Broker does not take any account of signaled message priority.
Applications are unable to rely on broker to deliver higher priority messages before lower priority ones and are forced to implement more convoluted logic to workaround this.
Broker can now be configured such that particular queues recognize message priority and adjust delivery appropriately.
Applications that need prioritized delivery can get this directly from the brokers queue implementation.
Release Note Entry:
Previously, the Messaging Broker did not take signaled message priority into account during message delivery. The Broker can now be configured to recognize higher priority messages and adjust delivery accordingly.