Introduced in GitSwarm 2016.2. 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. GitSwarm 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'.
GitSwarm periodically runs a repository check on all project repositories and wiki repositories in order to detect data corruption problems. A project will be checked no more than once per week. If any projects fail their repository checks all GitSwarm administrators will receive an email notification of the situation. This notification is sent out no more than once a day.
You can disable the periodic checks on the 'Settings' page of the admin panel.
If the repository check fails for some repository you should look up the error in repocheck.log (in the admin panel or on disk; see /var/log/gitswarm/gitlab-rails for package installations or /home/git/gitlab/log for source installations). Once you have resolved the issue use the admin panel to trigger a new repository check on the project. This will clear the 'check failed' state.
If for some reason the periodic repository check caused a lot of false alarms you can choose to clear ALL repository check states from the 'Settings' page of the admin panel.