Webminstats is a Webmin's module which display a graphical log of historic information. It's modular in design, as to be able to log everything from CPU usage to email box size.
A must have for Webmin users. Awesome job!
An awesome and easy graphical display of system resources.
I've used it successfully for a number of years. Great basic system for tracking performance. Author is accessible, helpful and responsive. If it fits your needs, use it!