Add a bunch of missing properties to the settings API documentation

See merge request !2753

re-add missing css class in admin sidebar template

See merge request !2759

Docs: update links guideline to inline links

See merge request !2716

Update project_services.md

Closes #3253

See merge request !2767

EE-Port: Handle creating a nested group on MySQL correctly

See merge request !2766

Add a health check for the state of Geo replication lag in secondary

Closes #1929

See merge request !1610

Note about duplicating repository config on secondary.

See merge request !2764

Use proper logging for artifacts rake task

See merge request !2762

Fix approvals before merge error while importing projects

Closes #2617

See merge request !2763

Since we don't support nested groups on MySQL, raise an error
explaining that on import instead of trying anyway.

Using logging we get a known structure, and the time of the message.
Last change removed the unused `order` statement. This is not used
because `find_each` uses the primary key anyway.

Add event metrics to mirrors and remote mirrors.

See merge request !2744

Log Geo update delay and download times of repository sync

Closes #3020

See merge request !2721

EE - Convert Protected Branches feature JS code to ES6

See merge request !2481

CE upstream: Thursday

Closes gitaly#488 and gitlab-ce#36622

See merge request !2752

Reconfigure required for `db_key_base` update

See merge request !2754

Port of font-weight-adjusted to EE !12896

See merge request !2749

Including EE specific ones

Support Elasticsearch v5.1 - v5.5

See merge request !2751

Display 'Check namespace plan' checkbox in admin area on GitLab.com, staging, or in development

See merge request !2750

Fix old MR diffs

Closes #36516

See merge request !13744

Add an option to list only archived projects

Closes #35994

See merge request !13492