On our test instance, for the first time, after an Indico restart, I saw the error that celery is not working. It seems to remain a permanent error. Looking in the log files I saw that celery seems to be working fine but found in indico.log a warning
Task heartbeat is locked; not executing it. To manually unlock it, run indico celery unlock heartbeat`. I didt it but the problem remains reported on the web interface, despite the error doesn’t seem to be in indico.log anymore…
Where I could find information about the reason for this problem?