I'm curious after seeing a few mentions of nagios recently - what are people using with nagios for monitoring and what are you monitoring?
Agent wise - NCPA? NRPE? NRDP?
What do you check per Windows/Linux Server? (services that should be started, ports that should be open, CPU, memory, disk space, time drift, snapshots on Hyper-V, anything else?)
Do you monitor network devices (ports, SNMP for status of ports/bandwidth utilisation/cpu/memory/etc, anything else?)
Do you monitor vSphere? If so what agent?
Do you export data from nagios (e.g. do you use data from nagios for some sort of overview dashboard?)