Application Map 设置 Role 的 Instance 名称

本设置针对使用 SpringBoot 的应用程序。

如下图，在 Azure Application Insights Map 中对于同一个微服务可能会有多个实例（默认的实例名为运行的机器名），以下步骤展示如何自定义该值：

1. 添加 telemetry 初始化类

   参考链接：
   https://github.com/microsoft/ApplicationInsights-Java/issues/632 (opens new window)
   https://github.com/Microsoft/ApplicationInsights-Java/blob/master/azure-application-insights-spring-boot-starter/README.md (opens new window)

   package com.example.demo.configuration;
   
   import com.microsoft.applicationinsights.extensibility.TelemetryInitializer;
   import com.microsoft.applicationinsights.telemetry.Telemetry;
   import com.microsoft.applicationinsights.web.extensibility.initializers.WebTelemetryInitializerBase;
   
   public class CloudRoleNameInitializer implements  TelemetryInitializer  {
   
       @Override
       public void initialize(Telemetry telemetry) {
           String computerName = System.getenv().get("COMPUTERNAME");
           telemetry.getContext().getCloud().setRoleInstance(computerName);
       }
   }
   

2. 在启动类（Application.java）中使用该类

   package com.example.demo;
   
   import java.util.Arrays;
   
   import org.springframework.boot.CommandLineRunner;
   import org.springframework.boot.SpringApplication;
   import org.springframework.boot.autoconfigure.SpringBootApplication;
   import org.springframework.boot.builder.SpringApplicationBuilder;
   import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
   import org.springframework.context.ApplicationContext;
   import org.springframework.context.annotation.Bean;
   
   import com.microsoft.applicationinsights.extensibility.TelemetryInitializer;
   
   @SpringBootApplication
   public class Application extends SpringBootServletInitializer {
   
       @Override
       protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
           return application.sources(Application.class);
       }
   
       public static void main(String[] args) {
           SpringApplication.run(Application.class, args);
       }
   
       @Bean
       public TelemetryInitializer myTelemetryInitializer() {
           return new CloudRoleNameInitializer();
       }
   }
   

3. 如下图，就可以得到自定义的 cloud role instance 了，Application Map 中显示出的 Instance 的数量就等同于 cloud role instance 按名称分组的情况。