chronograf: do not remove pvc when uninstalling chart (#235)

charts/chronograf/Chart.yaml

 apiVersion: v1
 name: chronograf
-version: 1.1.21
-appVersion: 1.8.8
+version: 1.1.22
+appVersion: 1.8.9.1
 description: Open-source web application written in Go and React.js that provides
   the tools to visualize your monitoring data and easily create alerting and automation
   rules.

charts/chronograf/templates/pvc.yaml

@@ -8,6 +8,10 @@ metadata:
     chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
     release: "{{ .Release.Name }}"
     heritage: "{{ .Release.Service }}"
+  annotations:
+ {{- if (eq "true" .Values.persistence.keepPvc) }}
+    "helm.sh/resource-policy": keep
+ {{- end }}
 spec:
   accessModes:
   - {{ .Values.persistence.accessMode | quote }}

charts/chronograf/values.yaml

@@ -24,8 +24,9 @@ persistence:
   ## If undefined (the default) or set to null, no storageClassName spec is
   ##   set, choosing the default provisioner.  (gp2 on AWS, standard on
   ##   GKE, AWS & OpenStack)
-  ##
   # storageClass: "-"
+  ## If keepPvc is true, pvc will not be deleted after running helm uninstall
+  # keepPvc:
   accessMode: ReadWriteOnce
   size: 8Gi