Allow statefulSet updates (helm#8527)

* CouchDB - Allow statefulSet updates

This fixes CouchDB updates by removing Version part from StatefulSet lables, as Kubernetes don't allow updates to any other fields but 'replicas', 'template', and 'updateStrategy', and therefore updating CouchDB service would be impossible.
- metadata.labels
- spec.VolumeClaimTemplate.metadata.labels

Signed-off-by: Stepan Stipl <stepan@stipl.net>

* CouchDB - bump chart version to 0.3.0

Signed-off-by: Stepan Stipl <stepan@stipl.net>

* CouchDB - Update StatefulSet labels

Signed-off-by: Stepan Stipl <stepan@stipl.net>

* Bump major version and describe upgrade process

Signed-off-by: Stepan Stipl <stepan@stipl.net>
Signed-off-by: Chaoran Yu <yuchaoran2011@gmail.com>

incubator/couchdb/Chart.yaml

@@ -1,5 +1,5 @@
 name: couchdb
-version: 0.2.2
+version: 1.0.0
 appVersion: 2.2.0
 description: A database featuring seamless multi-master sync, that scales from
   big data to mobile, with an intuitive HTTP/JSON API and designed for

incubator/couchdb/README.md

@@ -67,6 +67,23 @@ $ helm delete my-release
 The command removes all the Kubernetes components associated with the chart and
 deletes the release.
 
+## Upgrading an existing Release to a new major version
+
+A major chart version change (like v0.2.3 -> v1.0.0) indicates that there is an
+incompatible breaking change needing manual actions.
+
+### 1.0.0
+
+This version removes the `chart` and `heritage` labels from the
+`volumeClaimTemplates` which is immutable and prevents chart from being upgraded
+(see https://github.com/helm/charts/issues/7803 for details).
+
+In order to upgrade, delete the CouchDB StatefulSet before upgrading:
+
+```bash
+$ kubectl delete statefulsets --cascade=false my-release-couchdb
+```
+
 ## Configuration
 
 The following table lists the most commonly configured parameters of the

incubator/couchdb/templates/statefulset.yaml

@@ -133,9 +133,7 @@ spec:
         name: database-storage
         labels:
           app: {{ template "couchdb.name" . }}
-          chart: {{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}
           release: {{ .Release.Name }}
-          heritage: {{ .Release.Service }}
       spec:
         accessModes:
         {{- range .Values.persistentVolume.accessModes }}