Certify the 2K user reference architecture in the docs

Closes gitlab-org/quality/performance#58

See merge request gitlab-org/gitlab!21525

Remove after_initialize, before_validation for discussion_id on Note

See merge request gitlab-org/gitlab!22128

- We're already overridding the `discussion_id` method in Note.  The
  after_initialize callback is meant to ensure there's a discussion_id
  for all notes if there wasn't one created (or it got deleted?)

- after_initialize runs Ruby code for _every_ instantiation whether it
  needs to or not.  I've found this to cause performance problems.

Return 503 error when metrics dashboard has no connectivity

Closes #39162

See merge request gitlab-org/gitlab!22140

Adjust cache-repo CI stage run conditions

See merge request gitlab-org/gitlab!22193

Add trial_ends_on to Namespaces API

Closes #119158

See merge request gitlab-org/gitlab!22121

Add CI_JOB_NAME to rspec_profiling output filename

See merge request gitlab-org/gitlab!22195

Replace breakpoints with GlBreakpointInstance in feature_highlight_options.js

See merge request gitlab-org/gitlab!22010

Replace breakpoints with GlBreakpointInstance in sidebar_context.js

See merge request gitlab-org/gitlab!22012

Replace breakpoints with GlBreakpointInstance in frequent_items/utils.js

See merge request gitlab-org/gitlab!22019

Fixes Roadmap timeline bars not expanding on scroll

See merge request gitlab-org/gitlab!22207

Trim E2E fixture Dependency Scanning report

See merge request gitlab-org/gitlab!22173

Replace breakpoints with GlBreakpointInstance in lib/utils/common_utils.js

See merge request gitlab-org/gitlab!22028

Replace breakpoints with GlBreakpointInstance in pages/projects/wikis/wikis.js

See merge request gitlab-org/gitlab!22017

Replace breakpoints with GlBreakpointInstance in epic_bundle.js

See merge request gitlab-org/gitlab!22016

Replace breakpoints with GlBreakpointInstance in commit/pipelines/pipelines_table.vue

See merge request gitlab-org/gitlab!22013

Replace breakpoints with GlBreakpointInstance in boards/components/modal/list.vue

See merge request gitlab-org/gitlab!22011

Avoid Gitaly RPCs in rate-limited raw blob requests

Closes gitlab-com/gl-infra/scalability#77

See merge request gitlab-org/gitlab!22123

Merge branch '27946-merge-request-discussions-api-doesn-t-reject-an-error-input-in-some-case' into 'master'

Resolve "Merge request discussions API doesn't reject an error input in some case"

Closes #27946

See merge request gitlab-org/gitlab!21936

This provides test cases which prove that changes in
https://gitlab.com/gitlab-org/gitlab/merge_requests/21034
actually resolve https://gitlab.com/gitlab-org/gitlab/issues/27946.

Also speeds up the diff_note_spec by roughly 15 seconds.

Replace breakpoints with GlBreakpointInstance in fly_out_nav.js

See merge request gitlab-org/gitlab!22005

13495-b: Add graphql additions needed by #13495

See merge request gitlab-org/gitlab!21264

Adjust doc codeowners entry

See merge request gitlab-org/gitlab!22201

Extended GraphQL local state description in FE dev guide

See merge request gitlab-org/gitlab!22102

Add ability to run reactive caching synchronously

See merge request gitlab-org/gitlab!20655

Remove IIFEs from project_find_file.js

Closes #34623

See merge request gitlab-org/gitlab!21855

Remove the `:release_search_filter` feature flag

Closes #36528

See merge request gitlab-org/gitlab!21767