Introduced in GitLab 8.7. It is OFF by default because it still causes too many false alarms.
Git has a built-in mechanism, git fsck, to verify the integrity of all data committed to a repository. GitLab administrators can trigger such a check for a project via the project page under the admin panel. The checks run asynchronously so it may take a few minutes before the check result is visible on the project admin page. If the checks failed you can see their output on the admin log page under 'repocheck.log'.
When enabled, GitLab periodically runs a repository check on all project
repositories and wiki repositories in order to detect data corruption.
A project will be checked no more than once per month. If any projects
fail their repository checks all GitLab administrators will receive an email
notification of the situation. This notification is sent out once a week,
by default, midnight at the start of Sunday. Repositories with known check
failures can be found at
Disabling periodic checks
You can disable the periodic checks on the 'Settings' page of the admin panel.
What to do if a check failed
If the repository check fails for some repository you should look up the error
- in the admin panel
- or on disk, see:
/var/log/gitlab/gitlab-railsfor Omnibus installations
/home/git/gitlab/logfor installations from source
If for some reason the periodic repository check caused a lot of false
alarms you can choose to clear all repository check states by
clicking "Clear all repository checks" on the Settings page of the
admin panel (