code: public static AsmHistogram registerWorkerHistogram(String topologyId, String name, AsmHistogram histogram) {
          return (AsmHistogram) registerWorkerMetric(
                  MetricUtils.workerMetricName(topologyId, host, 0, name, MetricType.HISTOGRAM), histogram);
      }
docs: simplified helper method to register a worker histogram
  
  @param topologyId topology id
  @param name       metric name, NOTE it's not a full-qualified name.
  @param histogram  histogram
  @return registered histogram