Hi Netanel,
Can you check whether JDBC connection pool config is enabled from Configure -> Instrumentation -> JMX screen for Tomcat server in edit mode ?
Also check whether there are any JDBC pool mbean metrics are exposed by server under "Node a827" node dashboard -> JMX -> Mbean browser screen
Find the doc link to configure jmx rules: http://docs.appdynamics.com/display/PRO39/Configure+JMX+Metrics+from+MBeans
Regards,
Arun