Add ExclusiveLease guards for RepositoryCheck::{DispatchWorker,BatchWorker}

See merge request gitlab-org/gitlab-ce!20441

Make it clear that we need to enable omniauth for SAML and Bitbucket

See merge request gitlab-org/gitlab-ce!20421

CE: Move mailer preview to app directory

See merge request gitlab-org/gitlab-ce!20430

We saw in production that DispatchWorker was running about twice an hour,
which would schedule twice as many jobs as it should.

For some reason, BatchWorker was running 1000 times per hour, possibly
due to Sidekiq RSS kills that caused these jobs to restart.

Adding an ExclusiveLease prevents these jobs from running more
than they should.

Relates to https://gitlab.com/gitlab-com/infrastructure/issues/4526

Ability to check if underlying database is read only

See merge request gitlab-org/gitlab-ce!20345

Remove silly use of repo disk path

See merge request gitlab-org/gitlab-ce!20436

Add Repository#set_config and #delete_config

See merge request gitlab-org/gitlab-ce!20372

Add a new scenario to test GitHub import

Closes gitlab-qa#146

See merge request gitlab-org/gitlab-ce!19555

Delete deprecated object_storage_upload queue

See merge request gitlab-org/gitlab-ce!20371

Improves MR refactor getters and state and adds specs

Closes #48937

See merge request gitlab-org/gitlab-ce!20429

Update GitLab Pages to v1.0.0

See merge request gitlab-org/gitlab-ce!20404

(Part 2) Resolve "Recognise when a user is trying to validate a private SSH key"

Closes #46396

See merge request gitlab-org/gitlab-ce!19997

Revert "Merge branch 'rosulk-patch-12' into 'master'"

See merge request gitlab-org/gitlab-ce!20428

Resolve "Add dropdown to Groups link in top bar"

Closes #36234

See merge request gitlab-org/gitlab-ce!18280

Preload ancestors after pagination when filtering

Closes #40785

See merge request gitlab-org/gitlab-ce!20398

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

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

Exports state to allow tests
Adds specs for the getters that didn't have any.

Merge branch 'blackst0ne-rails5-activerecord-statementinvalid-mysql2-error-expression-1-of-select-list-is-not-in-group-by-clause' into 'master'

[Rails5] Fix milestone GROUP BY query

Closes #48428

See merge request gitlab-org/gitlab-ce!20256

We need to preload the ancestors of search results after applying
pagination limits. This way the search results itself are paginated,
but not the ancestors.

If we don't do this, we might not preload a parent group of a search
result as it has been cut off by pagination.

Extract EE-specific lines from NotificationService

See merge request gitlab-org/gitlab-ce!20406

This reverts merge request !19250

Allow to store BuildTraceChunks on Object Storage

Closes #45712

See merge request gitlab-org/gitlab-ce!19515

Partially revert "Revert "Merge branch 'gitaly-mandatory-20180703-jv' into 'master'""

See merge request gitlab-org/gitlab-ce!20422

Backport of EE changes "Add support for autocompleting Epics and Labels within Epics"

See merge request gitlab-org/gitlab-ce!20419

Added merge request info to Web IDE sidebar

Closes #45187

See merge request gitlab-org/gitlab-ce!19860

Resolve "Undefined omniauth_authorize_path when omniauth_enabled not enabled"

Closes #48677

See merge request gitlab-org/gitlab-ce!20302

Create cross project group features

See merge request gitlab-org/gitlab-ce!20333

This partially reverts commit 64dfe2cb.