So, I've been looking around for some time for a real monitoring solution, something that was actually configurable; since Munin has been dead for some years, and Cacti requires an engineer to create the rrdtool file required to make it function correctly;
then I came across zabbix.
See an example below, our LIVE bandwidth stats on Orlando1:
http://www.goodhosting.co/live/
Details: - 1 Second Precision - Bit-perfect Precision Delta Storage - Historical Data / Trend Storage [Delta] - Customizable Retrieval Periods on all Graphs...
And if you have a fairly strong network:
http://www.goodhosting.co/live/?please-hurt-my-internet
LIVE updates every 2.5 second.
Currently my graph jumps about, because I haven't set the upper/lower bounds yet (so the scaling on the left changes rapidly as new samples are brought in. I'll be fixing that shortly.)