diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 405346d68da..314f99c5f41 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -80,6 +80,7 @@ variables:
   CACHE_CLASSES: "true"
   CHECK_PRECOMPILED_ASSETS: "true"
   FF_USE_FASTZIP: "true"
+  SKIP_FLAKY_TESTS_AUTOMATICALLY: "true"
 
   DOCS_REVIEW_APPS_DOMAIN: "178.62.207.141.nip.io"
   DOCS_GITLAB_REPO_SUFFIX: "ee"
diff --git a/app/controllers/profiles_controller.rb b/app/controllers/profiles_controller.rb
index e6b80f90dca..46738651960 100644
--- a/app/controllers/profiles_controller.rb
+++ b/app/controllers/profiles_controller.rb
@@ -6,6 +6,9 @@ class ProfilesController < Profiles::ApplicationController
 
   before_action :user
   before_action :authorize_change_username!, only: :update_username
+  before_action only: :update_username do
+    check_rate_limit!(:profile_update_username, scope: current_user) if Feature.enabled?(:rate_limit_profile_update_username, default_enabled: :yaml)
+  end
   skip_before_action :require_email, only: [:show, :update]
   before_action do
     push_frontend_feature_flag(:webauthn, default_enabled: :yaml)
diff --git a/config/feature_flags/development/rate_limit_profile_update_username.yml b/config/feature_flags/development/rate_limit_profile_update_username.yml
new file mode 100644
index 00000000000..e72e3d605e3
--- /dev/null
+++ b/config/feature_flags/development/rate_limit_profile_update_username.yml
@@ -0,0 +1,8 @@
+---
+name: rate_limit_profile_update_username
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/77221
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/349132
+milestone: '14.7'
+type: development
+group: group::optimize
+default_enabled: false
diff --git a/config/routes.rb b/config/routes.rb
index b02c1380c7e..a77edbe0b21 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -145,9 +145,6 @@ Rails.application.routes.draw do
 
     get 'acme-challenge/' => 'acme_challenges#show'
 
-    # UserCallouts
-    resources :user_callouts, controller: 'users/callouts', only: [:create] # remove after 14.6 2021-12-22 to handle mixed deployments
-
     scope :ide, as: :ide, format: false do
       get '/', to: 'ide#index'
       get '/project', to: 'ide#index'
diff --git a/doc/.vale/gitlab/ReadingLevel.yml b/doc/.vale/gitlab/ReadingLevel.yml
index 2e78c3ef36c..cd7597ee8dc 100644
--- a/doc/.vale/gitlab/ReadingLevel.yml
+++ b/doc/.vale/gitlab/ReadingLevel.yml
@@ -3,11 +3,11 @@
 #
 # Checks the Flesch-Kincaid reading level.
 #
-# For a list of all options, see https://errata-ai.gitbook.io/vale/getting-started/styles
-extends: readability
-message: "Grade level (%s) is high. To lower the score, use shorter sentences and words."
+# https://docs.errata.ai/vale/styles#metric
+extends: metric
+message: "The grade level - %s - refers to how hard the content is to understand. Aim for 8th grade or lower by using shorter sentences and words."
 link: https://docs.gitlab.com/ee/development/documentation/testing.html#vale-readability-score
 level: suggestion
-grade: 8
-metrics:
-  - Flesch-Kincaid
+formula: |
+  (0.39 * (words / sentences)) + (11.8 * (syllables / words)) - 15.59
+condition: "> 1"
diff --git a/doc/administration/merge_request_diffs.md b/doc/administration/merge_request_diffs.md
index f45df3e620b..01576eb4abf 100644
--- a/doc/administration/merge_request_diffs.md
+++ b/doc/administration/merge_request_diffs.md
@@ -14,7 +14,8 @@ By default, merge request diffs are stored in the database, in a table named
 `merge_request_diff_files`. Larger installations may find this table grows too
 large, in which case, switching to external storage is recommended.
 
-Merge request diffs can be stored on disk, or in object storage. In general, it
+Merge request diffs can be stored [on disk](#using-external-storage), or in
+[object storage](#using-object-storage). In general, it
 is better to store the diffs in the database than on disk. A compromise is available
 that only [stores outdated diffs](#alternative-in-database-storage) outside of database.
 
@@ -38,6 +39,7 @@ that only [stores outdated diffs](#alternative-in-database-storage) outside of d
    ```
 
 1. Save the file and [reconfigure GitLab](restart_gitlab.md#omnibus-gitlab-reconfigure) for the changes to take effect.
+   GitLab then migrates your existing merge request diffs to external storage.
 
 **In installations from source:**
 
@@ -61,6 +63,7 @@ that only [stores outdated diffs](#alternative-in-database-storage) outside of d
    ```
 
 1. Save the file and [restart GitLab](restart_gitlab.md#installations-from-source) for the changes to take effect.
+   GitLab then migrates your existing merge request diffs to external storage.
 
 ## Using object storage
 
@@ -81,6 +84,7 @@ be configured already.
 
 1. Set [object storage settings](#object-storage-settings).
 1. Save the file and [reconfigure GitLab](restart_gitlab.md#omnibus-gitlab-reconfigure) for the changes to take effect.
+   GitLab then migrates your existing merge request diffs to external storage.
 
 **In installations from source:**
 
@@ -94,6 +98,7 @@ be configured already.
 
 1. Set [object storage settings](#object-storage-settings).
 1. Save the file and [restart GitLab](restart_gitlab.md#installations-from-source) for the changes to take effect.
+   GitLab then migrates your existing merge request diffs to external storage.
 
 [Read more about using object storage with GitLab](object_storage.md).
 
diff --git a/doc/administration/object_storage.md b/doc/administration/object_storage.md
index e9e43cf2309..0976fc3684e 100644
--- a/doc/administration/object_storage.md
+++ b/doc/administration/object_storage.md
@@ -48,6 +48,9 @@ There are two ways of specifying object storage configuration in GitLab:
 For more information on the differences and to transition from one form to another, see
 [Transition to consolidated form](#transition-to-consolidated-form).
 
+If you are currently storing data locally, see
+[Migrate to object storage](#migrate-to-object-storage) for migration details.
+
 ### Consolidated object storage configuration
 
 > [Introduced](https://gitlab.com/gitlab-org/omnibus-gitlab/-/merge_requests/4368) in GitLab 13.2.
@@ -485,9 +488,9 @@ This is the list of valid `objects` that can be used:
 | `uploads`          | [User uploads](uploads.md)                                                 |
 | `lfs`              | [Git Large File Storage objects](lfs/index.md)                             |
 | `packages`         | [Project packages (for example, PyPI, Maven, or NuGet)](packages/index.md) |
-| `dependency_proxy` | [GitLab Dependency Proxy](packages/dependency_proxy.md)                    |
+| `dependency_proxy` | [Dependency Proxy](packages/dependency_proxy.md)                    |
 | `terraform_state`  | [Terraform state files](terraform_state.md)                                |
-| `pages`            | [GitLab Pages](pages/index.md)                                             |
+| `pages`            | [Pages](pages/index.md)                                             |
 
 Within each object type, three parameters can be defined:
 
@@ -514,6 +517,19 @@ no bucket is needed if CI artifacts are disabled with this setting:
 gitlab_rails['artifacts_enabled'] = false
 ```
 
+### Migrate to object storage
+
+To migrate existing local data to object storage see the following guides:
+
+- [Job artifacts](job_artifacts.md#migrating-to-object-storage) including archived job logs
+- [LFS objects](lfs/index.md#migrating-to-object-storage)
+- [Uploads](raketasks/uploads/migrate.md#migrate-to-object-storage)
+- [Merge request diffs](merge_request_diffs.md#using-object-storage)
+- [Packages](packages/index.md#migrating-local-packages-to-object-storage) (optional feature)
+- Dependency Proxy - [migration not yet supported](https://gitlab.com/gitlab-org/gitlab/-/issues/343064)
+- [Terraform state files](terraform_state.md#migrate-to-object-storage)
+- [Pages content](pages/index.md#migrate-pages-deployments-to-object-storage)
+
 ### Transition to consolidated form
 
 Prior to GitLab 13.2:
@@ -565,11 +581,11 @@ supported by consolidated configuration form, refer to the following guides:
 | [Merge request diffs](merge_request_diffs.md#using-object-storage) | **{check-circle}** Yes |
 | [Mattermost](https://docs.mattermost.com/administration/config-settings.html#file-storage)| **{dotted-circle}** No |
 | [Packages](packages/index.md#using-object-storage) (optional feature) | **{check-circle}** Yes |
-| [Dependency Proxy](packages/dependency_proxy.md#using-object-storage) (optional feature) **(PREMIUM SELF)** | **{check-circle}** Yes |
+| [Dependency Proxy](packages/dependency_proxy.md#using-object-storage) (optional feature) | **{check-circle}** Yes |
 | [Pseudonymizer](pseudonymizer.md) (optional feature) | **{dotted-circle}** No |
 | [Autoscale runner caching](https://docs.gitlab.com/runner/configuration/autoscale.html#distributed-runners-caching) (optional for improved performance) | **{dotted-circle}** No |
 | [Terraform state files](terraform_state.md#using-object-storage) | **{check-circle}** Yes |
-| [GitLab Pages content](pages/index.md#using-object-storage) | **{check-circle}** Yes |
+| [Pages content](pages/index.md#using-object-storage) | **{check-circle}** Yes |
 
 ### Other alternatives to file system storage
 
diff --git a/doc/api/packages.md b/doc/api/packages.md
index a75b2e376fa..9eb732cd5d6 100644
--- a/doc/api/packages.md
+++ b/doc/api/packages.md
@@ -26,7 +26,7 @@ GET /projects/:id/packages
 | `id`      | integer/string | yes | ID or [URL-encoded path of the project](index.md#namespaced-path-encoding) |
 | `order_by`| string | no | The field to use as order. One of `created_at` (default), `name`, `version`, or `type`. |
 | `sort`    | string | no | The direction of the order, either `asc` (default) for ascending order or `desc` for descending order. |
-| `package_type` | string | no | Filter the returned packages by type. One of `conan`, `maven`, `npm`, `pypi`, `composer`, `nuget`, `helm`, or `golang`. (_Introduced in GitLab 12.9_)
+| `package_type` | string | no | Filter the returned packages by type. One of `conan`, `maven`, `npm`, `pypi`, `composer`, `nuget`, `helm`, `terraform_module`, or `golang`. (_Introduced in GitLab 12.9_)
 | `package_name` | string | no | Filter the project packages with a fuzzy search by name. (_Introduced in GitLab 12.9_)
 | `include_versionless` | boolean | no | When set to true, versionless packages are included in the response. (_Introduced in GitLab 13.8_)
 | `status` | string | no | Filter the returned packages by status. One of `default` (default), `hidden`, or `processing`. (_Introduced in GitLab 13.9_)
diff --git a/doc/development/documentation/testing.md b/doc/development/documentation/testing.md
index 13648a7c710..134183a0e75 100644
--- a/doc/development/documentation/testing.md
+++ b/doc/development/documentation/testing.md
@@ -234,15 +234,8 @@ As a general guideline, the lower the score, the more readable the documentation
 For example, a page that scores `12` before a set of changes, and `9` after, indicates an iterative improvement to readability. The score is not an exact science, but is meant to help indicate the
 general complexity level of the page.
 
-The readability score is calculated by using the following formula:
-
-```plaintext
-(.39 x ASL) + (11.8 x ASW) – 15.59
-```
-
-- `ASL` is average sentence length (the number of words divided by the number of sentences).
-- `ASW` is the average number of syllables per word (the number of syllables divided by the number of words).
-- The score excludes headings, code blocks, and lists.
+The readability score is calculated based on the number of words per sentence, and the number
+of syllables per word. For more information, see [the Vale documentation](https://docs.errata.ai/vale/styles#metric).
 
 ### Install linters
 
diff --git a/doc/development/pipelines.md b/doc/development/pipelines.md
index cde44a8eb01..a9c68905095 100644
--- a/doc/development/pipelines.md
+++ b/doc/development/pipelines.md
@@ -170,10 +170,9 @@ After that, the next pipeline uses the up-to-date `knapsack/report-master.json`
 
 ### Flaky tests
 
-Tests that are [known to be flaky](testing_guide/flaky_tests.md#automatic-retries-and-flaky-tests-detection) are:
-
-- skipped if the `$SKIP_FLAKY_TESTS_AUTOMATICALLY` variable is set to `true` (`false` by default)
-- run if `$SKIP_FLAKY_TESTS_AUTOMATICALLY` variable is not set to `true` or if the `~"pipeline:run-flaky-tests"` label is set on the MR
+Tests that are [known to be flaky](testing_guide/flaky_tests.md#automatic-retries-and-flaky-tests-detection) are
+skipped unless the `$SKIP_FLAKY_TESTS_AUTOMATICALLY` variable is set to `false` or if the `~"pipeline:run-flaky-tests"`
+label is set on the MR.
 
 ### Monitoring
 
diff --git a/doc/install/next_steps.md b/doc/install/next_steps.md
index b5cfbfc9bbb..1db2bf9b7b6 100644
--- a/doc/install/next_steps.md
+++ b/doc/install/next_steps.md
@@ -20,9 +20,11 @@ installation.
   Runners, the agents that are responsible for all of the GitLab CI/CD features.
 - [GitLab Pages](../administration/pages/index.md): Configure GitLab Pages to
   allow hosting of static sites.
-- [GitLab Registry](../administration/packages/container_registry.md): With the
-  GitLab Container Registry, every project can have its own space to store Docker
+- [GitLab Registry](../administration/packages/container_registry.md): Set up the
+  GitLab Container Registry so every project can have its own space to store Docker
   images.
+- [GitLab Dependency Proxy](../administration/packages/dependency_proxy.md): Set up the dependency
+  proxy so you can cache container images from Docker Hub for faster, more reliable builds.
 
 ## Security
 
diff --git a/lib/gitlab/application_rate_limiter.rb b/lib/gitlab/application_rate_limiter.rb
index d02582d0362..a1310ef89e3 100644
--- a/lib/gitlab/application_rate_limiter.rb
+++ b/lib/gitlab/application_rate_limiter.rb
@@ -51,6 +51,7 @@ module Gitlab
           web_hook_calls:               { interval: 1.minute },
           users_get_by_id:              { threshold: 10, interval: 1.minute },
           profile_resend_email_confirmation:  { threshold: 5, interval: 1.minute },
+          profile_update_username:            { threshold: 10, interval: 1.minute },
           update_environment_canary_ingress:  { threshold: 1, interval: 1.minute },
           auto_rollback_deployment:           { threshold: 1, interval: 3.minutes },
           user_email_lookup:            { threshold: -> { application_settings.user_email_lookup_limit }, interval: 1.minute }
diff --git a/spec/controllers/profiles_controller_spec.rb b/spec/controllers/profiles_controller_spec.rb
index 9a1f8a8442d..6e7cc058fbc 100644
--- a/spec/controllers/profiles_controller_spec.rb
+++ b/spec/controllers/profiles_controller_spec.rb
@@ -153,9 +153,12 @@ RSpec.describe ProfilesController, :request_store do
     let(:gitlab_shell) { Gitlab::Shell.new }
     let(:new_username) { generate(:username) }
 
-    it 'allows username change' do
+    before do
       sign_in(user)
+      allow(::Gitlab::ApplicationRateLimiter).to receive(:throttled?).and_return(false)
+    end
 
+    it 'allows username change' do
       put :update_username,
         params: { user: { username: new_username } }
 
@@ -166,8 +169,6 @@ RSpec.describe ProfilesController, :request_store do
     end
 
     it 'updates a username using JSON request' do
-      sign_in(user)
-
       put :update_username,
           params: {
             user: { username: new_username }
@@ -179,8 +180,6 @@ RSpec.describe ProfilesController, :request_store do
     end
 
     it 'renders an error message when the username was not updated' do
-      sign_in(user)
-
       put :update_username,
           params: {
             user: { username: 'invalid username.git' }
@@ -192,8 +191,6 @@ RSpec.describe ProfilesController, :request_store do
     end
 
     it 'raises a correct error when the username is missing' do
-      sign_in(user)
-
       expect { put :update_username, params: { user: { gandalf: 'you shall not pass' } } }
         .to raise_error(ActionController::ParameterMissing)
     end
@@ -202,8 +199,6 @@ RSpec.describe ProfilesController, :request_store do
       it 'moves dependent projects to new namespace' do
         project = create(:project_empty_repo, :legacy_storage, namespace: namespace)
 
-        sign_in(user)
-
         put :update_username,
           params: { user: { username: new_username } }
 
@@ -220,8 +215,6 @@ RSpec.describe ProfilesController, :request_store do
 
         before_disk_path = project.disk_path
 
-        sign_in(user)
-
         put :update_username,
           params: { user: { username: new_username } }
 
@@ -232,5 +225,18 @@ RSpec.describe ProfilesController, :request_store do
         expect(before_disk_path).to eq(project.disk_path)
       end
     end
+
+    context 'when the rate limit is reached' do
+      it 'does not update the username and returns status 429 Too Many Requests' do
+        expect(::Gitlab::ApplicationRateLimiter).to receive(:throttled?).with(:profile_update_username, scope: user).and_return(true)
+
+        expect do
+          put :update_username,
+            params: { user: { username: new_username } }
+        end.not_to change { user.reload.username }
+
+        expect(response).to have_gitlab_http_status(:too_many_requests)
+      end
+    end
   end
 end
diff --git a/spec/support/flaky_tests.rb b/spec/support/flaky_tests.rb
index 0c211af695d..5ce55c47aab 100644
--- a/spec/support/flaky_tests.rb
+++ b/spec/support/flaky_tests.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 return unless ENV['CI']
-return unless ENV['SKIP_FLAKY_TESTS_AUTOMATICALLY'] == "true"
+return if ENV['SKIP_FLAKY_TESTS_AUTOMATICALLY'] == "false"
 return if ENV['CI_MERGE_REQUEST_LABELS'].to_s.include?('pipeline:run-flaky-tests')
 
 require_relative '../../tooling/rspec_flaky/report'