* master: (30 commits)
  Docs: Pages - clean up articles
  Only use features for events
  Put all event metrics exposed to prometheus behind a feature flag
  Add version which LFS lock was introduced
  Remove unecessary validate: true from belongs_to :project
  fix broken specs
  remove common_d3 bundle
  remove graphs_show webpack bundle
  Chart.html.haml refactor
  Remove extraneous tests from Issues API spec
  [GH Import] Create an empty wiki if wiki import failed
  Resolve "group request membership mail with too long list of "To:""
  Add changelog entry
  Fix single digit value clipping
  specify date format
  Increase feature flag cache TTL to one hour
  Convert Gitaly commit parent IDs to array as early as possible
  Clarify changelog for squash encoding fix
  Avoid slow File Lock checks when not used
  Fix squash rebase not working when diff contained encoded data
  ...