The 10.3 Release Notes has more details of this change:
APM 10.3 Release Notes > Java Agent > JMS 1.1 Support
JMS 1.1 Support
A new set of agent tracers extends the correlation visibility to include JMS 1.1 applications. Metrics are gathered under Frontends|Messaging Services and Backends|Messaging Services, and these metrics appear as component data within a transaction trace.