Thanks, Greg.  Suggestions for remediation?

> 
> The MDS/client created the snapshotted data, but deleting a snapshot is
> just a metadata update: it tells the monitor “please delete snapshot ID
> 1234”, and the monitor puts 1234 in the osdmap as a snapshot to be deleted.
> Then the OSDs do that work asynchronously and outside of cephfs’
> supervision.
> So, that must have happened, and there was this bug in RADOS that meant the
> snapshot didn’t actually get (fully) trimmed.
> -Greg
> 
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