Backup fails without `target: primary` - "unable to find primary cluster"

[gliatti]

Hello,

I have created a cluster with 2 instances and the plugin and executed the following backup:

---
apiVersion: postgresql.cnpg.io/v1
kind: ScheduledBackup
metadata:
  name: pg16-pgbackrest-daily-backup
  namespace: postgres
spec:
  schedule: "0 3 * * *"
  backupOwnerReference: self
  cluster:
    name: pg16-pgbackrest
  method: plugin
#  target: primary
  pluginConfiguration:
    name: pgbackrest.dalibo.com

When I don't use target: primary I have the following error: unable to find primary cluster.
Using it fixes the backup.

• CNPG: 1.27.0
• Plugin: latest
• kind v0.30.0 go1.24.6 linux/amd64

Robin,