We have a number of keys that are over 1 MB that would be compressed
significantly (over 90%) if this feature were enabled. We had this
disabled by default to ensure backwards compatibility with the previous
Redis store.

We should enable it now because compression significantly reduces the
pressure on the Redis server. Every time a large payload is stored in
Redis, Redis may need to evict many small keys to make room.

This adds a little more CPU overhead on the application workers, which
is why we have an environment variable
(`ENABLE_REDIS_CACHE_COMPRESSION`) to turn if off it it becomes a
problem.

Behind the scenes, Rails implements this by serializing a `compressed`
variable with the `ActiveSupport::Cache::Entry` if the payload size
exceeds the compression threshold (4K by default). When the entry is
deserialized from Redis, if the `compressed` boolean is set, the value
will be decompressed. Thus even in a mixed-deployment where this setting
is not on by default, Rails will be able to decode compressed values
just fine.

Closes https://gitlab.com/gitlab-org/gitlab/issues/198586

Prevent default overwrite for theme and color ID in user API

See merge request gitlab-org/gitlab!26792

Refactor notebook_viewer to vue SFC

See merge request gitlab-org/gitlab!27090

https://gitlab.com/gitlab-org/gitlab/-/merge_requests/27090

Move approximate counters to batch counting

See merge request gitlab-org/gitlab!27218

Migrate ee/custom_metrics to Jest

Closes #194274

See merge request gitlab-org/gitlab!27139

Move Caching module out of GithubImporter namespace to be reused

See merge request gitlab-org/gitlab!27096

Move finders related to CI under the namespace

See merge request gitlab-org/gitlab!27190

Add package_type as parameter to group packages list api

See merge request gitlab-org/gitlab!26833

Added package_type param to api options
Updated tests
Updated documentation
Added changelog entry

Move feature category of ProjectUpdateRepositoryStorage to Gitaly

See merge request gitlab-org/gitlab!27165

Replace underscore/lodash in feature_flags

Closes #210264

See merge request gitlab-org/gitlab!27130

Refactor pdf_viewer to sfc

See merge request gitlab-org/gitlab!26894

https://gitlab.com/gitlab-org/gitlab/-/merge_requests/26894

Add disqus redirects to moved docs

See merge request gitlab-org/gitlab!27221

Send email notifications for Generic Alerts docs

Closes #207488

See merge request gitlab-org/gitlab!26856

Enable MR :single_mr_diff_view feature flag by default

See merge request gitlab-org/gitlab!24821

Support DotEnv Variables through report type artifact

See merge request gitlab-org/gitlab!26247

Remove ~bug label from QA Failure template

See merge request gitlab-org/gitlab!26989

Turn on new_variables_ui feature flag

See merge request gitlab-org/gitlab!26901

Add `options` parameter to `convertObjectPropsToSnakeCase`

See merge request gitlab-org/gitlab!25569

This commit adds support for `artifacts:report:dotenv`

Minor text changes

Make the changelog title make
more sense to users.

Use timecop to lock date to 20200312 for certs

Closes #210557

See merge request gitlab-org/gitlab!27239

Performance development docs: Link to mass insert

See merge request gitlab-org/gitlab!27083

Optimize Project related count service desk enabled

See merge request gitlab-org/gitlab!27115

Cleanup what services are running on Gitaly standalone

See merge request gitlab-org/gitlab!26060

Fix capitalization on HAProxy

See merge request gitlab-org/gitlab!27131

Added JSON License

See merge request gitlab-org/gitlab!26122

Add docs for the edit custom metric link

See merge request gitlab-org/gitlab!26518

Add deprecation note for Severity and Confidence levels

See merge request gitlab-org/gitlab!26984