Fix ActiveRecord connection leaks

Closes #27949 and gitlab-com/infrastructure#1139

See merge request !9109

Display loading indicator when filtering ref switcher dropdown

Closes #27966

See merge request !9144

Resolve "GroupsController#activity.json is REALLY slow due to SQL"

Closes #27395

See merge request !9088

Respect autocrlf setting when creating/updating file through web UI

Closes gitlab-com/www-gitlab-com#1152

See merge request !9198

Add indices to improve loading of labels page

Closes #25413

See merge request !9121

Fix current build arrow

Closes #27939

See merge request !9154

Updated issue boards docs

Closes #27872

See merge request !9097

Adds container to tooltip in order to make it work with overflow:hidden in parent element

Closes #28032

See merge request !9170

Resolve "Icon in issue search dropdown still animates"

Closes #28034

See merge request !9156

Merge branch '27947-missing-margin-between-loading-icon-and-text-in-merge-request-widget' into 'master'

Resolve "Missing margin between loading icon and text in Merge Request Widget"

Closes #27947

See merge request !9119

Move merge requests index file inside the merge_requests dir

See merge request !9181

Resolve "Improve blockquote formatting in notification emails"

Closes #28029

See merge request !9157

Only show MR widget graph if there are stages

Closes #27987

See merge request !9141

Replace teaspoon references with Karma

Closes gitlab-com/gitlab-docs#68

See merge request !9011

Fix job to pipeline renaming

Closes #28016

See merge request !9147

Don't perform Devise trackable updates on blocked User records

Closes #27519

See merge request !8915

Add index to ci_trigger_requests for commit_id

See merge request !9124

Remove orange caret icon from MR widget

Closes #27991

See merge request !9137

Make min width smaller for user settings

See merge request !9112

Fix admin_labels_spec.rb transient failure

Closes #27855

See merge request !9135

Show Pipeline(not Job) in MR CI status desktop notification

Closes #27955

See merge request !9122

Upgrade to webpack v2.2.1

See merge request !9078

Fix contribution activity alignment

Closes #27943

See merge request !9101

Adds a null check to build notifications

Closes #27948

See merge request !9108

Upgrade from Babel 5 to Babel 6

See merge request !9072

Refactored diff notes Vue app

See merge request !9065

Correctly transform an anchor link to GFM when copying it

See merge request !9080

Reduce padding of mr widget mini graph

See merge request !9071

Looks for correct key to pass to commit prop. Adds rspec test.

Closes #27880

See merge request !9070

Fixed random merge request widget failure

Closes #27806

See merge request !9068

Backport fixes for pipelines_store frontend specs

Closes #27871

See merge request !9067

Update GitLab pages to v0.3.0

See merge request !9043

lfs: do not require auth for public repositories

Closes #23360

See merge request !8824

Added help box where backlog list used to be

See merge request !9106