It does look like this warning shows up when the MDS is behind trimming (which also shows up in cluster logs and `ceph status'). Looking into this now...
The MDS seems to be not trimming client completed requests. For client.10472234, `completed_requests' is 434149 which is exceeding a threashold thereby generating this warning. I cannot find any MDS log in the sosreport. Could someone point me at it? Also, it would help if mds debug logs (debug_mds = 20 and let capture it for ~5-10 minutes) can be captured and shared. And reset the log level once the logs have been captured.
It looks like the customer still hasn't prevented the SELinux relabeling from occurring, right? That's still a good guess for what may be causing issues. But if not, the other thing we can have them do is get manager logs of the embedded CephFS client (debug_client = 20, debug_ms = 10), and mds logs (debug mds = 20, debug ms = 10), when this incident is happening. (I'm not sure how to get that through OpenShift/Rook). They will be large and this may be intrusive, so we should give Venky a chance to find out more, and see if things improve when they turn off the SELinux relabeling. But at least it sounds like it reliably occurs whenever the manager fails over.