I'm trying to figure out a way to verify that a process is running on each server. We have a clustered environment with 4 servers running WebSphere application server and as such I want to confirm that the cluster is healthy at the process level.
This is the closest I've gotten:
sourcetype="ps" "SOME_UNIQUE_PROCESS_NAME" | timechart count by host
Pushing this into an area graph gets close except during some intervals the ps source isn't sampled and therefore returns 0 results instead of 1. It also isn't very robust as as it relies on the span of each sample of the timechart.
As long as you know you're going to get more than one event from ps within the span of 1 minute it should work. The only thing that could get dodgy is it'll drop down to 0.5 between going from 1 and 0 if you are sampling every 30 seconds.