SNMP OID to poll to determine if a LAG member is down?

I'm trying to figure out how I would determine via SNMP polling that an LACP member port is down?

I want to use Prometheus to poll a device and get a metric back that would tell me when an LACP bundle member is down/not functioning properly.

I've looked through various MIBs, but I can't seem to find something (Cisco & Juniper) that would tell me the Operational Status of LACP bundle members