Cisco EIGRP Peer alarm(s) not being supressed?

That is my understanding too, LM has server-side logic to declare a device dead after 6 minutes (but Host Status will alert after 5min), so any alerts that occur before those 6 minutes will cause notifications.

PeerDown is using the un() function so it's specifically looking if it's NaN or not. I don't know how this particular DataSource or Cisco EIGRP works so I'm not clear if upTime can tell the difference between peer down or switch down, there might be a trick to do so. But in a more generic solution and since this is a script based DataSource, I likely would add a new DataPoint and code for something like snmpDown that reports 1 if snmp isn't working (aka device will be dead soon) and then modify the PeerDown to also check if snmp is working before alerting.