[Observium] how can i alert when link is up but eigrp peer (next hop) is down

hi, I am hoping someone can give me some suggestions on how to alert when my Cisco router's interface is up/up but the other side is not responding. I just discovered that I have been running on a backup line for a while at one site and did not know it because the primary link did not go "down"

is there anything I can do with monitoring eigrp peers etc. It did occur to me that if I set up an sla on the router, I might be able to leverage that, but I would like a solution that did not involve more config on the router.

thanks in advance