During a merge, we attempt to find a matching merge request with a SHA
using a replica that should be up-to-date with the primary for a given
PostgreSQL log sequence number (LSN). However, there is a race condition
that can happen if service discovery alters the host list after this
check has taken place. This most likely happens when a Web worker
starts:

1. When Rails starts up for the first time, there is a 1-minute or
2-minute delay before service discovery finds replicas
(see https://gitlab.com/gitlab-org/gitlab/-/issues/271575).

2. During this time `LoadBalancer#all_caught_up?` will return
`true`. This will indicate to the Web worker that it can use replicas
and does not have to use the primary.

3. During a request, service discovery may load all the replicas and
change the host list. As a result, the next read may be directed to a
lagging replica.

However, this may cause a merge to fail if it cannot find a match.

When a user merges a merge request, Sidekiq logs the minimum LSN needed
to match a merge request for the API. If we have this LSN, we now:

1. Select from the available list of replicas that meet this LSN
requirement.
2. Store this subset for the given request.
3. Round-robin reads with this subset of replicas.

Relates to https://gitlab.com/gitlab-org/gitlab/-/issues/247857

Add documentation for configuring Microsoft Graph with MailRoom

See merge request gitlab-org/gitlab!59084

Update old test case link with max comments

See merge request gitlab-org/gitlab!59410

Update older testcase issue links

See merge request gitlab-org/gitlab!59311

Document permission to manage group push rules

See merge request gitlab-org/gitlab!59333

Prevent manual upload of cloud license

See merge request gitlab-org/gitlab!58709

Highlight paid features during active trial - Part 1 of 4

See merge request gitlab-org/gitlab!56155

Part 1 of 4.

Sets the groundwork for the “Highlight paid features during active trial”
experiment. Mainly, it sets up a new experiment using the `gitlab-experiment`
gem (GLEX) and creates the initial badge component that will be used as the
building block for the rest of the experiment features.

Docs: Surface merge approval rules in permissions list

See merge request gitlab-org/gitlab!59384

Allow Add Comment To Review

See merge request gitlab-org/gitlab!51718

https://gitlab.com/gitlab-org/gitlab/-/merge_requests/51718

Update UI text in the drone integration

See merge request gitlab-org/gitlab!59231

Merge branch '323676-add-index-on-created-at-web-hook-id-to-partitioned-web-hook-logs' into 'master'

Add index to partitioned web_hook_logs (Part 1 of 3)

See merge request gitlab-org/gitlab!59261

Return 403 when job is deleted

See merge request gitlab-org/gitlab!59382

Updates the LicenseController#create action to prevent cloud licenses
from being created.  Presents an alert to the user to upload a valid
license.

Improve LicenseController specs with expectations on the creation of
License records.

- Add the index on (created_at, web_hook_id) that
is defined for web_hook_logs to the partitioned version
of the table

Fix a 'Style/RegexpLiteralMixedPreserve' RuboCop offense

See merge request gitlab-org/gitlab!59404

Document On-demand Scans Authentication options

See merge request gitlab-org/gitlab!59169

Merge branch 'philipcunningham-enable-additional-fields-feature-flag-by-default-292897' into 'master'

Enable DAST extra fields feature flag by default

See merge request gitlab-org/gitlab!58859

When a job get's deleted a 404 is return which is HTTP semantically
correct. A 404 can be a temporary problem on the network which the
Runner will retry the request.

This prevents from deleted jobs running until timeout.

reference https://gitlab.com/gitlab-org/gitlab-runner/-/issues/27765

Promote dependencies section

See merge request gitlab-org/gitlab!59338

Document Billable Memberships API

See merge request gitlab-org/gitlab!59315

Active integrations should be displayed in a separate table

See merge request gitlab-org/gitlab!57198

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

Add debug info to Pages::LookupPath::LegacyStorageDisabledError

See merge request gitlab-org/gitlab!59265

Restrict group level approval settings to top level group

See merge request gitlab-org/gitlab!59225

Add Source Members Url to Billable Memberships API

See merge request gitlab-org/gitlab!59312

Externalise strings in sessions/_new_crowd.html.haml

See merge request gitlab-org/gitlab!58269

Add fork form FF to docs

See merge request gitlab-org/gitlab!56461

Fix RSpec/EmptyLineAfterFinalLetItBe for ee/spec/services/security

See merge request gitlab-org/gitlab!58323

Bump recommended Redis version from 4.0 to 5.0

See merge request gitlab-org/gitlab!59072