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/
"Traffic" is ethernet/ip traffic generator. The tool consists of server and GUI application.
Typical configuration is to have at least 2 servers and 1 or more client machines, where the servers are controlled and results are displayed.