Is there more information on "performance reasons" [0]? Elsewhere in the documentation [1] it even states:
Monitoring of RBD images is disabled by default, as it can significantly impact performance.
We want to use this in production to hopefully help with debugging a rare nightly latency issue. Obviously, we don't want to introduce new performance issues. Does anyone have experience with enabling RBD per-image I/O statistics [2] in production? Did it cause you any performance (or other) issues? Mika [0] https://docs.ceph.com/en/latest/cephadm/services/monitoring/#setting-up-rbd-... [1] https://docs.ceph.com/en/latest/mgr/dashboard/#enabling-rbd-image-monitoring [2] https://docs.ceph.com/en/latest/mgr/prometheus/#rbd-io-statistics