After you delete a Container Service for Kubernetes (ACK) cluster, you may notice the following symptoms in the region where the cluster existed:
In the Managed Service for Prometheus console, some clusters appear dimmed.
You cannot create a new ACK cluster with the same name as the deleted cluster.
These symptoms occur because the Prometheus agent has its own lifecycle, independent of the ACK cluster. Deleting the cluster does not automatically remove the agent or release the associated cluster name.
Solution
To resolve this issue, uninstall the orphaned Prometheus agent:
Go to the Managed Service for Prometheus console.
Find the dimmed cluster entry and uninstall the Prometheus agent. For detailed steps, see Uninstall the Prometheus agent.
After the agent is uninstalled:
The dimmed clusters are removed from the console.
The cluster name becomes available for reuse.