关于SpringCloud中，使用 Hystrix的问题

springCloud升级后。导致 HtystrixDashboard 默认的servlet请求路径修改了
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

显示的声明一个 servlet组



/**

     *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;

    }

确认是否引入 actuator 的依赖

<dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-actuator</artifactId>

</dependency>

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
将此地址配入 htystrix
查看是否能正确访问：
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;

    }

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