Merge branch '32851-postgres-min-version' into 'master'

Drop support for postgresql 9.1 in GitLab 9.3

Closes #32851

See merge request !11677

.gitlab-ci.yml

@@ -52,7 +52,7 @@ stages:
 
 .use-pg: &use-pg
   services:
-    - postgres:9.1
+    - postgres:9.2
     - redis:alpine
 
 .use-mysql: &use-mysql

changelogs/unreleased/32851-postgres-min-version.yml

+---
+title: Minimum postgresql version is now 9.2
+merge_request: 11677
+author:

doc/install/database_mysql.md

@@ -281,5 +281,5 @@ GitLab database to `longtext` columns, which can persist values of up to 4GB
 Details can be found in the [PostgreSQL][postgres-text-type] and
 [MySQL][mysql-text-types] manuals.
 
-[postgres-text-type]: http://www.postgresql.org/docs/9.1/static/datatype-character.html
+[postgres-text-type]: http://www.postgresql.org/docs/9.2/static/datatype-character.html
 [mysql-text-types]: http://dev.mysql.com/doc/refman/5.7/en/string-type-overview.html

doc/install/installation.md

@@ -185,7 +185,8 @@ Create a `git` user for GitLab:
 We recommend using a PostgreSQL database. For MySQL check the
 [MySQL setup guide](database_mysql.md).
 
-> **Note**: because we need to make use of extensions you need at least pgsql 9.1.
+> **Note**: because we need to make use of extensions and concurrent index removal,
+you need at least PostgreSQL 9.2.
 
 1. Install the database packages: