如何在 Dotnet6 Web API 中获得自适应采样以与 Application Insights 和 Serilog 配合使用？

Question

我正在使用 Application Insights 版本 2.22.0 和 Serilog 5.1.0。我尝试在 HomeController Index 端点中记录一个简单字符串的 1000 次迭代（因此每次都是相同的字符串），但所有这些迭代都会到达 AI。为什么会出现这种情况？ AI 不会自动使用自适应采样吗？或者使用 Serilog 覆盖它？如果没有的话如何手动设置？

这是我的代码：

appsettings.json：

  "ApplicationInsights": {
    "InstrumentationKey": "..."
  },
  "Serilog": {
    "Using": [ "Serilog.Exceptions", "Serilog.Sinks.ApplicationInsights", 
  "{project namespace}" ],
    "Enrich": [ "WithExceptionDetails" ],
    "MinimumLevel": {
      "Default": "Information",
      "Override": {
        "Microsoft": "Warning",
        "Microsoft.Hosting.Lifetime": "Information",
        "WebOptimizer": "Warning"
      }
    },
    "WriteTo": [
      {
        "Name": "Console"
      },
      {
        "Name": "File",
        "Args": {
          "path": "logs/log.txt",
          "rollingInterval": "Day",
          "outputTemplate": "[{Timestamp:HH:mm:ss} {Level:u3}] {SourceContext} - {Message:lj}{NewLine}{Exception}"
        }
      },
      {
        "Name": "ApplicationInsights",
        "Args": {
          "connectionString": "InstrumentationKey=...",
          "telemetryConverter": 
            "Serilog.Sinks.ApplicationInsights.TelemetryConverters.TraceTelemetryConverter, Serilog.Sinks.ApplicationInsights"
      }
    }
  ]
},

程序.cs：

private static WebApplication BuildWebApp(string[] args, IConfigurationQueries configurationQueries, IConfiguration configuration)
{
    var builder = WebApplication.CreateBuilder(args);

    // Use Castle.Windsor as dependency injection container
    var container = new Castle.Windsor.WindsorContainer();
    var serviceProviderFactory = new Castle.Windsor.Extensions.DependencyInjection.WindsorServiceProviderFactory(container);
    builder.Host.UseServiceProviderFactory(serviceProviderFactory);
    builder.Host.ConfigureContainer<Castle.Windsor.IWindsorContainer>(c => Bootstrapper.Install(c));
    builder.Host.UseSerilog((context, config) =>
    {
        config.ReadFrom.Configuration(configuration);
        config.Enrich.With(new CustomEnricher(configuration));
    });

    var startup = new Startup(builder.Configuration, builder.Environment);
    startup.ConfigureServices(builder.Services, configurationQueries);

    var app = builder.Build();
    startup.ConfigurePipeline(app);

    return app;
}

Startup.cs：

public void ConfigureServices(IServiceCollection services, IConfigurationQueries configurationQueries)
{
  ...
  services.ConfigureInstrumentation(_configuration, _logger);
  ...

  _logger.LogInformation($"Dependency Injection is Configured for Environment '{_environment.EnvironmentName}'.");
}

仪器.cs：

public static IServiceCollection ConfigureInstrumentation(this IServiceCollection services, IConfiguration configuration, ILogger logger)
{
    var initializer = new InstrumentationInitializer(configuration);
    var options = initializer.CreateServiceOptions();

    services.AddSingleton<ITelemetryInitializer, WebTelemetryInitializer>();
    services.AddApplicationInsightsTelemetryProcessor<WebTelemetryFilter>();

    logger.LogInformation($"Application Insights was initialized with Instrumentation Key '{options.InstrumentationKey}'");
    services.AddApplicationInsightsTelemetry(options);

    return services;
}

CreateServiceOptions-方法：

public ApplicationInsightsServiceOptions CreateServiceOptions()
{
  var instrumentationKey = _configuration["ApplicationInsights:InstrumentationKey"];

  var options = new ApplicationInsightsServiceOptions
  {
    InstrumentationKey = instrumentationKey
  };

#if DEBUG
  options.DeveloperMode = true;
  options.EnableDebugLogger = true;
#endif

  return options;
}

即使默认情况下应启用自适应采样，所有跟踪/信息日志语句都会发送到 AI？或者它是否被 Serilog 以某种方式覆盖？

谁能告诉我需要添加什么才能在我的项目中启用自适应采样？

Answer 1

即使默认情况下应启用自适应采样，所有跟踪/信息日志语句都会发送到 AI？或者它是否被 Serilog 以某种方式覆盖？

我使用自适应采样如下：

using Microsoft.ApplicationInsights.Extensibility;
using Serilog;

var rith = WebApplication.CreateBuilder(args);

rith.Host.UseSerilog((cxt, ri_cf) =>
{
    ri_cf.ReadFrom.Configuration(cxt.Configuration)
          .WriteTo.Console()
          .WriteTo.ApplicationInsights(
              new TelemetryConfiguration
              {
                  ConnectionString = cxt.Configuration["ApplicationInsights:ConnectionString"] 
              },
              TelemetryConverter.Traces);
});

rith.Services.AddApplicationInsightsTelemetry(options =>
{
    options.EnableAdaptiveSampling = true;
});

有了这个，我就可以使用它，并且我还在应用程序洞察中启用了自适应采样。