I'm running multiple ubuntu (precise) boxes & I've got collectd pushing data up to a central logstash box, which is then sending it to carbon (graphite).
I'm running the processes plugin for collectd, which gives CPU time with a 10 second interval. What I want to be able to chart in graphite is the cpu usage (either in jiffies or preferably in a percentage, but I realise that can be problematic) for each process.
I'm just not grokking how to take the process CPU time metric which is a ever-increasing counter of the cpu time used by the process and turn that into a gauge of how much cpu the process is using over time.
Can I do this, and if so, how?