Add docs for incremental rollouts

Closes gitlab-ee#5925

See merge request gitlab-org/gitlab-ce!18978

Calculating repository checksums executed by Gitaly

Closes gitaly#1105 and #46293

See merge request gitlab-org/gitlab-ce!18907

Memoize Gitlab::Database.version

See merge request gitlab-org/gitlab-ce!19021

OPT_OUT status has been removed, and alternative implementation removed.
Also checks if the repository exists before executing the checksum RPC
to guard against NotFound errors.

Closes gitlab-org/gitaly#1105

Move group lists css from framework/lists.scss to pages/groups.scss

See merge request gitlab-org/gitlab-ce!19027

Fixed inconsistent spacing in web IDE  sidebar

Closes #46162

See merge request gitlab-org/gitlab-ce!18827

Make stores export a createStore() which can be used in tests

See merge request gitlab-org/gitlab-ce!19030

Add support for variables expression regexp syntax

Closes #43601

See merge request gitlab-org/gitlab-ce!18902

Do not allow to trigger manual actions that were skipped

Closes #42589

See merge request gitlab-org/gitlab-ce!18985

Add anchor for incoming email regex, closes 44989

See merge request gitlab-org/gitlab-ce!18917

Add doc about backup-restore in docker and k8s

Closes gitlab-org/distribution/team-tasks#87

See merge request gitlab-org/gitlab-ce!18702

Resolve "Expand API: Render an arbitrary Markdown document"

Closes #19861

See merge request gitlab-org/gitlab-ce!18926

Bring CE-EE parity to app/services/milestones/base_service.rb

See merge request gitlab-org/gitlab-ce!19018

Bring CE-EE parity to app/services/lfs/unlock_file_service.rb

See merge request gitlab-org/gitlab-ce!19017

Update EE > CE downgrade service removal steps

Closes #46441

See merge request gitlab-org/gitlab-ce!19034

Loosen the matcher in the MR creation test

Closes gitlab-qa#245

See merge request gitlab-org/gitlab-ce!19012

Fix api_json.log not always reporting the right HTTP status code

See merge request gitlab-org/gitlab-ce!19028

As described in https://github.com/aserafin/grape_logging/issues/45, if
a Grape error is caught by the handlers and a different return code
is returned, then the api_json.log would have a 500 error code
instead of the right value. Inserting the GrapeLogging middleware
after the Grape middleware fixes this problem.

Seen in https://gitlab.com/gitlab-com/infrastructure/issues/4249

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Resolve "Web IDE: Previewing Markdown in Firefox doesn’t show a scroll bar"

Closes #45934

See merge request gitlab-org/gitlab-ce!18992

Add Keyboard shortcuts for "Kubernetes" and "Environments"

Closes #46427

See merge request gitlab-org/gitlab-ce!19002

Move API group deletion to Sidekiq

See merge request gitlab-org/gitlab-ce!18626

add specific details related to how the UX team uses labels to tackle issues

See merge request gitlab-org/gitlab-ce!18927

fix / assigne username wrapping problem has been fixed

See merge request gitlab-org/gitlab-ce!18986

This removes the need for running a database query every time we want to
check the database version.

NestingDepth (level 5) in pages/pipelines.scss

See merge request gitlab-org/gitlab-ce!18830

Fix group lists visual

See merge request gitlab-org/gitlab-ce!19010

Conditionally enable deprecation log messages

Closes #46158 and gitlab-com/infrastructure#4228

See merge request gitlab-org/gitlab-ce!18997