Plugins for Nagios that were originally written by Cheako.
check_pstime Using Proc::ProcessTable with native kernel scraping collect process time and child times.
Here are some graphs it generates along with a graph of the load avg over the same period.The images are:
Bitcoin CPU15052
Bitcoin CPUctime15052
Cron CPU15052
Cron CPUctime15052
fail2ban CPU15052
fail2ban CPUctime15052
Load AVG15052
Moderate CPU15052
None CPU15052
tor CPU15052
Moderate and None are just random processes that looked to be good for making a baseline comparison.