* master: (34 commits)
  Add a lint check to restrict use of Rugged, EE version
  Fix EE offenses to the RSpec/SingleLineHook cop
  Update qa.rb
  Use flash message instead of regular text block
  Update common.rb
  Update gitlab-styles and re-enable the RSpec/SingleLineHook cop again
  Move EE-specific migrations under ee/db/
  Make Gitlab::Git::Repository#run_git private
  Update secret_values to support dynamic elements within parent
  Improve PostgreSQL warning message in Rake task
  Improve warning message about the replication status
  Add a warning for Postgresql < 9.6 when show replication status
  Refactored expand_section to use name instead of selector
  Refactored view/element definition to dry up
  add view/element, some small fixes and code refactor
  Small fixes and codestyle changes
  Reduced rename replication spec steps to the bare minimum.
  Dont send enter key
  Refactor to address codestyle feedback
  Make AdvancedSettings a Page and move `rename_to to it.
  ...

Add a lint check to restrict use of Rugged, EE version

See merge request gitlab-org/gitlab-ee!4251

Geo: Improve replication status. Using pg_stat_wal_receiver

Closes #3256

See merge request gitlab-org/gitlab-ee!4187

Make Gitlab::Git::Repository#run_git private, EE version

See merge request gitlab-org/gitlab-ee!4228

Add Epic information for selected issue in Issue boards sidebar

Closes #4289

See merge request gitlab-org/gitlab-ee!4104

Update secret_values to support dynamic elements within parent -- EE merge edition

See merge request gitlab-org/gitlab-ee!4222

Fix conflicts for app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_conflicts.vue

Fix conflicts for app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_closed.vue

Fix conflicts for  app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_checking.vue

[EE]  Resolve "Re-enable the `RSpec/SingleLineHook` cop"

See merge request gitlab-org/gitlab-ee!4248

Move EE-specific migrations under ee/db/

Closes #3094

See merge request gitlab-org/gitlab-ee!3831

Geo project replication QA

See merge request gitlab-org/gitlab-ee!3893

# Conflicts:
#	app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_checking.vue
#	app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_closed.vue
#	app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_conflicts.vue
#	app/assets/javascripts/vue_merge_request_widget/dependencies.js

[ci skip]

Make Gitaly RepositoryExists opt-out

See merge request gitlab-org/gitlab-ce!16680

Look at system notes created just before merge as well as after, when deciding if an MR can be reverted

Closes #42377

See merge request gitlab-org/gitlab-ce!16678

Add note within ux documentation that further changes should be made within the…

See merge request gitlab-org/gitlab-ce!16686

Signed-off-by: Rémy Coutable <remy@rymai.me>

Resolve "Asset was not declared to be precompiled in production, favicon-green.ico"

Closes #4666

See merge request gitlab-org/gitlab-ee!4212

Resolve "High rate of config.lock file errors on Geo testbed"

Closes #4693

See merge request gitlab-org/gitlab-ee!4249

CE upstream - Wednesday

Closes gitaly#921 and gitaly#929

See merge request gitlab-org/gitlab-ee!4242

Default to HTTPS for all Gravatar URLs

See merge request gitlab-org/gitlab-ce!16666

Generate ssh key on the fly for QA

See merge request gitlab-org/gitlab-ce!16562

Moves status icon into a vue file and adds tests

See merge request gitlab-org/gitlab-ce!16703

Add modal for deleting a milestone (EE port)

Closes gitlab-ce#41314

See merge request gitlab-org/gitlab-ee!4157

Add modal for deleting a milestone

Closes #41314

See merge request gitlab-org/gitlab-ce!16229

Revert "Merge branch 'osw-updates-merge-status-on-api-actions' into 'master'"

See merge request gitlab-org/gitlab-ce!16707

On MySQL, at least, `Note#created_at` doesn't seem to store fractional seconds,
while `MergeRequest::Metrics#merged_at` does. This breaks the optimization
assumption that we only need to search for notes created *after* the MR has
been merged.

Unsynchronized system clocks also make this a dangerous assumption to make.

Adding a minute of leeway still optimizes away most notes, but allows both
cases to be handled more gracefully. If the system clocks are more than a
minute out, we'll still be broken, of course.

This reverts commit 9f5390d8, reversing
changes made to c28ffa1d.

Revert "Merge branch 'remove-rugged-walk' into 'master'"

See merge request gitlab-org/gitlab-ce!16676

This reverts merge request !16626

Signed-off-by: Rémy Coutable <remy@rymai.me>

Can parse root .gitattributes file for a ref

See merge request gitlab-org/gitlab-ce!16418