hi,
we were able to track this down to the auto balancer: disabling the auto
balancer and cleaning out old (and probably not very meaningful)
upmap-entries via ceph osd rm-pg-upmap-items brought back stable mgr
daemons and an usable dashboard.
the not-so-sensible upmap-entries might or might not have been caused by
us updating from mimic to nautilus - it's too late to debug this now.
this seems to be consistent with bryan stillwell's findings ("mgr hangs
with upmap balancer").
thank you very much & with kind regards,
thoralf.
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