* 9-0-stable:
  Merge branch 'protobuf-3.2.0.2' into 'master'
  Merge branch '28890-allow-creating-mr-without-target-branch-in-url' into 'master'
  Merge branch '24683-sidebar-spinners' into 'master'
  Merge branch '29534-todos-performance' into 'master'
  Merge branch '29586-pipelines-tabs' into 'master'
  Merge branch 'fix/regressions-in-ci-v4-api' into 'master'