[stable/graylog] Fix #20306, add helm2Compatibility flag to `values…

….yaml` that preserves specific labels installed by helm2 for backward compatibility. (#20464)

Signed-off-by: juliohm1978 <jhm@juliohm.com.br>

stable/graylog/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v1
 name: graylog
 home: https://www.graylog.org
-version: 1.5.2
+version: 1.5.3
 appVersion: 3.1
 description: Graylog is the centralized log management solution built to open standards for capturing, storing, and enabling real-time analysis of terabytes of machine data.
 keywords:

stable/graylog/templates/statefulset.yaml

@@ -15,15 +15,23 @@ spec:
     matchLabels:
       app.kubernetes.io/name: {{ template "graylog.name" . }}
       app.kubernetes.io/instance: "{{ .Release.Name }}"
+      {{- if .Values.helm2Compatibility }}
+      app.kubernetes.io/managed-by: "Tiller"
+      {{- else }}
       app.kubernetes.io/managed-by: "{{ .Release.Service }}"
+      {{- end }}
   updateStrategy:
     type: {{ .Values.graylog.updateStrategy }}
   template:
     metadata:
       labels:
         app.kubernetes.io/name: {{ template "graylog.name" . }}
         helm.sh/chart: {{ template "graylog.chart" . }}
+        {{- if .Values.helm2Compatibility }}
+        app.kubernetes.io/managed-by: "Tiller"
+        {{- else }}
         app.kubernetes.io/managed-by: "{{ .Release.Service }}"
+        {{- end }}
         app.kubernetes.io/instance: "{{ .Release.Name }}"
         app.kubernetes.io/version: "{{ .Chart.AppVersion }}"
       annotations:

stable/graylog/values.yaml

@@ -22,6 +22,16 @@ tags:
   # If true, this chart will install MongoDB replicaset from requirement dependencies
   install-mongodb: true
 
+## Enable only if your current release was migrated from helm2 (using 2to3 plugin).
+##
+## Because Kubernetes considers some StatefulSets fields/labels immutable,
+## this flag preserves the values rendered by helm2. This allows helm3
+## to upgrade the current release without a complete purge/reinstall.
+##
+## Further details: https://github.com/helm/charts/issues/20306
+##
+# helm2Compatibility: true
+
 graylog:
   ## Graylog image version
   ## Ref: http://kubernetes.io/docs/user-guide/images/#pre-pulling-images