Helm chart does not generate volumeSnapshot configuration

[vi-malii]

I noticed that the Helm values mention that the backup method can be either barmanObjectStore (default) or volumeSnapshot:

Backup method, can be barmanObjectStore (default) or volumeSnapshot
https://github.com/cloudnative-pg/charts/blob/cluster-v0.6.1/charts/cluster/values.yaml#L489

However, I couldn't find any references to volumeSnapshot in the chart templates. I expect the following configuration to generate the corresponding resources:

- name: vs-daily
  schedule: "0 0 2 * * *"
  backupOwnerReference: self
  method: volumeSnapshot

Instead: no volumeSnapshot section defined on the target cluster

Which makes sense, since there doesn't seem to be any volumeSnapshot configuration generated by the chart.

Am I missing some additional required configuration, or is volumeSnapshot support currently incomplete/outdated in the Helm chart documentation?

Thanks.

[dosubot]

You're not missing anything — this is a known gap in the chart. The values.yaml documents volumeSnapshot as a valid backup method [1], and the ScheduledBackup resource will be created with method: volumeSnapshot if you set it, but the chart's backup template (_backup.tpl) only generates barmanObjectStore configuration [2]. There's no templating logic to produce the spec.backup.volumeSnapshot section on the Cluster resource that CloudNativePG needs.

In short: the scheduled backup will reference volumeSnapshot, but the Cluster itself won't have the corresponding volumeSnapshot config rendered by the chart.

As a workaround, you'd need to manually patch the Cluster resource (e.g., via Kustomize post-rendering or a raw override) to add the volumeSnapshot section. There's also an active PR #838 that touches backup method handling as part of plugin support, though it's been pending for a while.

To reply, just mention @dosu.

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