brooklyn master's version of slf4j is still `<slf4j.version>1.6.6</slf4j.version>`. The method used here is in 1.7.x, but not in 1.6.6 I believe - there if you want more than two args at the end you need to declare an array yourself. i.e.
    `LOG.trace("hostId={}, CDH_NODE_ID={}, entity={}", new Object[] {hostId, root.getAttribute(ClouderaCdhNode.CDH_HOST_ID), root})`

I think the mix of slf4j versions here and in core brooklyn will make this fail (non-deterministically, based on classpath order from mvn?) with a `NoSuchMethodError`.