I have configured OpenNMS to collect all kinds of numeric data coming out of tomcat7 jmx. There are a lot of things. I am interested in monitoring this tomcat instance so that I can avoid down time and lockups. What metrics should I be watching out for?
I am already monitoring things like CPU, Memory, Network via SNMP. With this JMX connection the things that I find interesting are
- RequestsCount so far.
- Active sessions and its maximum so far