Ceph/ODF: alertname = MDSCacheUsageHigh: MDS cache usage for the daemon mds.ocs-storagecluster-cephfilesystem-X has exceeded above 95% of the requested value.

Issue

alertname = "MDSCacheUsageHigh": MDS cache usage for the daemon mds.ocs-storagecluster-cephfilesystem-X has exceeded above 95% of the requested value.

The above alert is "firing" in our Openshift Clusters. Here is the full text of the alert:

Labels
alertname = MDSCacheUsageHigh
ceph_daemon = mds.ocs-storagecluster-cephfilesystem-a
endpoint = ceph-exporter-http-metrics
instance = 10.131.2.24:9926
job = kube-state-metrics
managedBy = ocs-storagecluster
namespace = openshift-storage
openshift_io_alert_source = platform
pod = rook-ceph-exporter-oirnocp0088-595878d8c-gdgpv
prometheus = openshift-monitoring/k8s
service = rook-ceph-exporter
severity = critical

Annotations
description = MDS cache usage for the daemon mds.ocs-storagecluster-cephfilesystem-a has exceeded above 95% of the requested value. Increase the memory request for mds.ocs-storagecluster-cephfilesystem-a pod.
message = High MDS cache usage for the daemon mds.ocs-storagecluster-cephfilesystem-a.
runbook_url = https://github.com/openshift/runbooks/blob/master/alerts/openshift-container-storage-operator/CephMdsCacheUsageHigh.md
severity_level = error