Add documentation

Git differentiates the author and committer so that the person who
writes the change can be acknowledged even though someone else committed
it. Suggestions may be proposed by a different person to who applies the
change. If this information is lost, the provenance of the change can be
hard to discern.

Externalize strings in users/_profile.html.haml

See merge request gitlab-org/gitlab!58106

Update Usage Ping Metrics - Alerting

See merge request gitlab-org/gitlab!60044

Load correct data when switching branches in pipeline editor

See merge request gitlab-org/gitlab!57941

Resolve "Expose webhook data for Key via its own data-builder class"

See merge request gitlab-org/gitlab!59608

Enable Style/ParenthesesAroundCondition cop for HAML-lint

See merge request gitlab-org/gitlab!59553

Docs: add troubleshooting for schannel error for TLS

See merge request gitlab-org/gitlab!59922

Add Free tier to Pages-related docs

See merge request gitlab-org/gitlab!60003

Crop image for dashboard templates doc

See merge request gitlab-org/gitlab!60041

Update Gitaly version

See merge request gitlab-org/gitlab!60093

Remove unnecessary image from tracing doc

See merge request gitlab-org/gitlab!60056

Move Debian endpoints concern to correct file

See merge request gitlab-org/gitlab!59811

Merge branch '322786-denormalize-project-permissions-to-merge-request-in-elasticsearch' into 'master'

Denormalize project permissions to merge request in Elasticsearch

See merge request gitlab-org/gitlab!59731

Add Packages::Debian::GenerateDistributionKeyService

See merge request gitlab-org/gitlab!53826

Backend for implementing real-time issue assignees using GraphQL subscriptions

See merge request gitlab-org/gitlab!59834

Resolve "JWT API token support for Terraform Module Registry"

See merge request gitlab-org/gitlab!56421

Review and revise YouTrack integration UI text

See merge request gitlab-org/gitlab!59998

Add metrics to monitor pipelines with policy jobs

See merge request gitlab-org/gitlab!59848

Optimize Nokogiri search for post-processing pipeline [RUN ALL RSPEC] [RUN AS-IF-FOSS]

See merge request gitlab-org/gitlab!59983

Users search: fix avatar size

See merge request gitlab-org/gitlab!59883

Refactor Key event data for webhooks

Handle Rails 6.1 ActiveModel::Errors changes

See merge request gitlab-org/gitlab!59861

Add validation to fork form with validation directive

See merge request gitlab-org/gitlab!55838

Contributes to https://gitlab.com/gitlab-org/gitlab/-/issues/271242

**Problem**

doc.search(...) operation has a bad performance for complex html
documents with many elements.

**Solution**

Avoid unnecessary doc.search calls.

1. Combine multiple search operations
2. Share calculated result between several filters

Reduce number of SQL queries on SystemNote create

See merge request gitlab-org/gitlab!59102

Update testcase links to new ones

See merge request gitlab-org/gitlab!60067

Return connection error for activation

See merge request gitlab-org/gitlab!59840

Modal errors as objects are introduced:
https://github.com/rails/rails/pull/32313

model.errors.first returns ActiveModel::Error object
that's why model.errors.first[1] doesn't work in Rails 6.1

We need a way that works both for 6.1 and 6.0 in order to
introduce changes gradually:

model.errors.values.first works for both versions.

Even though treating errors as a hash is deprecated it works
so we can introduce the changes in 6.0 and then fix the
deprecations when we're on 6.1

(cherry picked from commit b5ecc309314429040921233d4a6216655fede089)

Avoid creating note in rollout issue

See merge request gitlab-org/gitlab!60083

Fix RSpec/EmptyLineAfterFinalLetItBe for ee/spec/lib/gitlab/elastic

See merge request gitlab-org/gitlab!58381