Fetching all references for a repository uses SMEMBERS, which can be
quite slow. We need to fetch all references to resolve ambiguities in
certain edge cases. However, most references do not contain a slash, and
most repositories do not contain ambiguous references (where a tag is a
prefix of a branch or vice versa).

In those cases, we can trade two slow-ish Redis calls (SMEMBERS to get
all tags and branches) for a maximum of four much faster Redis calls,
because they are all GETs:

1. One for the feature flag (which will go away in future hopefully).
2. One to check if the repository has ambiguous refs.
3. One for checking membership of branch names.
4. One for checking membership of tag names (only if we didn't match a
   branch).

In the worst case - when the repository does not contain ambiguous refs
- we add those calls to the existing calls, but this should still not be
a huge amount of overhead in that case.

When the feature flag is disabled (which is the default), we're just
adding a single GET.

A branch can't be a prefix (including a slash) of another branch. For
instance, you can't have a branch `a` and a branch `a/b`. Same with
tags. However, you can have a branch `a` and a tag `a/b`, which is
ambiguous.

In ExtractsRef, we do some work to handle these cases. That can involve
a fairly slow Redis SMEMBERS call. If a repository has no ambiguous refs
of this form (which should be the majority), we can perform some
optimisations.

For the purposes of this method, we only consider refs ambiguous before
the first slash. If we have a branch `a/b/c` and a tag `a/b`, this
method won't detect that.

Upgrade to Git v2.28.0

See merge request gitlab-org/gitlab!38152

Updates security templates to mention edge cases

See merge request gitlab-org/gitlab!38708

Avoid writing empty stage variable

See merge request gitlab-org/gitlab!38631

Add internal api for getting personal access tokens from gitlab-shell

See merge request gitlab-org/gitlab!36302

Re-add data-qa selector

Closes #229724

See merge request gitlab-org/gitlab!38055

Remove FDW related code for project/wikis

Closes #223249

See merge request gitlab-org/gitlab!38417

Fix duplicate button issue in monitor core spec

See merge request gitlab-org/gitlab!38482

* Renames 'Security Release' template to 'Security Release Tracking
  Issue'
* Remove unnecessary section from the Security Release Tracking Issue
  (such as QA)
* Add an item to the 'Security Developer Workflow' to specify issues
  with less than 4 MR associated need to be notified to Release Managers

Optimise ExtractsRef when there is no slash

See merge request gitlab-org/gitlab!38343

Adds urls to package presenter

See merge request gitlab-org/gitlab!38518

Add metrics dashboard templates for the standard selector

See merge request gitlab-org/gitlab!37519

Revise the Status Page doc for tone and style

See merge request gitlab-org/gitlab!37864

Start revising the Status Page documentation for tone, style, and
completeness.

Add metadata to more Configure pages

Closes #233532

See merge request gitlab-org/gitlab!38702

Replace deprecated button

Closes #219901

See merge request gitlab-org/gitlab!38668

https://gitlab.com/gitlab-org/gitlab/-/issues/219791

The Configure team has taken ownership of a few more pages, so this
MR adds metadata to them.

[RUN AS-IF-FOSS] Resolve Style/NumericPredicate Cop exceptions in lib

See merge request gitlab-org/gitlab!38333

Add relative positioning on designs

See merge request gitlab-org/gitlab!37835

This adds the metrics dashboard templates to the
file template selector in the standard editor from
the repository view

Show only root namespaces for subscriptions

See merge request gitlab-org/gitlab!38481

Change query to request incidents by issue type

See merge request gitlab-org/gitlab!38503

Enable similarity search feature flags by default

Closes #221043

See merge request gitlab-org/gitlab!38675

Hide health status labels for closed issues on epics tree

See merge request gitlab-org/gitlab!37561

Show health status only for open issues

Update the mock data as well

Update the doc

Update the spec

Replace more utility classes

Update the display condition for epics

Use parameterized tests in the spec
Update the mock data

Apply 1 suggestion(s) to 1 file(s)

Add ability to query DAST scanner profiles

See merge request gitlab-org/gitlab!38126

Add when: never details

See merge request gitlab-org/gitlab!37761

Resolve "Take DAG visualization out of beta"

See merge request gitlab-org/gitlab!38517

We remove the beta tag on the tab,
the beta alert message in the view and
all documentation that mentioned
the dag view as a beta feature.

Gitaly is moving its minimum required version of Git to v2.28.0. Adjust
our documentation to match.

The Git version check hasn't been updated in a while and is still at
v2.22.0, even though the minimum required version of Git is in fact
v2.25.0. Now that Gitaly has bumped its requirements to v2.28.0, let's
fix the system check to match.

As Git v2.28.0 has been released and Gitaly has the intention to make it
the minimum required version, let's update GitLab's CI to use the new
version.

Process panels YAML to JSON

See merge request gitlab-org/gitlab!38279

Add support for files in ProjectSnippets REST API

See merge request gitlab-org/gitlab!38485

This change enables the following feature flags by default:

- analytics_similarity_search
- similarity_search