<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=385262) </details> <!--IssueSummary end--> * Epic: gitlab-org&9313 * After https://gitlab.com/gitlab-org/gitlab/-/issues/383458+ is introduced ### Requirements We should have a documentation about: 1. deprecation of `Rails.cache` and a possible alternative 2. advantages of the new Redis wrapper