OpenShift Console uses OpenShift Prometheus for monitoring and populating data in Storage Dashboard. Additional configuration is required to monitor the Ceph Cluster from the storage dashboard.
Change the namespace of the RoleBinding `rook-ceph-metrics` from `rook-ceph` to `openshift-monitoring` for the `prometheus-k8s` ServiceAccount in [rbac.yaml](https://github.com/rook/rook/blob/master/cluster/examples/kubernetes/ceph/monitoring/rbac.yaml#L70).