code: public static void onNextDropped(Consumer<Object> c) {
  		Objects.requireNonNull(c, "onNextDroppedHook");
  		log.debug("Hooking new default : onNextDropped");
  
  		synchronized(log) {
  			if (onNextDroppedHook != null) {
  				onNextDroppedHook = onNextDroppedHook.andThen(c);
  			}
  			else {
  				onNextDroppedHook = c;
  			}
  		}
  	}
docs: Override global data dropped strategy which by default logs at DEBUG level.
  <p>
  The hook is cumulative, so calling this method several times will set up the hook
  for as many consumer invocations (even if called with the same consumer instance).
  
  @param c the {@link Consumer} to apply to data (onNext) that is dropped
  @see #onNextDroppedFail()