@Deprecated
    protected boolean isCircuitBreakerException(Throwable e) {
        if (getRetryHandler() != null) {
            return getRetryHandler().isCircuitTrippingException(e);
        }
        return false;
    }
Determine if an exception should contribute to circuit breaker trip. If such exceptions happen consecutively
on a server, it will be deemed as circuit breaker tripped and enter into a time out when it will be
skipped by the {@link AvailabilityFilteringRule}, which is the default rule for load balancers.
ribbon-loadbalancer/src/main/java/com/netflix/client/AbstractLoadBalancerAwareClient.java