Add cache clearing documentation

See merge request gitlab-org/gitlab-ee!4152

Merge branch '4632-move-ee-specific-models-and-serializers-to-ee-app-models-serializers-directory' into 'master'

Resolve "Move EE-specific models and serializers to `ee/app/{models,serializers}` directory"

Closes #4632

See merge request gitlab-org/gitlab-ee!4131

Ee dispatcher projects

See merge request gitlab-org/gitlab-ee!4117

CE upstream - Thursday

Closes gitaly#923

See merge request gitlab-org/gitlab-ee!4150

[ci skip]

[ci skip]

Fix Epic sidebar toggle button icon positioning

Closes #4616

See merge request gitlab-org/gitlab-ee!4138

[ci skip]

[ci skip]

Docs: set comments to false on deprecated articles list doc

See merge request gitlab-org/gitlab-ee!4105

Docs: set comments to false on deprecated articles list doc

See merge request gitlab-org/gitlab-ce!16498

[ci skip]

[ci skip]

[ci skip]

Fix: fix typo  to open source

See merge request gitlab-org/gitlab-ce!16549

Retrieve commit signatures with Gitaly

Closes gitaly#923

See merge request gitlab-org/gitlab-ce!16467

Remove Rugged::Walker from Repository#log

Closes #42089

See merge request gitlab-org/gitlab-ce!16525

Small fixes to Geo database configuration doc

See merge request gitlab-org/gitlab-ee!3991

Merge branch '4638-master-failure-in-spec-ee-spec-lib-gitlab-geo-log_cursor-daemon_spec-rb' into 'master'

Resolve "`master` failure in spec/ee/spec/lib/gitlab/geo/log_cursor/daemon_spec.rb"

Closes #4638

See merge request gitlab-org/gitlab-ee!4144

Merge branch '42172-deprecation-warning-timestamps-was-called-without-specifying-an-option-for-null-in-rails-5-this-behavior-will-change-to-null-false' into 'master'

Resolve "DEPRECATION WARNING: `#timestamps` was called without specifying an option for `null`. In Rails 5, this behavior will change to `null: false`..."

Closes #42172

See merge request gitlab-org/gitlab-ce!16545

Fix spec/migrations/update_upload_paths_to_system_spec.rb to use the :migration metadata

See merge request gitlab-org/gitlab-ce!16546

CE upstream - Thursday

See merge request gitlab-org/gitlab-ee!4143

Get rid of a Rails 5 deprecation warning in db/migrate/20170425112128_create_pipeline_schedules_table.rb
Signed-off-by: Rémy Coutable <remy@rymai.me>