How to delete dangling PVC

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We had a namespace in which there were some PVCs. One of the PVCs had used 90% of it storage and we got alerts from OpenShift.
This was a test namespace, we uninstalled the applications there and deleted the namespace.
However, we still get alerts for the PVC.
How can we correct this?
Is there a dangling reference somewhere?
Since we deleted the namespace, we cannot see PVCs inside it.
PVC name was data-kafkatest-cluster-kafka-0.

AlertManager:
[FIRING:1] kafka (PersistentVolumeUsageCritical https-metrics kubelet /metrics data-kafkatest-cluster-kafka-0 openshift-monitoring/k8s openshift-storage.cephfs.csi.ceph.com kubelet critical ocs-storagecluster-cephfs)

KD

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