anchor.diff:  Example
   [source, shell]
   ----
  -curl -i http://localhost:8080/hawkular/inventory/rest-test/resources/x1422733176502 -HAccepts:application/json
  +curl -i http://localhost:8080/hawkular/inventory/rest-test/resources/x1422733176502 -H "Content-Type: application/json"
   HTTP/1.1 200 OK
   Connection: keep-alive
   X-Powered-By: Undertow/1
  
positive.code: 
  [source,shell]
  ----
  curl -i http://localhost:8080/hawkular/inventory/rest-test/resources/x1422733176502/metrics -HAccepts:application/json
  HTTP/1.1 200 OK
  Connection: keep-alive
  X-Powered-By: Undertow/1
  
negative.code: ----
  (1) Name of the metric, required
  (2) Unit - optional, "NONE" is default
  (3) Description: String, optional
  