If you’re trying to delete an interface via Visual KPI Server Manager, you may get a message that looks like this:
Interface [interface name] is referenced and cannot be deleted.
Visual KPI will not allow you to delete an interface when you have associated data. Remove all references to the interface, such as KPIs, Charts, and Trends. Then you can delete the interface via Visual KPI Server Manager.
Learn more
Configure Visual KPI Sites and Interfaces