Dan Langille's Other Diary
He has another, more popular, diary. This one is more general.
Network monitoring
Monitoring FreeBSD jails from the host
Listen queue overflow
Munin
Monitoring backups via Nagios and a shell script
Wireless Diagnostics on OSX – check your wifi
Monitoring temperature
ntp wasn’t running but Nagios didn’t notice
NRPE: Unable to read output
smartmontools – patch