GitLab test instance gitlab-prod-1001.devtools.eqiad1.wikimedia.cloud is running buster. It should be upgraded to bullseye to make it similar with production.
Things to consider:
- This is the last host running gitlab on buster, so after that apt config for gitlab-ce can be cleaned up
- we got some help from @taavi to setup the 2nd IP properly in T297411, we will need a similar configuration here
- steps needed to bootstrap a new test instance are described in T302976 / https://wikitech.wikimedia.org/wiki/GitLab/Test_Instance#Setup_new_test_instances