Method observeOn

src/main/java/io/reactivex/rxjava3/core/Maybe.java:4428–4434

Wraps a Maybe to emit its item (or notify of its error) on a specified Scheduler, asynchronously. Scheduler: you specify which

(@NonNull Scheduler scheduler)

     * @see #subscribeOn
     */
    @CheckReturnValue
    @NonNull
    @SchedulerSupport(SchedulerSupport.CUSTOM)
    public final Maybe<T> observeOn(@NonNull Scheduler scheduler) {
        Objects.requireNonNull(scheduler, "scheduler is null");
        return RxJavaPlugins.onAssembly(new MaybeObserveOn<>(this, scheduler));
    }

    /**
     * Filters the items emitted by the current {@code Maybe}, only emitting its success value if that