Start an agent, then kill it. See this exception/error logged in the h-server:

17:00:43,661 ERROR [org.hawkular.cmdgw.command.ws.server.FeedWebSocket] (default task-32) HAWKFEEDCOMM000042: Failed sending feed closed message to bus: feedId [mazzlap], reason [], code [CLOSED_ABNORMALLY]: javax.jms.JMSException: There is no topic with name HawkularTopic
at org.apache.activemq.artemis.jms.client.ActiveMQSession.createTopic(ActiveMQSession.java:373)
at org.hawkular.bus.common.ConnectionContextFactory.createDestination(ConnectionContextFactory.java:333)
at org.hawkular.bus.common.ConnectionContextFactory.createProducerConnectionContext(ConnectionContextFactory.java:96)
at org.hawkular.cmdgw.command.ws.server.FeedWebSocket.feedSessionClose(FeedWebSocket.java:63)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at io.undertow.websockets.jsr.annotated.BoundMethod.invoke(BoundMethod.java:87)
at io.undertow.websockets.jsr.annotated.AnnotatedEndpoint$4.run(AnnotatedEndpoint.java:211)
at io.undertow.websockets.jsr.ServerWebSocketContainer$1.call(ServerWebSocketContainer.java:162)
at io.undertow.websockets.jsr.ServerWebSocketContainer$1.call(ServerWebSocketContainer.java:159)
at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
at io.undertow.websockets.jsr.ServerWebSocketContainer.invokeEndpointMethod(ServerWebSocketContainer.java:575)
at io.undertow.websockets.jsr.ServerWebSocketContainer$6.run(ServerWebSocketContainer.java:561)
at io.undertow.websockets.jsr.OrderedExecutor$ExecutorTask.run(OrderedExecutor.java:67)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)