Please check the documentation
https://jolokia.org/reference/html/index.html for general documentation how to access Kubernetes, and
https://github.com/rhuss/jmx4perl/blob/master/config/tomcat8.cfg for some examples of MBean names and attributes which contains relevant metrics (check also the other files like memory.cfg)
You need a basic understanding of JMX though (out of scope of this forum, check Stack Overflow or some decent JMX documentation)
... roland