如何从 Azure Function App 中的 appsettings.json 配置设置 Application Insights（dotnet 隔离）？

Question

我想使用 appsettings.json 配置 Application Insights 日志记录级别，就像我为 ASP.NET Core Web 应用程序所做的那样。

默认情况下，Application Insights SDK 添加“警告”日志记录级别筛选器，如下图所示。

我已读到，要配置 Application Insights 日志记录，使用

Logging.LogLevel.Default:

设置默认日志记录级别是不够的，必须明确指定：

Logging.ApplicationInsights.LogLevel.Default:

。

但是，即使使用显式配置，我仍然观察到默认的“警告”过滤器，并且我需要在

ConfigureLogging()

中手动将其删除。

我做错了什么？

程序.cs：

var host = new HostBuilder()
    .ConfigureFunctionsWebApplication((context, builder) => { })
    .ConfigureAppConfiguration((context, builder) =>
    {
        var environment = context.Configuration.GetValue<string>("ENVIRONMENT", "development");

        builder.AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
            .AddJsonFile($"appsettings.{environment}.json", optional: true, reloadOnChange: true)
            .AddEnvironmentVariables();
    })
    ...
    .ConfigureLogging(builder =>
    {
        builder.Services.Configure<LoggerFilterOptions>(options =>
        {
            // Default ApplicationInsights logging filter
            LoggerFilterRule defaultRule = options.Rules.FirstOrDefault(rule => rule.ProviderName
                == "Microsoft.Extensions.Logging.ApplicationInsights.ApplicationInsightsLoggerProvider");
            if (defaultRule is not null)
            {
                options.Rules.Remove(defaultRule);
            }
        });
        builder.AddFilter<ApplicationInsightsLoggerProvider>("", LogLevel.Information);
    })
    .Build();

appsettings.json：

{
  "Logging": {
    "LogLevel": {
      "Default": "Information"
    },
    "ApplicationInsights": {
      "LogLevel": {
        "Default": "Information"
      }
    }
  }
}

Answer 1

使用

appsettings.json

在隔离的 Azure 功能中配置应用程序洞察。

appsettings.json

{
  "AllowedHosts": "*",
  "ApplicationInsights": {
    "InstrumentationKey": "884669a2-08ea-46d3-9fe1-104311129c82"
  }
}

注意：您还可以在

appsettings.json

中配置日志级别。

程序.cs：

• 配置 App Insights 日志记录以记录具有所需严重性级别的消息（警告/信息/调试/错误等）

var host = new HostBuilder()
    .ConfigureFunctionsWebApplication()
    .ConfigureAppConfiguration((context, config) =>
    {
        config.AddJsonFile("appsettings.json", optional: false, reloadOnChange: true);
    })
    .ConfigureServices((context, services) =>
    {
        var configuration = context.Configuration;
        services.AddApplicationInsightsTelemetryWorkerService(options =>
        {
            options.ConnectionString = configuration["ApplicationInsights:InstrumentationKey"];
        });
    }).ConfigureLogging(logging =>
    {        
        loggingBuilder.AddApplicationInsights();
        loggingBuilder.SetMinimumLevel(LogLevel.Error);
    })
    .Build();

host.Run();

函数.cs：

 [Function("Function1")]
 public IActionResult Run([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post")] HttpRequest req)
 {
     _logger.LogInformation("This is an INFORMATION log message.");
     _logger.LogWarning("This is a WARNING log message.");
     _logger.LogError("This is an ERROR log message.");
     _logger.LogTrace("This is a TRACE log message.");
     _logger.LogDebug("This is a DEBUG log message.");
     _logger.LogCritical("This is a CRITICAL log message.");

     return new OkObjectResult("Welcome to Azure Functions!");
 }

• 能够记录严重级别>3的消息（错误日志）：

查询：

union isfuzzy=true
    availabilityResults,
    requests,
    exceptions,
    pageViews,
    traces,
    customEvents,
    dependencies
| where timestamp > datetime("2024-09-22T12:09:27.658Z") and timestamp < datetime("2024-09-23T12:09:27.658Z")
| order by timestamp desc
| take 100