We have devices that have multiple VRF's configured, however the current BGP peer session functionality in spectrum only monitors the peer sessions that are returned by the "default" VRF. It does not poll/see the peer session related to other VRF's. Devices are running SNMPv3 and have context configured. If you snmpwalk the BGP4 mib using the specific snmp context, for each VRF, data is returned.
Spectrum should support the polling of SNMP contexts to monitor all BGP peer-sessions on a device