Unable to resize/upscale Thamos storage via Observatorium CR

[tumido]

Updating Observatorium CR at .spec.receivers.volumeClaimTemplate.spec.resources.requests.storage

apiVersion: core.observatorium.io/v1alpha1
kind: Observatorium
metadata:
  ....
spec:
  ...
  receivers:
    ...
    volumeClaimTemplate:
      spec:
        ...
        resources:
          requests:
-            storage: 10Gi
+            storage: 50Gi

results in error:

* failed to execute action (CreateOrUpdate): StatefulSet.apps "opf-observatorium-thanos-receive-default" is invalid: spec: Forbidden: updates to statefulset spec for fields other than 'replicas', 'template', and 'updateStrategy' are forbidden

Is there any other way how we can scale the Thanos PVC storage via Observatorium?

Current workaround

Modify the PVC directly

Desired solution

Update PVC directly via the Observatorium resource

Additional context

operate-first/apps#380

[4n4nd]

Current workaround is to

1. Delete the statefulset
2. Delete the operator pod, force it to reconcile