Chapter 5. Ceph metrics for Datadog

The Datadog agent collects the following metrics from Ceph. These metrics may be included in custom dashboards and in alerts.

Metric Name	Description
`ceph.commit_latency_ms`	The time taken to commit an operation to the journal.
`ceph.apply_latency_ms`	Time taken to flush an update to disks.
`ceph.op_per_sec`	The number of I/O operations per second for given pool.
`ceph.read_bytes_sec`	The bytes per second being read.
`ceph.write_bytes_sec`	The bytes per second being written.
`ceph.num_osds`	The number of known storage daemons.
`ceph.num_in_osds`	The number of participating storage daemons.
`ceph.num_up_osds`	The number of online storage daemons.
`ceph.num_pgs`	The number of placement groups available.
`ceph.num_mons`	The number of monitor daemons.
`ceph.aggregate_pct_used`	The overall capacity usage metric.
`ceph.total_objects`	The object count from the underlying object store.
`ceph.num_objects`	The object count for a given pool.
`ceph.read_bytes`	The per-pool read bytes.
`ceph.write_bytes`	The per-pool write bytes.
`ceph.num_pools`	The number of pools.
`ceph.pgstate.active_clean`	The number of `active+clean` placement groups.
`ceph.read_op_per_sec`	The per-pool read operations per second.
`ceph.write_op_per_sec`	The per-pool write operations per second.
`ceph.num_near_full_osds`	The number of nearly full OSDs.
`ceph.num_full_osds`	The number of full OSDs.
`ceph.osd.pct_used`	The percentage used of full or near-full OSDs.