https://docs.ceph.com/en/reef/rados/configuration/mclock-config-ref/
* CEPHFS: After recovering a Ceph File System post following the disaster recovery
procedure, the recovered files under `lost+found` directory can now be deleted.
+ https://docs.ceph.com/en/latest/rados/configuration/mclock-config-ref/
+* mgr/snap_schedule: The snap-schedule mgr module now retains one less snapshot
+ than the number mentioned against the config tunable `mds_max_snaps_per_dir`
+ so that a new snapshot can be created and retained during the next schedule
+ run.
>=17.2.1