anchor.diff:  ----
   // nothing is added to simple.histogram; warning is logged
   from("direct:in")
  -    .to("metric:histogram:simple.histogram")
  +    .to("metrics:histogram:simple.histogram")
       .to("direct:out");
   
   ----
  
positive.code: ----
  // update counter simple.counter by 7
  from("direct:in")
      .to("metric:counter:simple.counter?increment=7")
      .to("direct:out");
  ----
  
  
negative.code: ----
  // increment counter simple.counter by 1
  from("direct:in")
      .to("metrics:counter:simple.counter")
      .to("direct:out");
  ----
  
  