code: public final <U> Flux<T> delaySubscription(Publisher<U> subscriptionDelay) {
  		return onAssembly(new FluxDelaySubscription<>(this, subscriptionDelay));
  	}
docs: Delay the {@link Flux#subscribe(Subscriber) subscription} to this {@link Flux}
  source until another {@link Publisher} signals a value or completes.
  
  <p>
  <img class="marble" src="doc-files/marbles/delaySubscriptionWithPublisherForFlux.svg" alt="">
  
  @param subscriptionDelay a companion {@link Publisher} whose onNext/onComplete signal will trigger the {@link Flux#subscribe(Subscriber) subscription}
  @param <U> the other source type
  
  @return a delayed {@link Flux}