6.2.

apiVersion: v1
kind: ConfigMap
metadata:
  name: cluster-monitoring-config
  namespace: openshift-monitoring
data:
  config.yaml: |
      prometheusK8s:
        retention: <time to retain monitoring files, e.g. 24h>
        volumeClaimTemplate:
          metadata:
            name: ocs-prometheus-claim
          spec:
            storageClassName: ocs-storagecluster-ceph-rbd
            resources:
              requests:
                storage: <size of claim, e.g. 40Gi>
      alertmanagerMain:
        volumeClaimTemplate:
          metadata:
            name: ocs-alertmanager-claim
          spec:
            storageClassName: ocs-storagecluster-ceph-rbd
            resources:
              requests:
                storage: <size of claim, e.g. 40Gi>