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

Issue

• 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
  

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