@Override
    public EurekaUpdatingListenerBuilder decorator(DecoratingHttpClientFunction decorator) {
        return (EurekaUpdatingListenerBuilder) super.decorator(decorator);
    }
Returns a newly-created {@link EurekaUpdatingListener} based on the properties of this builder.
Note that if {@link RetryingClient} was not set using {@link #decorator(DecoratingHttpClientFunction)},
{@link RetryingClient} is applied automatically using
{@linkplain RetryingClient#newDecorator(RetryRule, int)
RetryingClient.newDecorator(RetryRule.failsafe(), 3)}.
eureka/src/main/java/com/linecorp/armeria/server/eureka/EurekaUpdatingListenerBuilder.java