code: static String generateFullMetricDescription(String metricName, Metric metric) {
      return "Collected from "
          + SOURCE
          + " (metric="
          + metricName
          + ", type="
          + metric.getClass().getName()
          + ")";
    }
docs: Returns the metric description.
  
  @param metricName the initial metric name
  @param metric the codahale metric class.
  @return a String the custom metric description