关于SpringCloud中，使用 Hystrix的问题

1. springCloud升级后。导致 HtystrixDashboard 默认的servlet请求路径修改了
2. 将业务的微服务使用 HtystrixDashboard 仪表盘第一次监控时出现 Unable to connect to Command Metric Stream.

解决办法： 这都是 业务微服务端更改。不是 htystrix

1. 显示的 声明一个 servlet组

2. 
   /**
        *此配置是为了服务监控而配置，与服务容错本身无关，springcloud升级后的坑
        *ServletRegistrationBean因为springboot的默认路径不是"/hystrix.stream"，
        *只要在自己的项目里配置上下面的servlet就可以了
        * cloud更改前的路径应该是 /actuator/hystrix
        */
       @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;
       }

3. 确认是否引入  actuator 的依赖

4. <dependency>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-starter-actuator</artifactId>
   </dependency>

5. 一切准备完成后。 访问 htystrix 检测的地址 ：  localhost:端口/htystrix.stream  . 进行业务访问 。发现有 ping出现。说明此时客户端没有问题了
6. 
7. 将此地址配入 htystrix
8. 查看是否能正确访问：
9. 如果还是出现 Unable to connect to Command Metric Stream. 查看一下log日志。 发现是   could'n allow list. 那么在 htystrict端的 application.yml 文件中。配置host允许

   hystrix:
     dashboard:
       proxy-stream-allow-list: localhost

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/**
     *此配置是为了服务监控而配置，与服务容错本身无关，springcloud升级后的坑
     *ServletRegistrationBean因为springboot的默认路径不是"/hystrix.stream"，
     *只要在自己的项目里配置上下面的servlet就可以了
     * cloud更改前的路径应该是 /actuator/hystrix.stream
     */
    @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;
    }