Add docs for setting up external Prometheus

Closes #40949 and #37255

See merge request gitlab-org/gitlab-ce!22831

Fix a race condition in the shard population logic

Closes #53972

See merge request gitlab-org/gitlab-ce!23028

Upgrade to Ruby 2.5.3

Closes #41825

See merge request gitlab-org/gitlab-ce!22555

Fixed image commenting on moved files

See merge request gitlab-org/gitlab-ce!23023

Fix broken UI on commit discussions

Closes #53780

See merge request gitlab-org/gitlab-ce!22952

Merge branch '53812-review-apps-check-whether-release-exists-before-attempting-stop_review' into 'master'

Ensure we abort the cleanup if release is empty

Closes #53812

See merge request gitlab-org/gitlab-ce!22992

Border radius fixes for redesigned discussions

Closes #53880 and #53767

See merge request gitlab-org/gitlab-ce!23006

Updates ci header component with gitlab-ui

See merge request gitlab-org/gitlab-ce!23000

Signed-off-by: Rémy Coutable <remy@rymai.me>

Update URL for the grafana instance of sitespeed

See merge request gitlab-org/gitlab-ce!23001

Update docs to put prepend as the last line

Closes #53919

See merge request gitlab-org/gitlab-ce!23017

Add documentation about frontend test categories to frontend guide

See merge request gitlab-org/gitlab-ce!21344

Document new report types

See merge request gitlab-org/gitlab-ce!22828

Update merge request page object and selectors

See merge request gitlab-org/gitlab-ce!22939

Update eks guide to include admin token creation.

See merge request gitlab-org/gitlab-ce!22926

Refactor reference regexes and identity scopes

See merge request gitlab-org/gitlab-ce!22987

It reuses loading button instead of creating a new loading button
It uses the new gitlab-ui components

Attempt to update google-protobuf for migration-paths

Because the one we were using aren't compatible with
Ruby 2.5.3, and it'll be troublesome to switch Ruby.
Upgrading google-protobuf will be much easier.

All of them will need to be updated for Ruby 2.5.3

We remove oj because we don't really need it and it
doesn't compile on 2.5.3 with that version.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/41825

Resolve Markdown ordered lists not conforming to styleguide

See merge request gitlab-org/gitlab-ce!23007

Add documentation for archive builds

Closes #53534

See merge request gitlab-org/gitlab-ce!22909

Show HTTP response code for Kubernetes errors

Closes #53628

See merge request gitlab-org/gitlab-ce!22964

This updates the documentation for adding EE specific features to
clarify that `prepend` should be on the last line, and how to deal with
code that depends on class methods redefined in EE.

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/53919

Upgrade to node v10.x and yarn 1.12.x

See merge request gitlab-org/gitlab-ce!22979

remove .mr-version-controls from .fixed-with-container

See merge request gitlab-org/gitlab-ce!23003

Defines Vue.js Expert Role

See merge request gitlab-org/gitlab-ce!21922

update the part to Google+ API

See merge request gitlab-org/gitlab-ce!23014

Fix deployment jobs using nil token

Closes #53879

See merge request gitlab-org/gitlab-ce!23009