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Steps to Reproduce:
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Start a Hawkular server. Clone the Metrics project, change directory to integration-tests/load-tests then run mvn gatling:execute -Dclients=300 -Dloops=500

After some time, the server show this warning:

WARN [org.apache.activemq.broker.region.TopicSubscription] (ActiveMQ VMTransport: vm://org.hawkular.bus.broker.stetson#7-2) TopicSubscription: consumer=ID:stetson-44140-1445807025525-7:1:-1:2, destinations=1, dispatched=32767, delivered=46948, matched=32768, discarded=0: has twice its prefetch limit pending, without an ack; it appears to be slow

And eventually runs out of memory.
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Start a Hawkular server. Clone the Metrics project, change directory to integration-tests/load-tests then run mvn gatling:execute -Dclients=300 -Dloops=500 After some time, the server show this warning: WARN [org.apache.activemq.broker.region.TopicSubscription] (ActiveMQ VMTransport: vm://org.hawkular.bus.broker.stetson#7-2) TopicSubscription: consumer=ID:stetson-44140-1445807025525-7:1:-1:2, destinations=1, dispatched=32767, delivered=46948, matched=32768, discarded=0: has twice its prefetch limit pending, without an ack; it appears to be slow And eventually runs out of memory.

Under heavy load, MetricReceiver bean is a slow consumer and makes the system run out of memory.