Uninstall
The cortex cluster-gcp down command doesn't wait for the cluster to spin down. You can ensure that the cluster has spun down by checking the GKE console.
Delete Prometheus Volume
The volume used by Cortex's Prometheus instance is not deleted by default, as it might contain important information. If this volume is not required anymore, you can delete it in the GCP console. Navigate to the Disks page (be sure to set the appropriate project), select the volume, and click "Delete". A Prometheus volume that Cortex created has a name that starts with gke-<cluster name>-, and the kubernetes.io/created-for/pvc/name tag starts with prometheus-.
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