Made volumeName optional and added it to values.yaml with comment-based documentation

Signed-off-by: hyukjun <[email protected]>

Author: hyukjuns

charts/grafana/templates/statefulset.yaml

@@ -46,7 +46,9 @@ spec:
     spec:
       accessModes: {{ .Values.persistence.accessModes }}
       storageClassName: {{ .Values.persistence.storageClassName }}
-      volumeName: {{ .Values.persistence.volumeName | quote }}
+      {{- with .Values.persistence.volumeName }}
+      volumeName: {{ . | quote }}
+      {{- end }}
       resources:
         requests:
           storage: {{ .Values.persistence.size }}

charts/grafana/values.yaml

@@ -416,6 +416,8 @@ persistence:
   type: pvc
   enabled: false
   # storageClassName: default
+  ## (Optional) Use this to bind the claim to an existing PersistentVolume (PV) by name.
+  volumeName: ""
   accessModes:
     - ReadWriteOnce
   size: 10Gi