Master/node to gather and graph "everything" on your systems using Tobi Oetiker's rrdtool. It can optionally warn your surveillance software. This software package was originally called LRRD. The project. Please see http://munin-monitoring.org/
Voswatcher is a tool to collect time correlated performance data on a Solaris or Linux system. This is a tool to gather data before, during, and after an event. It is a set of scripts which makes it suitable for use with sensitive clients.