We use Gitlab CE .
By default it is only possible to have on active integration as issue tracker. We used to have Redmine as issue tracker. Now we have Jira as issue tracker. Usually Gitlab allows only one active issue tracker. Somehow due to updates some projects are now in a state that we have two active issue trackers, Jira and Redmine. In each tracker the checkbox to disable the issue tracker is checked and disabled. And each integration shows a messages " Another issue tracker is already in use. Only one issue tracker integration can be active at a time. Please disable the active tracker first and try again."
So it seems that it is not possible to disable the old Redmine integation via GUI. Is there a way to disable the integration via cli?