static boolean await(CountDownLatch latch) {
    try {
      latch.await();
      return true;
    } catch (InterruptedException e) {
      Thread.currentThread().interrupt();
      return false;
    }
  }
Returns true if uninterrupted waiting for the latch
zipkin-server/src/main/java/zipkin2/server/internal/throttle/ThrottledCall.java