Add developer documentation for distributing tracing

See merge request gitlab-org/gitlab-ce!25150

This change adds developer documentation on using distributed tracing
using Jaeger.

Adhere to stylelint specs

See merge request gitlab-org/gitlab-ce!25620

More Stylelint rules

See merge request gitlab-org/gitlab-ce!25266

Feature: Runner tag filter for admin view

See merge request gitlab-org/gitlab-ce!19740

Due to performance reasons we cannot use the type filter on the tags.
The table for ActsAsTaggableOn is too big and too unoptimized, such that
the queries time out on production.

See the discussion
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/19740#note_120087938
for more info.

The query generated by ActsAsTaggableOn `@taggable_type.all_tags` is
very inefficient (joins too much, grouping, inner select, ...).

the potential number of available runner tags is too large to load it
statically to a dropdown. we use the same lazy loaded dropdown as is
used for the users dropdown already.

Danger ignores gitlab.pot

See merge request gitlab-org/gitlab-ce!25594

CE backport of members-ee-code

See merge request gitlab-org/gitlab-ce!25593

Fix misspellings in app/spec executable lines

See merge request gitlab-org/gitlab-ce!25521

Fixed placeholder text in feature proposal issue template

See merge request gitlab-org/gitlab-ce!25603

Merge branch '10014-ee-spec-models-ci-build_spec-rb-ee-spec-requests-api-runner_spec-rb-and-ee-spec-services-ci-process_pipeline_service_spec-rb-are-all-failing-ce' into 'master'

Revert "Merge branch 'revert-8baf9e5f' into 'master'"

See merge request gitlab-org/gitlab-ce!25584

Enforce using the latest diff version when creating suggestions

Closes gitlab-ee#9876

See merge request gitlab-org/gitlab-ce!25441

Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

Resolve "Project fetch statistics API (HTTP only)"

Closes #42086

See merge request gitlab-org/gitlab-ce!23596

Allow `:read_list` when `:read_group` is allowed

Closes #58149

See merge request gitlab-org/gitlab-ce!25524

This reverts commit f5201a81, reversing
changes made to 48e6db0d.

Fix `import_github_repo_spec.rb`

Closes #55700

See merge request gitlab-org/gitlab-ce!25133

Add Project template for go-micro

Closes #58082

See merge request gitlab-org/gitlab-ce!25553

API support for MR merge to temporary merge ref path

Closes #57252

See merge request gitlab-org/gitlab-ce!24918

Prepare test suite for switch to Gitaly-embedded Git hooks

See merge request gitlab-org/gitlab-ce!25423

The API get projects/:id/traffic/fetches allows user with write
access to the repository to get the number of clones for the
last 30 days.

fix: validate 'include' keywords in gitlab-ci.yml configuration files

Closes #55863

See merge request gitlab-org/gitlab-ce!24098

Resolve "N+1 queries for `user_notes_count` in Issues / MergeRequests API"

See merge request gitlab-org/gitlab-ce!25592

Move logic of obtaining Issuable data to separate method

Fix inconsistent pagination styles

Closes #58194

See merge request gitlab-org/gitlab-ce!25552