~/src/nagiosstat/README has a step by step install.
nagiostat will graph anything you give it. Remember, nagiostat is not installed on remote boxes, it's installed on the central nagios server that is showing you "CPU usage 60% load or whatever"
Depending on how you setup the rrd database, is how the graphs will look. My graphs are 5 yrs long and show many different items.
Warning, rrd has a steep learning curve. So if you are unwilling to run
then please stop now. You have to put your head into rrd and study the man pages, experiment with parsing and displaying your data the way you want it.