Starting with GitLab 9.1.0 we will no longer allow downtime migrations
unless absolutely necessary. This commit updates the various developer
guides and adds code that is necessary to make zero downtime migrations
less painful.

Api fix build events rename to Job events

Closes #30412

See merge request !10586

Use gRPC 1.2.2

Closes #30766

See merge request !10589

Hide new subgroup button if user has no permission to create one

Closes #30139

See merge request !10627

Setup and run a Gitaly server for testing if GitalyClient is enabled

See merge request !10298

Fix issue's note cache expiration after delete

Closes #30457

See merge request !10461

When renaming, the argument on the projects hook API was forgotten. Now
one could successfully set it again.

The fix is a little ugly stylewise, but needed as the underlying model
still refers to it as build_events. This commit is to fix it, later we
should migrate the data to a new column. The edit on the spec file makes
sure it passes now, and will fail when we migrate the column.

[BB Importer] Save the error trace and the whole raw document

See merge request !9604

Documentation topic: Authentication

Closes #30744

See merge request !10608

Link to outdated diff in older MR version from outdated diff discussion

Closes #27865

See merge request !10572

Resolve "API: Separate CE params to avoid wrong conflict resolutions"

Closes #28017

See merge request !10484

Fixed notebooklab code including file paths

See merge request !10629

Update installation and upgrading guides

[ci skip]

See merge request !10621

Fix "Edit" button on blame page without repo permissions

Closes #30636

See merge request !10598

Update licenses.csv

[ci skip]

See merge request !10620

Update templates

See merge request !10619

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

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

New git index

See merge request !10349

Remove unused scopes

See merge request !10609

Add foreign key on trigger requests

See merge request !10537

Change project view default for existing users and anonymous visitors to files+readme

Closes #29926

See merge request !10498

https://gitlab.com/gitlab-org/release-tools/blob/master/doc/release-candidates.md#step-1-update-the-installation-from-source-guide

In step 1 and step 2

Added keyboard shortcuts to signed out menu

See merge request !10526

license_finder report --format=csv --save=vendor/licenses.csv

rake gitlab:update_templates

Fix the MR widget that merged any MR when choosing the option "Merge when pipeline succeeds" from the dropdown

Closes #29568

See merge request !10611

Fix container repository/tag location text copied into the clipboard

Closes #30695

See merge request !10587

I started out as I missed the foreign key on ci_triggers and projects.
However, it seemed Yorick caught this already on gitlab-org/gitlab-ce!9388.

Still I found a missing foreign key, between the trigger requests and
triggers. This commit adds it, and removes the depend: :destroy on the
Rails model Ci::Triggers

Remove redundant steps from .gitlab-ci-yml configs

See merge request !10425

Fixed wrong links in README.md

See merge request !10556

Set NODE_ENV for yarn:install in patch_versions.md

See merge request !10521

Issue 22424: Add tooltip to header of Done list

Closes #22424

See merge request !10574

Move the nested groups seed behind an environment flag

See merge request !10601