diff --git a/app/assets/javascripts/diffs/store/actions.js b/app/assets/javascripts/diffs/store/actions.js
index b920e041135..bd85105ccb4 100644
--- a/app/assets/javascripts/diffs/store/actions.js
+++ b/app/assets/javascripts/diffs/store/actions.js
@@ -111,15 +111,22 @@ export const fetchDiffFilesBatch = ({ commit, state }) => {
   commit(types.SET_BATCH_LOADING, true);
   commit(types.SET_RETRIEVING_BATCHES, true);
 
-  const getBatch = page =>
+  const getBatch = (page = 1) =>
     axios
       .get(state.endpointBatch, {
-        params: { ...urlParams, page },
+        params: {
+          ...urlParams,
+          page,
+        },
       })
       .then(({ data: { pagination, diff_files } }) => {
         commit(types.SET_DIFF_DATA_BATCH, { diff_files });
         commit(types.SET_BATCH_LOADING, false);
-        if (!pagination.next_page) commit(types.SET_RETRIEVING_BATCHES, false);
+
+        if (!pagination.next_page) {
+          commit(types.SET_RETRIEVING_BATCHES, false);
+        }
+
         return pagination.next_page;
       })
       .then(nextPage => nextPage && getBatch(nextPage))
@@ -132,6 +139,11 @@ export const fetchDiffFilesBatch = ({ commit, state }) => {
 
 export const fetchDiffFilesMeta = ({ commit, state }) => {
   const worker = new TreeWorker();
+  const urlParams = {};
+
+  if (state.useSingleDiffStyle) {
+    urlParams.view = state.diffViewType;
+  }
 
   commit(types.SET_LOADING, true);
 
@@ -142,16 +154,17 @@ export const fetchDiffFilesMeta = ({ commit, state }) => {
   });
 
   return axios
-    .get(state.endpointMetadata)
+    .get(mergeUrlParams(urlParams, state.endpointMetadata))
     .then(({ data }) => {
       const strippedData = { ...data };
+
       delete strippedData.diff_files;
       commit(types.SET_LOADING, false);
       commit(types.SET_MERGE_REQUEST_DIFFS, data.merge_request_diffs || []);
       commit(types.SET_DIFF_DATA, strippedData);
 
-      prepareDiffData(data);
-      worker.postMessage(data.diff_files);
+      worker.postMessage(prepareDiffData(data, state.diffFiles));
+
       return data;
     })
     .catch(() => worker.terminate());
@@ -226,7 +239,7 @@ export const startRenderDiffsQueue = ({ state, commit }) => {
       const nextFile = state.diffFiles.find(
         file =>
           !file.renderIt &&
-          (file.viewer && (!file.viewer.collapsed || !file.viewer.name === diffViewerModes.text)),
+          (file.viewer && (!file.viewer.collapsed || file.viewer.name !== diffViewerModes.text)),
       );
 
       if (nextFile) {
diff --git a/app/assets/javascripts/diffs/store/mutations.js b/app/assets/javascripts/diffs/store/mutations.js
index 1505be1a0b2..c26411af5d7 100644
--- a/app/assets/javascripts/diffs/store/mutations.js
+++ b/app/assets/javascripts/diffs/store/mutations.js
@@ -148,8 +148,8 @@ export default {
   },
 
   [types.ADD_COLLAPSED_DIFFS](state, { file, data }) {
-    prepareDiffData(data);
-    const [newFileData] = data.diff_files.filter(f => f.file_hash === file.file_hash);
+    const files = prepareDiffData(data);
+    const [newFileData] = files.filter(f => f.file_hash === file.file_hash);
     const selectedFile = state.diffFiles.find(f => f.file_hash === file.file_hash);
     Object.assign(selectedFile, { ...newFileData });
   },
diff --git a/app/assets/javascripts/diffs/store/utils.js b/app/assets/javascripts/diffs/store/utils.js
index b379f1fabef..80972d2aeb8 100644
--- a/app/assets/javascripts/diffs/store/utils.js
+++ b/app/assets/javascripts/diffs/store/utils.js
@@ -217,30 +217,19 @@ function diffFileUniqueId(file) {
   return `${file.content_sha}-${file.file_hash}`;
 }
 
-function combineDiffFilesWithPriorFiles(files, prior = []) {
-  files.forEach(file => {
-    const id = diffFileUniqueId(file);
-    const oldMatch = prior.find(oldFile => diffFileUniqueId(oldFile) === id);
+function mergeTwoFiles(target, source) {
+  const originalInline = target.highlighted_diff_lines;
+  const originalParallel = target.parallel_diff_lines;
+  const missingInline = !originalInline.length;
+  const missingParallel = !originalParallel.length;
 
-    if (oldMatch) {
-      const missingInline = !file.highlighted_diff_lines;
-      const missingParallel = !file.parallel_diff_lines;
-
-      if (missingInline) {
-        Object.assign(file, {
-          highlighted_diff_lines: oldMatch.highlighted_diff_lines,
-        });
-      }
-
-      if (missingParallel) {
-        Object.assign(file, {
-          parallel_diff_lines: oldMatch.parallel_diff_lines,
-        });
-      }
-    }
-  });
-
-  return files;
+  return {
+    ...target,
+    highlighted_diff_lines: missingInline ? source.highlighted_diff_lines : originalInline,
+    parallel_diff_lines: missingParallel ? source.parallel_diff_lines : originalParallel,
+    renderIt: source.renderIt,
+    collapsed: source.collapsed,
+  };
 }
 
 function ensureBasicDiffFileLines(file) {
@@ -260,13 +249,16 @@ function cleanRichText(text) {
 }
 
 function prepareLine(line) {
-  return Object.assign(line, {
-    rich_text: cleanRichText(line.rich_text),
-    discussionsExpanded: true,
-    discussions: [],
-    hasForm: false,
-    text: undefined,
-  });
+  if (!line.alreadyPrepared) {
+    Object.assign(line, {
+      rich_text: cleanRichText(line.rich_text),
+      discussionsExpanded: true,
+      discussions: [],
+      hasForm: false,
+      text: undefined,
+      alreadyPrepared: true,
+    });
+  }
 }
 
 function prepareDiffFileLines(file) {
@@ -288,11 +280,11 @@ function prepareDiffFileLines(file) {
       parallelLinesCount += 1;
       prepareLine(line.right);
     }
+  });
 
-    Object.assign(file, {
-      inlineLinesCount: inlineLines.length,
-      parallelLinesCount,
-    });
+  Object.assign(file, {
+    inlineLinesCount: inlineLines.length,
+    parallelLinesCount,
   });
 
   return file;
@@ -318,11 +310,26 @@ function finalizeDiffFile(file) {
   return file;
 }
 
-export function prepareDiffData(diffData, priorFiles) {
-  return combineDiffFilesWithPriorFiles(diffData.diff_files, priorFiles)
+function deduplicateFilesList(files) {
+  const dedupedFiles = files.reduce((newList, file) => {
+    const id = diffFileUniqueId(file);
+
+    return {
+      ...newList,
+      [id]: newList[id] ? mergeTwoFiles(newList[id], file) : file,
+    };
+  }, {});
+
+  return Object.values(dedupedFiles);
+}
+
+export function prepareDiffData(diff, priorFiles = []) {
+  const cleanedFiles = (diff.diff_files || [])
     .map(ensureBasicDiffFileLines)
     .map(prepareDiffFileLines)
     .map(finalizeDiffFile);
+
+  return deduplicateFilesList([...priorFiles, ...cleanedFiles]);
 }
 
 export function getDiffPositionByLineCode(diffFiles, useSingleDiffStyle) {
diff --git a/app/assets/javascripts/monitoring/components/charts/single_stat.vue b/app/assets/javascripts/monitoring/components/charts/single_stat.vue
index e75ddb05808..3368be4df75 100644
--- a/app/assets/javascripts/monitoring/components/charts/single_stat.vue
+++ b/app/assets/javascripts/monitoring/components/charts/single_stat.vue
@@ -19,8 +19,21 @@ export default {
     queryInfo() {
       return this.graphData.metrics[0];
     },
-    engineeringNotation() {
-      return `${roundOffFloat(this.queryInfo.result[0].value[1], 1)}${this.queryInfo.unit}`;
+    queryResult() {
+      return this.queryInfo.result[0]?.value[1];
+    },
+    /**
+     * This method formats the query result from a promQL expression
+     * allowing a user to format the data in percentile values
+     * by using the `max_value` inner property from the graphData prop
+     * @returns {(String)}
+     */
+    statValue() {
+      const chartValue = this.graphData?.max_value
+        ? (this.queryResult / Number(this.graphData.max_value)) * 100
+        : this.queryResult;
+
+      return `${roundOffFloat(chartValue, 1)}${this.queryInfo.unit}`;
     },
     graphTitle() {
       return this.queryInfo.label;
@@ -33,6 +46,6 @@ export default {
     <div class="prometheus-graph-header">
       <h5 ref="graphTitle" class="prometheus-graph-title">{{ graphTitle }}</h5>
     </div>
-    <gl-single-stat :value="engineeringNotation" :title="graphTitle" variant="success" />
+    <gl-single-stat :value="statValue" :title="graphTitle" variant="success" />
   </div>
 </template>
diff --git a/app/controllers/projects/settings/operations_controller.rb b/app/controllers/projects/settings/operations_controller.rb
index 1571cb8cd34..3817da8596b 100644
--- a/app/controllers/projects/settings/operations_controller.rb
+++ b/app/controllers/projects/settings/operations_controller.rb
@@ -60,7 +60,7 @@ module Projects
 
       # overridden in EE
       def permitted_project_params
-        {
+        project_params = {
           metrics_setting_attributes: [:external_dashboard_url],
 
           error_tracking_setting_attributes: [
@@ -72,6 +72,12 @@ module Projects
 
           grafana_integration_attributes: [:token, :grafana_url, :enabled]
         }
+
+        if Feature.enabled?(:settings_operations_prometheus_service, project)
+          project_params[:prometheus_integration_attributes] = [:manual_configuration, :api_url]
+        end
+
+        project_params
       end
     end
   end
diff --git a/app/models/project.rb b/app/models/project.rb
index b2ac9c99ab6..0ed2510dbf4 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -322,6 +322,7 @@ class Project < ApplicationRecord
   accepts_nested_attributes_for :error_tracking_setting, update_only: true
   accepts_nested_attributes_for :metrics_setting, update_only: true, allow_destroy: true
   accepts_nested_attributes_for :grafana_integration, update_only: true, allow_destroy: true
+  accepts_nested_attributes_for :prometheus_service, update_only: true
 
   delegate :feature_available?, :builds_enabled?, :wiki_enabled?,
     :merge_requests_enabled?, :forking_enabled?, :issues_enabled?,
diff --git a/app/services/projects/operations/update_service.rb b/app/services/projects/operations/update_service.rb
index 3ee6c2467c2..f0144ad1213 100644
--- a/app/services/projects/operations/update_service.rb
+++ b/app/services/projects/operations/update_service.rb
@@ -15,6 +15,7 @@ module Projects
         error_tracking_params
           .merge(metrics_setting_params)
           .merge(grafana_integration_params)
+          .merge(prometheus_integration_params)
       end
 
       def metrics_setting_params
@@ -77,6 +78,15 @@ module Projects
 
         { grafana_integration_attributes: attrs.merge(_destroy: destroy) }
       end
+
+      def prometheus_integration_params
+        return {} unless attrs = params[:prometheus_integration_attributes]
+
+        service = project.find_or_initialize_service(::PrometheusService.to_param)
+        service.assign_attributes(attrs)
+
+        { prometheus_service_attributes: service.attributes.except(*%w(id project_id created_at updated_at)) }
+      end
     end
   end
 end
diff --git a/changelogs/unreleased/118783-restoring-wikis-fails.yml b/changelogs/unreleased/118783-restoring-wikis-fails.yml
new file mode 100644
index 00000000000..f8a5b13ba3a
--- /dev/null
+++ b/changelogs/unreleased/118783-restoring-wikis-fails.yml
@@ -0,0 +1,5 @@
+---
+title: Fix backup restoration with pre-existing wiki
+merge_request: 24394
+author:
+type: fixed
diff --git a/changelogs/unreleased/jivanvl-add-percentile-support-single-stat-charts.yml b/changelogs/unreleased/jivanvl-add-percentile-support-single-stat-charts.yml
new file mode 100644
index 00000000000..ddf0ee90a37
--- /dev/null
+++ b/changelogs/unreleased/jivanvl-add-percentile-support-single-stat-charts.yml
@@ -0,0 +1,5 @@
+---
+title: Add percentile value support to single stat panel types
+merge_request: 24813
+author:
+type: changed
diff --git a/changelogs/unreleased/refactoring-entities-file-17.yml b/changelogs/unreleased/refactoring-entities-file-17.yml
new file mode 100644
index 00000000000..fa801c259f0
--- /dev/null
+++ b/changelogs/unreleased/refactoring-entities-file-17.yml
@@ -0,0 +1,5 @@
+---
+title: Separate label entities into own class files
+merge_request: 24938
+author: Rajendra Kadam
+type: added
diff --git a/changelogs/unreleased/refactoring-entities-file-19.yml b/changelogs/unreleased/refactoring-entities-file-19.yml
new file mode 100644
index 00000000000..f5aeac766c3
--- /dev/null
+++ b/changelogs/unreleased/refactoring-entities-file-19.yml
@@ -0,0 +1,5 @@
+---
+title: Separate entities into own class files
+merge_request: 24941
+author: Rajendra Kadam
+type: added
diff --git a/changelogs/unreleased/refactoring-entities-file-21.yml b/changelogs/unreleased/refactoring-entities-file-21.yml
new file mode 100644
index 00000000000..73c4cc4daac
--- /dev/null
+++ b/changelogs/unreleased/refactoring-entities-file-21.yml
@@ -0,0 +1,5 @@
+---
+title: Separate job entities into own class files
+merge_request: 24948
+author: Rajendra Kadam
+type: added
diff --git a/changelogs/unreleased/refactoring-entities-file-24.yml b/changelogs/unreleased/refactoring-entities-file-24.yml
new file mode 100644
index 00000000000..f58285aeeb6
--- /dev/null
+++ b/changelogs/unreleased/refactoring-entities-file-24.yml
@@ -0,0 +1,5 @@
+---
+title: Separate token and template entities into own class files
+merge_request: 24955
+author: Rajendra Kadam
+type: added
diff --git a/changelogs/unreleased/update-handlebarsjs.yml b/changelogs/unreleased/update-handlebarsjs.yml
new file mode 100644
index 00000000000..131ef58724b
--- /dev/null
+++ b/changelogs/unreleased/update-handlebarsjs.yml
@@ -0,0 +1,5 @@
+---
+title: Update handlebars to remove issues from dependency dashboard
+merge_request:
+author:
+type: security
diff --git a/doc/development/testing_guide/review_apps.md b/doc/development/testing_guide/review_apps.md
index a38e100303e..5f0f39cd15b 100644
--- a/doc/development/testing_guide/review_apps.md
+++ b/doc/development/testing_guide/review_apps.md
@@ -143,6 +143,11 @@ their node under pressure.
 
 ## How to
 
+### Get access to the GCP Review Apps cluster
+
+You need to [open an access request (internal link)](https://gitlab.com/gitlab-com/access-requests/issues/new)
+for the `gcp-review-apps-sg` GCP group.
+
 ### Log into my Review App
 
 The default username is `root` and its password can be found in the 1Password
@@ -163,6 +168,7 @@ secure note named `gitlab-{ce,ee} Review App's root password`.
 
 ### Run a Rails console
 
+1. Make sure you [have access to the cluster](#get-access-to-the-gcp-review-apps-cluster) first.
 1. [Filter Workloads by your Review App slug](https://console.cloud.google.com/kubernetes/workload?project=gitlab-review-apps),
    e.g. `review-qa-raise-e-12chm0`.
 1. Find and open the `task-runner` Deployment, e.g. `review-qa-raise-e-12chm0-task-runner`.
@@ -178,6 +184,7 @@ secure note named `gitlab-{ce,ee} Review App's root password`.
 
 ### Dig into a Pod's logs
 
+1. Make sure you [have access to the cluster](#get-access-to-the-gcp-review-apps-cluster) first.
 1. [Filter Workloads by your Review App slug](https://console.cloud.google.com/kubernetes/workload?project=gitlab-review-apps),
    e.g. `review-qa-raise-e-12chm0`.
 1. Find and open the `migrations` Deployment, e.g.
diff --git a/lib/api/entities.rb b/lib/api/entities.rb
index aa2cbd3fed3..5d5a61b76f1 100644
--- a/lib/api/entities.rb
+++ b/lib/api/entities.rb
@@ -163,42 +163,6 @@ module API
       end
     end
 
-    class LabelBasic < Grape::Entity
-      expose :id, :name, :color, :description, :description_html, :text_color
-    end
-
-    class Label < LabelBasic
-      with_options if: lambda { |_, options| options[:with_counts] } do
-        expose :open_issues_count do |label, options|
-          label.open_issues_count(options[:current_user])
-        end
-
-        expose :closed_issues_count do |label, options|
-          label.closed_issues_count(options[:current_user])
-        end
-
-        expose :open_merge_requests_count do |label, options|
-          label.open_merge_requests_count(options[:current_user])
-        end
-      end
-
-      expose :subscribed do |label, options|
-        label.subscribed?(options[:current_user], options[:parent])
-      end
-    end
-
-    class GroupLabel < Label
-    end
-
-    class ProjectLabel < Label
-      expose :priority do |label, options|
-        label.priority(options[:parent])
-      end
-      expose :is_project_label do |label, options|
-        label.is_a?(::ProjectLabel)
-      end
-    end
-
     class List < Grape::Entity
       expose :id
       expose :label, using: Entities::LabelBasic
@@ -242,130 +206,6 @@ module API
       expose :message, :starts_at, :ends_at, :color, :font, :target_path, :broadcast_type
     end
 
-    class ApplicationStatistics < Grape::Entity
-      include ActionView::Helpers::NumberHelper
-      include CountHelper
-
-      expose :forks do |counts|
-        approximate_fork_count_with_delimiters(counts)
-      end
-
-      expose :issues do |counts|
-        approximate_count_with_delimiters(counts, ::Issue)
-      end
-
-      expose :merge_requests do |counts|
-        approximate_count_with_delimiters(counts, ::MergeRequest)
-      end
-
-      expose :notes do |counts|
-        approximate_count_with_delimiters(counts, ::Note)
-      end
-
-      expose :snippets do |counts|
-        approximate_count_with_delimiters(counts, ::Snippet)
-      end
-
-      expose :ssh_keys do |counts|
-        approximate_count_with_delimiters(counts, ::Key)
-      end
-
-      expose :milestones do |counts|
-        approximate_count_with_delimiters(counts, ::Milestone)
-      end
-
-      expose :users do |counts|
-        approximate_count_with_delimiters(counts, ::User)
-      end
-
-      expose :projects do |counts|
-        approximate_count_with_delimiters(counts, ::Project)
-      end
-
-      expose :groups do |counts|
-        approximate_count_with_delimiters(counts, ::Group)
-      end
-
-      expose :active_users do |_|
-        number_with_delimiter(::User.active.count)
-      end
-    end
-
-    class ApplicationSetting < Grape::Entity
-      def self.exposed_attributes
-        attributes = ::ApplicationSettingsHelper.visible_attributes
-        attributes.delete(:performance_bar_allowed_group_path)
-        attributes.delete(:performance_bar_enabled)
-        attributes.delete(:allow_local_requests_from_hooks_and_services)
-
-        # let's not expose the secret key in a response
-        attributes.delete(:asset_proxy_secret_key)
-        attributes.delete(:eks_secret_access_key)
-
-        attributes
-      end
-
-      expose :id, :performance_bar_allowed_group_id
-      expose(*exposed_attributes)
-      expose(:restricted_visibility_levels) do |setting, _options|
-        setting.restricted_visibility_levels.map { |level| Gitlab::VisibilityLevel.string_level(level) }
-      end
-      expose(:default_project_visibility) { |setting, _options| Gitlab::VisibilityLevel.string_level(setting.default_project_visibility) }
-      expose(:default_snippet_visibility) { |setting, _options| Gitlab::VisibilityLevel.string_level(setting.default_snippet_visibility) }
-      expose(:default_group_visibility) { |setting, _options| Gitlab::VisibilityLevel.string_level(setting.default_group_visibility) }
-
-      expose(*::ApplicationSettingsHelper.external_authorization_service_attributes)
-
-      # support legacy names, can be removed in v5
-      expose :password_authentication_enabled_for_web, as: :password_authentication_enabled
-      expose :password_authentication_enabled_for_web, as: :signin_enabled
-      expose :allow_local_requests_from_web_hooks_and_services, as: :allow_local_requests_from_hooks_and_services
-    end
-
-    class Appearance < Grape::Entity
-      expose :title
-      expose :description
-
-      expose :logo do |appearance, options|
-        appearance.logo.url
-      end
-
-      expose :header_logo do |appearance, options|
-        appearance.header_logo.url
-      end
-
-      expose :favicon do |appearance, options|
-        appearance.favicon.url
-      end
-
-      expose :new_project_guidelines
-      expose :header_message
-      expose :footer_message
-      expose :message_background_color
-      expose :message_font_color
-      expose :email_header_and_footer_enabled
-    end
-
-    # deprecated old Release representation
-    class TagRelease < Grape::Entity
-      expose :tag, as: :tag_name
-      expose :description
-    end
-
-    module Releases
-      class Link < Grape::Entity
-        expose :id
-        expose :name
-        expose :url
-        expose :external?, as: :external
-      end
-
-      class Source < Grape::Entity
-        expose :format
-        expose :url
-      end
-    end
-
     class Release < Grape::Entity
       include ::API::Helpers::Presentable
 
@@ -477,40 +317,6 @@ module API
       expose :id, :token
     end
 
-    class JobArtifactFile < Grape::Entity
-      expose :filename
-      expose :cached_size, as: :size
-    end
-
-    class JobArtifact < Grape::Entity
-      expose :file_type, :size, :filename, :file_format
-    end
-
-    class JobBasic < Grape::Entity
-      expose :id, :status, :stage, :name, :ref, :tag, :coverage, :allow_failure
-      expose :created_at, :started_at, :finished_at
-      expose :duration
-      expose :user, with: Entities::User
-      expose :commit, with: Entities::Commit
-      expose :pipeline, with: Entities::PipelineBasic
-
-      expose :web_url do |job, _options|
-        Gitlab::Routing.url_helpers.project_job_url(job.project, job)
-      end
-    end
-
-    class Job < JobBasic
-      # artifacts_file is included in job_artifacts, but kept for backward compatibility (remove in api/v5)
-      expose :artifacts_file, using: JobArtifactFile, if: -> (job, opts) { job.artifacts? }
-      expose :job_artifacts, as: :artifacts, using: JobArtifact
-      expose :runner, with: Runner
-      expose :artifacts_expire_at
-    end
-
-    class JobBasicWithProject < JobBasic
-      expose :project, with: Entities::ProjectIdentity
-    end
-
     class Trigger < Grape::Entity
       include ::API::Helpers::Presentable
 
@@ -585,32 +391,6 @@ module API
       expose :content
     end
 
-    class TemplatesList < Grape::Entity
-      expose :key
-      expose :name
-    end
-
-    class Template < Grape::Entity
-      expose :name, :content
-    end
-
-    class BroadcastMessage < Grape::Entity
-      expose :id, :message, :starts_at, :ends_at, :color, :font
-      expose :active?, as: :active
-    end
-
-    class PersonalAccessToken < Grape::Entity
-      expose :id, :name, :revoked, :created_at, :scopes
-      expose :active?, as: :active
-      expose :expires_at do |personal_access_token|
-        personal_access_token.expires_at ? personal_access_token.expires_at.strftime("%Y-%m-%d") : nil
-      end
-    end
-
-    class PersonalAccessTokenWithToken < PersonalAccessToken
-      expose :token
-    end
-
     class ImpersonationToken < PersonalAccessToken
       expose :impersonation
     end
diff --git a/lib/api/entities/appearance.rb b/lib/api/entities/appearance.rb
new file mode 100644
index 00000000000..c3cffc8d05c
--- /dev/null
+++ b/lib/api/entities/appearance.rb
@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+module API
+  module Entities
+    class Appearance < Grape::Entity
+      expose :title
+      expose :description
+
+      expose :logo do |appearance, options|
+        appearance.logo.url
+      end
+
+      expose :header_logo do |appearance, options|
+        appearance.header_logo.url
+      end
+
+      expose :favicon do |appearance, options|
+        appearance.favicon.url
+      end
+
+      expose :new_project_guidelines
+      expose :header_message
+      expose :footer_message
+      expose :message_background_color
+      expose :message_font_color
+      expose :email_header_and_footer_enabled
+    end
+  end
+end
diff --git a/lib/api/entities/application_setting.rb b/lib/api/entities/application_setting.rb
new file mode 100644
index 00000000000..6ca2d1e6da4
--- /dev/null
+++ b/lib/api/entities/application_setting.rb
@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+module API
+  module Entities
+    class ApplicationSetting < Grape::Entity
+      def self.exposed_attributes
+        attributes = ::ApplicationSettingsHelper.visible_attributes
+        attributes.delete(:performance_bar_allowed_group_path)
+        attributes.delete(:performance_bar_enabled)
+        attributes.delete(:allow_local_requests_from_hooks_and_services)
+
+        # let's not expose the secret key in a response
+        attributes.delete(:asset_proxy_secret_key)
+        attributes.delete(:eks_secret_access_key)
+
+        attributes
+      end
+
+      expose :id, :performance_bar_allowed_group_id
+      expose(*exposed_attributes)
+      expose(:restricted_visibility_levels) do |setting, _options|
+        setting.restricted_visibility_levels.map { |level| Gitlab::VisibilityLevel.string_level(level) }
+      end
+      expose(:default_project_visibility) { |setting, _options| Gitlab::VisibilityLevel.string_level(setting.default_project_visibility) }
+      expose(:default_snippet_visibility) { |setting, _options| Gitlab::VisibilityLevel.string_level(setting.default_snippet_visibility) }
+      expose(:default_group_visibility) { |setting, _options| Gitlab::VisibilityLevel.string_level(setting.default_group_visibility) }
+
+      expose(*::ApplicationSettingsHelper.external_authorization_service_attributes)
+
+      # support legacy names, can be removed in v5
+      expose :password_authentication_enabled_for_web, as: :password_authentication_enabled
+      expose :password_authentication_enabled_for_web, as: :signin_enabled
+      expose :allow_local_requests_from_web_hooks_and_services, as: :allow_local_requests_from_hooks_and_services
+    end
+  end
+end
diff --git a/lib/api/entities/application_statistics.rb b/lib/api/entities/application_statistics.rb
new file mode 100644
index 00000000000..4bcba1da464
--- /dev/null
+++ b/lib/api/entities/application_statistics.rb
@@ -0,0 +1,54 @@
+# frozen_string_literal: true
+
+module API
+  module Entities
+    class ApplicationStatistics < Grape::Entity
+      include ActionView::Helpers::NumberHelper
+      include CountHelper
+
+      expose :forks do |counts|
+        approximate_fork_count_with_delimiters(counts)
+      end
+
+      expose :issues do |counts|
+        approximate_count_with_delimiters(counts, ::Issue)
+      end
+
+      expose :merge_requests do |counts|
+        approximate_count_with_delimiters(counts, ::MergeRequest)
+      end
+
+      expose :notes do |counts|
+        approximate_count_with_delimiters(counts, ::Note)
+      end
+
+      expose :snippets do |counts|
+        approximate_count_with_delimiters(counts, ::Snippet)
+      end
+
+      expose :ssh_keys do |counts|
+        approximate_count_with_delimiters(counts, ::Key)
+      end
+
+      expose :milestones do |counts|
+        approximate_count_with_delimiters(counts, ::Milestone)
+      end
+
+      expose :users do |counts|
+        approximate_count_with_delimiters(counts, ::User)
+      end
+
+      expose :projects do |counts|
+        approximate_count_with_delimiters(counts, ::Project)
+      end
+
+      expose :groups do |counts|
+        approximate_count_with_delimiters(counts, ::Group)
+      end
+
+      expose :active_users do |_|
+        number_with_delimiter(::User.active.count)
+      end
+    end
+  end
+end
diff --git a/lib/api/entities/broadcast_message.rb b/lib/api/entities/broadcast_message.rb
new file mode 100644
index 00000000000..31d4cc50526
--- /dev/null
+++ b/lib/api/entities/broadcast_message.rb
@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+module API
+  module Entities
+    class BroadcastMessage < Grape::Entity
+      expose :id, :message, :starts_at, :ends_at, :color, :font
+      expose :active?, as: :active
+    end
+  end
+end
diff --git a/lib/api/entities/group_label.rb b/lib/api/entities/group_label.rb
new file mode 100644
index 00000000000..4e1b9226e6d
--- /dev/null
+++ b/lib/api/entities/group_label.rb
@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+module API
+  module Entities
+    class GroupLabel < Entities::Label
+    end
+  end
+end
diff --git a/lib/api/entities/job.rb b/lib/api/entities/job.rb
new file mode 100644
index 00000000000..cbee8794007
--- /dev/null
+++ b/lib/api/entities/job.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+module API
+  module Entities
+    class Job < Entities::JobBasic
+      # artifacts_file is included in job_artifacts, but kept for backward compatibility (remove in api/v5)
+      expose :artifacts_file, using: Entities::JobArtifactFile, if: -> (job, opts) { job.artifacts? }
+      expose :job_artifacts, as: :artifacts, using: Entities::JobArtifact
+      expose :runner, with: Entities::Runner
+      expose :artifacts_expire_at
+    end
+  end
+end
diff --git a/lib/api/entities/job_artifact.rb b/lib/api/entities/job_artifact.rb
new file mode 100644
index 00000000000..94dbdb38fee
--- /dev/null
+++ b/lib/api/entities/job_artifact.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+module API
+  module Entities
+    class JobArtifact < Grape::Entity
+      expose :file_type, :size, :filename, :file_format
+    end
+  end
+end
diff --git a/lib/api/entities/job_artifact_file.rb b/lib/api/entities/job_artifact_file.rb
new file mode 100644
index 00000000000..fa2851a7f0e
--- /dev/null
+++ b/lib/api/entities/job_artifact_file.rb
@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+module API
+  module Entities
+    class JobArtifactFile < Grape::Entity
+      expose :filename
+      expose :cached_size, as: :size
+    end
+  end
+end
diff --git a/lib/api/entities/job_basic.rb b/lib/api/entities/job_basic.rb
new file mode 100644
index 00000000000..a8541039934
--- /dev/null
+++ b/lib/api/entities/job_basic.rb
@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+module API
+  module Entities
+    class JobBasic < Grape::Entity
+      expose :id, :status, :stage, :name, :ref, :tag, :coverage, :allow_failure
+      expose :created_at, :started_at, :finished_at
+      expose :duration
+      expose :user, with: Entities::User
+      expose :commit, with: Entities::Commit
+      expose :pipeline, with: Entities::PipelineBasic
+
+      expose :web_url do |job, _options|
+        Gitlab::Routing.url_helpers.project_job_url(job.project, job)
+      end
+    end
+  end
+end
diff --git a/lib/api/entities/job_basic_with_project.rb b/lib/api/entities/job_basic_with_project.rb
new file mode 100644
index 00000000000..09387e045ec
--- /dev/null
+++ b/lib/api/entities/job_basic_with_project.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+module API
+  module Entities
+    class JobBasicWithProject < Entities::JobBasic
+      expose :project, with: Entities::ProjectIdentity
+    end
+  end
+end
diff --git a/lib/api/entities/label.rb b/lib/api/entities/label.rb
new file mode 100644
index 00000000000..ca9a0912331
--- /dev/null
+++ b/lib/api/entities/label.rb
@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+module API
+  module Entities
+    class Label < Entities::LabelBasic
+      with_options if: lambda { |_, options| options[:with_counts] } do
+        expose :open_issues_count do |label, options|
+          label.open_issues_count(options[:current_user])
+        end
+
+        expose :closed_issues_count do |label, options|
+          label.closed_issues_count(options[:current_user])
+        end
+
+        expose :open_merge_requests_count do |label, options|
+          label.open_merge_requests_count(options[:current_user])
+        end
+      end
+
+      expose :subscribed do |label, options|
+        label.subscribed?(options[:current_user], options[:parent])
+      end
+    end
+  end
+end
diff --git a/lib/api/entities/label_basic.rb b/lib/api/entities/label_basic.rb
new file mode 100644
index 00000000000..ed52688638e
--- /dev/null
+++ b/lib/api/entities/label_basic.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+module API
+  module Entities
+    class LabelBasic < Grape::Entity
+      expose :id, :name, :color, :description, :description_html, :text_color
+    end
+  end
+end
diff --git a/lib/api/entities/personal_access_token.rb b/lib/api/entities/personal_access_token.rb
new file mode 100644
index 00000000000..d6fb9af6ab3
--- /dev/null
+++ b/lib/api/entities/personal_access_token.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+module API
+  module Entities
+    class PersonalAccessToken < Grape::Entity
+      expose :id, :name, :revoked, :created_at, :scopes
+      expose :active?, as: :active
+      expose :expires_at do |personal_access_token|
+        personal_access_token.expires_at ? personal_access_token.expires_at.strftime("%Y-%m-%d") : nil
+      end
+    end
+  end
+end
diff --git a/lib/api/entities/personal_access_token_with_token.rb b/lib/api/entities/personal_access_token_with_token.rb
new file mode 100644
index 00000000000..84dcd3bc8d8
--- /dev/null
+++ b/lib/api/entities/personal_access_token_with_token.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+module API
+  module Entities
+    class PersonalAccessTokenWithToken < Entities::PersonalAccessToken
+      expose :token
+    end
+  end
+end
diff --git a/lib/api/entities/project_label.rb b/lib/api/entities/project_label.rb
new file mode 100644
index 00000000000..b47a9414ddb
--- /dev/null
+++ b/lib/api/entities/project_label.rb
@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+module API
+  module Entities
+    class ProjectLabel < Entities::Label
+      expose :priority do |label, options|
+        label.priority(options[:parent])
+      end
+      expose :is_project_label do |label, options|
+        label.is_a?(::ProjectLabel)
+      end
+    end
+  end
+end
diff --git a/lib/api/entities/releases/link.rb b/lib/api/entities/releases/link.rb
new file mode 100644
index 00000000000..6cc01e0e981
--- /dev/null
+++ b/lib/api/entities/releases/link.rb
@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+module API
+  module Entities
+    module Releases
+      class Link < Grape::Entity
+        expose :id
+        expose :name
+        expose :url
+        expose :external?, as: :external
+      end
+    end
+  end
+end
diff --git a/lib/api/entities/releases/source.rb b/lib/api/entities/releases/source.rb
new file mode 100644
index 00000000000..2b0c8038ddf
--- /dev/null
+++ b/lib/api/entities/releases/source.rb
@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+module API
+  module Entities
+    module Releases
+      class Source < Grape::Entity
+        expose :format
+        expose :url
+      end
+    end
+  end
+end
diff --git a/lib/api/entities/tag_release.rb b/lib/api/entities/tag_release.rb
new file mode 100644
index 00000000000..d5f73d60332
--- /dev/null
+++ b/lib/api/entities/tag_release.rb
@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+module API
+  module Entities
+    # deprecated old Release representation
+    class TagRelease < Grape::Entity
+      expose :tag, as: :tag_name
+      expose :description
+    end
+  end
+end
diff --git a/lib/api/entities/template.rb b/lib/api/entities/template.rb
new file mode 100644
index 00000000000..ef364d971bf
--- /dev/null
+++ b/lib/api/entities/template.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+module API
+  module Entities
+    class Template < Grape::Entity
+      expose :name, :content
+    end
+  end
+end
diff --git a/lib/api/entities/templates_list.rb b/lib/api/entities/templates_list.rb
new file mode 100644
index 00000000000..8e8aa1bd285
--- /dev/null
+++ b/lib/api/entities/templates_list.rb
@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+module API
+  module Entities
+    class TemplatesList < Grape::Entity
+      expose :key
+      expose :name
+    end
+  end
+end
diff --git a/lib/backup/repository.rb b/lib/backup/repository.rb
index 974e32ce17c..123a695be13 100644
--- a/lib/backup/repository.rb
+++ b/lib/backup/repository.rb
@@ -96,6 +96,7 @@ module Backup
         end
 
         wiki = ProjectWiki.new(project)
+        wiki.repository.remove rescue nil
         path_to_wiki_bundle = path_to_bundle(wiki)
 
         if File.exist?(path_to_wiki_bundle)
diff --git a/spec/controllers/projects/settings/operations_controller_spec.rb b/spec/controllers/projects/settings/operations_controller_spec.rb
index 667a6336952..0a2cc6f6aa5 100644
--- a/spec/controllers/projects/settings/operations_controller_spec.rb
+++ b/spec/controllers/projects/settings/operations_controller_spec.rb
@@ -196,6 +196,39 @@ describe Projects::Settings::OperationsController do
     end
   end
 
+  context 'prometheus integration' do
+    describe 'PATCH #update' do
+      let(:params) do
+        {
+          prometheus_integration_attributes: {
+            manual_configuration: '0',
+            api_url: 'https://gitlab.prometheus.rocks'
+          }
+        }
+      end
+
+      context 'feature flag :settings_operations_prometheus_service is enabled' do
+        before do
+          stub_feature_flags(settings_operations_prometheus_service: true)
+        end
+
+        it_behaves_like 'PATCHable'
+      end
+
+      context 'feature flag :settings_operations_prometheus_service is disabled' do
+        before do
+          stub_feature_flags(settings_operations_prometheus_service: false)
+        end
+
+        it_behaves_like 'PATCHable' do
+          let(:permitted_params) do
+            ActionController::Parameters.new(params.except(:prometheus_integration_attributes)).permit!
+          end
+        end
+      end
+    end
+  end
+
   private
 
   def project_params(project, params = {})
diff --git a/spec/features/merge_request/user_interacts_with_batched_mr_diffs_spec.rb b/spec/features/merge_request/user_interacts_with_batched_mr_diffs_spec.rb
new file mode 100644
index 00000000000..92d90926c0a
--- /dev/null
+++ b/spec/features/merge_request/user_interacts_with_batched_mr_diffs_spec.rb
@@ -0,0 +1,111 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'Batch diffs', :js do
+  include MergeRequestDiffHelpers
+  include RepoHelpers
+
+  let(:project) { create(:project, :repository) }
+  let(:merge_request) { create(:merge_request, source_project: project, source_branch: 'master', target_branch: 'empty-branch') }
+
+  before do
+    stub_feature_flags(single_mr_diff_view: true)
+    stub_feature_flags(diffs_batch_load: true)
+
+    sign_in(project.owner)
+
+    visit diffs_project_merge_request_path(merge_request.project, merge_request)
+    wait_for_requests
+
+    # Add discussion to first line of first file
+    click_diff_line(find('.diff-file.file-holder:first-of-type tr.line_holder.new:first-of-type'))
+    page.within('.js-discussion-note-form') do
+      fill_in('note_note', with: 'First Line Comment')
+      click_button('Comment')
+    end
+
+    # Add discussion to first line of last file
+    click_diff_line(find('.diff-file.file-holder:last-of-type tr.line_holder.new:first-of-type'))
+    page.within('.js-discussion-note-form') do
+      fill_in('note_note', with: 'Last Line Comment')
+      click_button('Comment')
+    end
+
+    wait_for_requests
+  end
+
+  it 'assigns discussions to diff files across multiple batch pages' do
+    # Reload so we know the discussions are persisting across batch loads
+    visit page.current_url
+
+    # Wait for JS to settle
+    wait_for_requests
+
+    expect(page).to have_selector('.diff-files-holder .file-holder', count: 39)
+
+    # Confirm discussions are applied to appropriate files (should be contained in multiple diff pages)
+    page.within('.diff-file.file-holder:first-of-type .notes .timeline-entry .note .note-text') do
+      expect(page).to have_content('First Line Comment')
+    end
+
+    page.within('.diff-file.file-holder:last-of-type .notes .timeline-entry .note .note-text') do
+      expect(page).to have_content('Last Line Comment')
+    end
+  end
+
+  context 'when user visits a URL with a link directly to to a discussion' do
+    context 'which is in the first batched page of diffs' do
+      it 'scrolls to the correct discussion' do
+        page.within('.diff-file.file-holder:first-of-type') do
+          click_link('just now')
+        end
+
+        visit page.current_url
+
+        wait_for_requests
+
+        # Confirm scrolled to correct UI element
+        expect(page.find('.diff-file.file-holder:first-of-type .discussion-notes .timeline-entry li.note[id]').obscured?).to be_falsey
+        expect(page.find('.diff-file.file-holder:last-of-type .discussion-notes .timeline-entry li.note[id]').obscured?).to be_truthy
+      end
+    end
+
+    context 'which is in at least page 2 of the batched pages of diffs' do
+      it 'scrolls to the correct discussion' do
+        page.within('.diff-file.file-holder:last-of-type') do
+          click_link('just now')
+        end
+
+        visit page.current_url
+
+        wait_for_requests
+
+        # Confirm scrolled to correct UI element
+        expect(page.find('.diff-file.file-holder:first-of-type .discussion-notes .timeline-entry li.note[id]').obscured?).to be_truthy
+        expect(page.find('.diff-file.file-holder:last-of-type .discussion-notes .timeline-entry li.note[id]').obscured?).to be_falsey
+      end
+    end
+  end
+
+  context 'when user switches view styles' do
+    before do
+      find('.js-show-diff-settings').click
+      click_button 'Side-by-side'
+
+      wait_for_requests
+    end
+
+    it 'has the correct discussions applied to files across batched pages' do
+      expect(page).to have_selector('.diff-files-holder .file-holder', count: 39)
+
+      page.within('.diff-file.file-holder:first-of-type .notes .timeline-entry .note .note-text') do
+        expect(page).to have_content('First Line Comment')
+      end
+
+      page.within('.diff-file.file-holder:last-of-type .notes .timeline-entry .note .note-text') do
+        expect(page).to have_content('Last Line Comment')
+      end
+    end
+  end
+end
diff --git a/spec/frontend/monitoring/components/charts/single_stat_spec.js b/spec/frontend/monitoring/components/charts/single_stat_spec.js
index 2410dae112b..1aa7ba867b4 100644
--- a/spec/frontend/monitoring/components/charts/single_stat_spec.js
+++ b/spec/frontend/monitoring/components/charts/single_stat_spec.js
@@ -18,9 +18,53 @@ describe('Single Stat Chart component', () => {
   });
 
   describe('computed', () => {
-    describe('engineeringNotation', () => {
+    describe('statValue', () => {
       it('should interpolate the value and unit props', () => {
-        expect(singleStatChart.vm.engineeringNotation).toBe('91MB');
+        expect(singleStatChart.vm.statValue).toBe('91MB');
+      });
+
+      it('should change the value representation to a percentile one', () => {
+        singleStatChart.setProps({
+          graphData: {
+            ...graphDataPrometheusQuery,
+            max_value: 120,
+          },
+        });
+
+        expect(singleStatChart.vm.statValue).toContain('75.8');
+      });
+
+      it('should display NaN for non numeric max_value values', () => {
+        singleStatChart.setProps({
+          graphData: {
+            ...graphDataPrometheusQuery,
+            max_value: 'not a number',
+          },
+        });
+
+        expect(singleStatChart.vm.statValue).toContain('NaN');
+      });
+
+      it('should display NaN for missing query values', () => {
+        singleStatChart.setProps({
+          graphData: {
+            ...graphDataPrometheusQuery,
+            metrics: [
+              {
+                ...graphDataPrometheusQuery.metrics[0],
+                result: [
+                  {
+                    ...graphDataPrometheusQuery.metrics[0].result[0],
+                    value: [''],
+                  },
+                ],
+              },
+            ],
+            max_value: 120,
+          },
+        });
+
+        expect(singleStatChart.vm.statValue).toContain('NaN');
       });
     });
   });
diff --git a/spec/javascripts/diffs/store/actions_spec.js b/spec/javascripts/diffs/store/actions_spec.js
index af2dd7b4f93..ff17d8ec158 100644
--- a/spec/javascripts/diffs/store/actions_spec.js
+++ b/spec/javascripts/diffs/store/actions_spec.js
@@ -158,16 +158,19 @@ describe('DiffsStoreActions', () => {
       const res1 = { diff_files: [], pagination: { next_page: 2 } };
       const res2 = { diff_files: [], pagination: {} };
       mock
-        .onGet(endpointBatch, { params: { page: undefined, per_page: DIFFS_PER_PAGE, w: '1' } })
-        .reply(200, res1);
-      mock
-        .onGet(endpointBatch, { params: { page: 2, per_page: DIFFS_PER_PAGE, w: '1' } })
+        .onGet(endpointBatch, {
+          params: { page: 1, per_page: DIFFS_PER_PAGE, w: '1', view: 'inline' },
+        })
+        .reply(200, res1)
+        .onGet(endpointBatch, {
+          params: { page: 2, per_page: DIFFS_PER_PAGE, w: '1', view: 'inline' },
+        })
         .reply(200, res2);
 
       testAction(
         fetchDiffFilesBatch,
         {},
-        { endpointBatch },
+        { endpointBatch, useSingleDiffStyle: true, diffViewType: 'inline' },
         [
           { type: types.SET_BATCH_LOADING, payload: true },
           { type: types.SET_RETRIEVING_BATCHES, payload: true },
@@ -188,7 +191,7 @@ describe('DiffsStoreActions', () => {
 
   describe('fetchDiffFilesMeta', () => {
     it('should fetch diff meta information', done => {
-      const endpointMetadata = '/fetch/diffs_meta';
+      const endpointMetadata = '/fetch/diffs_meta?view=inline';
       const mock = new MockAdapter(axios);
       const data = { diff_files: [] };
       const res = { data };
@@ -213,6 +216,108 @@ describe('DiffsStoreActions', () => {
     });
   });
 
+  describe('when the single diff view feature flag is off', () => {
+    describe('fetchDiffFiles', () => {
+      it('should fetch diff files', done => {
+        const endpoint = '/fetch/diff/files?w=1';
+        const mock = new MockAdapter(axios);
+        const res = { diff_files: 1, merge_request_diffs: [] };
+        mock.onGet(endpoint).reply(200, res);
+
+        testAction(
+          fetchDiffFiles,
+          {},
+          {
+            endpoint,
+            diffFiles: [],
+            showWhitespace: false,
+            diffViewType: 'inline',
+            useSingleDiffStyle: false,
+          },
+          [
+            { type: types.SET_LOADING, payload: true },
+            { type: types.SET_LOADING, payload: false },
+            { type: types.SET_MERGE_REQUEST_DIFFS, payload: res.merge_request_diffs },
+            { type: types.SET_DIFF_DATA, payload: res },
+          ],
+          [],
+          () => {
+            mock.restore();
+            done();
+          },
+        );
+
+        fetchDiffFiles({ state: { endpoint }, commit: () => null })
+          .then(data => {
+            expect(data).toEqual(res);
+            done();
+          })
+          .catch(done.fail);
+      });
+    });
+
+    describe('fetchDiffFilesBatch', () => {
+      it('should fetch batch diff files', done => {
+        const endpointBatch = '/fetch/diffs_batch';
+        const mock = new MockAdapter(axios);
+        const res1 = { diff_files: [], pagination: { next_page: 2 } };
+        const res2 = { diff_files: [], pagination: {} };
+        mock
+          .onGet(endpointBatch, { params: { page: 1, per_page: DIFFS_PER_PAGE, w: '1' } })
+          .reply(200, res1)
+          .onGet(endpointBatch, { params: { page: 2, per_page: DIFFS_PER_PAGE, w: '1' } })
+          .reply(200, res2);
+
+        testAction(
+          fetchDiffFilesBatch,
+          {},
+          { endpointBatch, useSingleDiffStyle: false },
+          [
+            { type: types.SET_BATCH_LOADING, payload: true },
+            { type: types.SET_RETRIEVING_BATCHES, payload: true },
+            { type: types.SET_DIFF_DATA_BATCH, payload: { diff_files: res1.diff_files } },
+            { type: types.SET_BATCH_LOADING, payload: false },
+            { type: types.SET_DIFF_DATA_BATCH, payload: { diff_files: [] } },
+            { type: types.SET_BATCH_LOADING, payload: false },
+            { type: types.SET_RETRIEVING_BATCHES, payload: false },
+          ],
+          [],
+          () => {
+            mock.restore();
+            done();
+          },
+        );
+      });
+    });
+
+    describe('fetchDiffFilesMeta', () => {
+      it('should fetch diff meta information', done => {
+        const endpointMetadata = '/fetch/diffs_meta?';
+        const mock = new MockAdapter(axios);
+        const data = { diff_files: [] };
+        const res = { data };
+        mock.onGet(endpointMetadata).reply(200, res);
+
+        testAction(
+          fetchDiffFilesMeta,
+          {},
+          { endpointMetadata, useSingleDiffStyle: false },
+          [
+            { type: types.SET_LOADING, payload: true },
+            { type: types.SET_LOADING, payload: false },
+            { type: types.SET_MERGE_REQUEST_DIFFS, payload: [] },
+            { type: types.SET_DIFF_DATA, payload: { data } },
+          ],
+          [],
+          () => {
+            mock.restore();
+            done();
+          },
+        );
+      });
+    });
+  });
+
   describe('setHighlightedRow', () => {
     it('should mark currently selected diff and set lineHash and fileHash of highlightedRow', () => {
       testAction(setHighlightedRow, 'ABC_123', {}, [
diff --git a/spec/javascripts/diffs/store/mutations_spec.js b/spec/javascripts/diffs/store/mutations_spec.js
index 24405dcc796..cb89a89e216 100644
--- a/spec/javascripts/diffs/store/mutations_spec.js
+++ b/spec/javascripts/diffs/store/mutations_spec.js
@@ -55,8 +55,8 @@ describe('DiffsStoreMutations', () => {
       const state = {
         diffFiles: [
           {
-            content_sha: diffFileMockData.content_sha,
-            file_hash: diffFileMockData.file_hash,
+            ...diffFileMockData,
+            parallel_diff_lines: [],
           },
         ],
       };
diff --git a/spec/javascripts/diffs/store/utils_spec.js b/spec/javascripts/diffs/store/utils_spec.js
index 638b4510221..051820cedfa 100644
--- a/spec/javascripts/diffs/store/utils_spec.js
+++ b/spec/javascripts/diffs/store/utils_spec.js
@@ -333,10 +333,10 @@ describe('DiffsStoreUtils', () => {
         diff_files: [Object.assign({}, mock, { highlighted_diff_lines: undefined })],
       };
 
-      utils.prepareDiffData(preparedDiff);
-      utils.prepareDiffData(splitInlineDiff);
-      utils.prepareDiffData(splitParallelDiff);
-      utils.prepareDiffData(completedDiff, [mock]);
+      preparedDiff.diff_files = utils.prepareDiffData(preparedDiff);
+      splitInlineDiff.diff_files = utils.prepareDiffData(splitInlineDiff);
+      splitParallelDiff.diff_files = utils.prepareDiffData(splitParallelDiff);
+      completedDiff.diff_files = utils.prepareDiffData(completedDiff, [mock]);
     });
 
     it('sets the renderIt and collapsed attribute on files', () => {
@@ -390,6 +390,37 @@ describe('DiffsStoreUtils', () => {
       expect(completedDiff.diff_files[0].parallel_diff_lines.length).toBeGreaterThan(0);
       expect(completedDiff.diff_files[0].highlighted_diff_lines.length).toBeGreaterThan(0);
     });
+
+    it('leaves files in the existing state', () => {
+      const priorFiles = [mock];
+      const fakeNewFile = {
+        ...mock,
+        content_sha: 'ABC',
+        file_hash: 'DEF',
+      };
+      const updatedFilesList = utils.prepareDiffData({ diff_files: [fakeNewFile] }, priorFiles);
+
+      expect(updatedFilesList).toEqual([mock, fakeNewFile]);
+    });
+
+    it('completes an existing split diff without overwriting existing diffs', () => {
+      // The current state has a file that has only loaded inline lines
+      const priorFiles = [{ ...mock, parallel_diff_lines: [] }];
+      // The next (batch) load loads two files: the other half of that file, and a new file
+      const fakeBatch = [
+        { ...mock, highlighted_diff_lines: undefined },
+        { ...mock, highlighted_diff_lines: undefined, content_sha: 'ABC', file_hash: 'DEF' },
+      ];
+      const updatedFilesList = utils.prepareDiffData({ diff_files: fakeBatch }, priorFiles);
+
+      expect(updatedFilesList).toEqual([
+        mock,
+        jasmine.objectContaining({
+          content_sha: 'ABC',
+          file_hash: 'DEF',
+        }),
+      ]);
+    });
   });
 
   describe('isDiscussionApplicableToLine', () => {
diff --git a/spec/lib/backup/repository_spec.rb b/spec/lib/backup/repository_spec.rb
index 32e718d4b3b..2ac1b0d2583 100644
--- a/spec/lib/backup/repository_spec.rb
+++ b/spec/lib/backup/repository_spec.rb
@@ -86,6 +86,22 @@ describe Backup::Repository do
         expect(pool_repository.object_pool.exists?).to be(true)
       end
     end
+
+    it 'cleans existing repositories' do
+      wiki_repository_spy = spy(:wiki)
+
+      allow_next_instance_of(ProjectWiki) do |project_wiki|
+        allow(project_wiki).to receive(:repository).and_return(wiki_repository_spy)
+      end
+
+      expect_next_instance_of(Repository) do |repo|
+        expect(repo).to receive(:remove)
+      end
+
+      subject.restore
+
+      expect(wiki_repository_spy).to have_received(:remove)
+    end
   end
 
   describe '#empty_repo?' do
diff --git a/spec/services/projects/operations/update_service_spec.rb b/spec/services/projects/operations/update_service_spec.rb
index dce0ee05b1f..792036273d6 100644
--- a/spec/services/projects/operations/update_service_spec.rb
+++ b/spec/services/projects/operations/update_service_spec.rb
@@ -289,5 +289,86 @@ describe Projects::Operations::UpdateService do
         end
       end
     end
+
+    context 'prometheus integration' do
+      context 'prometheus params were passed into service' do
+        let(:prometheus_service) do
+          build_stubbed(:prometheus_service, project: project, properties: {
+            api_url: "http://example.prometheus.com",
+            manual_configuration: "0"
+          })
+        end
+        let(:prometheus_params) do
+          {
+            "type" => "PrometheusService",
+            "title" => nil,
+            "active" => true,
+            "properties" => { "api_url" => "http://example.prometheus.com", "manual_configuration" => "0" },
+            "instance" => false,
+            "push_events" => true,
+            "issues_events" => true,
+            "merge_requests_events" => true,
+            "tag_push_events" => true,
+            "note_events" => true,
+            "category" => "monitoring",
+            "default" => false,
+            "wiki_page_events" => true,
+            "pipeline_events" => true,
+            "confidential_issues_events" => true,
+            "commit_events" => true,
+            "job_events" => true,
+            "confidential_note_events" => true,
+            "deployment_events" => false,
+            "description" => nil,
+            "comment_on_event_enabled" => true
+          }
+        end
+        let(:params) do
+          {
+            prometheus_integration_attributes: {
+              api_url: 'http://new.prometheus.com',
+              manual_configuration: '1'
+            }
+          }
+        end
+
+        it 'uses Project#find_or_initialize_service to include instance defined defaults and pass them to Projects::UpdateService', :aggregate_failures do
+          project_update_service = double(Projects::UpdateService)
+          prometheus_update_params = prometheus_params.merge('properties' => {
+            'api_url' => 'http://new.prometheus.com',
+            'manual_configuration' => '1'
+          })
+
+          expect(project)
+            .to receive(:find_or_initialize_service)
+            .with('prometheus')
+            .and_return(prometheus_service)
+          expect(Projects::UpdateService)
+            .to receive(:new)
+            .with(project, user, { prometheus_service_attributes: prometheus_update_params })
+            .and_return(project_update_service)
+          expect(project_update_service).to receive(:execute)
+
+          subject.execute
+        end
+      end
+
+      context 'prometheus params were not passed into service' do
+        let(:params) { { something: :else } }
+
+        it 'does not pass any prometheus params into Projects::UpdateService', :aggregate_failures do
+          project_update_service = double(Projects::UpdateService)
+
+          expect(project).not_to receive(:find_or_initialize_service)
+          expect(Projects::UpdateService)
+            .to receive(:new)
+            .with(project, user, {})
+            .and_return(project_update_service)
+          expect(project_update_service).to receive(:execute)
+
+          subject.execute
+        end
+      end
+    end
   end
 end
diff --git a/spec/services/projects/update_service_spec.rb b/spec/services/projects/update_service_spec.rb
index 3092fb7116a..90fb6b932ee 100644
--- a/spec/services/projects/update_service_spec.rb
+++ b/spec/services/projects/update_service_spec.rb
@@ -497,6 +497,63 @@ describe Projects::UpdateService do
         update_project(project, user, { name: 'New name' })
       end
     end
+
+    context 'when updating nested attributes for prometheus service' do
+      context 'prometheus service exists' do
+        let(:prometheus_service_attributes) do
+          attributes_for(:prometheus_service,
+                         project: project,
+                         properties: { api_url: "http://new.prometheus.com", manual_configuration: "0" }
+          )
+        end
+
+        let!(:prometheus_service) do
+          create(:prometheus_service,
+                 project: project,
+                 properties: { api_url: "http://old.prometheus.com", manual_configuration: "0" }
+          )
+        end
+
+        it 'updates existing record' do
+          expect { update_project(project, user, prometheus_service_attributes: prometheus_service_attributes) }
+            .to change { prometheus_service.reload.api_url }
+            .from("http://old.prometheus.com")
+            .to("http://new.prometheus.com")
+        end
+      end
+
+      context 'prometheus service does not exist' do
+        context 'valid parameters' do
+          let(:prometheus_service_attributes) do
+            attributes_for(:prometheus_service,
+                           project: project,
+                           properties: { api_url: "http://example.prometheus.com", manual_configuration: "0" }
+            )
+          end
+
+          it 'creates new record' do
+            expect { update_project(project, user, prometheus_service_attributes: prometheus_service_attributes) }
+              .to change { ::PrometheusService.where(project: project).count }
+              .from(0)
+              .to(1)
+          end
+        end
+
+        context 'invalid parameters' do
+          let(:prometheus_service_attributes) do
+            attributes_for(:prometheus_service,
+                           project: project,
+                           properties: { api_url: nil, manual_configuration: "1" }
+            )
+          end
+
+          it 'does not create new record' do
+            expect { update_project(project, user, prometheus_service_attributes: prometheus_service_attributes) }
+              .not_to change { ::PrometheusService.where(project: project).count }
+          end
+        end
+      end
+    end
   end
 
   describe '#run_auto_devops_pipeline?' do
diff --git a/yarn.lock b/yarn.lock
index cffb5809a2b..ce6a0e94fc1 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5413,9 +5413,9 @@ handle-thing@^2.0.0:
   integrity sha512-d4sze1JNC454Wdo2fkuyzCr6aHcbL6PGGuFAz0Li/NcOm1tCHGnWDRmJP85dh9IhQErTc2svWFEX5xHIOo//kQ==
 
 handlebars@^4.1.2:
-  version "4.1.2"
-  resolved "https://registry.yarnpkg.com/handlebars/-/handlebars-4.1.2.tgz#b6b37c1ced0306b221e094fc7aca3ec23b131b67"
-  integrity sha512-nvfrjqvt9xQ8Z/w0ijewdD/vvWDTOweBUm96NTr66Wfvo1mJenBLwcYmPs3TIBP5ruzYGD7Hx/DaM9RmhroGPw==
+  version "4.7.2"
+  resolved "https://registry.yarnpkg.com/handlebars/-/handlebars-4.7.2.tgz#01127b3840156a0927058779482031afe0e730d7"
+  integrity sha512-4PwqDL2laXtTWZghzzCtunQUTLbo31pcCJrd/B/9JP8XbhVzpS5ZXuKqlOzsd1rtcaLo4KqAn8nl8mkknS4MHw==
   dependencies:
     neo-async "^2.6.0"
     optimist "^0.6.1"