reactor-core/src/main/java/reactor/core/publisher/Flux.java
public final Flux<T> doAfterTerminate(Runnable afterTerminate) {
		Objects.requireNonNull(afterTerminate, "afterTerminate");
		return doOnSignal(this, null, null, null, null, afterTerminate, null, null);
	}
public final Flux<T> doAfterTerminate(Runnable afterTerminate) {
		Objects.requireNonNull(afterTerminate, "afterTerminate");
		return doOnSignal(this, null, null, null, null, afterTerminate, null, null);
	}
Add behavior (side-effect) triggered after the {@link Flux} terminates, either by completing downstream successfully or with an error.
<p>
<img class="marble" src="doc-files/marbles/doAfterTerminateForFlux.svg" alt="">

@param afterTerminate the callback to call after {@link Subscriber#onComplete} or {@link Subscriber#onError}

@return an observed  {@link Flux}