#5416: Added a bit more about headless service for metrics
#5416: Added a bit more about headless service for metrics

zmhassan/fabric8,zmhassan/fabric8,chirino/fabric8v2,dhirajsb/fabric8,rhuss/fabric8,chirino/fabric8v2,christian-posta/fabric8,KurtStam/fabric8,KurtStam/fabric8,KurtStam/fabric8,christian-posta/fabric8,KurtStam/fabric8,chirino/fabric8v2,chirino/fabric8v2,dhirajsb/fabric8,dhirajsb/fabric8,rhuss/fabric8,zmhassan/fabric8,christian-posta/fabric8,rhuss/fabric8,dhirajsb/fabric8,zmhassan/fabric8,christian-posta/fabric8,rhuss/fabric8