This commit adds a number of new metrics:

* ci_runners_active: The number of active runners
* ci_runners_instance_type_active: The number of active instance runners
* ci_runners_group_type_active: The number of active group runners
* ci_runners_project_type_active: The number of active project runners
* ci_runners_instance_type_active_online: The number of active and
  online instance runners
* ci_runners_group_type_active_online: The number of active and online
  group runners
* ci_runners_project_type_active_online: The number of active and online
  project runners

Relates to https://gitlab.com/gitlab-org/gitlab/-/issues/27141

Changelog: added

Integrate Spamcheck gRPC gem [RUN ALL RSPEC][RUN AS-IF-FOSS]

See merge request gitlab-org/gitlab!52385

JSON removal note for import export docs

See merge request gitlab-org/gitlab!60758

Fix spam check app setting

See merge request gitlab-org/gitlab!60755

Add package manager MVC checklist to developer docs

See merge request gitlab-org/gitlab!60008

Fix 404 on alert details

See merge request gitlab-org/gitlab!60411

Add link to test case attachment in test report

See merge request gitlab-org/gitlab!60528

docs: Remove API v4 migration guide from the current

See merge request gitlab-org/gitlab!60714

Accept null in the issueSetDueDate mutation

See merge request gitlab-org/gitlab!60139

Resolve Geo: Secondaries are orphaning artifact files

See merge request gitlab-org/gitlab!60644

Merge branch '322025-engineering-implement-tracking-for-continuous-onboarding-experiment' into 'master'

Measure continuous onboarding experiment

See merge request gitlab-org/gitlab!58689

Fix ArgumentError for bulk insert

See merge request gitlab-org/gitlab!60543

The logic now mirrors the logic for Akismet in #akismet_verdict.
Essentially, if Recaptcha is enabled and Spamcheck returns anything but
ALLOW, we return CONDITIONAL_ALLOW. If Recaptcha is disabled, we return
the result as-is.

Show Deploy Boards for Environments in Folders

See merge request gitlab-org/gitlab!60525

Set Sidekiq default retries back to 25 (only for new workers) [RUN AS-IF-FOSS]

See merge request gitlab-org/gitlab!59907

add spam_check_api_key textbox to admin / application_settings / reporting

See merge request gitlab-org/gitlab!60385

Merge branch '294210-gitlab-s-automatic-elasticsearch-reindexing-should-support-retries-for-manual-slicing' into 'master'

Advanced Search reindexing add support for retries

See merge request gitlab-org/gitlab!55681

Renaming "referrer" keys and values to "referer" because it's spelled
wrong.

Renamed `external_spam_check_result` and `#external_verdict` to
`spamcheck_result` and `#spamcheck_verdict` respectively.

Adding tests for protobuf object creation methods in
`Spamcheck::Client`.

Documentation: Update group export - NDJSON

See merge request gitlab-org/gitlab!60731

Small corrections to GraphQL style guide

See merge request gitlab-org/gitlab!60719

Add GitLab interpretations of DORA metrics

See merge request gitlab-org/gitlab!59808

Include verbiage around supply chain attacks

See merge request gitlab-org/gitlab!60652