code: protected List<Metric> serializeSingleValue(String name, Number value, String... path) {
      return Lists.newArrayList(
        serializeValue(name, value, path)
      );
    }
docs: Convert single value into list of {@link org.apache.gobblin.metrics.Metric}.
  
  @param name name of the metric.
  @param value value of the metric.
  @param path suffixes to more precisely identify the meaning of the reported value
  @return a Singleton list of {@link org.apache.gobblin.metrics.Metric}.