Merge branch...

Merge branch '354327-update-development-pipelines-documentation-about-our-redis-testing-strategy' into 'master'

Update pipelines docs about our Redis testing strategy

See merge request gitlab-org/gitlab!82179

doc/development/pipelines.md

@@ -301,6 +301,21 @@ We follow the [PostgreSQL versions shipped with Omnibus GitLab](../administratio
 | PG11               | `nightly`              | `nightly`              | `nightly`              | `nightly`              | `nightly`              | `nightly`              |
 | PG13               | `nightly`              | `nightly`              | `nightly`              | `nightly`              | `nightly`              | `nightly`              |
 
+## Redis versions testing
+
+Our test suite runs against Redis 6 as GitLab.com runs on Redis 6 and
+[Omnibus defaults to Redis 6 for new installs and upgrades](https://gitlab.com/gitlab-org/omnibus-gitlab/-/blob/master/config/software/redis.rb).
+
+We do run our test suite against Redis 5 on `nightly` scheduled pipelines, specifically when running backward-compatible and forward-compatible PostgreSQL jobs.
+
+### Current versions testing
+
+| Where? | Redis version |
+| ------ | ------------------ |
+| MRs    | 6 |
+| `default branch` (non-scheduled pipelines) | 6 |
+| `nightly` scheduled pipelines | 5 |
+
 ## Pipelines types for merge requests
 
 In general, pipelines for an MR fall into one of the following types (from shorter to longer), depending on the changes made in the MR:
@@ -541,6 +556,8 @@ that are scoped to a single [configuration keyword](../ci/yaml/index.md#job-keyw
 | `.use-pg11-ee` | Same as `.use-pg11` but also use an `elasticsearch` service (see [`.gitlab/ci/global.gitlab-ci.yml`](https://gitlab.com/gitlab-org/gitlab/-/blob/master/.gitlab/ci/global.gitlab-ci.yml) for the specific version of the service). |
 | `.use-pg12` | Allows a job to use the `postgres` 12 and `redis` services (see [`.gitlab/ci/global.gitlab-ci.yml`](https://gitlab.com/gitlab-org/gitlab/-/blob/master/.gitlab/ci/global.gitlab-ci.yml) for the specific versions of the services). |
 | `.use-pg12-ee` | Same as `.use-pg12` but also use an `elasticsearch` service (see [`.gitlab/ci/global.gitlab-ci.yml`](https://gitlab.com/gitlab-org/gitlab/-/blob/master/.gitlab/ci/global.gitlab-ci.yml) for the specific version of the service). |
+| `.use-pg13` | Allows a job to use the `postgres` 13 and `redis` services (see [`.gitlab/ci/global.gitlab-ci.yml`](https://gitlab.com/gitlab-org/gitlab/-/blob/master/.gitlab/ci/global.gitlab-ci.yml) for the specific versions of the services). |
+| `.use-pg13-ee` | Same as `.use-pg13` but also use an `elasticsearch` service (see [`.gitlab/ci/global.gitlab-ci.yml`](https://gitlab.com/gitlab-org/gitlab/-/blob/master/.gitlab/ci/global.gitlab-ci.yml) for the specific version of the service). |
 | `.use-kaniko` | Allows a job to use the `kaniko` tool to build Docker images. |
 | `.as-if-foss` | Simulate the FOSS project by setting the `FOSS_ONLY='1'` CI/CD variable. |
 | `.use-docker-in-docker` | Allows a job to use Docker in Docker. |