code: public HystrixCollapserProperties getCollapserProperties(HystrixCollapserKey collapserKey, HystrixCollapserProperties.Setter builder) {
          return new HystrixPropertiesCollapserDefault(collapserKey, builder);
      }
docs: Construct an implementation of {@link HystrixCollapserProperties} for {@link HystrixCollapser} instances with {@link HystrixCollapserKey}.
  <p>
  <b>Default Implementation</b>
  <p>
  Constructs instance of {@link HystrixPropertiesCollapserDefault}.
  
  @param collapserKey
  {@link HystrixCollapserKey} representing the name or type of {@link HystrixCollapser}
  @param builder
  {@link com.netflix.hystrix.HystrixCollapserProperties.Setter} with default overrides as injected to the {@link HystrixCollapser} implementation.
  <p>
  The builder will return NULL for each value if no override was provided.
  
  @return Implementation of {@link HystrixCollapserProperties}