code: protected List<Metric> serializeCounter(String name, Counting counter) {
      return Lists.newArrayList(
          serializeValue(name, counter.getCount(), Measurements.COUNT.name())
      );
    }
docs: Extracts metrics from {@link com.codahale.metrics.Counter}.
  
  @param name name of the {@link com.codahale.metrics.Counter}.
  @param counter instance of {@link com.codahale.metrics.Counter} to serialize.
  @return a list of {@link org.apache.gobblin.metrics.Metric}.