diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index dc6249100bd..edb3921609d 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -666,12 +666,6 @@ Style/RedundantFreeze:
 Style/RedundantInterpolation:
   Enabled: false
 
-# Offense count: 33
-# Cop supports --auto-correct.
-# Configuration parameters: AllowMultipleReturnValues.
-Style/RedundantReturn:
-  Enabled: false
-
 # Offense count: 801
 # Cop supports --auto-correct.
 Style/RedundantSelf:
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 789213a5fc6..2595b646964 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -306,7 +306,7 @@ class ApplicationController < ActionController::Base
     return if session[:impersonator_id] || !current_user&.allow_password_authentication?
 
     if current_user&.password_expired?
-      return redirect_to new_profile_password_path
+      redirect_to new_profile_password_path
     end
   end
 
@@ -364,7 +364,7 @@ class ApplicationController < ActionController::Base
 
   def require_email
     if current_user && current_user.temp_oauth_email? && session[:impersonator_id].nil?
-      return redirect_to profile_path, notice: _('Please complete your profile with email address')
+      redirect_to profile_path, notice: _('Please complete your profile with email address')
     end
   end
 
diff --git a/app/controllers/chaos_controller.rb b/app/controllers/chaos_controller.rb
index ac008165c16..e0d1f313fc7 100644
--- a/app/controllers/chaos_controller.rb
+++ b/app/controllers/chaos_controller.rb
@@ -45,7 +45,6 @@ class ChaosController < ActionController::Base
     unless Devise.secure_compare(chaos_secret_configured, chaos_secret_request)
       render plain: "To experience chaos, please set a valid `X-Chaos-Secret` header or `token` param",
              status: :unauthorized
-      return
     end
   end
 
diff --git a/app/controllers/concerns/issuable_actions.rb b/app/controllers/concerns/issuable_actions.rb
index 068b7bdae2a..c4dbce00593 100644
--- a/app/controllers/concerns/issuable_actions.rb
+++ b/app/controllers/concerns/issuable_actions.rb
@@ -197,13 +197,13 @@ module IssuableActions
 
   def authorize_destroy_issuable!
     unless can?(current_user, :"destroy_#{issuable.to_ability_name}", issuable)
-      return access_denied!
+      access_denied!
     end
   end
 
   def authorize_admin_issuable!
     unless can?(current_user, :"admin_#{resource_name}", parent)
-      return access_denied!
+      access_denied!
     end
   end
 
diff --git a/app/controllers/groups/application_controller.rb b/app/controllers/groups/application_controller.rb
index 84c8d7ada43..9c2e361e92f 100644
--- a/app/controllers/groups/application_controller.rb
+++ b/app/controllers/groups/application_controller.rb
@@ -30,25 +30,25 @@ class Groups::ApplicationController < ApplicationController
 
   def authorize_admin_group!
     unless can?(current_user, :admin_group, group)
-      return render_404
+      render_404
     end
   end
 
   def authorize_create_deploy_token!
     unless can?(current_user, :create_deploy_token, group)
-      return render_404
+      render_404
     end
   end
 
   def authorize_destroy_deploy_token!
     unless can?(current_user, :destroy_deploy_token, group)
-      return render_404
+      render_404
     end
   end
 
   def authorize_admin_group_member!
     unless can?(current_user, :admin_group_member, group)
-      return render_403
+      render_403
     end
   end
 
diff --git a/app/controllers/omniauth_callbacks_controller.rb b/app/controllers/omniauth_callbacks_controller.rb
index 4c595313cb6..706a4843117 100644
--- a/app/controllers/omniauth_callbacks_controller.rb
+++ b/app/controllers/omniauth_callbacks_controller.rb
@@ -200,7 +200,7 @@ class OmniauthCallbacksController < Devise::OmniauthCallbacksController
   def fail_login(user)
     error_message = user.errors.full_messages.to_sentence
 
-    return redirect_to omniauth_error_path(oauth['provider'], error: error_message)
+    redirect_to omniauth_error_path(oauth['provider'], error: error_message)
   end
 
   def fail_auth0_login
diff --git a/app/controllers/projects/application_controller.rb b/app/controllers/projects/application_controller.rb
index 82f98a9e411..d78a9bf0666 100644
--- a/app/controllers/projects/application_controller.rb
+++ b/app/controllers/projects/application_controller.rb
@@ -42,7 +42,7 @@ class Projects::ApplicationController < ApplicationController
 
   def authorize_action!(action)
     unless can?(current_user, action, project)
-      return access_denied!
+      access_denied!
     end
   end
 
diff --git a/app/controllers/projects/blob_controller.rb b/app/controllers/projects/blob_controller.rb
index 80c5fb470dd..49f658d9ffc 100644
--- a/app/controllers/projects/blob_controller.rb
+++ b/app/controllers/projects/blob_controller.rb
@@ -129,7 +129,7 @@ class Projects::BlobController < Projects::ApplicationController
         end
       end
 
-      return redirect_to_tree_root_for_missing_path(@project, @ref, @path)
+      redirect_to_tree_root_for_missing_path(@project, @ref, @path)
     end
   end
 
diff --git a/app/controllers/projects/releases_controller.rb b/app/controllers/projects/releases_controller.rb
index 3d48fb9c803..d58755c2655 100644
--- a/app/controllers/projects/releases_controller.rb
+++ b/app/controllers/projects/releases_controller.rb
@@ -30,7 +30,7 @@ class Projects::ReleasesController < Projects::ApplicationController
 
   def new
     unless Feature.enabled?(:new_release_page, project)
-      return redirect_to(new_project_tag_path(@project))
+      redirect_to(new_project_tag_path(@project))
     end
   end
 
diff --git a/app/controllers/projects/tree_controller.rb b/app/controllers/projects/tree_controller.rb
index aadc766313d..638e1a05c18 100644
--- a/app/controllers/projects/tree_controller.rb
+++ b/app/controllers/projects/tree_controller.rb
@@ -20,9 +20,9 @@ class Projects::TreeController < Projects::ApplicationController
 
     if tree.entries.empty?
       if @repository.blob_at(@commit.id, @path)
-        return redirect_to project_blob_path(@project, File.join(@ref, @path))
+        redirect_to project_blob_path(@project, File.join(@ref, @path))
       elsif @path.present?
-        return redirect_to_tree_root_for_missing_path(@project, @ref, @path)
+        redirect_to_tree_root_for_missing_path(@project, @ref, @path)
       end
     end
   end
diff --git a/app/graphql/resolvers/projects/jira_projects_resolver.rb b/app/graphql/resolvers/projects/jira_projects_resolver.rb
index 3b6e5c4fd42..2dc712128cc 100644
--- a/app/graphql/resolvers/projects/jira_projects_resolver.rb
+++ b/app/graphql/resolvers/projects/jira_projects_resolver.rb
@@ -37,7 +37,7 @@ module Resolvers
       def jira_projects(name:)
         args = { query: name }.compact
 
-        return Jira::Requests::Projects::ListService.new(project.jira_service, args).execute
+        Jira::Requests::Projects::ListService.new(project.jira_service, args).execute
       end
     end
   end
diff --git a/app/services/access_token_validation_service.rb b/app/services/access_token_validation_service.rb
index 851d862c0cf..eb2e66a9285 100644
--- a/app/services/access_token_validation_service.rb
+++ b/app/services/access_token_validation_service.rb
@@ -17,21 +17,21 @@ class AccessTokenValidationService
 
   def validate(scopes: [])
     if token.expired?
-      return EXPIRED
+      EXPIRED
 
     elsif token.revoked?
-      return REVOKED
+      REVOKED
 
     elsif !self.include_any_scope?(scopes)
-      return INSUFFICIENT_SCOPE
+      INSUFFICIENT_SCOPE
 
     elsif token.respond_to?(:impersonation) &&
         token.impersonation &&
         !Gitlab.config.gitlab.impersonation_enabled
-      return IMPERSONATION_DISABLED
+      IMPERSONATION_DISABLED
 
     else
-      return VALID
+      VALID
     end
   end
 
diff --git a/app/services/spam/spam_verdict_service.rb b/app/services/spam/spam_verdict_service.rb
index be156a0ebeb..ba1c583c7af 100644
--- a/app/services/spam/spam_verdict_service.rb
+++ b/app/services/spam/spam_verdict_service.rb
@@ -57,7 +57,7 @@ module Spam
       rescue *Gitlab::HTTP::HTTP_ERRORS => e
         # @TODO: log error via try_post https://gitlab.com/gitlab-org/gitlab/-/issues/219223
         Gitlab::ErrorTracking.log_exception(e)
-        return
+        nil
       rescue
         # @TODO log
         ALLOW
diff --git a/app/workers/delete_merged_branches_worker.rb b/app/workers/delete_merged_branches_worker.rb
index ab3d42e5384..8d7026e2d1e 100644
--- a/app/workers/delete_merged_branches_worker.rb
+++ b/app/workers/delete_merged_branches_worker.rb
@@ -17,7 +17,6 @@ class DeleteMergedBranchesWorker # rubocop:disable Scalability/IdempotentWorker
     begin
       ::Branches::DeleteMergedService.new(project, user).execute
     rescue Gitlab::Access::AccessDeniedError
-      return
     end
   end
 end
diff --git a/doc/operations/metrics/dashboards/templating_variables.md b/doc/operations/metrics/dashboards/templating_variables.md
new file mode 100644
index 00000000000..a515742ea92
--- /dev/null
+++ b/doc/operations/metrics/dashboards/templating_variables.md
@@ -0,0 +1,128 @@
+---
+stage: Monitor
+group: APM
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
+# Templating variables for metrics dashboards
+
+> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/214539) in GitLab 13.0.
+
+Templating variables can be used to make your metrics dashboard more versatile.
+
+`templating` is a top-level key in the
+[dashboard YAML](yaml.md#dashboard-top-level-properties).
+Define your variables in the `variables` key, under `templating`. The value of
+the `variables` key should be a hash, and each key under `variables`
+defines a templating variable on the dashboard, and may contain alphanumeric and underscore characters.
+
+A variable can be used in a Prometheus query in the same dashboard using the syntax
+described [in Using Variables](variables.md).
+
+## `text` variable type
+
+CAUTION: **Warning:**
+This variable type is an _alpha_ feature, and is subject to change at any time
+without prior notice!
+
+For each `text` variable defined in the dashboard YAML, there will be a free text
+box on the dashboard UI, allowing you to enter a value for each variable.
+
+The `text` variable type supports a simple and a full syntax.
+
+### Simple syntax
+
+This example creates a variable called `variable1`, with a default value
+of `default value`:
+
+```yaml
+templating:
+  variables:
+    variable1: 'default value'     # `text` type variable with `default value` as its default.
+```
+
+### Full syntax
+
+This example creates a variable called `variable1`, with a default value of `default`.
+The label for the text box on the UI will be the value of the `label` key:
+
+```yaml
+templating:
+  variables:
+    variable1:                       # The variable name that can be used in queries.
+      label: 'Variable 1'            # (Optional) label that will appear in the UI for this text box.
+      type: text
+      options:
+        default_value: 'default'     # (Optional) default value.
+```
+
+## `custom` variable type
+
+CAUTION: **Warning:**
+This variable type is an _alpha_ feature, and is subject to change at any time
+without prior notice!
+
+Each `custom` variable defined in the dashboard YAML creates a dropdown
+selector on the dashboard UI, allowing you to select a value for each variable.
+
+The `custom` variable type supports a simple and a full syntax.
+
+### Simple syntax
+
+This example creates a variable called `variable1`, with a default value of `value1`.
+The dashboard UI will display a dropdown with `value1`, `value2` and `value3`
+as the choices.
+
+```yaml
+templating:
+  variables:
+    variable1: ['value1', 'value2', 'value3']
+```
+
+### Full syntax
+
+This example creates a variable called `variable1`, with a default value of `value_option_2`.
+The label for the text box on the UI will be the value of the `label` key.
+The dashboard UI will display a dropdown with `Option 1` and `Option 2`
+as the choices.
+
+If you select `Option 1` from the dropdown, the variable will be replaced with `value option 1`.
+Similarly, if you select `Option 2`, the variable will be replaced with `value_option_2`:
+
+```yaml
+templating:
+  variables:
+    variable1:                           # The variable name that can be used in queries.
+      label: 'Variable 1'                # (Optional) label that will appear in the UI for this dropdown.
+      type: custom
+      options:
+        values:
+          - value: 'value option 1'        # The value that will replace the variable in queries.
+            text: 'Option 1'               # (Optional) Text that will appear in the UI dropdown.
+          - value: 'value_option_2'
+            text: 'Option 2'
+            default: true                  # (Optional) This option should be the default value of this variable.
+```
+
+## `metric_label_values` variable type
+
+CAUTION: **Warning:**
+This variable type is an _alpha_ feature, and is subject to change at any time
+without prior notice!
+
+### Full syntax
+
+This example creates a variable called `variable2`. The values of the dropdown will
+be all the different values of the `backend` label in the Prometheus series described by
+`up{env="production"}`.
+
+```yaml
+templating:
+  variables:
+    variable2:                           # The variable name that can be interpolated in queries.
+      label: 'Variable 2'                # (Optional) label that will appear in the UI for this dropdown.
+      type: metric_label_values
+      options:
+        series_selector: 'up{env="production"}'
+        label: 'backend'
+```
diff --git a/doc/operations/metrics/dashboards/variables.md b/doc/operations/metrics/dashboards/variables.md
new file mode 100644
index 00000000000..19b77a1ed87
--- /dev/null
+++ b/doc/operations/metrics/dashboards/variables.md
@@ -0,0 +1,59 @@
+---
+stage: Monitor
+group: APM
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
+# Using Variables
+
+## Query Variables
+
+Variables can be specified using double curly braces, such as `"{{ci_environment_slug}}"` ([added](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/20793) in GitLab 12.7).
+
+Support for the `"%{ci_environment_slug}"` format was
+[removed](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/31581) in GitLab 13.0.
+Queries that continue to use the old format will show no data.
+
+## Predefined variables
+
+GitLab supports a limited set of [CI variables](../../../ci/variables/README.md) in the Prometheus query. This is particularly useful for identifying a specific environment, for example with `ci_environment_slug`. The supported variables are:
+
+- `ci_environment_slug`
+- `kube_namespace`
+- `ci_project_name`
+- `ci_project_namespace`
+- `ci_project_path`
+- `ci_environment_name`
+- `__range`
+
+NOTE: **Note:**
+Variables for Prometheus queries must be lowercase.
+
+### __range
+
+The `__range` variable is useful in Prometheus
+[range vector selectors](https://prometheus.io/docs/prometheus/latest/querying/basics/#range-vector-selectors).
+Its value is the total number of seconds in the dashboard's time range.
+For example, if the dashboard time range is set to 8 hours, the value of
+`__range` is `28800s`.
+
+## User-defined variables
+
+[Variables can be defined](../../../operations/metrics/dashboards/yaml.md#templating-templating-properties) in a custom dashboard YAML file.
+
+## Query Variables from URL
+
+> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/214500) in GitLab 13.0.
+
+GitLab supports setting custom variables through URL parameters. Surround the variable
+name with double curly braces (`{{example}}`) to interpolate the variable in a query:
+
+```plaintext
+avg(sum(container_memory_usage_bytes{container_name!="{{pod}}"}) by (job)) without (job)  /1024/1024/1024'
+```
+
+The URL for this query would be:
+
+```plaintext
+http://gitlab.com/<user>/<project>/-/environments/<environment_id>/metrics?dashboard=.gitlab%2Fdashboards%2Fcustom.yml&pod=POD
+```
diff --git a/doc/operations/metrics/dashboards/yaml.md b/doc/operations/metrics/dashboards/yaml.md
index 501bfd29eb5..78d05b79492 100644
--- a/doc/operations/metrics/dashboards/yaml.md
+++ b/doc/operations/metrics/dashboards/yaml.md
@@ -29,7 +29,7 @@ The following tables outline the details of expected properties.
 | -------- | ---- | -------- | ----------- |
 | `variables` | hash | yes | Variables can be defined here. |
 
-Read the documentation on [templating](../../../user/project/integrations/prometheus.md#templating-variables-for-metrics-dashboards).
+Read the documentation on [templating](templating_variables.md).
 
 ## **Links (`links`) properties**
 
diff --git a/doc/user/admin_area/merge_requests_approvals.md b/doc/user/admin_area/merge_requests_approvals.md
index f380ff7b211..ac5ac98c54d 100644
--- a/doc/user/admin_area/merge_requests_approvals.md
+++ b/doc/user/admin_area/merge_requests_approvals.md
@@ -58,13 +58,13 @@ Maintainer role and above can modify these.
 
 This feature comes with two feature flags which are disabled by default.
 
-- The configuration in Admin area is controlled via `admin_merge_request_approval_settings`
-- The application of these rules is controlled via `project_merge_request_approval_settings`
+- The configuration in Admin area is controlled via `admin_compliance_merge_request_approval_settings`.
+- The application of these rules is controlled via `project_compliance_merge_request_approval_settings`.
 
 These feature flags can be managed by feature flag [API endpoint](../../api/features.md#set-or-create-a-feature) or
 by [GitLab administrators with access to the GitLab Rails console](../../administration/feature_flags.md) with the following commands:
 
 ```ruby
-Feature.enable(:admin_merge_request_approval_settings)
-Feature.enable(:project_merge_request_approval_settings)
+Feature.enable(:admin_compliance_merge_request_approval_settings)
+Feature.enable(:project_compliance_merge_request_approval_settings)
 ```
diff --git a/doc/user/project/clusters/add_remove_clusters.md b/doc/user/project/clusters/add_remove_clusters.md
index 7deab9aae85..f581383022e 100644
--- a/doc/user/project/clusters/add_remove_clusters.md
+++ b/doc/user/project/clusters/add_remove_clusters.md
@@ -153,11 +153,6 @@ Amazon Elastic Kubernetes Service (EKS) at the project, group, or instance level
 
 If you have an existing Kubernetes cluster, you can add it to a project, group, or instance.
 
-For more information, see information for adding an:
-
-- [Existing Kubernetes cluster](#existing-kubernetes-cluster), including GKE clusters.
-- [Existing EKS cluster](add_eks_clusters.md#existing-eks-cluster).
-
 NOTE: **Note:**
 Kubernetes integration is not supported for arm64 clusters. See the issue
 [Helm Tiller fails to install on arm64 cluster](https://gitlab.com/gitlab-org/gitlab/-/issues/29838) for details.
diff --git a/doc/user/project/integrations/prometheus.md b/doc/user/project/integrations/prometheus.md
index 445516b29cc..f038aa4a7de 100644
--- a/doc/user/project/integrations/prometheus.md
+++ b/doc/user/project/integrations/prometheus.md
@@ -168,60 +168,6 @@ A few fields are required:
 
 Multiple metrics can be displayed on the same chart if the fields **Name**, **Type**, and **Y-axis label** match between metrics. For example, a metric with **Name** `Requests Rate`, **Type** `Business`, and **Y-axis label** `rec / sec` would display on the same chart as a second metric with the same values. A **Legend label** is suggested if this feature is used.
 
-#### Query Variables
-
-##### Predefined variables
-
-GitLab supports a limited set of [CI variables](../../../ci/variables/README.md) in the Prometheus query. This is particularly useful for identifying a specific environment, for example with `ci_environment_slug`. The supported variables are:
-
-- `ci_environment_slug`
-- `kube_namespace`
-- `ci_project_name`
-- `ci_project_namespace`
-- `ci_project_path`
-- `ci_environment_name`
-- `__range`
-
-NOTE: **Note:**
-Variables for Prometheus queries must be lowercase.
-
-###### __range
-
-The `__range` variable is useful in Prometheus
-[range vector selectors](https://prometheus.io/docs/prometheus/latest/querying/basics/#range-vector-selectors).
-Its value is the total number of seconds in the dashboard's time range.
-For example, if the dashboard time range is set to 8 hours, the value of
-`__range` is `28800s`.
-
-##### User-defined variables
-
-[Variables can be defined](../../../operations/metrics/dashboards/yaml.md#templating-templating-properties) in a custom dashboard YAML file.
-
-##### Using variables
-
-Variables can be specified using double curly braces, such as `"{{ci_environment_slug}}"` ([added](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/20793) in GitLab 12.7).
-
-Support for the `"%{ci_environment_slug}"` format was
-[removed](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/31581) in GitLab 13.0.
-Queries that continue to use the old format will show no data.
-
-#### Query Variables from URL
-
-> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/214500) in GitLab 13.0.
-
-GitLab supports setting custom variables through URL parameters. Surround the variable
-name with double curly braces (`{{example}}`) to interpolate the variable in a query:
-
-```plaintext
-avg(sum(container_memory_usage_bytes{container_name!="{{pod}}"}) by (job)) without (job)  /1024/1024/1024'
-```
-
-The URL for this query would be:
-
-```plaintext
-http://gitlab.com/<user>/<project>/-/environments/<environment_id>/metrics?dashboard=.gitlab%2Fdashboards%2Fcustom.yml&pod=POD
-```
-
 #### Editing additional metrics from the dashboard
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/208976) in GitLab 12.9.
@@ -353,131 +299,6 @@ When **Metrics Dashboard YAML definition is invalid** at least one of the follow
 
 Metrics Dashboard YAML definition validation information is also available as a [GraphQL API field](../../../api/graphql/reference/index.md#metricsdashboard)
 
-### Templating variables for metrics dashboards
-
-> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/214539) in GitLab 13.0.
-
-Templating variables can be used to make your metrics dashboard more versatile.
-
-#### Templating variable types
-
-`templating` is a top-level key in the
-[dashboard YAML](../../../operations/metrics/dashboards/yaml.md#dashboard-top-level-properties).
-Define your variables in the `variables` key, under `templating`. The value of
-the `variables` key should be a hash, and each key under `variables`
-defines a templating variable on the dashboard, and may contain alphanumeric and underscore characters.
-
-A variable can be used in a Prometheus query in the same dashboard using the syntax
-described [here](#using-variables).
-
-##### `text` variable type
-
-CAUTION: **Warning:**
-This variable type is an _alpha_ feature, and is subject to change at any time
-without prior notice!
-
-For each `text` variable defined in the dashboard YAML, there will be a free text
-box on the dashboard UI, allowing you to enter a value for each variable.
-
-The `text` variable type supports a simple and a full syntax.
-
-###### Simple syntax
-
-This example creates a variable called `variable1`, with a default value
-of `default value`:
-
-```yaml
-templating:
-  variables:
-    variable1: 'default value'     # `text` type variable with `default value` as its default.
-```
-
-###### Full syntax
-
-This example creates a variable called `variable1`, with a default value of `default`.
-The label for the text box on the UI will be the value of the `label` key:
-
-```yaml
-templating:
-  variables:
-    variable1:                       # The variable name that can be used in queries.
-      label: 'Variable 1'            # (Optional) label that will appear in the UI for this text box.
-      type: text
-      options:
-        default_value: 'default'     # (Optional) default value.
-```
-
-##### `custom` variable type
-
-CAUTION: **Warning:**
-This variable type is an _alpha_ feature, and is subject to change at any time
-without prior notice!
-
-Each `custom` variable defined in the dashboard YAML creates a dropdown
-selector on the dashboard UI, allowing you to select a value for each variable.
-
-The `custom` variable type supports a simple and a full syntax.
-
-###### Simple syntax
-
-This example creates a variable called `variable1`, with a default value of `value1`.
-The dashboard UI will display a dropdown with `value1`, `value2` and `value3`
-as the choices.
-
-```yaml
-templating:
-  variables:
-    variable1: ['value1', 'value2', 'value3']
-```
-
-###### Full syntax
-
-This example creates a variable called `variable1`, with a default value of `value_option_2`.
-The label for the text box on the UI will be the value of the `label` key.
-The dashboard UI will display a dropdown with `Option 1` and `Option 2`
-as the choices.
-
-If you select `Option 1` from the dropdown, the variable will be replaced with `value option 1`.
-Similarly, if you select `Option 2`, the variable will be replaced with `value_option_2`:
-
-```yaml
-templating:
-  variables:
-    variable1:                           # The variable name that can be used in queries.
-      label: 'Variable 1'                # (Optional) label that will appear in the UI for this dropdown.
-      type: custom
-      options:
-        values:
-          - value: 'value option 1'        # The value that will replace the variable in queries.
-            text: 'Option 1'               # (Optional) Text that will appear in the UI dropdown.
-          - value: 'value_option_2'
-            text: 'Option 2'
-            default: true                  # (Optional) This option should be the default value of this variable.
-```
-
-##### `metric_label_values` variable type
-
-CAUTION: **Warning:**
-This variable type is an _alpha_ feature, and is subject to change at any time
-without prior notice!
-
-###### Full syntax
-
-This example creates a variable called `variable2`. The values of the dropdown will
-be all the different values of the `backend` label in the Prometheus series described by
-`up{env="production"}`.
-
-```yaml
-templating:
-  variables:
-    variable2:                           # The variable name that can be interpolated in queries.
-      label: 'Variable 2'                # (Optional) label that will appear in the UI for this dropdown.
-      type: metric_label_values
-      options:
-        series_selector: 'up{env="production"}'
-        label: 'backend'
-```
-
 ### Add related links to custom dashboards
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/216385) in GitLab 13.1.
diff --git a/lib/api/api.rb b/lib/api/api.rb
index 73e6bc4d767..bf685706bed 100644
--- a/lib/api/api.rb
+++ b/lib/api/api.rb
@@ -133,6 +133,8 @@ module API
       mount ::API::Boards
       mount ::API::Branches
       mount ::API::BroadcastMessages
+      mount ::API::Ci::Pipelines
+      mount ::API::Ci::PipelineSchedules
       mount ::API::Ci::Runner
       mount ::API::Ci::Runners
       mount ::API::Commits
@@ -179,8 +181,6 @@ module API
       mount ::API::NotificationSettings
       mount ::API::Pages
       mount ::API::PagesDomains
-      mount ::API::Pipelines
-      mount ::API::PipelineSchedules
       mount ::API::ProjectClusters
       mount ::API::ProjectContainerRepositories
       mount ::API::ProjectEvents
diff --git a/lib/api/ci/pipeline_schedules.rb b/lib/api/ci/pipeline_schedules.rb
new file mode 100644
index 00000000000..80ad8aa04dd
--- /dev/null
+++ b/lib/api/ci/pipeline_schedules.rb
@@ -0,0 +1,217 @@
+# frozen_string_literal: true
+
+module API
+  module Ci
+    class PipelineSchedules < Grape::API::Instance
+      include PaginationParams
+
+      before { authenticate! }
+
+      params do
+        requires :id, type: String, desc: 'The ID of a project'
+      end
+      resource :projects, requirements: ::API::API::NAMESPACE_OR_PROJECT_REQUIREMENTS do
+        desc 'Get all pipeline schedules' do
+          success Entities::PipelineSchedule
+        end
+        params do
+          use :pagination
+          optional :scope,    type: String, values: %w[active inactive],
+                              desc: 'The scope of pipeline schedules'
+        end
+        # rubocop: disable CodeReuse/ActiveRecord
+        get ':id/pipeline_schedules' do
+          authorize! :read_pipeline_schedule, user_project
+
+          schedules = ::Ci::PipelineSchedulesFinder.new(user_project).execute(scope: params[:scope])
+            .preload([:owner, :last_pipeline])
+          present paginate(schedules), with: Entities::PipelineSchedule
+        end
+        # rubocop: enable CodeReuse/ActiveRecord
+
+        desc 'Get a single pipeline schedule' do
+          success Entities::PipelineScheduleDetails
+        end
+        params do
+          requires :pipeline_schedule_id, type: Integer, desc: 'The pipeline schedule id'
+        end
+        get ':id/pipeline_schedules/:pipeline_schedule_id' do
+          present pipeline_schedule, with: Entities::PipelineScheduleDetails
+        end
+
+        desc 'Create a new pipeline schedule' do
+          success Entities::PipelineScheduleDetails
+        end
+        params do
+          requires :description, type: String, desc: 'The description of pipeline schedule'
+          requires :ref, type: String, desc: 'The branch/tag name will be triggered', allow_blank: false
+          requires :cron, type: String, desc: 'The cron'
+          optional :cron_timezone, type: String, default: 'UTC', desc: 'The timezone'
+          optional :active, type: Boolean, default: true, desc: 'The activation of pipeline schedule'
+        end
+        post ':id/pipeline_schedules' do
+          authorize! :create_pipeline_schedule, user_project
+
+          pipeline_schedule = ::Ci::CreatePipelineScheduleService
+            .new(user_project, current_user, declared_params(include_missing: false))
+            .execute
+
+          if pipeline_schedule.persisted?
+            present pipeline_schedule, with: Entities::PipelineScheduleDetails
+          else
+            render_validation_error!(pipeline_schedule)
+          end
+        end
+
+        desc 'Edit a pipeline schedule' do
+          success Entities::PipelineScheduleDetails
+        end
+        params do
+          requires :pipeline_schedule_id, type: Integer,  desc: 'The pipeline schedule id'
+          optional :description, type: String, desc: 'The description of pipeline schedule'
+          optional :ref, type: String, desc: 'The branch/tag name will be triggered'
+          optional :cron, type: String, desc: 'The cron'
+          optional :cron_timezone, type: String, desc: 'The timezone'
+          optional :active, type: Boolean, desc: 'The activation of pipeline schedule'
+        end
+        put ':id/pipeline_schedules/:pipeline_schedule_id' do
+          authorize! :update_pipeline_schedule, pipeline_schedule
+
+          if pipeline_schedule.update(declared_params(include_missing: false))
+            present pipeline_schedule, with: Entities::PipelineScheduleDetails
+          else
+            render_validation_error!(pipeline_schedule)
+          end
+        end
+
+        desc 'Take ownership of a pipeline schedule' do
+          success Entities::PipelineScheduleDetails
+        end
+        params do
+          requires :pipeline_schedule_id, type: Integer, desc: 'The pipeline schedule id'
+        end
+        post ':id/pipeline_schedules/:pipeline_schedule_id/take_ownership' do
+          authorize! :update_pipeline_schedule, pipeline_schedule
+
+          if pipeline_schedule.own!(current_user)
+            present pipeline_schedule, with: Entities::PipelineScheduleDetails
+          else
+            render_validation_error!(pipeline_schedule)
+          end
+        end
+
+        desc 'Delete a pipeline schedule' do
+          success Entities::PipelineScheduleDetails
+        end
+        params do
+          requires :pipeline_schedule_id, type: Integer, desc: 'The pipeline schedule id'
+        end
+        delete ':id/pipeline_schedules/:pipeline_schedule_id' do
+          authorize! :admin_pipeline_schedule, pipeline_schedule
+
+          destroy_conditionally!(pipeline_schedule)
+        end
+
+        desc 'Play a scheduled pipeline immediately' do
+          detail 'This feature was added in GitLab 12.8'
+        end
+        params do
+          requires :pipeline_schedule_id, type: Integer, desc: 'The pipeline schedule id'
+        end
+        post ':id/pipeline_schedules/:pipeline_schedule_id/play' do
+          authorize! :play_pipeline_schedule, pipeline_schedule
+
+          job_id = RunPipelineScheduleWorker # rubocop:disable CodeReuse/Worker
+            .perform_async(pipeline_schedule.id, current_user.id)
+
+          if job_id
+            created!
+          else
+            render_api_error!('Unable to schedule pipeline run immediately', 500)
+          end
+        end
+
+        desc 'Create a new pipeline schedule variable' do
+          success Entities::Variable
+        end
+        params do
+          requires :pipeline_schedule_id, type: Integer, desc: 'The pipeline schedule id'
+          requires :key, type: String, desc: 'The key of the variable'
+          requires :value, type: String, desc: 'The value of the variable'
+          optional :variable_type, type: String, values: ::Ci::PipelineScheduleVariable.variable_types.keys, desc: 'The type of variable, must be one of env_var or file. Defaults to env_var'
+        end
+        post ':id/pipeline_schedules/:pipeline_schedule_id/variables' do
+          authorize! :update_pipeline_schedule, pipeline_schedule
+
+          variable_params = declared_params(include_missing: false)
+          variable = pipeline_schedule.variables.create(variable_params)
+          if variable.persisted?
+            present variable, with: Entities::Variable
+          else
+            render_validation_error!(variable)
+          end
+        end
+
+        desc 'Edit a pipeline schedule variable' do
+          success Entities::Variable
+        end
+        params do
+          requires :pipeline_schedule_id, type: Integer, desc: 'The pipeline schedule id'
+          requires :key, type: String, desc: 'The key of the variable'
+          optional :value, type: String, desc: 'The value of the variable'
+          optional :variable_type, type: String, values: ::Ci::PipelineScheduleVariable.variable_types.keys, desc: 'The type of variable, must be one of env_var or file'
+        end
+        put ':id/pipeline_schedules/:pipeline_schedule_id/variables/:key' do
+          authorize! :update_pipeline_schedule, pipeline_schedule
+
+          if pipeline_schedule_variable.update(declared_params(include_missing: false))
+            present pipeline_schedule_variable, with: Entities::Variable
+          else
+            render_validation_error!(pipeline_schedule_variable)
+          end
+        end
+
+        desc 'Delete a pipeline schedule variable' do
+          success Entities::Variable
+        end
+        params do
+          requires :pipeline_schedule_id, type: Integer, desc: 'The pipeline schedule id'
+          requires :key, type: String, desc: 'The key of the variable'
+        end
+        delete ':id/pipeline_schedules/:pipeline_schedule_id/variables/:key' do
+          authorize! :admin_pipeline_schedule, pipeline_schedule
+
+          status :accepted
+          present pipeline_schedule_variable.destroy, with: Entities::Variable
+        end
+      end
+
+      helpers do
+        # rubocop: disable CodeReuse/ActiveRecord
+        def pipeline_schedule
+          @pipeline_schedule ||=
+            user_project
+              .pipeline_schedules
+              .preload(:owner, :last_pipeline)
+              .find_by(id: params.delete(:pipeline_schedule_id)).tap do |pipeline_schedule|
+                unless can?(current_user, :read_pipeline_schedule, pipeline_schedule)
+                  not_found!('Pipeline Schedule')
+                end
+              end
+        end
+        # rubocop: enable CodeReuse/ActiveRecord
+
+        # rubocop: disable CodeReuse/ActiveRecord
+        def pipeline_schedule_variable
+          @pipeline_schedule_variable ||=
+            pipeline_schedule.variables.find_by(key: params[:key]).tap do |pipeline_schedule_variable|
+              unless pipeline_schedule_variable
+                not_found!('Pipeline Schedule Variable')
+              end
+            end
+        end
+        # rubocop: enable CodeReuse/ActiveRecord
+      end
+    end
+  end
+end
diff --git a/lib/api/ci/pipelines.rb b/lib/api/ci/pipelines.rb
new file mode 100644
index 00000000000..33bb8b38d92
--- /dev/null
+++ b/lib/api/ci/pipelines.rb
@@ -0,0 +1,189 @@
+# frozen_string_literal: true
+
+module API
+  module Ci
+    class Pipelines < Grape::API::Instance
+      include PaginationParams
+
+      before { authenticate_non_get! }
+
+      params do
+        requires :id, type: String, desc: 'The project ID'
+      end
+      resource :projects, requirements: ::API::API::NAMESPACE_OR_PROJECT_REQUIREMENTS do
+        desc 'Get all Pipelines of the project' do
+          detail 'This feature was introduced in GitLab 8.11.'
+          success Entities::PipelineBasic
+        end
+        params do
+          use :pagination
+          optional :scope,    type: String, values: %w[running pending finished branches tags],
+                              desc: 'The scope of pipelines'
+          optional :status,   type: String, values: ::Ci::HasStatus::AVAILABLE_STATUSES,
+                              desc: 'The status of pipelines'
+          optional :ref,      type: String, desc: 'The ref of pipelines'
+          optional :sha,      type: String, desc: 'The sha of pipelines'
+          optional :yaml_errors, type: Boolean, desc: 'Returns pipelines with invalid configurations'
+          optional :name,     type: String, desc: 'The name of the user who triggered pipelines'
+          optional :username, type: String, desc: 'The username of the user who triggered pipelines'
+          optional :updated_before, type: DateTime, desc: 'Return pipelines updated before the specified datetime. Format: ISO 8601 YYYY-MM-DDTHH:MM:SSZ'
+          optional :updated_after, type: DateTime, desc: 'Return pipelines updated after the specified datetime. Format: ISO 8601 YYYY-MM-DDTHH:MM:SSZ'
+          optional :order_by, type: String, values: ::Ci::PipelinesFinder::ALLOWED_INDEXED_COLUMNS, default: 'id',
+                              desc: 'Order pipelines'
+          optional :sort,     type: String, values: %w[asc desc], default: 'desc',
+                              desc: 'Sort pipelines'
+        end
+        get ':id/pipelines' do
+          authorize! :read_pipeline, user_project
+          authorize! :read_build, user_project
+
+          pipelines = ::Ci::PipelinesFinder.new(user_project, current_user, params).execute
+          present paginate(pipelines), with: Entities::PipelineBasic
+        end
+
+        desc 'Create a new pipeline' do
+          detail 'This feature was introduced in GitLab 8.14'
+          success Entities::Pipeline
+        end
+        params do
+          requires :ref, type: String, desc: 'Reference'
+          optional :variables, Array, desc: 'Array of variables available in the pipeline'
+        end
+        post ':id/pipeline' do
+          Gitlab::QueryLimiting.whitelist('https://gitlab.com/gitlab-org/gitlab-foss/issues/42124')
+
+          authorize! :create_pipeline, user_project
+
+          pipeline_params = declared_params(include_missing: false)
+            .merge(variables_attributes: params[:variables])
+            .except(:variables)
+
+          new_pipeline = ::Ci::CreatePipelineService.new(user_project,
+                                                         current_user,
+                                                         pipeline_params)
+                             .execute(:api, ignore_skip_ci: true, save_on_errors: false)
+
+          if new_pipeline.persisted?
+            present new_pipeline, with: Entities::Pipeline
+          else
+            render_validation_error!(new_pipeline)
+          end
+        end
+
+        desc 'Gets a the latest pipeline for the project branch' do
+          detail 'This feature was introduced in GitLab 12.3'
+          success Entities::Pipeline
+        end
+        params do
+          optional :ref, type: String, desc: 'branch ref of pipeline'
+        end
+        get ':id/pipelines/latest' do
+          authorize! :read_pipeline, latest_pipeline
+
+          present latest_pipeline, with: Entities::Pipeline
+        end
+
+        desc 'Gets a specific pipeline for the project' do
+          detail 'This feature was introduced in GitLab 8.11'
+          success Entities::Pipeline
+        end
+        params do
+          requires :pipeline_id, type: Integer, desc: 'The pipeline ID'
+        end
+        get ':id/pipelines/:pipeline_id' do
+          authorize! :read_pipeline, pipeline
+
+          present pipeline, with: Entities::Pipeline
+        end
+
+        desc 'Gets the variables for a given pipeline' do
+          detail 'This feature was introduced in GitLab 11.11'
+          success Entities::Variable
+        end
+        params do
+          requires :pipeline_id, type: Integer, desc: 'The pipeline ID'
+        end
+        get ':id/pipelines/:pipeline_id/variables' do
+          authorize! :read_pipeline_variable, pipeline
+
+          present pipeline.variables, with: Entities::Variable
+        end
+
+        desc 'Gets the test report for a given pipeline' do
+          detail 'This feature was introduced in GitLab 13.0. Disabled by default behind feature flag `junit_pipeline_view`'
+          success TestReportEntity
+        end
+        params do
+          requires :pipeline_id, type: Integer, desc: 'The pipeline ID'
+        end
+        get ':id/pipelines/:pipeline_id/test_report' do
+          not_found! unless Feature.enabled?(:junit_pipeline_view, user_project)
+
+          authorize! :read_build, pipeline
+
+          present pipeline.test_reports, with: TestReportEntity, details: true
+        end
+
+        desc 'Deletes a pipeline' do
+          detail 'This feature was introduced in GitLab 11.6'
+          http_codes [[204, 'Pipeline was deleted'], [403, 'Forbidden']]
+        end
+        params do
+          requires :pipeline_id, type: Integer, desc: 'The pipeline ID'
+        end
+        delete ':id/pipelines/:pipeline_id' do
+          authorize! :destroy_pipeline, pipeline
+
+          destroy_conditionally!(pipeline) do
+            ::Ci::DestroyPipelineService.new(user_project, current_user).execute(pipeline)
+          end
+        end
+
+        desc 'Retry builds in the pipeline' do
+          detail 'This feature was introduced in GitLab 8.11.'
+          success Entities::Pipeline
+        end
+        params do
+          requires :pipeline_id, type: Integer, desc: 'The pipeline ID'
+        end
+        post ':id/pipelines/:pipeline_id/retry' do
+          authorize! :update_pipeline, pipeline
+
+          pipeline.retry_failed(current_user)
+
+          present pipeline, with: Entities::Pipeline
+        end
+
+        desc 'Cancel all builds in the pipeline' do
+          detail 'This feature was introduced in GitLab 8.11.'
+          success Entities::Pipeline
+        end
+        params do
+          requires :pipeline_id, type: Integer, desc: 'The pipeline ID'
+        end
+        post ':id/pipelines/:pipeline_id/cancel' do
+          authorize! :update_pipeline, pipeline
+
+          pipeline.cancel_running
+
+          status 200
+          present pipeline.reset, with: Entities::Pipeline
+        end
+      end
+
+      helpers do
+        def pipeline
+          strong_memoize(:pipeline) do
+            user_project.ci_pipelines.find(params[:pipeline_id])
+          end
+        end
+
+        def latest_pipeline
+          strong_memoize(:latest_pipeline) do
+            user_project.latest_pipeline_for_ref(params[:ref])
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/lib/api/pipeline_schedules.rb b/lib/api/pipeline_schedules.rb
deleted file mode 100644
index 9af16f61967..00000000000
--- a/lib/api/pipeline_schedules.rb
+++ /dev/null
@@ -1,215 +0,0 @@
-# frozen_string_literal: true
-
-module API
-  class PipelineSchedules < Grape::API::Instance
-    include PaginationParams
-
-    before { authenticate! }
-
-    params do
-      requires :id, type: String, desc: 'The ID of a project'
-    end
-    resource :projects, requirements: API::NAMESPACE_OR_PROJECT_REQUIREMENTS do
-      desc 'Get all pipeline schedules' do
-        success Entities::PipelineSchedule
-      end
-      params do
-        use :pagination
-        optional :scope,    type: String, values: %w[active inactive],
-                            desc: 'The scope of pipeline schedules'
-      end
-      # rubocop: disable CodeReuse/ActiveRecord
-      get ':id/pipeline_schedules' do
-        authorize! :read_pipeline_schedule, user_project
-
-        schedules = ::Ci::PipelineSchedulesFinder.new(user_project).execute(scope: params[:scope])
-          .preload([:owner, :last_pipeline])
-        present paginate(schedules), with: Entities::PipelineSchedule
-      end
-      # rubocop: enable CodeReuse/ActiveRecord
-
-      desc 'Get a single pipeline schedule' do
-        success Entities::PipelineScheduleDetails
-      end
-      params do
-        requires :pipeline_schedule_id, type: Integer, desc: 'The pipeline schedule id'
-      end
-      get ':id/pipeline_schedules/:pipeline_schedule_id' do
-        present pipeline_schedule, with: Entities::PipelineScheduleDetails
-      end
-
-      desc 'Create a new pipeline schedule' do
-        success Entities::PipelineScheduleDetails
-      end
-      params do
-        requires :description, type: String, desc: 'The description of pipeline schedule'
-        requires :ref, type: String, desc: 'The branch/tag name will be triggered', allow_blank: false
-        requires :cron, type: String, desc: 'The cron'
-        optional :cron_timezone, type: String, default: 'UTC', desc: 'The timezone'
-        optional :active, type: Boolean, default: true, desc: 'The activation of pipeline schedule'
-      end
-      post ':id/pipeline_schedules' do
-        authorize! :create_pipeline_schedule, user_project
-
-        pipeline_schedule = ::Ci::CreatePipelineScheduleService
-          .new(user_project, current_user, declared_params(include_missing: false))
-          .execute
-
-        if pipeline_schedule.persisted?
-          present pipeline_schedule, with: Entities::PipelineScheduleDetails
-        else
-          render_validation_error!(pipeline_schedule)
-        end
-      end
-
-      desc 'Edit a pipeline schedule' do
-        success Entities::PipelineScheduleDetails
-      end
-      params do
-        requires :pipeline_schedule_id, type: Integer,  desc: 'The pipeline schedule id'
-        optional :description, type: String, desc: 'The description of pipeline schedule'
-        optional :ref, type: String, desc: 'The branch/tag name will be triggered'
-        optional :cron, type: String, desc: 'The cron'
-        optional :cron_timezone, type: String, desc: 'The timezone'
-        optional :active, type: Boolean, desc: 'The activation of pipeline schedule'
-      end
-      put ':id/pipeline_schedules/:pipeline_schedule_id' do
-        authorize! :update_pipeline_schedule, pipeline_schedule
-
-        if pipeline_schedule.update(declared_params(include_missing: false))
-          present pipeline_schedule, with: Entities::PipelineScheduleDetails
-        else
-          render_validation_error!(pipeline_schedule)
-        end
-      end
-
-      desc 'Take ownership of a pipeline schedule' do
-        success Entities::PipelineScheduleDetails
-      end
-      params do
-        requires :pipeline_schedule_id, type: Integer, desc: 'The pipeline schedule id'
-      end
-      post ':id/pipeline_schedules/:pipeline_schedule_id/take_ownership' do
-        authorize! :update_pipeline_schedule, pipeline_schedule
-
-        if pipeline_schedule.own!(current_user)
-          present pipeline_schedule, with: Entities::PipelineScheduleDetails
-        else
-          render_validation_error!(pipeline_schedule)
-        end
-      end
-
-      desc 'Delete a pipeline schedule' do
-        success Entities::PipelineScheduleDetails
-      end
-      params do
-        requires :pipeline_schedule_id, type: Integer, desc: 'The pipeline schedule id'
-      end
-      delete ':id/pipeline_schedules/:pipeline_schedule_id' do
-        authorize! :admin_pipeline_schedule, pipeline_schedule
-
-        destroy_conditionally!(pipeline_schedule)
-      end
-
-      desc 'Play a scheduled pipeline immediately' do
-        detail 'This feature was added in GitLab 12.8'
-      end
-      params do
-        requires :pipeline_schedule_id, type: Integer, desc: 'The pipeline schedule id'
-      end
-      post ':id/pipeline_schedules/:pipeline_schedule_id/play' do
-        authorize! :play_pipeline_schedule, pipeline_schedule
-
-        job_id = RunPipelineScheduleWorker # rubocop:disable CodeReuse/Worker
-          .perform_async(pipeline_schedule.id, current_user.id)
-
-        if job_id
-          created!
-        else
-          render_api_error!('Unable to schedule pipeline run immediately', 500)
-        end
-      end
-
-      desc 'Create a new pipeline schedule variable' do
-        success Entities::Variable
-      end
-      params do
-        requires :pipeline_schedule_id, type: Integer, desc: 'The pipeline schedule id'
-        requires :key, type: String, desc: 'The key of the variable'
-        requires :value, type: String, desc: 'The value of the variable'
-        optional :variable_type, type: String, values: ::Ci::PipelineScheduleVariable.variable_types.keys, desc: 'The type of variable, must be one of env_var or file. Defaults to env_var'
-      end
-      post ':id/pipeline_schedules/:pipeline_schedule_id/variables' do
-        authorize! :update_pipeline_schedule, pipeline_schedule
-
-        variable_params = declared_params(include_missing: false)
-        variable = pipeline_schedule.variables.create(variable_params)
-        if variable.persisted?
-          present variable, with: Entities::Variable
-        else
-          render_validation_error!(variable)
-        end
-      end
-
-      desc 'Edit a pipeline schedule variable' do
-        success Entities::Variable
-      end
-      params do
-        requires :pipeline_schedule_id, type: Integer, desc: 'The pipeline schedule id'
-        requires :key, type: String, desc: 'The key of the variable'
-        optional :value, type: String, desc: 'The value of the variable'
-        optional :variable_type, type: String, values: ::Ci::PipelineScheduleVariable.variable_types.keys, desc: 'The type of variable, must be one of env_var or file'
-      end
-      put ':id/pipeline_schedules/:pipeline_schedule_id/variables/:key' do
-        authorize! :update_pipeline_schedule, pipeline_schedule
-
-        if pipeline_schedule_variable.update(declared_params(include_missing: false))
-          present pipeline_schedule_variable, with: Entities::Variable
-        else
-          render_validation_error!(pipeline_schedule_variable)
-        end
-      end
-
-      desc 'Delete a pipeline schedule variable' do
-        success Entities::Variable
-      end
-      params do
-        requires :pipeline_schedule_id, type: Integer, desc: 'The pipeline schedule id'
-        requires :key, type: String, desc: 'The key of the variable'
-      end
-      delete ':id/pipeline_schedules/:pipeline_schedule_id/variables/:key' do
-        authorize! :admin_pipeline_schedule, pipeline_schedule
-
-        status :accepted
-        present pipeline_schedule_variable.destroy, with: Entities::Variable
-      end
-    end
-
-    helpers do
-      # rubocop: disable CodeReuse/ActiveRecord
-      def pipeline_schedule
-        @pipeline_schedule ||=
-          user_project
-            .pipeline_schedules
-            .preload(:owner, :last_pipeline)
-            .find_by(id: params.delete(:pipeline_schedule_id)).tap do |pipeline_schedule|
-              unless can?(current_user, :read_pipeline_schedule, pipeline_schedule)
-                not_found!('Pipeline Schedule')
-              end
-            end
-      end
-      # rubocop: enable CodeReuse/ActiveRecord
-
-      # rubocop: disable CodeReuse/ActiveRecord
-      def pipeline_schedule_variable
-        @pipeline_schedule_variable ||=
-          pipeline_schedule.variables.find_by(key: params[:key]).tap do |pipeline_schedule_variable|
-            unless pipeline_schedule_variable
-              not_found!('Pipeline Schedule Variable')
-            end
-          end
-      end
-      # rubocop: enable CodeReuse/ActiveRecord
-    end
-  end
-end
diff --git a/lib/api/pipelines.rb b/lib/api/pipelines.rb
deleted file mode 100644
index 1aac7b7deb4..00000000000
--- a/lib/api/pipelines.rb
+++ /dev/null
@@ -1,187 +0,0 @@
-# frozen_string_literal: true
-
-module API
-  class Pipelines < Grape::API::Instance
-    include PaginationParams
-
-    before { authenticate_non_get! }
-
-    params do
-      requires :id, type: String, desc: 'The project ID'
-    end
-    resource :projects, requirements: API::NAMESPACE_OR_PROJECT_REQUIREMENTS do
-      desc 'Get all Pipelines of the project' do
-        detail 'This feature was introduced in GitLab 8.11.'
-        success Entities::PipelineBasic
-      end
-      params do
-        use :pagination
-        optional :scope,    type: String, values: %w[running pending finished branches tags],
-                            desc: 'The scope of pipelines'
-        optional :status,   type: String, values: ::Ci::HasStatus::AVAILABLE_STATUSES,
-                            desc: 'The status of pipelines'
-        optional :ref,      type: String, desc: 'The ref of pipelines'
-        optional :sha,      type: String, desc: 'The sha of pipelines'
-        optional :yaml_errors, type: Boolean, desc: 'Returns pipelines with invalid configurations'
-        optional :name,     type: String, desc: 'The name of the user who triggered pipelines'
-        optional :username, type: String, desc: 'The username of the user who triggered pipelines'
-        optional :updated_before, type: DateTime, desc: 'Return pipelines updated before the specified datetime. Format: ISO 8601 YYYY-MM-DDTHH:MM:SSZ'
-        optional :updated_after, type: DateTime, desc: 'Return pipelines updated after the specified datetime. Format: ISO 8601 YYYY-MM-DDTHH:MM:SSZ'
-        optional :order_by, type: String, values: ::Ci::PipelinesFinder::ALLOWED_INDEXED_COLUMNS, default: 'id',
-                            desc: 'Order pipelines'
-        optional :sort,     type: String, values: %w[asc desc], default: 'desc',
-                            desc: 'Sort pipelines'
-      end
-      get ':id/pipelines' do
-        authorize! :read_pipeline, user_project
-        authorize! :read_build, user_project
-
-        pipelines = ::Ci::PipelinesFinder.new(user_project, current_user, params).execute
-        present paginate(pipelines), with: Entities::PipelineBasic
-      end
-
-      desc 'Create a new pipeline' do
-        detail 'This feature was introduced in GitLab 8.14'
-        success Entities::Pipeline
-      end
-      params do
-        requires :ref, type: String, desc: 'Reference'
-        optional :variables, Array, desc: 'Array of variables available in the pipeline'
-      end
-      post ':id/pipeline' do
-        Gitlab::QueryLimiting.whitelist('https://gitlab.com/gitlab-org/gitlab-foss/issues/42124')
-
-        authorize! :create_pipeline, user_project
-
-        pipeline_params = declared_params(include_missing: false)
-          .merge(variables_attributes: params[:variables])
-          .except(:variables)
-
-        new_pipeline = ::Ci::CreatePipelineService.new(user_project,
-                                                       current_user,
-                                                       pipeline_params)
-                           .execute(:api, ignore_skip_ci: true, save_on_errors: false)
-
-        if new_pipeline.persisted?
-          present new_pipeline, with: Entities::Pipeline
-        else
-          render_validation_error!(new_pipeline)
-        end
-      end
-
-      desc 'Gets a the latest pipeline for the project branch' do
-        detail 'This feature was introduced in GitLab 12.3'
-        success Entities::Pipeline
-      end
-      params do
-        optional :ref, type: String, desc: 'branch ref of pipeline'
-      end
-      get ':id/pipelines/latest' do
-        authorize! :read_pipeline, latest_pipeline
-
-        present latest_pipeline, with: Entities::Pipeline
-      end
-
-      desc 'Gets a specific pipeline for the project' do
-        detail 'This feature was introduced in GitLab 8.11'
-        success Entities::Pipeline
-      end
-      params do
-        requires :pipeline_id, type: Integer, desc: 'The pipeline ID'
-      end
-      get ':id/pipelines/:pipeline_id' do
-        authorize! :read_pipeline, pipeline
-
-        present pipeline, with: Entities::Pipeline
-      end
-
-      desc 'Gets the variables for a given pipeline' do
-        detail 'This feature was introduced in GitLab 11.11'
-        success Entities::Variable
-      end
-      params do
-        requires :pipeline_id, type: Integer, desc: 'The pipeline ID'
-      end
-      get ':id/pipelines/:pipeline_id/variables' do
-        authorize! :read_pipeline_variable, pipeline
-
-        present pipeline.variables, with: Entities::Variable
-      end
-
-      desc 'Gets the test report for a given pipeline' do
-        detail 'This feature was introduced in GitLab 13.0. Disabled by default behind feature flag `junit_pipeline_view`'
-        success TestReportEntity
-      end
-      params do
-        requires :pipeline_id, type: Integer, desc: 'The pipeline ID'
-      end
-      get ':id/pipelines/:pipeline_id/test_report' do
-        not_found! unless Feature.enabled?(:junit_pipeline_view, user_project)
-
-        authorize! :read_build, pipeline
-
-        present pipeline.test_reports, with: TestReportEntity, details: true
-      end
-
-      desc 'Deletes a pipeline' do
-        detail 'This feature was introduced in GitLab 11.6'
-        http_codes [[204, 'Pipeline was deleted'], [403, 'Forbidden']]
-      end
-      params do
-        requires :pipeline_id, type: Integer, desc: 'The pipeline ID'
-      end
-      delete ':id/pipelines/:pipeline_id' do
-        authorize! :destroy_pipeline, pipeline
-
-        destroy_conditionally!(pipeline) do
-          ::Ci::DestroyPipelineService.new(user_project, current_user).execute(pipeline)
-        end
-      end
-
-      desc 'Retry builds in the pipeline' do
-        detail 'This feature was introduced in GitLab 8.11.'
-        success Entities::Pipeline
-      end
-      params do
-        requires :pipeline_id, type: Integer, desc: 'The pipeline ID'
-      end
-      post ':id/pipelines/:pipeline_id/retry' do
-        authorize! :update_pipeline, pipeline
-
-        pipeline.retry_failed(current_user)
-
-        present pipeline, with: Entities::Pipeline
-      end
-
-      desc 'Cancel all builds in the pipeline' do
-        detail 'This feature was introduced in GitLab 8.11.'
-        success Entities::Pipeline
-      end
-      params do
-        requires :pipeline_id, type: Integer, desc: 'The pipeline ID'
-      end
-      post ':id/pipelines/:pipeline_id/cancel' do
-        authorize! :update_pipeline, pipeline
-
-        pipeline.cancel_running
-
-        status 200
-        present pipeline.reset, with: Entities::Pipeline
-      end
-    end
-
-    helpers do
-      def pipeline
-        strong_memoize(:pipeline) do
-          user_project.ci_pipelines.find(params[:pipeline_id])
-        end
-      end
-
-      def latest_pipeline
-        strong_memoize(:latest_pipeline) do
-          user_project.latest_pipeline_for_ref(params[:ref])
-        end
-      end
-    end
-  end
-end
diff --git a/lib/gitlab/ci/pipeline/chain/validate/abilities.rb b/lib/gitlab/ci/pipeline/chain/validate/abilities.rb
index a30b6c6ef0e..769d0dffd0b 100644
--- a/lib/gitlab/ci/pipeline/chain/validate/abilities.rb
+++ b/lib/gitlab/ci/pipeline/chain/validate/abilities.rb
@@ -19,7 +19,7 @@ module Gitlab
               end
 
               unless allowed_to_write_ref?
-                return error("Insufficient permissions for protected ref '#{command.ref}'")
+                error("Insufficient permissions for protected ref '#{command.ref}'")
               end
             end
 
diff --git a/lib/gitlab/ci/pipeline/chain/validate/repository.rb b/lib/gitlab/ci/pipeline/chain/validate/repository.rb
index 8f5445850d7..7977ce90443 100644
--- a/lib/gitlab/ci/pipeline/chain/validate/repository.rb
+++ b/lib/gitlab/ci/pipeline/chain/validate/repository.rb
@@ -18,7 +18,7 @@ module Gitlab
               end
 
               if @command.ambiguous_ref?
-                return error('Ref is ambiguous')
+                error('Ref is ambiguous')
               end
             end
 
diff --git a/lib/gitlab/git_ref_validator.rb b/lib/gitlab/git_ref_validator.rb
index dfff6823689..1330b06bf9c 100644
--- a/lib/gitlab/git_ref_validator.rb
+++ b/lib/gitlab/git_ref_validator.rb
@@ -19,7 +19,7 @@ module Gitlab
       begin
         Rugged::Reference.valid_name?("refs/heads/#{ref_name}")
       rescue ArgumentError
-        return false
+        false
       end
     end
 
@@ -35,7 +35,7 @@ module Gitlab
       begin
         Rugged::Reference.valid_name?(expanded_name)
       rescue ArgumentError
-        return false
+        false
       end
     end
   end
diff --git a/lib/gitlab/gitaly_client/repository_service.rb b/lib/gitlab/gitaly_client/repository_service.rb
index 5b119fe616a..20ad6d0184b 100644
--- a/lib/gitlab/gitaly_client/repository_service.rb
+++ b/lib/gitlab/gitaly_client/repository_service.rb
@@ -201,9 +201,9 @@ module Gitlab
         response = GitalyClient.call(@storage, :repository_service, :fsck, request, timeout: GitalyClient.long_timeout)
 
         if response.error.empty?
-          return "", 0
+          ["", 0]
         else
-          return response.error.b, 1
+          [response.error.b, 1]
         end
       end
 
diff --git a/lib/gitlab/middleware/go.rb b/lib/gitlab/middleware/go.rb
index abdbccd3aa8..47d0b9ba8cb 100644
--- a/lib/gitlab/middleware/go.rb
+++ b/lib/gitlab/middleware/go.rb
@@ -101,7 +101,7 @@ module Gitlab
 
         if project
           # If a project is found and the user has access, we return the full project path
-          return project.full_path, project.default_branch
+          [project.full_path, project.default_branch]
         else
           # If not, we return the first two components as if it were a simple `namespace/project` path,
           # so that we don't reveal the existence of a nested project the user doesn't have access to.
@@ -112,7 +112,7 @@ module Gitlab
           # `go get gitlab.com/group/subgroup/project/subpackage` will not work for private projects.
           # `go get gitlab.com/group/subgroup/project.git/subpackage` will work, since Go is smart enough
           # to figure that out. `import 'gitlab.com/...'` behaves the same as `go get`.
-          return simple_project_path, 'master'
+          [simple_project_path, 'master']
         end
       end
 
diff --git a/lib/gitlab/utils.rb b/lib/gitlab/utils.rb
index e80cc51dc3b..5dfe8fc7ae3 100644
--- a/lib/gitlab/utils.rb
+++ b/lib/gitlab/utils.rb
@@ -56,7 +56,7 @@ module Gitlab
     #   * Maximum length is 63 bytes
     #   * First/Last Character is not a hyphen
     def slugify(str)
-      return str.downcase
+      str.downcase
         .gsub(/[^a-z0-9]/, '-')[0..62]
         .gsub(/(\A-+|-+\z)/, '')
     end
diff --git a/lib/google_api/auth.rb b/lib/google_api/auth.rb
index 319e5d2063c..7d9ff579c92 100644
--- a/lib/google_api/auth.rb
+++ b/lib/google_api/auth.rb
@@ -22,7 +22,7 @@ module GoogleApi
 
     def get_token(code)
       ret = client.auth_code.get_token(code, redirect_uri: redirect_uri)
-      return ret.token, ret.expires_at
+      [ret.token, ret.expires_at]
     end
 
     protected
diff --git a/spec/requests/api/pipeline_schedules_spec.rb b/spec/requests/api/ci/pipeline_schedules_spec.rb
similarity index 99%
rename from spec/requests/api/pipeline_schedules_spec.rb
rename to spec/requests/api/ci/pipeline_schedules_spec.rb
index 86f3ff54b83..e0199b7b51c 100644
--- a/spec/requests/api/pipeline_schedules_spec.rb
+++ b/spec/requests/api/ci/pipeline_schedules_spec.rb
@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe API::PipelineSchedules do
+RSpec.describe API::Ci::PipelineSchedules do
   let_it_be(:developer) { create(:user) }
   let_it_be(:user) { create(:user) }
   let_it_be(:project) { create(:project, :repository, public_builds: false) }
@@ -24,7 +24,7 @@ RSpec.describe API::PipelineSchedules do
           .each do |pipeline_schedule|
           create(:user).tap do |user|
             project.add_developer(user)
-            pipeline_schedule.update(owner: user)
+            pipeline_schedule.update!(owner: user)
           end
           pipeline_schedule.pipelines << build(:ci_pipeline, project: project)
         end
diff --git a/spec/requests/api/pipelines_spec.rb b/spec/requests/api/ci/pipelines_spec.rb
similarity index 99%
rename from spec/requests/api/pipelines_spec.rb
rename to spec/requests/api/ci/pipelines_spec.rb
index b9bc8eabf2c..c9ca806e2c4 100644
--- a/spec/requests/api/pipelines_spec.rb
+++ b/spec/requests/api/ci/pipelines_spec.rb
@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe API::Pipelines do
+RSpec.describe API::Ci::Pipelines do
   let_it_be(:user) { create(:user) }
   let_it_be(:non_member) { create(:user) }