Add support for Hystrix Metrics Event Stream.
This could be accomplished as a simple fraction, as it requires a small addition to web.xml plus the POM dependency.
Currently blocked on an Undertow bug which is fixed in Undertow 1.3.12 (or so is claimed, I haven't tested). It looks like SWARM currently points at Wildfly 10CR5, which points at wildfly-core 2.0.7.Final, and wildfly-core fixes this in 2.0.8.Final-SNAPSHOT. So implementing this requires upstream dependency changes from both WF and WF core.