
+---
+title: Fix Web IDE tree not updating modified status
+merge_request: 18647
+author:
+type: fixed
diff --git a/changelogs/unreleased/feature-add-copyable-login-with-copy-to-empty-container-registry-view.yml b/changelogs/unreleased/feature-add-copyable-login-with-copy-to-empty-container-registry-view.yml
new file mode 100644
index 00000000000..6d7a773120b
--- /dev/null
+++ b/changelogs/unreleased/feature-add-copyable-login-with-copy-to-empty-container-registry-view.yml
@@ -0,0 +1,5 @@
+---
+title: Adds login input with copy box and supporting copy to empty container registry view
+merge_request: 18244
+author: nate geslin
+type: added
diff --git a/changelogs/unreleased/issue_11240.yml b/changelogs/unreleased/issue_11240.yml
new file mode 100644
index 00000000000..751440d1e8c
--- /dev/null
+++ b/changelogs/unreleased/issue_11240.yml
@@ -0,0 +1,5 @@
+---
+title: Expose subscribed attribute for epic on API
+merge_request: 18475
+author:
+type: added
diff --git a/config/initializers/7_prometheus_metrics.rb b/config/initializers/7_prometheus_metrics.rb
index c5cd055f4ff..d58fb54f71c 100644
--- a/config/initializers/7_prometheus_metrics.rb
+++ b/config/initializers/7_prometheus_metrics.rb
@@ -34,6 +34,12 @@ Sidekiq.configure_server do |config|
   config.on(:startup) do
     # webserver metrics are cleaned up in config.ru: `warmup` block
     Prometheus::CleanupMultiprocDirService.new.execute
+    # In production, sidekiq is run in a multi-process setup where processes might interfere
+    # with each other cleaning up and reinitializing prometheus database files, which is why
+    # we're re-doing the work every time here.
+    # A cleaner solution would be to run the cleanup pre-fork, and the initialization once
+    # after all workers have forked, but I don't know how at this point.
+    ::Prometheus::Client.reinitialize_on_pid_change(force: true)
 
     Gitlab::Metrics::Exporter::SidekiqExporter.instance.start
   end
diff --git a/db/migrate/20190925055714_default_request_access_groups.rb b/db/migrate/20190925055714_default_request_access_groups.rb
new file mode 100644
index 00000000000..ba3efbe56f4
--- /dev/null
+++ b/db/migrate/20190925055714_default_request_access_groups.rb
@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+class DefaultRequestAccessGroups < ActiveRecord::Migration[5.2]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def up
+    change_column_default :namespaces, :request_access_enabled, true
+  end
+
+  def down
+    change_column_default :namespaces, :request_access_enabled, false
+  end
+end
diff --git a/db/migrate/20190925055902_default_request_access_projects.rb b/db/migrate/20190925055902_default_request_access_projects.rb
new file mode 100644
index 00000000000..3ad88d0963d
--- /dev/null
+++ b/db/migrate/20190925055902_default_request_access_projects.rb
@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+class DefaultRequestAccessProjects < ActiveRecord::Migration[5.2]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def up
+    change_column_default :projects, :request_access_enabled, true
+  end
+
+  def down
+    change_column_default :projects, :request_access_enabled, false
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index b9952cfc12d..c860fed7bbc 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -2333,7 +2333,7 @@ ActiveRecord::Schema.define(version: 2019_10_04_133612) do
     t.boolean "membership_lock", default: false
     t.boolean "share_with_group_lock", default: false
     t.integer "visibility_level", default: 20, null: false
-    t.boolean "request_access_enabled", default: false, null: false
+    t.boolean "request_access_enabled", default: true, null: false
     t.string "ldap_sync_status", default: "ready", null: false
     t.string "ldap_sync_error"
     t.datetime "ldap_sync_last_update_at"
@@ -2922,7 +2922,7 @@ ActiveRecord::Schema.define(version: 2019_10_04_133612) do
     t.boolean "has_external_issue_tracker"
     t.string "repository_storage", default: "default", null: false
     t.boolean "repository_read_only"
-    t.boolean "request_access_enabled", default: false, null: false
+    t.boolean "request_access_enabled", default: true, null: false
     t.boolean "has_external_wiki"
     t.string "ci_config_path"
     t.boolean "lfs_enabled"
diff --git a/doc/api/epics.md b/doc/api/epics.md
index c24df6a236f..a5ec42a2a41 100644
--- a/doc/api/epics.md
+++ b/doc/api/epics.md
@@ -147,7 +147,8 @@ Example response:
   "closed_at": "2018-08-18T12:22:05.239Z",
   "labels": [],
   "upvotes": 4,
-  "downvotes": 0
+  "downvotes": 0,
+  "subscribed": true
 }
 ```
 
diff --git a/lib/container_registry/client.rb b/lib/container_registry/client.rb
index 2bd8eb65306..92861c567a8 100644
--- a/lib/container_registry/client.rb
+++ b/lib/container_registry/client.rb
@@ -36,7 +36,9 @@ module ContainerRegistry
     end
 
     def delete_repository_tag(name, reference)
-      faraday.delete("/v2/#{name}/manifests/#{reference}").success?
+      result = faraday.delete("/v2/#{name}/manifests/#{reference}")
+
+      result.success? || result.status == 404
     end
 
     def upload_raw_blob(path, blob)
@@ -84,7 +86,9 @@ module ContainerRegistry
     end
 
     def delete_blob(name, digest)
-      faraday.delete("/v2/#{name}/blobs/#{digest}").success?
+      result = faraday.delete("/v2/#{name}/blobs/#{digest}")
+
+      result.success? || result.status == 404
     end
 
     def put_tag(name, reference, manifest)
diff --git a/lib/gitlab/health_checks/gitaly_check.rb b/lib/gitlab/health_checks/gitaly_check.rb
index f5f142c251f..e780bf8a986 100644
--- a/lib/gitlab/health_checks/gitaly_check.rb
+++ b/lib/gitlab/health_checks/gitaly_check.rb
@@ -5,7 +5,7 @@ module Gitlab
     class GitalyCheck
       extend BaseAbstractCheck
 
-      METRIC_PREFIX = 'gitaly_health_check'
+      METRIC_PREFIX = 'gitaly_health_check'.freeze
 
       class << self
         def readiness
diff --git a/lib/gitlab/health_checks/probes/readiness.rb b/lib/gitlab/health_checks/probes/readiness.rb
index b789cbe1ae6..28abf490ffc 100644
--- a/lib/gitlab/health_checks/probes/readiness.rb
+++ b/lib/gitlab/health_checks/probes/readiness.rb
@@ -6,10 +6,10 @@ module Gitlab
       class Readiness
         attr_reader :checks
 
-        # This accepts an array of Proc
+        # This accepts an array of objects implementing `:readiness`
         # that returns `::Gitlab::HealthChecks::Result`
         def initialize(*additional_checks)
-          @checks = ::Gitlab::HealthChecks::CHECKS.map { |check| check.method(:readiness) }
+          @checks = ::Gitlab::HealthChecks::CHECKS
           @checks += additional_checks
         end
 
@@ -43,7 +43,7 @@ module Gitlab
 
         def probe_readiness
           checks
-            .flat_map(&:call)
+            .flat_map(&:readiness)
             .compact
             .group_by(&:name)
         end
diff --git a/lib/gitlab/health_checks/puma_check.rb b/lib/gitlab/health_checks/puma_check.rb
new file mode 100644
index 00000000000..7aafe29fbae
--- /dev/null
+++ b/lib/gitlab/health_checks/puma_check.rb
@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module HealthChecks
+    # This check can only be run on Puma `master` process
+    class PumaCheck
+      extend SimpleAbstractCheck
+
+      class << self
+        private
+
+        def metric_prefix
+          'puma_check'
+        end
+
+        def successful?(result)
+          result > 0
+        end
+
+        def check
+          return unless defined?(::Puma)
+
+          stats = Puma.stats
+          stats = JSON.parse(stats)
+
+          # If `workers` is missing this means that
+          # Puma server is running in single mode
+          stats.fetch('workers', 1)
+        rescue NoMethodError
+          # server is not ready
+          0
+        end
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/health_checks/simple_abstract_check.rb b/lib/gitlab/health_checks/simple_abstract_check.rb
index 959f28791c3..4e0b9296819 100644
--- a/lib/gitlab/health_checks/simple_abstract_check.rb
+++ b/lib/gitlab/health_checks/simple_abstract_check.rb
@@ -7,6 +7,8 @@ module Gitlab
 
       def readiness
         check_result = check
+        return if check_result.nil?
+
         if successful?(check_result)
           HealthChecks::Result.new(name, true)
         elsif check_result.is_a?(Timeout::Error)
@@ -20,6 +22,8 @@ module Gitlab
 
       def metrics
         result, elapsed = with_timing(&method(:check))
+        return if result.nil?
+
         Rails.logger.error("#{human_name} check returned unexpected result #{result}") unless successful?(result) # rubocop:disable Gitlab/RailsLogger
         [
           metric("#{metric_prefix}_timeout", result.is_a?(Timeout::Error) ? 1 : 0),
diff --git a/lib/gitlab/health_checks/unicorn_check.rb b/lib/gitlab/health_checks/unicorn_check.rb
new file mode 100644
index 00000000000..a30ae015257
--- /dev/null
+++ b/lib/gitlab/health_checks/unicorn_check.rb
@@ -0,0 +1,41 @@
+# 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) # rubocop: disable CodeReuse/ActiveRecord
+        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 defined?(::Unicorn::HttpServer)
+
+            ObjectSpace.each_object(::Unicorn::HttpServer).to_a
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/metrics/exporter/base_exporter.rb b/lib/gitlab/metrics/exporter/base_exporter.rb
index 3aac18f59c6..13483e437d8 100644
--- a/lib/gitlab/metrics/exporter/base_exporter.rb
+++ b/lib/gitlab/metrics/exporter/base_exporter.rb
@@ -6,6 +6,8 @@ module Gitlab
       class BaseExporter < Daemon
         attr_reader :server
 
+        attr_accessor :additional_checks
+
         def enabled?
           settings.enabled
         end
@@ -32,12 +34,10 @@ module Gitlab
             Port: settings.port, BindAddress: settings.address,
             Logger: logger, AccessLog: access_log)
           server.mount_proc '/readiness' do |req, res|
-            render_probe(
-              ::Gitlab::HealthChecks::Probes::Readiness.new, req, res)
+            render_probe(readiness_probe, req, res)
           end
           server.mount_proc '/liveness' do |req, res|
-            render_probe(
-              ::Gitlab::HealthChecks::Probes::Liveness.new, req, res)
+            render_probe(liveness_probe, req, res)
           end
           server.mount '/', Rack::Handler::WEBrick, rack_app
 
@@ -52,8 +52,10 @@ module Gitlab
 
         def stop_working
           if server
+            # we close sockets if thread is not longer running
+            # this happens, when the process forks
+            server.listeners.each(&:close) unless thread.alive?
             server.shutdown
-            server.listeners.each(&:close)
           end
 
           @server = nil
@@ -67,6 +69,14 @@ module Gitlab
           end
         end
 
+        def readiness_probe
+          ::Gitlab::HealthChecks::Probes::Readiness.new(*additional_checks)
+        end
+
+        def liveness_probe
+          ::Gitlab::HealthChecks::Probes::Liveness.new
+        end
+
         def render_probe(probe, req, res)
           result = probe.execute
 
diff --git a/lib/gitlab/metrics/exporter/web_exporter.rb b/lib/gitlab/metrics/exporter/web_exporter.rb
index fac7043352a..f4b42759fb9 100644
--- a/lib/gitlab/metrics/exporter/web_exporter.rb
+++ b/lib/gitlab/metrics/exporter/web_exporter.rb
@@ -7,6 +7,16 @@ module Gitlab
   module Metrics
     module Exporter
       class WebExporter < BaseExporter
+        # This exporter is always run on master process
+        def initialize
+          super
+
+          self.additional_checks = [
+            Gitlab::HealthChecks::PumaCheck,
+            Gitlab::HealthChecks::UnicornCheck
+          ]
+        end
+
         def settings
           Settings.monitoring.web_exporter
         end
diff --git a/locale/gitlab.pot b/locale/gitlab.pot
index 0741e0445a6..d8c5a934542 100644
--- a/locale/gitlab.pot
+++ b/locale/gitlab.pot
@@ -1413,10 +1413,7 @@ msgstr ""
 msgid "Allow users to register any application to use GitLab as an OAuth provider"
 msgstr ""
 
-msgid "Allow users to request access"
-msgstr ""
-
-msgid "Allow users to request access if visibility is public or internal."
+msgid "Allow users to request access (if visibility is public or internal)"
 msgstr ""
 
 msgid "Allowed email domain restriction only permitted for top-level groups"
@@ -4352,12 +4349,18 @@ msgstr ""
 msgid "ContainerRegistry|Copy build command"
 msgstr ""
 
+msgid "ContainerRegistry|Copy login command"
+msgstr ""
+
 msgid "ContainerRegistry|Copy push command"
 msgstr ""
 
 msgid "ContainerRegistry|Docker connection error"
 msgstr ""
 
+msgid "ContainerRegistry|If you are not already logged in, you need to authenticate to the Container Registry by using your GitLab username and password. If you have %{twofaDocLinkStart}Two-Factor Authentication%{twofaDocLinkEnd} enabled, use a %{personalAccessTokensDocLinkStart}Personal Access Token %{personalAccessTokensDocLinkEnd}instead of a password."
+msgstr ""
+
 msgid "ContainerRegistry|Last Updated"
 msgstr ""
 
diff --git a/scripts/review_apps/base-config.yaml b/scripts/review_apps/base-config.yaml
index de5e14af4d4..1dc79e6d45e 100644
--- a/scripts/review_apps/base-config.yaml
+++ b/scripts/review_apps/base-config.yaml
@@ -153,7 +153,8 @@ redis:
 redis-ha:
   enabled: false
 registry:
-  minReplicas: 1
+  hpa:
+    minReplicas: 1
   resources:
     requests:
       cpu: 50m
diff --git a/spec/controllers/groups/group_members_controller_spec.rb b/spec/controllers/groups/group_members_controller_spec.rb
index 0c3dd971582..22f970133e3 100644
--- a/spec/controllers/groups/group_members_controller_spec.rb
+++ b/spec/controllers/groups/group_members_controller_spec.rb
@@ -6,7 +6,7 @@ describe Groups::GroupMembersController do
   include ExternalAuthorizationServiceHelpers
 
   let(:user)  { create(:user) }
-  let(:group) { create(:group, :public, :access_requestable) }
+  let(:group) { create(:group, :public) }
   let(:membership) { create(:group_member, group: group) }
 
   describe 'GET index' do
diff --git a/spec/controllers/projects/project_members_controller_spec.rb b/spec/controllers/projects/project_members_controller_spec.rb
index 5130e26c928..2f473d395ad 100644
--- a/spec/controllers/projects/project_members_controller_spec.rb
+++ b/spec/controllers/projects/project_members_controller_spec.rb
@@ -4,7 +4,7 @@ require('spec_helper')
 
 describe Projects::ProjectMembersController do
   let(:user) { create(:user) }
-  let(:project) { create(:project, :public, :access_requestable) }
+  let(:project) { create(:project, :public) }
 
   describe 'GET index' do
     it 'has the project_members address with a 200 status code' do
diff --git a/spec/factories/groups.rb b/spec/factories/groups.rb
index ba1a4883f85..93c01f8034d 100644
--- a/spec/factories/groups.rb
+++ b/spec/factories/groups.rb
@@ -32,8 +32,8 @@ FactoryBot.define do
       avatar { fixture_file_upload('spec/fixtures/dk.png') }
     end
 
-    trait :access_requestable do
-      request_access_enabled { true }
+    trait :request_access_disabled do
+      request_access_enabled { false }
     end
 
     trait :nested do
diff --git a/spec/factories/projects.rb b/spec/factories/projects.rb
index ae1feb73e4d..9477eeb18d4 100644
--- a/spec/factories/projects.rb
+++ b/spec/factories/projects.rb
@@ -117,8 +117,8 @@ FactoryBot.define do
       storage_version { nil }
     end
 
-    trait :access_requestable do
-      request_access_enabled { true }
+    trait :request_access_disabled do
+      request_access_enabled { false }
     end
 
     trait :with_avatar do
diff --git a/spec/features/groups/members/master_manages_access_requests_spec.rb b/spec/features/groups/members/master_manages_access_requests_spec.rb
index 454da126c81..1c13bd3d59e 100644
--- a/spec/features/groups/members/master_manages_access_requests_spec.rb
+++ b/spec/features/groups/members/master_manages_access_requests_spec.rb
@@ -4,7 +4,7 @@ require 'spec_helper'
 
 describe 'Groups > Members > Maintainer manages access requests' do
   it_behaves_like 'Maintainer manages access requests' do
-    let(:entity) { create(:group, :public, :access_requestable) }
+    let(:entity) { create(:group, :public) }
     let(:members_page_path) { group_group_members_path(entity) }
   end
 end
diff --git a/spec/features/groups/members/request_access_spec.rb b/spec/features/groups/members/request_access_spec.rb
index 0d5321709ae..5f22af3529c 100644
--- a/spec/features/groups/members/request_access_spec.rb
+++ b/spec/features/groups/members/request_access_spec.rb
@@ -5,7 +5,7 @@ require 'spec_helper'
 describe 'Groups > Members > Request access' do
   let(:user) { create(:user) }
   let(:owner) { create(:user) }
-  let(:group) { create(:group, :public, :access_requestable) }
+  let(:group) { create(:group, :public) }
   let!(:project) { create(:project, :private, namespace: group) }
 
   before do
diff --git a/spec/features/projects/members/group_members_spec.rb b/spec/features/projects/members/group_members_spec.rb
index dd5fc82e058..4ecc3db78b3 100644
--- a/spec/features/projects/members/group_members_spec.rb
+++ b/spec/features/projects/members/group_members_spec.rb
@@ -5,8 +5,8 @@ require 'spec_helper'
 describe 'Projects members' do
   let(:user) { create(:user) }
   let(:developer) { create(:user) }
-  let(:group) { create(:group, :public, :access_requestable) }
-  let(:project) { create(:project, :public, :access_requestable, creator: user, group: group) }
+  let(:group) { create(:group, :public) }
+  let(:project) { create(:project, :public, creator: user, group: group) }
   let(:project_invitee) { create(:project_member, project: project, invite_token: '123', invite_email: 'test1@abc.com', user: nil) }
   let(:group_invitee) { create(:group_member, group: group, invite_token: '123', invite_email: 'test2@abc.com', user: nil) }
   let(:project_requester) { create(:user) }
diff --git a/spec/features/projects/members/group_requester_cannot_request_access_to_project_spec.rb b/spec/features/projects/members/group_requester_cannot_request_access_to_project_spec.rb
index fb4238f0a1f..ecd55f71c84 100644
--- a/spec/features/projects/members/group_requester_cannot_request_access_to_project_spec.rb
+++ b/spec/features/projects/members/group_requester_cannot_request_access_to_project_spec.rb
@@ -5,8 +5,8 @@ require 'spec_helper'
 describe 'Projects > Members > Group requester cannot request access to project', :js do
   let(:user) { create(:user) }
   let(:owner) { create(:user) }
-  let(:group) { create(:group, :public, :access_requestable) }
-  let(:project) { create(:project, :public, :access_requestable, namespace: group) }
+  let(:group) { create(:group, :public) }
+  let(:project) { create(:project, :public, namespace: group) }
 
   before do
     group.add_owner(owner)
diff --git a/spec/features/projects/members/master_manages_access_requests_spec.rb b/spec/features/projects/members/master_manages_access_requests_spec.rb
index 17d6efbcaa5..f113fb643f8 100644
--- a/spec/features/projects/members/master_manages_access_requests_spec.rb
+++ b/spec/features/projects/members/master_manages_access_requests_spec.rb
@@ -4,7 +4,7 @@ require 'spec_helper'
 
 describe 'Projects > Members > Maintainer manages access requests' do
   it_behaves_like 'Maintainer manages access requests' do
-    let(:entity) { create(:project, :public, :access_requestable) }
+    let(:entity) { create(:project, :public) }
     let(:members_page_path) { project_project_members_path(entity) }
   end
 end
diff --git a/spec/features/projects/members/user_requests_access_spec.rb b/spec/features/projects/members/user_requests_access_spec.rb
index 9f7327cd6e4..a77f0bdcbe9 100644
--- a/spec/features/projects/members/user_requests_access_spec.rb
+++ b/spec/features/projects/members/user_requests_access_spec.rb
@@ -4,7 +4,7 @@ require 'spec_helper'
 
 describe 'Projects > Members > User requests access', :js do
   let(:user) { create(:user) }
-  let(:project) { create(:project, :public, :access_requestable, :repository) }
+  let(:project) { create(:project, :public, :repository) }
   let(:maintainer) { project.owner }
 
   before do
diff --git a/spec/finders/access_requests_finder_spec.rb b/spec/finders/access_requests_finder_spec.rb
index 4c67087b50f..fbfc8035bcc 100644
--- a/spec/finders/access_requests_finder_spec.rb
+++ b/spec/finders/access_requests_finder_spec.rb
@@ -7,13 +7,13 @@ describe AccessRequestsFinder do
   let(:access_requester) { create(:user) }
 
   let(:project) do
-    create(:project, :public, :access_requestable) do |project|
+    create(:project, :public) do |project|
       project.request_access(access_requester)
     end
   end
 
   let(:group) do
-    create(:group, :public, :access_requestable) do |group|
+    create(:group, :public) do |group|
       group.request_access(access_requester)
     end
   end
diff --git a/spec/finders/group_members_finder_spec.rb b/spec/finders/group_members_finder_spec.rb
index 12f92f6b5b0..08f3b4024b3 100644
--- a/spec/finders/group_members_finder_spec.rb
+++ b/spec/finders/group_members_finder_spec.rb
@@ -4,7 +4,7 @@ require 'spec_helper'
 
 describe GroupMembersFinder, '#execute' do
   let(:group)        { create(:group) }
-  let(:nested_group) { create(:group, :access_requestable, parent: group) }
+  let(:nested_group) { create(:group, parent: group) }
   let(:user1)        { create(:user) }
   let(:user2)        { create(:user) }
   let(:user3)        { create(:user) }
diff --git a/spec/finders/members_finder_spec.rb b/spec/finders/members_finder_spec.rb
index 9849808c255..f9b8fee6f2d 100644
--- a/spec/finders/members_finder_spec.rb
+++ b/spec/finders/members_finder_spec.rb
@@ -4,7 +4,7 @@ require 'spec_helper'
 
 describe MembersFinder, '#execute' do
   set(:group)        { create(:group) }
-  set(:nested_group) { create(:group, :access_requestable, parent: group) }
+  set(:nested_group) { create(:group, parent: group) }
   set(:project)      { create(:project, namespace: nested_group) }
   set(:user1)        { create(:user) }
   set(:user2)        { create(:user) }
@@ -57,7 +57,7 @@ describe MembersFinder, '#execute' do
   context 'when include_invited_groups_members == true' do
     subject { described_class.new(project, user2).execute(include_invited_groups_members: true) }
 
-    set(:linked_group) { create(:group, :public, :access_requestable) }
+    set(:linked_group) { create(:group, :public) }
     set(:nested_linked_group) { create(:group, parent: linked_group) }
     set(:linked_group_member) { linked_group.add_guest(user1) }
     set(:nested_linked_group_member) { nested_linked_group.add_guest(user2) }
diff --git a/spec/frontend/ide/stores/integration_spec.js b/spec/frontend/ide/stores/integration_spec.js
new file mode 100644
index 00000000000..443de18f288
--- /dev/null
+++ b/spec/frontend/ide/stores/integration_spec.js
@@ -0,0 +1,100 @@
+import { decorateFiles } from '~/ide/lib/files';
+import { createStore } from '~/ide/stores';
+
+const TEST_BRANCH = 'test_branch';
+const TEST_NAMESPACE = 'test_namespace';
+const TEST_PROJECT_ID = `${TEST_NAMESPACE}/test_project`;
+const TEST_PATH_DIR = 'src';
+const TEST_PATH = `${TEST_PATH_DIR}/foo.js`;
+const TEST_CONTENT = `Lorem ipsum dolar sit
+Lorem ipsum dolar
+Lorem ipsum
+Lorem
+`;
+
+jest.mock('~/ide/ide_router');
+
+describe('IDE store integration', () => {
+  let store;
+
+  beforeEach(() => {
+    store = createStore();
+    store.replaceState({
+      ...store.state,
+      projects: {
+        [TEST_PROJECT_ID]: {
+          web_url: 'test_web_url',
+          branches: [],
+        },
+      },
+      currentProjectId: TEST_PROJECT_ID,
+      currentBranchId: TEST_BRANCH,
+    });
+  });
+
+  describe('with project and files', () => {
+    beforeEach(() => {
+      const { entries, treeList } = decorateFiles({
+        data: [`${TEST_PATH_DIR}/`, TEST_PATH, 'README.md'],
+        projectId: TEST_PROJECT_ID,
+        branchId: TEST_BRANCH,
+      });
+
+      Object.assign(entries[TEST_PATH], {
+        raw: TEST_CONTENT,
+      });
+
+      store.replaceState({
+        ...store.state,
+        trees: {
+          [`${TEST_PROJECT_ID}/${TEST_BRANCH}`]: {
+            tree: treeList,
+          },
+        },
+        entries,
+      });
+    });
+
+    describe('when a file is deleted and readded', () => {
+      beforeEach(() => {
+        store.dispatch('deleteEntry', TEST_PATH);
+        store.dispatch('createTempEntry', { name: TEST_PATH, type: 'blob' });
+      });
+
+      it('has changed and staged', () => {
+        expect(store.state.changedFiles).toEqual([
+          expect.objectContaining({
+            path: TEST_PATH,
+            tempFile: true,
+            deleted: false,
+          }),
+        ]);
+
+        expect(store.state.stagedFiles).toEqual([
+          expect.objectContaining({
+            path: TEST_PATH,
+            deleted: true,
+          }),
+        ]);
+      });
+
+      it('cleans up after commit', () => {
+        const expected = expect.objectContaining({
+          path: TEST_PATH,
+          staged: false,
+          changed: false,
+          tempFile: false,
+          deleted: false,
+        });
+        store.dispatch('stageChange', TEST_PATH);
+
+        store.dispatch('commit/updateFilesAfterCommit', { data: {} });
+
+        expect(store.state.entries[TEST_PATH]).toEqual(expected);
+        expect(store.state.entries[TEST_PATH_DIR].tree.find(x => x.path === TEST_PATH)).toEqual(
+          expected,
+        );
+      });
+    });
+  });
+});
diff --git a/spec/frontend/registry/components/app_spec.js b/spec/frontend/registry/components/app_spec.js
index 190af5c11cd..5dcb61e03b5 100644
--- a/spec/frontend/registry/components/app_spec.js
+++ b/spec/frontend/registry/components/app_spec.js
@@ -1,5 +1,5 @@
-import registry from '~/registry/components/app.vue';
 import { mount } from '@vue/test-utils';
+import registry from '~/registry/components/app.vue';
 import { TEST_HOST } from '../../helpers/test_constants';
 import { reposServerResponse, parsedReposServerResponse } from '../mock_data';
 
@@ -8,6 +8,7 @@ describe('Registry List', () => {
 
   const findCollapsibleContainer = w => w.findAll({ name: 'CollapsibeContainerRegisty' });
   const findNoContainerImagesText = w => w.find('.js-no-container-images-text');
+  const findNotLoggedInToRegistryText = w => w.find('.js-not-logged-in-to-registry-text');
   const findSpinner = w => w.find('.gl-spinner');
   const findCharacterErrorText = w => w.find('.js-character-error-text');
 
@@ -17,6 +18,9 @@ describe('Registry List', () => {
     noContainersImage: 'foo',
     containersErrorImage: 'foo',
     repositoryUrl: 'foo',
+    registryHostUrlWithPort: 'foo',
+    personalAccessTokensHelpLink: 'foo',
+    twoFactorAuthHelpLink: 'foo',
   };
 
   const setMainEndpoint = jest.fn();
@@ -67,6 +71,13 @@ describe('Registry List', () => {
         'With the Container Registry, every project can have its own space to store its Docker images. More Information',
       );
     });
+
+    it('should render login help text', () => {
+      const notLoggedInToRegistryText = findNotLoggedInToRegistryText(localWrapper);
+      expect(notLoggedInToRegistryText.text()).toEqual(
+        'If you are not already logged in, you need to authenticate to the Container Registry by using your GitLab username and password. If you have Two-Factor Authentication enabled, use a Personal Access Token instead of a password.',
+      );
+    });
   });
 
   describe('while loading data', () => {
diff --git a/spec/frontend/vue_mr_widget/components/artifacts_list_app_spec.js b/spec/frontend/vue_mr_widget/components/artifacts_list_app_spec.js
index 49ed796d9a8..7d593a77bf3 100644
--- a/spec/frontend/vue_mr_widget/components/artifacts_list_app_spec.js
+++ b/spec/frontend/vue_mr_widget/components/artifacts_list_app_spec.js
@@ -44,6 +44,7 @@ describe('Merge Requests Artifacts list app', () => {
 
   const findButtons = () => wrapper.findAll('button');
   const findTitle = () => wrapper.find('.js-title');
+  const findErrorMessage = () => wrapper.find('.js-error-state');
   const findTableRows = () => wrapper.findAll('tbody tr');
 
   describe('while loading', () => {
@@ -109,13 +110,12 @@ describe('Merge Requests Artifacts list app', () => {
     });
 
     it('renders the error state', () => {
-      expect(findTitle().text()).toBe('An error occurred while fetching the artifacts');
+      expect(findErrorMessage().text()).toBe('An error occurred while fetching the artifacts');
     });
 
-    it('renders disabled buttons', () => {
+    it('does not render buttons', () => {
       const buttons = findButtons();
-      expect(buttons.at(0).attributes('disabled')).toBe('disabled');
-      expect(buttons.at(1).attributes('disabled')).toBe('disabled');
+      expect(buttons.exists()).toBe(false);
     });
   });
 });
diff --git a/spec/frontend/vue_mr_widget/components/mr_collapsible_extension_spec.js b/spec/frontend/vue_mr_widget/components/mr_collapsible_extension_spec.js
index 4c9507223a1..ee107f297ef 100644
--- a/spec/frontend/vue_mr_widget/components/mr_collapsible_extension_spec.js
+++ b/spec/frontend/vue_mr_widget/components/mr_collapsible_extension_spec.js
@@ -20,6 +20,7 @@ describe('Merge Request Collapsible Extension', () => {
   };
 
   const findTitle = () => wrapper.find('.js-title');
+  const findErrorMessage = () => wrapper.find('.js-error-state');
 
   afterEach(() => {
     wrapper.destroy();
@@ -87,19 +88,12 @@ describe('Merge Request Collapsible Extension', () => {
       mountComponent(Object.assign({}, data, { hasError: true }));
     });
 
-    it('renders the buttons disabled', () => {
-      expect(
-        wrapper
-          .findAll('button')
-          .at(0)
-          .attributes('disabled'),
-      ).toEqual('disabled');
-      expect(
-        wrapper
-          .findAll('button')
-          .at(1)
-          .attributes('disabled'),
-      ).toEqual('disabled');
+    it('does not render the buttons', () => {
+      expect(wrapper.findAll('button').exists()).toBe(false);
+    });
+
+    it('renders title message provided', () => {
+      expect(findErrorMessage().text()).toBe(data.title);
     });
   });
 });
diff --git a/spec/helpers/members_helper_spec.rb b/spec/helpers/members_helper_spec.rb
index e52d2166a69..169c8707bf4 100644
--- a/spec/helpers/members_helper_spec.rb
+++ b/spec/helpers/members_helper_spec.rb
@@ -5,11 +5,11 @@ require 'spec_helper'
 describe MembersHelper do
   describe '#remove_member_message' do
     let(:requester) { create(:user) }
-    let(:project) { create(:project, :public, :access_requestable) }
+    let(:project) { create(:project, :public) }
     let(:project_member) { build(:project_member, project: project) }
     let(:project_member_invite) { build(:project_member, project: project).tap { |m| m.generate_invite_token! } }
     let(:project_member_request) { project.request_access(requester) }
-    let(:group) { create(:group, :access_requestable) }
+    let(:group) { create(:group) }
     let(:group_member) { build(:group_member, group: group) }
     let(:group_member_invite) { build(:group_member, group: group).tap { |m| m.generate_invite_token! } }
     let(:group_member_request) { group.request_access(requester) }
@@ -26,10 +26,10 @@ describe MembersHelper do
 
   describe '#remove_member_title' do
     let(:requester) { create(:user) }
-    let(:project) { create(:project, :public, :access_requestable) }
+    let(:project) { create(:project, :public) }
     let(:project_member) { build(:project_member, project: project) }
     let(:project_member_request) { project.request_access(requester) }
-    let(:group) { create(:group, :access_requestable) }
+    let(:group) { create(:group) }
     let(:group_member) { build(:group_member, group: group) }
     let(:group_member_request) { group.request_access(requester) }
 
diff --git a/spec/lib/gitlab/health_checks/puma_check_spec.rb b/spec/lib/gitlab/health_checks/puma_check_spec.rb
new file mode 100644
index 00000000000..71b6386b174
--- /dev/null
+++ b/spec/lib/gitlab/health_checks/puma_check_spec.rb
@@ -0,0 +1,65 @@
+require 'spec_helper'
+
+describe Gitlab::HealthChecks::PumaCheck do
+  let(:result_class) { Gitlab::HealthChecks::Result }
+  let(:readiness) { described_class.readiness }
+  let(:metrics) { described_class.metrics }
+
+  shared_examples 'with state' do |(state, message)|
+    it "does provide readiness" do
+      expect(readiness).to eq(result_class.new('puma_check', state, message))
+    end
+
+    it "does provide metrics" do
+      expect(metrics).to include(
+        an_object_having_attributes(name: 'puma_check_success', value: state ? 1 : 0))
+      expect(metrics).to include(
+        an_object_having_attributes(name: 'puma_check_latency_seconds', value: be >= 0))
+    end
+  end
+
+  context 'when Puma is not loaded' do
+    before do
+      hide_const('Puma')
+    end
+
+    it "does not provide readiness and metrics" do
+      expect(readiness).to be_nil
+      expect(metrics).to be_nil
+    end
+  end
+
+  context 'when Puma is loaded' do
+    before do
+      stub_const('Puma', Module.new)
+    end
+
+    context 'when stats are missing' do
+      before do
+        expect(Puma).to receive(:stats).and_raise(NoMethodError)
+      end
+
+      it_behaves_like 'with state', [false, 'unexpected Puma check result: 0']
+    end
+
+    context 'for Single mode' do
+      before do
+        expect(Puma).to receive(:stats) do
+          '{}'
+        end
+      end
+
+      it_behaves_like 'with state', true
+    end
+
+    context 'for Cluster mode' do
+      before do
+        expect(Puma).to receive(:stats) do
+          '{"workers":2}'
+        end
+      end
+
+      it_behaves_like 'with state', true
+    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
new file mode 100644
index 00000000000..c02d0c37738
--- /dev/null
+++ b/spec/lib/gitlab/health_checks/unicorn_check_spec.rb
@@ -0,0 +1,63 @@
+require 'spec_helper'
+
+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
+      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
+      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/lib/gitlab/metrics/exporter/base_exporter_spec.rb b/spec/lib/gitlab/metrics/exporter/base_exporter_spec.rb
index bedf4fedcfa..0376da13595 100644
--- a/spec/lib/gitlab/metrics/exporter/base_exporter_spec.rb
+++ b/spec/lib/gitlab/metrics/exporter/base_exporter_spec.rb
@@ -64,6 +64,18 @@ describe Gitlab::Metrics::Exporter::BaseExporter do
             exporter.start.join
           end
         end
+
+        describe 'when thread is not alive' do
+          it 'does close listeners' do
+            expect_any_instance_of(::WEBrick::HTTPServer).to receive(:start)
+            expect_any_instance_of(::WEBrick::HTTPServer).to receive(:listeners)
+              .and_call_original
+
+            expect { exporter.start.join }.to change { exporter.thread? }.from(false).to(true)
+
+            exporter.stop
+          end
+        end
       end
 
       describe '#stop' do
diff --git a/spec/mailers/notify_spec.rb b/spec/mailers/notify_spec.rb
index 56fa26d5f23..1991bac0229 100644
--- a/spec/mailers/notify_spec.rb
+++ b/spec/mailers/notify_spec.rb
@@ -714,7 +714,7 @@ describe Notify do
 
     describe 'project access requested' do
       let(:project) do
-        create(:project, :public, :access_requestable) do |project|
+        create(:project, :public) do |project|
           project.add_maintainer(project.owner)
         end
       end
@@ -743,7 +743,7 @@ describe Notify do
     end
 
     describe 'project access denied' do
-      let(:project) { create(:project, :public, :access_requestable) }
+      let(:project) { create(:project, :public) }
       let(:project_member) do
         project.request_access(user)
         project.requesters.find_by(user_id: user.id)
@@ -765,7 +765,7 @@ describe Notify do
 
     describe 'project access changed' do
       let(:owner) { create(:user, name: "Chang O'Keefe") }
-      let(:project) { create(:project, :public, :access_requestable, namespace: owner.namespace) }
+      let(:project) { create(:project, :public, namespace: owner.namespace) }
       let(:project_member) { create(:project_member, project: project, user: user) }
       subject { described_class.member_access_granted_email('project', project_member.id) }
 
@@ -1167,7 +1167,7 @@ describe Notify do
 
   context 'for a group' do
     describe 'group access requested' do
-      let(:group) { create(:group, :public, :access_requestable) }
+      let(:group) { create(:group, :public) }
       let(:group_member) do
         group.request_access(user)
         group.requesters.find_by(user_id: user.id)
diff --git a/spec/models/ci/build_metadata_spec.rb b/spec/models/ci/build_metadata_spec.rb
index 67cd939b4c6..da95a2d30f5 100644
--- a/spec/models/ci/build_metadata_spec.rb
+++ b/spec/models/ci/build_metadata_spec.rb
@@ -4,7 +4,7 @@ require 'spec_helper'
 
 describe Ci::BuildMetadata do
   set(:user) { create(:user) }
-  set(:group) { create(:group, :access_requestable) }
+  set(:group) { create(:group) }
   set(:project) { create(:project, :repository, group: group, build_timeout: 2000) }
 
   set(:pipeline) do
diff --git a/spec/models/ci/build_spec.rb b/spec/models/ci/build_spec.rb
index 15281c9e826..26646085921 100644
--- a/spec/models/ci/build_spec.rb
+++ b/spec/models/ci/build_spec.rb
@@ -4,7 +4,7 @@ require 'spec_helper'
 
 describe Ci::Build do
   set(:user) { create(:user) }
-  set(:group) { create(:group, :access_requestable) }
+  set(:group) { create(:group) }
   set(:project) { create(:project, :repository, group: group) }
 
   set(:pipeline) do
diff --git a/spec/models/concerns/access_requestable_spec.rb b/spec/models/concerns/access_requestable_spec.rb
index de2bc3a387b..5c1694e3737 100644
--- a/spec/models/concerns/access_requestable_spec.rb
+++ b/spec/models/concerns/access_requestable_spec.rb
@@ -5,7 +5,7 @@ require 'spec_helper'
 describe AccessRequestable do
   describe 'Group' do
     describe '#request_access' do
-      let(:group) { create(:group, :public, :access_requestable) }
+      let(:group) { create(:group, :public) }
       let(:user) { create(:user) }
 
       it { expect(group.request_access(user)).to be_a(GroupMember) }
@@ -13,7 +13,7 @@ describe AccessRequestable do
     end
 
     describe '#access_requested?' do
-      let(:group) { create(:group, :public, :access_requestable) }
+      let(:group) { create(:group, :public) }
       let(:user) { create(:user) }
 
       before do
@@ -26,14 +26,14 @@ describe AccessRequestable do
 
   describe 'Project' do
     describe '#request_access' do
-      let(:project) { create(:project, :public, :access_requestable) }
+      let(:project) { create(:project, :public) }
       let(:user) { create(:user) }
 
       it { expect(project.request_access(user)).to be_a(ProjectMember) }
     end
 
     describe '#access_requested?' do
-      let(:project) { create(:project, :public, :access_requestable) }
+      let(:project) { create(:project, :public) }
       let(:user) { create(:user) }
 
       before do
diff --git a/spec/models/group_spec.rb b/spec/models/group_spec.rb
index 3f149f9d7ee..892c31a9204 100644
--- a/spec/models/group_spec.rb
+++ b/spec/models/group_spec.rb
@@ -3,7 +3,7 @@
 require 'spec_helper'
 
 describe Group do
-  let!(:group) { create(:group, :access_requestable) }
+  let!(:group) { create(:group) }
 
   describe 'associations' do
     it { is_expected.to have_many :projects }
@@ -331,7 +331,7 @@ describe Group do
   end
 
   describe '#avatar_url' do
-    let!(:group) { create(:group, :access_requestable, :with_avatar) }
+    let!(:group) { create(:group, :with_avatar) }
     let(:user) { create(:user) }
 
     context 'when avatar file is uploaded' do
diff --git a/spec/models/member_spec.rb b/spec/models/member_spec.rb
index 2cb4f222ea4..e7f03226826 100644
--- a/spec/models/member_spec.rb
+++ b/spec/models/member_spec.rb
@@ -92,7 +92,7 @@ describe Member do
 
   describe 'Scopes & finders' do
     before do
-      project = create(:project, :public, :access_requestable)
+      project = create(:project, :public)
       group = create(:group)
       @owner_user = create(:user).tap { |u| group.add_owner(u) }
       @owner = group.members.find_by(user_id: @owner_user.id)
@@ -230,7 +230,7 @@ describe Member do
   describe '.add_user' do
     %w[project group].each do |source_type|
       context "when source is a #{source_type}" do
-        let!(:source) { create(source_type, :public, :access_requestable) }
+        let!(:source) { create(source_type, :public) }
         let!(:user) { create(:user) }
         let!(:admin) { create(:admin) }
 
@@ -437,7 +437,7 @@ describe Member do
   describe '.add_users' do
     %w[project group].each do |source_type|
       context "when source is a #{source_type}" do
-        let!(:source) { create(source_type, :public, :access_requestable) }
+        let!(:source) { create(source_type, :public) }
         let!(:admin) { create(:admin) }
         let(:user1) { create(:user) }
         let(:user2) { create(:user) }
diff --git a/spec/models/project_spec.rb b/spec/models/project_spec.rb
index 68833fdaf73..866003c9ffd 100644
--- a/spec/models/project_spec.rb
+++ b/spec/models/project_spec.rb
@@ -153,7 +153,7 @@ describe Project do
     end
 
     describe '#members & #requesters' do
-      let(:project) { create(:project, :public, :access_requestable) }
+      let(:project) { create(:project, :public) }
       let(:requester) { create(:user) }
       let(:developer) { create(:user) }
       before do
diff --git a/spec/models/project_team_spec.rb b/spec/models/project_team_spec.rb
index 77c88a04cde..d62fa58739a 100644
--- a/spec/models/project_team_spec.rb
+++ b/spec/models/project_team_spec.rb
@@ -141,7 +141,7 @@ describe ProjectTeam do
   describe '#find_member' do
     context 'personal project' do
       let(:project) do
-        create(:project, :public, :access_requestable)
+        create(:project, :public)
       end
 
       let(:requester) { create(:user) }
@@ -161,7 +161,7 @@ describe ProjectTeam do
     end
 
     context 'group project' do
-      let(:group) { create(:group, :access_requestable) }
+      let(:group) { create(:group) }
       let(:project) { create(:project, group: group) }
       let(:requester) { create(:user) }
 
@@ -246,7 +246,7 @@ describe ProjectTeam do
 
     context 'personal project' do
       let(:project) do
-        create(:project, :public, :access_requestable)
+        create(:project, :public)
       end
 
       context 'when project is not shared with group' do
@@ -292,7 +292,7 @@ describe ProjectTeam do
     end
 
     context 'group project' do
-      let(:group) { create(:group, :access_requestable) }
+      let(:group) { create(:group) }
       let!(:project) do
         create(:project, group: group)
       end
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
index 12292dad142..24e66fe14c3 100644
--- a/spec/models/user_spec.rb
+++ b/spec/models/user_spec.rb
@@ -79,7 +79,7 @@ describe User do
     describe '#group_members' do
       it 'does not include group memberships for which user is a requester' do
         user = create(:user)
-        group = create(:group, :public, :access_requestable)
+        group = create(:group, :public)
         group.request_access(user)
 
         expect(user.group_members).to be_empty
@@ -89,7 +89,7 @@ describe User do
     describe '#project_members' do
       it 'does not include project memberships for which user is a requester' do
         user = create(:user)
-        project = create(:project, :public, :access_requestable)
+        project = create(:project, :public)
         project.request_access(user)
 
         expect(user.project_members).to be_empty
@@ -1191,7 +1191,7 @@ describe User do
   end
 
   describe '.without_projects' do
-    let!(:project) { create(:project, :public, :access_requestable) }
+    let!(:project) { create(:project, :public) }
     let!(:user) { create(:user) }
     let!(:user_without_project) { create(:user) }
     let!(:user_without_project2) { create(:user) }
diff --git a/spec/requests/api/access_requests_spec.rb b/spec/requests/api/access_requests_spec.rb
index 1af6602ea9e..100f3d33c7b 100644
--- a/spec/requests/api/access_requests_spec.rb
+++ b/spec/requests/api/access_requests_spec.rb
@@ -7,7 +7,7 @@ describe API::AccessRequests do
   set(:stranger) { create(:user) }
 
   set(:project) do
-    create(:project, :public, :access_requestable, creator_id: maintainer.id, namespace: maintainer.namespace) do |project|
+    create(:project, :public, creator_id: maintainer.id, namespace: maintainer.namespace) do |project|
       project.add_developer(developer)
       project.add_maintainer(maintainer)
       project.request_access(access_requester)
@@ -15,7 +15,7 @@ describe API::AccessRequests do
   end
 
   set(:group) do
-    create(:group, :public, :access_requestable) do |group|
+    create(:group, :public) do |group|
       group.add_developer(developer)
       group.add_owner(maintainer)
       group.request_access(access_requester)
diff --git a/spec/requests/api/badges_spec.rb b/spec/requests/api/badges_spec.rb
index 1dd0cb4817c..771a78a2d91 100644
--- a/spec/requests/api/badges_spec.rb
+++ b/spec/requests/api/badges_spec.rb
@@ -345,7 +345,7 @@ describe API::Badges do
   end
 
   def setup_project
-    create(:project, :public, :access_requestable, creator_id: maintainer.id, namespace: project_group) do |project|
+    create(:project, :public, creator_id: maintainer.id, namespace: project_group) do |project|
       project.add_developer(developer)
       project.add_maintainer(maintainer)
       project.request_access(access_requester)
@@ -356,7 +356,7 @@ describe API::Badges do
   end
 
   def setup_group
-    create(:group, :public, :access_requestable) do |group|
+    create(:group, :public) do |group|
       group.add_developer(developer)
       group.add_owner(maintainer)
       group.request_access(access_requester)
diff --git a/spec/requests/api/members_spec.rb b/spec/requests/api/members_spec.rb
index 26f6e705528..7e67ee28bef 100644
--- a/spec/requests/api/members_spec.rb
+++ b/spec/requests/api/members_spec.rb
@@ -7,7 +7,7 @@ describe API::Members do
   let(:stranger) { create(:user) }
 
   let(:project) do
-    create(:project, :public, :access_requestable, creator_id: maintainer.id, namespace: maintainer.namespace) do |project|
+    create(:project, :public, creator_id: maintainer.id, namespace: maintainer.namespace) do |project|
       project.add_developer(developer)
       project.add_maintainer(maintainer)
       project.request_access(access_requester)
@@ -15,7 +15,7 @@ describe API::Members do
   end
 
   let!(:group) do
-    create(:group, :public, :access_requestable) do |group|
+    create(:group, :public) do |group|
       group.add_developer(developer)
       group.add_owner(maintainer)
       group.request_access(access_requester)
diff --git a/spec/services/members/approve_access_request_service_spec.rb b/spec/services/members/approve_access_request_service_spec.rb
index f56c31e51f6..5bbceac3dd0 100644
--- a/spec/services/members/approve_access_request_service_spec.rb
+++ b/spec/services/members/approve_access_request_service_spec.rb
@@ -3,8 +3,8 @@
 require 'spec_helper'
 
 describe Members::ApproveAccessRequestService do
-  let(:project) { create(:project, :public, :access_requestable) }
-  let(:group) { create(:group, :public, :access_requestable) }
+  let(:project) { create(:project, :public) }
+  let(:group) { create(:group, :public) }
   let(:current_user) { create(:user) }
   let(:access_requester_user) { create(:user) }
   let(:access_requester) { source.requesters.find_by!(user_id: access_requester_user.id) }
diff --git a/spec/services/members/request_access_service_spec.rb b/spec/services/members/request_access_service_spec.rb
index 2e5275eb3f2..a0f7ae91bdb 100644
--- a/spec/services/members/request_access_service_spec.rb
+++ b/spec/services/members/request_access_service_spec.rb
@@ -41,7 +41,7 @@ describe Members::RequestAccessService do
   context 'when access requests are disabled' do
     %i[project group].each do |source_type|
       it_behaves_like 'a service raising Gitlab::Access::AccessDeniedError' do
-        let(:source) { create(source_type, :public) }
+        let(:source) { create(source_type, :public, :request_access_disabled) }
       end
     end
   end
@@ -49,7 +49,7 @@ describe Members::RequestAccessService do
   context 'when current user can request access to the project' do
     %i[project group].each do |source_type|
       it_behaves_like 'a service creating a access request' do
-        let(:source) { create(source_type, :public, :access_requestable) }
+        let(:source) { create(source_type, :public) }
       end
     end
   end
diff --git a/spec/services/notification_service_spec.rb b/spec/services/notification_service_spec.rb
index bd6734634cb..70ce05927b4 100644
--- a/spec/services/notification_service_spec.rb
+++ b/spec/services/notification_service_spec.rb
@@ -1942,7 +1942,7 @@ describe NotificationService, :mailer do
         let(:developer) { create(:user) }
 
         let!(:group) do
-          create(:group, :public, :access_requestable) do |group|
+          create(:group, :public) do |group|
             group.add_owner(owner)
             group.add_maintainer(maintainer)
             group.add_developer(developer)
@@ -1968,7 +1968,7 @@ describe NotificationService, :mailer do
       end
 
       it_behaves_like 'sends notification only to a maximum of ten, most recently active group owners' do
-        let(:group) { create(:group, :public, :access_requestable) }
+        let(:group) { create(:group, :public) }
         let(:notification_trigger) { group.request_access(added_user) }
       end
     end
@@ -2029,7 +2029,7 @@ describe NotificationService, :mailer do
           let(:maintainer) { create(:user) }
 
           let!(:project) do
-            create(:project, :public, :access_requestable) do |project|
+            create(:project, :public) do |project|
               project.add_developer(developer)
               project.add_maintainer(maintainer)
             end
@@ -2053,7 +2053,7 @@ describe NotificationService, :mailer do
         end
 
         it_behaves_like 'sends notification only to a maximum of ten, most recently active project maintainers' do
-          let(:project) { create(:project, :public, :access_requestable) }
+          let(:project) { create(:project, :public) }
           let(:notification_trigger) { project.request_access(added_user) }
         end
       end
@@ -2064,7 +2064,7 @@ describe NotificationService, :mailer do
 
         context 'when the project has no maintainers' do
           context 'when the group has at least one owner' do
-            let!(:project) { create(:project, :public, :access_requestable, namespace: group) }
+            let!(:project) { create(:project, :public, namespace: group) }
 
             before do
               reset_delivered_emails!
@@ -2079,14 +2079,14 @@ describe NotificationService, :mailer do
             end
 
             it_behaves_like 'sends notification only to a maximum of ten, most recently active group owners' do
-              let(:group) { create(:group, :public, :access_requestable) }
+              let(:group) { create(:group, :public) }
               let(:notification_trigger) { project.request_access(added_user) }
             end
           end
 
           context 'when the group does not have any owners' do
             let(:group) { create(:group) }
-            let!(:project) { create(:project, :public, :access_requestable, namespace: group) }
+            let!(:project) { create(:project, :public, namespace: group) }
 
             context 'recipients' do
               before do
@@ -2107,7 +2107,7 @@ describe NotificationService, :mailer do
           let(:developer) { create(:user) }
 
           let!(:project) do
-            create(:project, :public, :access_requestable, namespace: group) do |project|
+            create(:project, :public, namespace: group) do |project|
               project.add_maintainer(maintainer)
               project.add_developer(developer)
             end
@@ -2128,7 +2128,7 @@ describe NotificationService, :mailer do
           end
 
           it_behaves_like 'sends notification only to a maximum of ten, most recently active project maintainers' do
-            let(:project) { create(:project, :public, :access_requestable, namespace: group) }
+            let(:project) { create(:project, :public, namespace: group) }
             let(:notification_trigger) { project.request_access(added_user) }
           end
         end
diff --git a/spec/services/projects/container_repository/cleanup_tags_service_spec.rb b/spec/services/projects/container_repository/cleanup_tags_service_spec.rb
index 14247f1c71e..14772d172e8 100644
--- a/spec/services/projects/container_repository/cleanup_tags_service_spec.rb
+++ b/spec/services/projects/container_repository/cleanup_tags_service_spec.rb
@@ -157,6 +157,6 @@ describe Projects::ContainerRepository::CleanupTagsService do
   def expect_delete(digest)
     expect_any_instance_of(ContainerRegistry::Client)
       .to receive(:delete_repository_tag)
-      .with(repository.path, digest)
+      .with(repository.path, digest) { true }
   end
 end
diff --git a/spec/services/projects/container_repository/delete_tags_service_spec.rb b/spec/services/projects/container_repository/delete_tags_service_spec.rb
index 2ec5850c69e..f296ef3a776 100644
--- a/spec/services/projects/container_repository/delete_tags_service_spec.rb
+++ b/spec/services/projects/container_repository/delete_tags_service_spec.rb
@@ -87,6 +87,21 @@ describe Projects::ContainerRepository::DeleteTagsService do
 
           is_expected.to include(status: :success)
         end
+
+        it 'succedes when tag delete returns 404' do
+          stub_upload("{\n  \"config\": {\n  }\n}", 'sha256:4435000728ee66e6a80e55637fc22725c256b61de344a2ecdeaac6bdb36e8bc3')
+
+          stub_request(:put, "http://registry.gitlab/v2/#{repository.path}/manifests/A")
+            .to_return(status: 200, body: "", headers: { 'docker-content-digest' => 'sha256:dummy' })
+
+          stub_request(:put, "http://registry.gitlab/v2/#{repository.path}/manifests/Ba")
+            .to_return(status: 200, body: "", headers: { 'docker-content-digest' => 'sha256:dummy' })
+
+          stub_request(:delete, "http://registry.gitlab/v2/#{repository.path}/manifests/sha256:dummy")
+            .to_return(status: 404, body: "", headers: {})
+
+          is_expected.to include(status: :success)
+        end
       end
     end
   end