Moved to OPT_OUT in 7d14b725, Now, by
removing the feature gates, this is an mandatory feature.

Related issues:
- https://gitlab.com/gitlab-org/gitaly/issues/526
- https://gitlab.com/gitlab-org/gitaly/issues/1194

Closes https://gitlab.com/gitlab-org/gitaly/issues/749
Closes https://gitlab.com/gitlab-org/gitaly/issues/1212
Closes https://gitlab.com/gitlab-org/gitaly/issues/1195

Add bar chart component

See merge request gitlab-org/gitlab-ce!20082

Resolve "API endpoint that returns all members, including the inherited membership through ancestor group"

Closes #32783

See merge request gitlab-org/gitlab-ce!19748

Resolve "API endpoint that returns all members, including the inherited membership through ancestor group"

Resolve "Toggle comments button icon is misaligned"

Closes #49192

See merge request gitlab-org/gitlab-ce!20756

Replace issues time tracking progress bar with gitlab-ui's progress bar

Closes gitlab-ui#11

See merge request gitlab-org/gitlab-ce!20416

Resolve "Broadcast message is misaligned on sign in page"

Closes #49364

See merge request gitlab-org/gitlab-ce!20794

[CE Backport] Geo: Cache projects_count and wikis_count in SiteStatistic

See merge request gitlab-org/gitlab-ce!20413

fixes #47716 where email confirmation fails after adding additional emails

Closes #47716

See merge request gitlab-org/gitlab-ce!20084

Add rbtrace to Gemfile

See merge request gitlab-org/gitlab-ce!20831

Enable rubocop for db/**/* and ee/db/**/*

Closes #49582

See merge request gitlab-org/gitlab-ce!20834

Back port ReactiveCaching

See merge request gitlab-org/gitlab-ce!20836

doc: Configuring and initializing Helm Tiller

Closes #49025

See merge request gitlab-org/gitlab-ce!20515

This will be enabled if ENABLE_RBTRACE environment variable is defined.
This will allow us to debug all sorts of issues in production:

https://github.com/tmm1/rbtrace

Prefer using direct links in docs styleguide

See merge request gitlab-org/gitlab-ce!20832

Adds rack attack disabled by default notice to documentation

See merge request gitlab-org/gitlab-ce!20833

Disable Rack Attack by default

Closes #40973

See merge request gitlab-org/gitlab-ce!16669

Enable frozen string in presenters and policies

See merge request gitlab-org/gitlab-ce!20819

i18n: externalize strings from 'app/views/layouts'

See merge request gitlab-org/gitlab-ce!19766

Bump html-pipeline to 2.8.4

See merge request gitlab-org/gitlab-ce!20828

Replace snake case in SCSS variables

See merge request gitlab-org/gitlab-ce!20799

Use limit parameter to retrieve Wikis from Gitaly

See merge request gitlab-org/gitlab-ce!20764

Fix missing ` in users.md

See merge request gitlab-org/gitlab-ce!20817

Replace author_link snake case in stylesheets, specs, and helpers

Closes #30921

See merge request gitlab-org/gitlab-ce!20797

Add frozen_string_literal to migration templates

See merge request gitlab-org/gitlab-ce!20829

Update doc/ci/docker/using_docker_build.md

Closes #48691

See merge request gitlab-org/gitlab-ce!20426

Part of #47424

In 2.8.3, it was possible to modify a constant without knowing it, which
led to a major performance regression (https://gitlab.com/gitlab-org/gitlab-ce/issues/49409).
Now attempting to modify the HTML::Pipeline::SanitizationFilter.WHITELIST will result in
"can't modify frozen Hash".

See https://github.com/jch/html-pipeline/pull/299.