CephFS warning: clients laggy due to laggy OSDs

[Janek Bevendorff <janek.bevendorff@xxxxxxxxxxxxx>]

Hey all,

Since the upgrade to Ceph 16.2.14, I keep seeing the following warning:

10 client(s) laggy due to laggy OSDs

ceph health detail shows it as:

[WRN] MDS_CLIENTS_LAGGY: 10 client(s) laggy due to laggy OSDs
    mds.***(mds.3): Client *** is laggy; not evicted because some 
OSD(s) is/are laggy
    more of this...

When I restart the client(s) or the affected MDS daemons, the message 
goes away and then comes back after a while. ceph osd perf does not list 
any laggy OSDs (a few with 10-60ms ping, but overwhelmingly < 1ms), so 
I'm on a total loss what this even means.

I have never seen this message before nor was I able to find anything 
about it. Do you have any idea what this message actually means and how 
I can get rid of it?

Thanks
Janek

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