// code placeholder
% oc -n openshift-observability-operator get monitoringstack sample-mon-stack -oyaml
apiVersion: monitoring.rhobs/v1alpha1
kind: MonitoringStack
metadata:
  labels:
    mso: example
  name: sample-mon-stack
  namespace: openshift-observability-operator
spec:
  alertmanagerConfig:
    disabled: false
  logLevel: debug
  prometheusConfig:
    persistentVolumeClaim:
      resources:
        requests:
          storage: 2Gi
      storageClassName: gp3-csi
      volumeMode: Filesystem
    replicas: 2
  resourceSelector:
    matchLabels:
      app: demo
  resources:
    limits:
      cpu: 500m
      memory: 512Mi
    requests:
      cpu: 100m
      memory: 256Mi
  retention: 1d

% oc -n openshift-observability-operator get sts prometheus-sample-mon-stack -ojsonpath='{.spec.volumeClaimTemplates}'|jq
[
  {
    "apiVersion": "v1",
    "kind": "PersistentVolumeClaim",
    "metadata": {
      "creationTimestamp": null,
      "name": "prometheus-sample-mon-stack-db"
    },
    "spec": {
      "accessModes": [
        "ReadWriteOnce"
      ],
      "resources": {
        "requests": {
          "storage": "2Gi"
        }
      },
      "storageClassName": "gp3-csi",
      "volumeMode": "Filesystem"
    },
    "status": {
      "phase": "Pending"
    }
  }
]

% oc -n openshift-observability-operator get pvc                                                                         
NAME                                                           STATUS    VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
prometheus-sample-mon-stack-db-prometheus-sample-mon-stack-0   Bound     pvc-0af31373-11c4-48ff-a4ed-11e4b493986b   2Gi        RWO            gp3-csi        15m
prometheus-sample-mon-stack-db-prometheus-sample-mon-stack-1   Bound     pvc-8260645c-74e9-406a-8350-1f588c879abc   2Gi        RWO            gp3-csi        15m 

% oc -n openshift-observability-operator get pv|grep mon 
pvc-0af31373-11c4-48ff-a4ed-11e4b493986b   2Gi        RWO            Delete           Bound    openshift-observability-operator/prometheus-sample-mon-stack-db-prometheus-sample-mon-stack-0   gp3-csi                 15m
pvc-8260645c-74e9-406a-8350-1f588c879abc   2Gi        RWO            Delete           Bound    openshift-observability-operator/prometheus-sample-mon-stack-db-prometheus-sample-mon-stack-1   gp3-csi                 15m