static CircuitBreakerRule onServerErrorStatus() {
        return builder().onServerErrorStatus().thenFailure();
    }
Returns a newly created {@link CircuitBreakerRule} that will report a {@link Response} as a failure,
if the class of the response status is {@link HttpStatusClass#SERVER_ERROR}.
core/src/main/java/com/linecorp/armeria/client/circuitbreaker/CircuitBreakerRule.java