Is there a way in Reactor to ignore error signals?

since you are already processing urls in a flatmap, use onErrorResume(e -> Mono.empty()). this will let flatmap ignore the error. edit: within the flatmap, on the right hand side of the lambda

Now we have reactor.core.publisher.onErrorContinue() in version 3.3.2, which allows you to send onNext() signal when some elements is onError(). Use log() you will see better.

The signature is (throwable, instance) so if you want to log the errored out one, is useful.

Flux.fromIterable(aList)
    .flatMap(this::xxxx)
    .onErrorContinue((throwable, o) -> {
        log.error("Error while processing {}. Cause: {}", o, throwable.getMessage());
})
    ....

Flux.fromArray(trackersArray)
.flatMap(tracker -> 
           ConnectToTracker.connect(tracker.getTracker(), tracker.getPort())
                .onErrorResume(SocketTimeoutException.class, __ -> Mono.empty()))

Maybe this is better of doing the same it will on recover from SocketTimeOut and if the exception is other i will go for the onError