The output of "ceph df detail" has a lot of useful information including per pool stats that should be documented.
--- RAW STORAGE ---
CLASS SIZE AVAIL USED RAW USED %RAW USED
ssd 303 GiB 300 GiB 3.0 GiB 3.0 GiB 0.99
TOTAL 303 GiB 300 GiB 3.0 GiB 3.0 GiB 0.99
--- POOLS ---
POOL ID PGS STORED (DATA) (OMAP) OBJECTS USED (DATA) (OMAP) %USED MAX AVAIL QUOTA OBJECTS QUOTA BYTES DIRTY USED COMPR UNDER COMPR
device_health_metrics 1 1 0 B 0 B 0 B 1 0 B 0 B 0 B 0 99 GiB N/A N/A 1 0 B 0 B