Yesterday I caught the cluster while OSD_SLOW_PING_TIME_FRONT was active:
# ceph health detail
HEALTH_WARN 4 slow ops, oldest one blocked for 9233 sec, daemons [mon.aka,mon.balin] have
slow ops.; (muted: OSD_SLOW_PING_TIME_BACK OSD_SLOW_PING_TIME_FRONT)
(MUTED, STICKY) [WRN] OSD_SLOW_PING_TIME_FRONT: Slow OSD heartbeats on front (longest
1193.125ms)
Slow OSD heartbeats on front from osd.72 [] to osd.43 [] 1193.125 msec
[WRN] SLOW_OPS: 4 slow ops, oldest one blocked for 9233 sec, daemons [mon.aka,mon.balin]
have slow ops.
I really don't understand: the warning is muted, but it shows up anyway, and moreover
with a MUTED label... and still I get warning emails.