code: public static HystrixMetricsPublisherCollapser createOrRetrievePublisherForCollapser(HystrixCollapserKey collapserKey, HystrixCollapserMetrics metrics, HystrixCollapserProperties properties) {
          return SINGLETON.getPublisherForCollapser(collapserKey, metrics, properties);
      }
docs: Get an instance of {@link HystrixMetricsPublisherCollapser} with the given factory {@link HystrixMetricsPublisher} implementation for each {@link HystrixCollapser} instance.
  
  @param collapserKey
  Pass-thru to {@link HystrixMetricsPublisher#getMetricsPublisherForCollapser} implementation
  @param metrics
  Pass-thru to {@link HystrixMetricsPublisher#getMetricsPublisherForCollapser} implementation
  @param properties
  Pass-thru to {@link HystrixMetricsPublisher#getMetricsPublisherForCollapser} implementation
  @return {@link HystrixMetricsPublisherCollapser} instance