some pg_created messages not sent to mon
mon doesn't get pg_created for two pgs. CREATING flag is never removed, job fails with a final scrub timeout
osd sends them to mon, but a msgr reconnect drops them. there is no retry.
2018-12-29 17:47:31.080 7f949c7a8700 1 -- 172.21.15.110:6812/10945 --> 172.21.15.110:6790/0 -- osd_pg_created(1.0) v1 -- 0x55ecc3c00e00 con 0
- if pool CREATING flag is sent, we queue a 'created' message when the pg peers
- osd tracks pending created messages, resends on mon reset
- prune pgs from the list when the pool flag is cleared
this will easily mean resending some of these if it takes a while for the pool's pgs to be created, but the messages are cheap and harmless.