mgr/dashboard: Enable RBD performance monitoring on selected pools
Since Ceph Nautilus, it is possible to enable RBD image metrics to obtain per-RBD performance metrics via the Prometheus module.
It should be possible to enable these IO statistics via the Ceph Pool page, by clicking on a selected pool (that has the "rbd" application label attached to it) and confirming a dialogue, e.g. via a checkbox:
Collect RBD per-image IO statistics [X]
Note that this metrics collection can also limited to a specific namespace of the pool, so it should also be possible to enable this on a namespace level.