default set of jmx / tomcat metrics is too wide

[ssbarnea]

Please improve the tomcat / jmx default configuration so it will suit most use-case.

I would say the the most-likely desire is to monitor these for JVMs:

• free / total JVM memory
• free / total JVM permgem memory
• current threads / maxthreads
• bytes sent/received - total not for each different servlet as these may easily sum-up to over 100 metrics
• database connection pools (usually "c3p0")
• time spent per request (i don't know yet how to get it properly)

I will attach attributes listings made from common JMV apps, like Jenkins, Jira, Confluence,... and we should be able to find good default set of attributes to monitor.

[remh]

Thanks @ssbarnea

Having the possibility to aggregate servlet metrics over all servlets is I think the highest priority.

Regarding threads, they should be already present: https://github.com/DataDog/dd-agent/blob/master/conf.d/tomcat.yaml.example#L15-L26

Did you have any issue with those ?

Thanks for your feedback!

[ssbarnea]

I am already using the Threads, but there is a problem, I wasn't able to find a way to setup an aler regarding % or amount of threads that could be opened ( max - current).