（1）方法一：version 2.0.0.
management.endpoints.web.exposure.include=hystrix.stream" adding in bootstrap.properties;
and the url was change to "http://host:port/actuator/hystrix.stream", it is ok.

also,"management.endpoints.web.base-path=/ " can make "http://host:port/hystrix.stream" work.

（2）方法二：version 2.0.0.

@configuration

@Bean(name = "hystrixRegistrationBean")
public ServletRegistrationBean servletRegistrationBean() {
    ServletRegistrationBean registration = new ServletRegistrationBean(
            new HystrixMetricsStreamServlet(), "/hystrix.stream");
    registration.setName("hystrixServlet");
    registration.setLoadOnStartup(1);
    return registration;
}
 

}

解決連結：https://github.com/Netflix/Hystrix/issues/1566

解決連結：https://blog.csdn.net/qq_22772259/article/details/79812026