Just a note about a workaround pushed to master for https://issues.jboss.org/browse/HAWKULAR-113. The root cause may or may not be the same as for HWKMETRICS-47, it's not clear, but the behavior is similar. After a lot of research we can see that invoking concurrent, asynchronous EJB methods, that perform rest posts to metrics, can hang the threads in WFly 8.2 (used by Kettle). So, beware the @Asynchronous annotation on pooled EJBs, if the method is performing posts. With no obvious fix, the only choice I could see was to workaround the issue, and make the method synchronous. This was the issue where if you were to add multiple urls to Hawkular, you would quickly end up with all URLs reporting DOWN and basically the application was locked up, with a bunch of hanging threads. Jay