@Override
    public T create(Throwable cause) {
      if (logger.isLoggable(Level.FINE)) {
        logger.log(Level.FINE, "fallback due to: " + cause.getMessage(), cause);
      }
      return constant;
    }
Returns a constant fallback after logging the cause to FINE level.
hystrix/src/main/java/feign/hystrix/FallbackFactory.java