There were two devices in the DA. An older SNMP managed device and a newer unreconciled SDN device. Both had SDN MFs associated.
Only the newer unreconciled SDN device had the correct facets to represent those MFs.
The older SNMP device item of the pairs we found in the DA did have SDN MFs listed in the Polled Metric Families tab. But they weren't really applied and the device wasn't listed in DA:8581/rest/sdns.
Currently observed in r20.2.5 Performance Management and VNA environment from the Cisco Viptela plugin
Pending updates from engineering per defect DE488401