$ sudo ceph daemon osd.{id} perf dump
...
     "tier_promote": 1425,
     "tier_flush": 0,
     "tier_flush_fail": 0,
     "tier_try_flush": 216,
     "tier_try_flush_fail": 21,
     "tier_evict": 1413,
     "tier_whiteout": 201,
     "tier_dirty": 671,
     "tier_clean": 216,
     "tier_delay": 16,
...