Upgrade(v1.2.3 -> v1.3.0) failed with Helm 3

[mcavoyk]

helm version
version.BuildInfo{Version:"v3.0.2", GitCommit:"19e47ee3283ae98139d98460de796c1be1e3975f", GitTreeState:"clean", GoVersion:"go1.13.5"}

Helm upgrade failed because stateful sets cannot be patched:

Error: UPGRADE FAILED: cannot patch "harbor-database" with kind StatefulSet: StatefulSet.apps "harbor-database" is invalid: spec: Forbidden: updates to statefulset spec for fields other than 'replicas', 'template', and 'updateStrategy' are forbidden. && 
cannot patch "harbor-redis" with kind StatefulSet: StatefulSet.apps "harbor-redis" is invalid: spec: Forbidden: updates to statefulset spec for fields other than 'replicas', 'template', and 'updateStrategy' are forbidden.

Some googling leads me to believe this is related to Helm 3's three-way strategic merge patch and the immutability of spec.VolumeClaimTemplate.metadata.labels as mentioned in this issue helm/charts#7803

[mcavoyk]

Looks like this is specific to Helm releases which were migrated with the helm 2to3 plugin. The heritage label on the VolumeClaimTemplate in statefulsets changed from Tiller -> Helm, helm/charts#19231.

I manually worked around this issue by pulling the chart locally and changing the heritage label back to Tiller, maybe Helm will have a better solution for this in the future but it doesn't seem like this is a problem with the Harbor chart specifically.