问题描述

Web App 发布后, Application Insights 收集不到数据了

在应用服务(App Service)中收集应用的监控数据(如Request，Exception，Trace等）时通过Agent(Application Insight Site Extension)来实现的。因更新迭代的关系，有些版本不再，或还没有被支持。如Agent(Application Insight Site Extension 2.8.38)支持.NET Core 2.1 and 3.1, 而 .Net Core 2.2不再被继续支持，而.Net 5却还没有被支持。

一：使用基于代理（agent-based)模式修改.Net Core的版本和Application Agent版本。如：

ApplicationInsightsAgent_EXTENSIONVERSION=~2 同时 升级至.NET Core 3.1 ApplicationInsightsAgent_EXTENSIONVERSION=2.8.37 同时 继续使用.NET Core 2.2

二：使用基于代码模式的Application Insighs:

升级至.NET 5 并更新项目依赖：https://docs.microsoft.com/en-us/azure/azure-monitor/app/asp-net-core

2.1 安装Application Insights SDK，建议一直使用最新的稳定版 Application Insights SDK NuGet package for ASP.NET Core。打开项目中的.csproj文件，以如下示例为参考添加Package引用。

   <ItemGroup>
      <PackageReference Include="Microsoft.ApplicationInsights.AspNetCore" Version="2.16.0" />
    </ItemGroup>

2.2 在项目的Startup类中的 ConfigureServices()方法中，添加 services.AddApplicationInsightsTelemetry()。启动Application Insights

    // This method gets called by the runtime. Use this method to add services to the container.
    public void ConfigureServices(IServiceCollection services)
    {
        // The following line enables Application Insights telemetry collection.
        services.AddApplicationInsightsTelemetry();

        // This code adds other services for your application.
        services.AddMvc();
    }

2.3 设置Application Insights的 instrumentation Connection String。 这里有多种方式来设置Connection String， Connection String的值由Azure Application门户提供

a) 使用系统级环境变量

在系统中添加环境变量参数：APPLICATIONINSIGHTS_CONNECTION_STRING。

b) 在代码设置，使用TelemetryConfiguration对象或ApplicationInsightsServiceOptions

    // This method gets called by the runtime. Use this method to add services to the container.
    public void ConfigureServices(IServiceCollection services)
    {
        var configuration = new TelemetryConfiguration
        {
            ConnectionString = "InstrumentationKey=00000000-0000-0000-0000-000000000000;"
        };

        // The following line enables Application Insights telemetry collection.
        services.AddApplicationInsightsTelemetry(configuration);

        // This code adds other services for your application.
        services.AddMvc();
    }

或者

    public void ConfigureServices(IServiceCollection services)
    {
        var options = new ApplicationInsightsServiceOptions { ConnectionString = "InstrumentationKey=00000000-0000-0000-0000-000000000000;" };
        services.AddApplicationInsightsTelemetry(options: options);
    }

c) 使用配置文件(官方推荐方式)

XML

<?xml version="1.0" encoding="utf-8"?>
<ApplicationInsights xmlns="http://schemas.microsoft.com/ApplicationInsights/2013/Settings">
    <ConnectionString>InstrumentationKey=00000000-0000-0000-0000-000000000000</ConnectionString>
</ApplicationInsights>

JSON(config.json)

{
  "ApplicationInsights": {
    "ConnectionString" : "InstrumentationKey=00000000-0000-0000-0000-000000000000;"
    }
  }

参考资料

How to set a connection string: https://docs.microsoft.com/en-us/azure/azure-monitor/app/sdk-connection-string?tabs=net#how-to-set-a-connection-string

Enable Application Insights server-side telemetry (no Visual Studio): https://docs.microsoft.com/en-us/azure/azure-monitor/app/asp-net-core#enable-application-insights-server-side-telemetry-no-visual-studio

Enable agent-based monitoring:https://docs.microsoft.com/en-us/azure/azure-monitor/app/azure-web-apps?tabs=netcore#enable-agent-based-monitoring

Microsoft.ApplicationInsights.AspNetCore package: https://www.nuget.org/packages/Microsoft.ApplicationInsights.AspNetCore