You can delete a namespace that does not contain any objects.
If a namespace is being replicated, you may not be able to delete it directly on all the HCP systems in the replication topology. However, if you delete it on one system, the deletion is replicated to the other systems.
Important: If the namespace you want to delete is being replicated, do not clear it from replication before deleting it. If you clear it first, the deletion is not replicated and the namespace remains on the other systems where it was replicated. Depending on the replication topology, you may not be able to delete the namespace on one or more of those other systems.
When a namespace is deleted, the chargeback statistics for it become unavailable. Therefore, before deleting a namespace for which you need these statistics, generate a chargeback report.