[ceph-users] What are mon.<hostname>-safe containers?

Hi, When I run `ceph orch ps` I see a couple of containers running on our MON nodes whose names end with the `-safe` suffix, and I was wondering what they are? I couldn't find information about it in https://docs.ceph.com This cluster is running Ceph 15.2.5, recently upgraded from 15.2.4 Many thanks, Sebastian