Create a post-deployment migration to update all existing notification settings
with at least one custom level enabled to the new format. Also handle the same
conversion when updating settings, to catch any stragglers.

Add columns for each custom notification level, defaulting to null. Read from
those columns if non-null, otherwise fall back to the serialized column. Writing
will write to the new column if `events` isn't manually set.

#13336 - display multiple messages in both the UI and git output

Closes #13336

See merge request !11113

Document a new migrations testing technique

Closes #33565

See merge request !12181

Add age color mapping to blame view

Closes #23998

See merge request !7198

Make spec/spec_helper consistent with EE by including a :routing type

See merge request !12178

Do not show manual actions that cannot be run

Closes #32380

See merge request !12121

Backport merge_params.html.haml conflict comment

See merge request !12138

Instrument MergeRequestDiff#load_commits

See merge request !12162

Don't return nil for missing objects from parser cache

See merge request !12168

Fix note highlight being lost after real time update

Closes #33483

See merge request !12098

Fix milestone page assignees when dropped in ongoing list

Closes #32861

See merge request !12076

Update /target_branch slash command description to be more consistent

See merge request !12175

Require rubocop-rspec in the correct location

See merge request !12174

Resolves the `codeclimate` CI failure

Fix autocomplete not working on note edit form

Closes #33529

See merge request !12106

Fixed pipelines Vue template not ending correctly

See merge request !12170

Move remove token of Select2 to the right

See merge request !12101

Add a custom RSpec/SingleLineHook cop

Closes #24891

See merge request !11911

This cop adds an offense when `before`, `after`, or `around` are used as
single-line blocks.

Fix fenced code block misalignment in events/activity

Closes #31263

See merge request !12149

Add codeclimate job to .gitlab-ci.yml

See merge request !12086

more visual contrast for active page in pagination widget

Closes #32470

See merge request !12119

Allow more customization to Help landing page

See merge request !11878

Implement diff viewers

Closes #30501 and #19931

See merge request !11777

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/33529

Bug introduced in
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/11278

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/32861

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/33483

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>