Revert "Merge branch 'omnibus-5505-remove-pg11' into 'master'"

This reverts merge request !63480

.gitlab/ci/global.gitlab-ci.yml

@@ -181,6 +181,15 @@
     - *node-modules-cache-push
     - *assets-cache-push
 
+.use-pg11:
+  image: "registry.gitlab.com/gitlab-org/gitlab-build-images:ruby-2.7.2.patched-golang-1.16-git-2.31-lfs-2.9-chrome-89-node-14.15-yarn-1.22-postgresql-11-graphicsmagick-1.3.36"
+  services:
+    - name: postgres:11.6
+      command: ["postgres", "-c", "fsync=off", "-c", "synchronous_commit=off", "-c", "full_page_writes=off"]
+    - name: redis:5.0-alpine
+  variables:
+    POSTGRES_HOST_AUTH_METHOD: trust
+
 .use-pg12:
   image: "registry.gitlab.com/gitlab-org/gitlab-build-images:ruby-2.7.2.patched-golang-1.16-git-2.31-lfs-2.9-chrome-89-node-14.15-yarn-1.22-postgresql-12-graphicsmagick-1.3.36"
   services:
@@ -190,6 +199,17 @@
   variables:
     POSTGRES_HOST_AUTH_METHOD: trust
 
+.use-pg11-ee:
+  image: "registry.gitlab.com/gitlab-org/gitlab-build-images:ruby-2.7.2.patched-golang-1.16-git-2.31-lfs-2.9-chrome-89-node-14.15-yarn-1.22-postgresql-11-graphicsmagick-1.3.36"
+  services:
+    - name: postgres:11.6
+      command: ["postgres", "-c", "fsync=off", "-c", "synchronous_commit=off", "-c", "full_page_writes=off"]
+    - name: redis:5.0-alpine
+    - name: elasticsearch:7.11.1
+      command: ["elasticsearch", "-E", "discovery.type=single-node"]
+  variables:
+    POSTGRES_HOST_AUTH_METHOD: trust
+
 .use-pg12-ee:
   image: "registry.gitlab.com/gitlab-org/gitlab-build-images:ruby-2.7.2.patched-golang-1.16-git-2.31-lfs-2.9-chrome-89-node-14.15-yarn-1.22-postgresql-12-graphicsmagick-1.3.36"
   services:

.gitlab/ci/rails.gitlab-ci.yml

@@ -58,6 +58,11 @@
     - !reference [.base-script, script]
     - rspec_paralellized_job "--tag ~quarantine --tag ~geo --tag level:migration"
 
+.rspec-base-pg11:
+  extends:
+    - .rspec-base
+    - .use-pg11
+
 .rspec-base-pg12:
   extends:
     - .rspec-base
@@ -70,6 +75,11 @@
     - .use-pg12
   needs: ["setup-test-env", "retrieve-tests-metadata", "compile-test-assets as-if-foss", "detect-tests"]
 
+.rspec-ee-base-pg11:
+  extends:
+    - .rspec-base
+    - .use-pg11-ee
+
 .rspec-ee-base-pg12:
   extends:
     - .rspec-base
@@ -81,6 +91,11 @@
     - !reference [.base-script, script]
     - rspec_paralellized_job "--tag ~quarantine --tag geo"
 
+.rspec-ee-base-geo-pg11:
+  extends:
+    - .rspec-ee-base-geo
+    - .use-pg11-ee
+
 .rspec-ee-base-geo-pg12:
   extends:
     - .rspec-ee-base-geo
@@ -277,6 +292,16 @@ rspec system pg12 minimal:
     - .minimal-rspec-tests
     - .rails:rules:ee-and-foss-system:minimal
 
+# Dedicated job to test DB library code against PG11.
+# Note that these are already tested against PG12 in the `rspec unit pg12` / `rspec-ee unit pg12` jobs.
+rspec db-library-code pg11:
+  extends:
+    - .rspec-base-pg11
+    - .rails:rules:ee-and-foss-db-library-code
+  script:
+    - !reference [.base-script, script]
+    - rspec_db_library_code
+
 rspec fast_spec_helper:
   extends:
     - .rspec-base-pg12
@@ -637,6 +662,80 @@ db:rollback geo:
 # EE: default refs (MRs, default branch, schedules) jobs #
 ##################################################
 
+##########################################
+# EE/FOSS: default branch nightly scheduled jobs #
+rspec migration pg11:
+  extends:
+    - .rspec-base-pg11
+    - .rspec-base-migration
+    - .rails:rules:default-branch-schedule-nightly--code-backstage
+    - .rspec-migration-parallel
+
+rspec unit pg11:
+  extends:
+    - .rspec-base-pg11
+    - .rails:rules:default-branch-schedule-nightly--code-backstage
+    - .rspec-unit-parallel
+
+rspec integration pg11:
+  extends:
+    - .rspec-base-pg11
+    - .rails:rules:default-branch-schedule-nightly--code-backstage
+    - .rspec-integration-parallel
+
+rspec system pg11:
+  extends:
+    - .rspec-base-pg11
+    - .rails:rules:default-branch-schedule-nightly--code-backstage
+    - .rspec-system-parallel
+# EE/FOSS: default branch nightly scheduled jobs #
+##########################################
+
+#####################################
+# EE: default branch nightly scheduled jobs #
+rspec-ee migration pg11:
+  extends:
+    - .rspec-ee-base-pg11
+    - .rspec-base-migration
+    - .rails:rules:default-branch-schedule-nightly--code-backstage-ee-only
+    - .rspec-ee-migration-parallel
+
+rspec-ee unit pg11:
+  extends:
+    - .rspec-ee-base-pg11
+    - .rails:rules:default-branch-schedule-nightly--code-backstage-ee-only
+    - .rspec-ee-unit-parallel
+
+rspec-ee integration pg11:
+  extends:
+    - .rspec-ee-base-pg11
+    - .rails:rules:default-branch-schedule-nightly--code-backstage-ee-only
+    - .rspec-ee-integration-parallel
+
+rspec-ee system pg11:
+  extends:
+    - .rspec-ee-base-pg11
+    - .rails:rules:default-branch-schedule-nightly--code-backstage-ee-only
+    - .rspec-ee-system-parallel
+
+rspec-ee unit pg11 geo:
+  extends:
+    - .rspec-ee-base-geo-pg11
+    - .rails:rules:default-branch-schedule-nightly--code-backstage-ee-only
+    - .rspec-ee-unit-geo-parallel
+
+rspec-ee integration pg11 geo:
+  extends:
+    - .rspec-ee-base-geo-pg11
+    - .rails:rules:default-branch-schedule-nightly--code-backstage-ee-only
+
+rspec-ee system pg11 geo:
+  extends:
+    - .rspec-ee-base-geo-pg11
+    - .rails:rules:default-branch-schedule-nightly--code-backstage-ee-only
+# EE: default branch nightly scheduled jobs #
+#####################################
+
 ##################################################
 # EE: Canonical MR pipelines
 rspec fail-fast:

doc/development/pipelines.md

@@ -480,7 +480,11 @@ because of 2 reasons:
 ### PostgreSQL versions testing
 
 Our test suite runs against PG12 as GitLab.com runs on PG12 and
-[Omnibus defaults to PG12 for new installs and upgrades](https://docs.gitlab.com/omnibus/package-information/postgresql_versions.html).
+[Omnibus defaults to PG12 for new installs and upgrades](https://docs.gitlab.com/omnibus/package-information/postgresql_versions.html),
+Our test suite is currently running against PG11, since GitLab.com still runs on PG11.
+
+We do run our test suite against PG11 on nightly scheduled pipelines as well as upon specific
+database library changes in MRs and `master` pipelines (with the `rspec db-library-code pg11` job).
 
 #### Current versions testing
 
@@ -498,6 +502,7 @@ We follow the [PostgreSQL versions shipped with Omnibus GitLab](https://docs.git
 | PostgreSQL version | 13.11 (April 2021)     | 13.12 (May 2021)       | 14.0 (June 2021?)      |
 | -------------------| ---------------------- | ---------------------- | ---------------------- |
 | PG12               | `nightly`              | MRs/`2-hour`/`nightly` | MRs/`2-hour`/`nightly` |
+| PG11               | MRs/`2-hour`/`nightly` | `nightly`              | `nightly`              |
 
 ### Test jobs
 
@@ -726,6 +731,8 @@ that are scoped to a single [configuration keyword](../ci/yaml/README.md#job-key
 | `.qa-cache` | Allows a job to use a default `cache` definition suitable for QA tasks. |
 | `.yarn-cache` | Allows a job to use a default `cache` definition suitable for frontend jobs that do a `yarn install`. |
 | `.assets-compile-cache` | Allows a job to use a default `cache` definition suitable for frontend jobs that compile assets. |
+| `.use-pg11` | Allows a job to run the `postgres` 11 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-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-kaniko` | Allows a job to use the `kaniko` tool to build Docker images. |