GCS WAL backup config per cluster

Please, answer some short questions which should help us to understand your problem / question better?

• Which image of the operator are you using? registry.opensource.zalan.do/acid/postgres-operator:v1.9.0
• Where do you run it - cloud or metal? Kubernetes or OpenShift? GKE
• Are you running Postgres Operator in production? yes
• Type of issue? Question

The Postgres Operator documentation lists two ways to configure GCS access for WAL backups. However, both are global configurations at the operator level.

Is there a way to configure the WALG_GS_PREFIX (and possibly the service account or key.json) at postgres cluster level?

We previously backed up to MinIO using the Postgres S3 config. Here, I was able to set the bucket at cluster level by defining the WAL_S3_BUCKET env variable. Similarly setting WALG_GS_PREFIX in the postgres resource does not seem to work.

Start with the administrator documentation section on Google Cloud Platform setup and inspect how the postgres resource handles WAL_S3_BUCKET. Compare that path with WALG_GS_PREFIX and the service-account or key.json settings. Done means determining whether cluster-level GCS WAL backup configuration is supported and documenting or implementing the required behavior.