Cisco claims that to be able to poll multiple VRFs, you need to associate each VRF with a context, then poll that context. At least they're saying that for the Nexus 7K I'm currently working on. Orion appears to have the ability to support multiple VRF's on a device just fine, but getting good results seems inconsistent from Cisco boxes at least.
Currently Orion only has a single box for putting in a single context. It would be great if you could have Orion poll multiple SNMP contexts on the same device to get all the VRF's on a box.
I'll provide more context in a discussion that I'll refer to in a reply here.