Reports classes that directly implement the Subscriber interface.
Consider using static generators from RxJava, Reactor or Mutiny, for example:
Flux.just(), Flux.create(), Flux.generate(), Flux.from()Mono.create(), Mono.from(), Mono.just()Flowable.just(), Flowable.from()Maybe.just(), Maybe.from()Multi.createFrom(), Multi.createBy()Uni.createFrom()