anchor.diff:  // updates meter simple.meter with value 345
   from("direct:in")
       .setHeader(MetricsConstants.HEADER_METER_MARK, constant(345L))
  -    .to("metric:meter:simple.meter?mark=123")
  +    .to("metrics:meter:simple.meter?mark=123")
       .to("direct:out");
   ----
   
  
positive.code: ----
  // decrement counter simple.counter by 3
  from("direct:in")
      .to("metric:counter:simple.counter?decrement=3")
      .to("direct:out");
  ----
  
  
negative.code: // update gauge simple.gauge by a String literal "myUpdatedSubject"
  from("direct:in")
      .setHeader(MetricsConstants.HEADER_GAUGE_SUBJECT, constant("myUpdatedSubject"))
      .to("metrics:counter:simple.gauge?subject=#mySubjectBean")
      .to("direct:out");
  ----
  
  