@UnstableApi
    public AbstractLoggingClientBuilder successSampler(
            Sampler<? super ClientRequestContext> successSampler) {
        this.successSampler = requireNonNull(successSampler, "successSampler");
        return this;
    }
Sets the {@link Sampler} that determines which success request needs logging.
core/src/main/java/com/linecorp/armeria/client/logging/AbstractLoggingClientBuilder.java