Local (server) monitoring

You can monitor disk, swap, etc on the server. For example, to monitor the load averages on the Nagios server

define service{
	use                   fionavar-service
	host_name             mornir
	service_description   stats-load
	check_command         check_load!1.5!2!2!2!2.5!2.5
	}

The first three numbers are the levels at which a warning is issued (for load average over 1 minute, 5 minutes, and 15 minutes), and the second set are the level at which a critical alert is issued.