If ceph is having a temporarily problem – e.g. a node goes down – it may happen, that you see constanctly a waring in the Web UI or also if you run
$ ceph status
In case the message is
.. daemons have recently crashed
but your ceph is up an running again and you can not see any more concerning messages you can remove the messages the force this kind of status. To do this you can run the following form your ceph console:
ceph crash ls # lists all crash message ceph crash archive-all # moves the messages into the archive
This will bring back the health status to HEALTH_OK.