code: public static void reset(long time, TimeUnit unit) {
          // shutdown thread-pools
          HystrixThreadPool.Factory.shutdown(time, unit);
          _reset();
      }
docs: Reset state and release resources in use (such as threadpools) and wait for completion.
  <p>
  NOTE: This can result in race conditions if HystrixCommands are concurrently being executed.
  </p>
  
  @param time
  time to wait for thread-pools to shutdown
  @param unit
  {@link TimeUnit} for <pre>time</pre> to wait for thread-pools to shutdown