* upstream/master: (638 commits)
  Simplify background migrations stealing code
  Expire cached user IDs that can see the performance after 5 minutes
  Promote visibility level helpers from Group to Namespace
  Fix off-by-one error in background migration retries
  Recover from all exceptions when stealing bg migration
  Fix label creation from new list for subgroup projects
  move click handler to button. when on the icon it wasn't triggered in firefox
  Fix incorrect AWS ELB metrics.
  Fix wrong link to docs in docs styleguide
  Update issue-related docs
  Refactor groups docs
  Add subgroups limitations to Pages docs
  Update Google launcher details
  Split docs on IP whitelist for monitoring access
  Update health check docs
  Bump fog-core to 1.44.3 and fog providers' plugins to latest
  Introduce have_gitlab_http_status
  Remove Repository#search_files
  Update Pipeline's badge count in Merge Request and Commits view to match real-time content
  Fixes the user order being overriden in the autocomplete controller
  ...