protected boolean isRetryable(ErrorType err) {
        if ((err == OutboundErrorType.RESET_CONNECTION)
                || (err == OutboundErrorType.CONNECT_ERROR)
                || (err == OutboundErrorType.READ_TIMEOUT
                        && IDEMPOTENT_HTTP_METHODS.contains(
                                zuulRequest.getMethod().toUpperCase(Locale.ROOT)))) {
            return isRequestReplayable();
        }
        return false;
    }
Override to track your own request stats.
zuul-core/src/main/java/com/netflix/zuul/filters/endpoint/ProxyEndpoint.java