code: @Deprecated
      protected boolean isCircuitBreakerException(Throwable e) {
          if (getRetryHandler() != null) {
              return getRetryHandler().isCircuitTrippingException(e);
          }
          return false;
      }
docs: 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.