Add Documentation for Feature Flag Percent Rollout

Closes gitlab-ee#8240

See merge request gitlab-org/gitlab-ce!29770

Add updated screen shots

Add Jenkins quick reference page

See merge request gitlab-org/gitlab-ce!31518

Support dashboard params for metrics dashboard endpoint

See merge request gitlab-org/gitlab-ce!31063

https://gitlab.com/gitlab-org/gitlab-ce/issues/62971

Adds support to EnvironmentsController#metrics_dashboard
for the following params: group, title, y_label
These params are used to uniquely identify a panel on
the metrics dashboard.

Metrics are stored in several places, so this adds
utilities to find a specific panel from the database
or filesystem depending on the metric specified.

Also moves some shared utilities into separate classes,
notably default values and errors.

Docs: Update and sort reserved names

Closes #45619

See merge request gitlab-org/gitlab-ce!31569

Do not persist notes filter when auto-switching

See merge request gitlab-org/gitlab-ce!31229

Send a `persist_filter: false` param to backend when
opening links to notes and auto-switching to show
all notes

Removes duplicate button from job log page

Closes #65705

See merge request gitlab-org/gitlab-ce!31544

Lessen Gitaly N+1 errors in markdown processing

Closes #60449

See merge request gitlab-org/gitlab-ce!31037

Squash this commit and reword before merging..

Resolve "Selected project in the search view is not fully readable"

Closes #47814

See merge request gitlab-org/gitlab-ce!31137

Use Git 2.22 for GitLab

See merge request gitlab-org/gitlab-ce!31578

Part of: https://gitlab.com/gitlab-org/gitaly/issues/1715

Add migration for CE as well

Closes #13201

See merge request gitlab-org/gitlab-ce!31405

Remove iamphill from FE Maintainers in codeowners

See merge request gitlab-org/gitlab-ce!31484

Don't attempt to contact registry if it is disabled

See merge request gitlab-org/gitlab-ce!31553

Compress images with pngquant

See merge request gitlab-org/gitlab-ce!31566

- Re-organising search.scss
- Rely more on utility-classes instead of component classes
- Update relevant specs

- Changelog entry

Adding proper <label>s while removing labels from the fields themselves.
This gives more space for the field's content

Allow masking @ and : characters

Closes #63043

See merge request gitlab-org/gitlab-ce!31065

ActiveSession.cleaned_up_lookup_entries to use Redis#pipelined

See merge request gitlab-org/gitlab-ce!31096

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/65499

Closes #65499

See merge request gitlab-org/gitlab-ce!31458

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/62446

Closes #62446

See merge request gitlab-org/gitlab-ce!31448

Update DinD example for 19.03.1

See merge request gitlab-org/gitlab-ce!31051

Merge branch '33401-follow-up-from-add-prometheus-metrics-endpoint-and-basic-infrastructure-to-meter-code' into 'master'

Clean tmpdirs in metrics endpoint specs

Closes #33401

See merge request gitlab-org/gitlab-ce!31529

Fix assorted links in the docs

See merge request gitlab-org/gitlab-ce!31559

Fix links as discovered by the lint in the docs project

Add support for Content-Security-Policy

Closes #65330

See merge request gitlab-org/gitlab-ce!31402