* master: (445 commits)
  Document new variables
  Add memoization of commit related values in Ci::Pipeline
  Add CHANGELOG entry
  Add a CI_COMMIT_MESSAGE predefined variable
  Use btn-inverted for Enable group Runners
  Update doc wording to focus on NGINX server metrics
  Support anchors for Groups::RunnersController
  Add internalization
  Client implementation GetRawChanges
  Fix rubocop violation
  Cleanup pipeline build stage background migration
  Fix broken references in repository mirroring docs
  Use push events again to determine if repo needs checking
  Bump Gitaly Proto to v0.99
  Bump Gitaly to 0.98.0
  Add a comment about implementing proper policies for group runner permissions
  Adds changelog entry, changes RemoteMirror#sync? to be semantically sound and remove reference to pull mirrors in view
  Adds remote mirror table migration
  Backports every CE related change from ee-5484 to CE
  Fix rubocop
  ...