Observation while browsing All Devices page
Sometimes some hostnames are showing in red, but these devices are actually reachable via snmpwalk from LibreNMS server. At a later time, some other hostnames being reachable via snmpwalk display in red.
Q1: hostname displaying in red = polling to these devices in the last polling cycle was failed?
Q2: What could be the root causes of this kind of intermittent failures?
Any help would be much appreciated.