Introduced in GitLab Premium 12.8.
Merge request approvals rules prevent users overriding certain settings on a project level. When configured, only administrators can change these settings on a project level if they are enabled at an instance level.
To enable merge request approval rules for an instance:
- Navigate to Admin Area > Push Rules and expand Merge requests approvals.
- Set the required rule.
- Click Save changes.
GitLab administrators can later override these settings in a project’s settings.
Merge request approval rules that can be set at an instance level are:
- Prevent approval of merge requests by merge request author. Prevents project maintainers from allowing request authors to merge their own merge requests.
- Prevent approval of merge requests by merge request committers. Prevents project maintainers from allowing users to approve merge requests if they have submitted any commits to the source branch.
- Prevent users from modifying merge request approvers list. Prevents project maintainers from allowing users to modify the approvers list in project settings or in individual merge requests.