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Tacker: how to scale out/in based on CP metrics?

Tosca samples show how to scale based on ceilometer metrics applied to VDUs, for example CPU: https://github.com/openstack/tacker/blob/master/samples/tosca-templates/vnfd/tosca-vnfd-alarm-scale.yaml

But if I want to use an interface-level metric, for example "network.outgoing.bytes.rate", how to narrow the alarm to a specific interface (CP/VL) and not all VDU interfaces?

Thanks.