code: public static FastForwardReporter create(
        MetricRegistry registry,
        Optional<HostAndPort> address,
        String metricKey,
        int intervalSeconds)
        throws SocketException, UnknownHostException {
  
      return create(registry, address, metricKey, intervalSeconds, Collections::emptyMap);
    }
docs: Create a new FastForwardReporter instance.
  
  @param registry        MetricRegistry to report to ffwd
  @param address         Optional HostAndPort to override the defaults that ffwd client uses
  @param metricKey       key to use for all metrics
  @param intervalSeconds how often to report metrics to ffwd