Ceph

pg <pgid> query shows 0 for the four stats

num_objects_missing_on_primary
num_object_copies
num_objects_unfound
num_objects_degraded

Unfortunately, these are some of the more important items in pg query output when diagnosing problem pgs.

The problem doesn't affect pg dump_stuck, I believe because dump_stuck searches
PGMap and finds PGs in a particular state, then gets the stats from PGMap::pg_stat.
pg <pgid> query, on the other hand, starts from PG::info.stats, which is not
kept up to date.

Sage suggests updating info.stats on the query command, if I understand correctly.