Merge branch '42861-move-include-external-files-in-gitlab-ci-yml-from-starter-to-libre' into 'master'

Resolve "Move "include external files in .gitlab-ci.yml" from Starter to Libre"

Closes #42861

See merge request gitlab-org/gitlab-ce!21603

Strip whitespace from Sentry URL

Closes #49621

See merge request gitlab-org/gitlab-ce!21703

[ci skip]

Resolve "500 Internal Server Error: Deleting branch of deleted project"

Closes #50678

See merge request gitlab-org/gitlab-ce!21542

Adding extra whitespace in the DSN could prevent the server from
starting due to InvalidURIErrors in sentry-raven.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/49621

Remove Rugged and shell code from Gitlab::Git

Closes gitaly#1124

See merge request gitlab-org/gitlab-ce!21488

Fix mention in edit mr

Closes #50608

See merge request gitlab-org/gitlab-ce!21696

Log project services sidekiq failures

Closes #50528

See merge request gitlab-org/gitlab-ce!21336

Use GitLab UI pagination component for groups

See merge request gitlab-org/gitlab-ce!21287

Update gitlab shell

See merge request gitlab-org/gitlab-ce!21701

Update code_review.md to include a recommendation for assigning maintainers from different teams

See merge request gitlab-org/gitlab-ce!21644

Initialize projects with readme

See merge request gitlab-org/gitlab-ce!21617

Resolve "Markdown footnotes don't render when inside a table..."

Closes #51200

See merge request gitlab-org/gitlab-ce!21675

Improve recommended maintainer docs

Update example Prometheus queries

Closes #49849

See merge request gitlab-org/gitlab-ce!21695

Add trigger information for job API

Closes #50989

See merge request gitlab-org/gitlab-ce!21495

Create new entity called TriggerVariablesEnitity for trigger variables,
to aid reuseablity in the future.

Update JSON schema to include trigger information in the response.

Refactor rspec tests a bit to reduce duplication and for the `context`
to make sense.

closes https://gitlab.com/gitlab-org/gitlab-ce/issues/50989

* Update metric names to match current release.
* Improve descriptions.
* Improve examples to show more query language functionality.

Memory:
* Show use of `or` function.
* Automatically select "MemAvailable" kernel metric if possible.

CPU:
* Show use of `avg without ...`.
* Show CPU utilization per node.

Network:
* Show use of `!=` label matching.
* Don't show "localhost" metrics.

Add GitLab project id to jupyter config installed via cluster apps

See merge request gitlab-org/gitlab-ce!21341

Merge branch '51271-error-500-due-to-encoding-issues-when-when-attempting-to-access-issues-api' into 'master'

Resolve "Error 500 due to encoding issues when when attempting to access issues API"

Closes #51271

See merge request gitlab-org/gitlab-ce!21680

- utilize the 'out' method to output the 'fence_info',
  which converts to utf8
- output 'sourcepos' again

Filter any parameters ending with "key" in logs

See merge request gitlab-org/gitlab-ce!21688

Use gitlab-ui loading icon

See merge request gitlab-org/gitlab-ce!21659

Rails does a partial match for strings in the filter_parameters
configuration, so the parameter "key" causes "key_id" to be filtered
even though it's a useful parameter for debugging internal API issues.

We now revise this filter to make any parameter ending with "key" is
filtered.

Relates to https://gitlab.com/gitlab-com/gl-infra/production/issues/463

Resolve "500 Internal Server Error: Cherrypick commit with empty branch name"

Closes #50677

See merge request gitlab-org/gitlab-ce!21501

Generate JUnit report for Karma tests

See merge request gitlab-org/gitlab-ce!21473

Explicitly use bootstrap 4.1.1

Closes #51362

See merge request gitlab-org/gitlab-ce!21683