打开Hystrix Stream页面，进入后，发现只有一行Unable to connect to Command Metric Stream

解决方法：

在客户端启动类中需要配置servlet

@Bean
public ServletRegistrationBean getServlet(){
   HystrixMetricsStreamServlet streamServlet = new HystrixMetricsStreamServlet();
   ServletRegistrationBean registrationBean = new ServletRegistrationBean(streamServlet);
   registrationBean.setLoadOnStartup(1);
   registrationBean.addUrlMappings("/hystrix.stream");
   registrationBean.setName("HystrixMetricsStreamServlet");
   return registrationBean;
}