Munin-Plugins
Postfix
postfix_mailstats tried to monitor both mail coming into a server and mail leaving a server. These plugins split that task up and provide better detail.
- postfix_smtpd_stats - Incoming connections and accepted/rejected info
- postfix_smtp_stats - Outgoing connections
Note: The postfix_mailvolume plugin double counts the size of mail that has been deferred and requeued.
License Managers
- flexlm_ - Usage stats for licensed software
- rlm_ - Usage stats for licensed software