Thanks for the responses so far. I am aware of jmeter, but it looks to me more like a load stress predictor and we are now looking more at monitoring currently running live systems.
Anyway, what I am hoping is to create a list of things to monitor more than the tools to do the monitoring. The question is which things are actually meaningful to monitor on a live functinoing system that will help give a picture of how close we are coming to problems -- on those live systems.
So, as an example, would charting memory use be significantly useful? How about database hits - reads and writes of new records. I am sure those both are valuable, but what are some others?
Thanks,
////jerry