we are really struggeling to monitor the FEX uplinks on Cisco Nexus 5k and 7k in in Spectrum.
So an uplink to a FEX is seen as normal interface and not as virtual backplane extention.
So the only sollution currently is to model a Fan out for every FEX, witch relay doesn´t suite our environment.
Its really easy to monitor this on the Switch itself, so why not in spectrum
Fabric interface state:
Po149 - Interface Up. State: Active
Eth3/46 - Interface Up. State: Active
Eth4/46 - Interface Up. State: Active