anchor.diff:  // sets timer action using header
   from("direct:in")
       .setHeader(MetricsConstants.HEADER_TIMER_ACTION, TimerAction.start)
  -    .to("metric:timer:simple.timer")
  +    .to("metrics:timer:simple.timer")
       .to("direct:out");
   ----
   
  
positive.code: // update counter simple.counter by 417
  from("direct:in")
      .setHeader(MetricsConstants.HEADER_COUNTER_INCREMENT, constant(417L))
      .to("metric:counter:simple.counter?increment=7")
      .to("direct:out");
  ----
  
  
negative.code: ----
  // decrement counter simple.counter by 3
  from("direct:in")
      .to("metrics:counter:simple.counter?decrement=3")
      .to("direct:out");
  ----
  
  