Added info about Admin user ability to push to protected branches.

See merge request !1009

Test both PostgreSQL and MySQL for the win

See merge request !1646

Make handler metric params more explicit

See merge request !1696

Refactor add_users method for project and group [EE]

See merge request !1697

This lets us track how many incoming emails a GitLab instance is processing, by
email type (handler) and by project (where applicable).

Remove duplicated tests

See merge request !1687

[ci skip]

[ci skip]

Docs for canary deployments vol 2

Closes gitlab-ce#31270

See merge request !1704

[ci skip]

Replace service_desk_enabled.png

See merge request !1701

Docs for resolvable discussions

See merge request !1700

Check if incoming emails and email key are available for service desk

Closes #2160

See merge request !1690

- Move to dicsussions/index.md
- Bring back previous path with a link to new location
- Reorder sections

Remove period from burndown charts warning help link

See merge request !1698

Port of environments-vue-3 to EE

See merge request !1693

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

Simplify service desk project email

Closes #2029

See merge request !1668

Add warning when burndown data is not accurate + docs

Closes #2151

See merge request !1650

Fix specs and email address regex

Port of 31189-pipelines-error-state to EE

See merge request !1692

Add index to approvals.merge_request_id

Closes #2229

See merge request !1695

Show canaries first

Closes #2216

See merge request !1685