某些日志无法通过隔离功能应用程序到达appinsights

Question

我有一个 C# Azure 函数应用程序，它使用

ILogger

登录到应用程序洞察。

直到最近，函数应用程序都是使用.NET 6实现的，一切都很好。然后我将其转换为使用 .NET 8，现在是

dotnet-isolated

。

自从更改以来，每当我在循环内进行日志记录时，似乎我都会丢失日志条目。我确实看到了不在循环内的所有日志，但似乎在转换后，它似乎无法处理快速记录到应用程序洞察？有什么办法可以解决呢？

CSProj 文件：

<Project Sdk="Microsoft.NET.Sdk">


<PropertyGroup>
    <TargetFramework>net8.0</TargetFramework>
    <AzureFunctionsVersion>v4</AzureFunctionsVersion>
    <OutputType>Exe</OutputType>
    <ImplicitUsings>enabled</ImplicitUsings>
  </PropertyGroup>
  <ItemGroup>
    <Content Include="local.settings.json" />
  </ItemGroup>
  <ItemGroup>
    <PackageReference Include="IdentityModel" Version="7.0.0" />
    <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
    <PackageReference Include="RT.Comb" Version="4.0.1" />
    <PackageReference Include="SharpZipLib" Version="1.4.2" />
    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="8.0.8" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="8.0.8" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="8.0.8" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Http" Version="3.2.0" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.Sdk" Version="1.17.4" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker" Version="1.23.0" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore" Version="1.3.2" />
  </ItemGroup>
  <ItemGroup>
    <None Update="host.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </None>
    <None Update="local.settings.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
      <CopyToPublishDirectory>Never</CopyToPublishDirectory>
    </None>
  </ItemGroup>
  <ItemGroup>
    <Folder Include="Migrations\" />
  </ItemGroup>
  <ItemGroup>
    <Using Include="System.Threading.ExecutionContext" Alias="ExecutionContext" />
  </ItemGroup>
</Project>

这是我的host.json：

{
  "version": "2.0",
  "functionTimeout": "02:00:00",
  "logging": {
    "logLevel": {
      "default": "Trace"
    },
    "applicationInsights": {
      "samplingSettings": {
        "isEnabled": false
      }
    }
  }
}

Answer 1

我创建了一个示例.NET 6 Azure Function App，然后将其迁移到.NET 8，可以成功地从循环中看到Application Insights日志。

• 从 .NET 6 迁移到 .NET 8 时，我们可能会遇到由于 NuGet 包未正确安装而导致的问题。因此，请确保软件包相应升级。
• 我已参考此doc进行迁移。

我添加了以下逻辑来循环打印从 1 到 1000 的日志消息。

for (int i = 0; i < 1000; i++)
{
    _logger.LogInformation($"Logging message number {i + 1}");
    await Task.Delay(10);
}
var response = req.CreateResponse(System.Net.HttpStatusCode.OK);

Function1.cs：

using Microsoft.Azure.Functions.Worker;
using Microsoft.Azure.Functions.Worker.Http;
using Microsoft.Extensions.Logging;
using System.Threading.Tasks;
namespace MyFunctionApp
{
    public class Function1
    {
        private readonly ILogger<Function1> _logger;
        public Function1(ILogger<Function1> logger)
        {
            _logger = logger;
        }
        [Function("Function1")]
        public async Task<HttpResponseData> Run(
            [HttpTrigger(AuthorizationLevel.Function, "get", "post")] HttpRequestData req)
        {
            _logger.LogInformation("C# HTTP trigger function processed a request.");

            for (int i = 0; i < 1000; i++)
            {
                _logger.LogInformation($"Logging message number {i + 1}");
                await Task.Delay(10);
            }
            var response = req.CreateResponse(System.Net.HttpStatusCode.OK);
            response.Headers.Add("Content-Type", "text/plain; charset=utf-8");
            response.WriteString("Welcome to Azure Functions!");
            return response;
        }
    }
}

Program.cs：

using Microsoft.Azure.Functions.Worker;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
var host = new HostBuilder()
    .ConfigureFunctionsWorkerDefaults()
    .ConfigureServices(services =>
    {
        services.AddApplicationInsightsTelemetryWorkerService();
    })
    .Build();
await host.RunAsync();

.csproj：

<Project Sdk="Microsoft.NET.Sdk">
    <PropertyGroup>
        <TargetFramework>net8.0</TargetFramework>   <AzureFunctionsVersion>v4</AzureFunctionsVersion>
        <OutputType>Exe</OutputType>
        <ImplicitUsings>enable</ImplicitUsings>
        <Nullable>enable</Nullable>
    </PropertyGroup>
    <ItemGroup>             
        <PackageReference Include="Microsoft.Azure.Functions.Worker" Version="1.23.0" />
        <PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Http" Version="3.2.0" />
        <PackageReference Include="Microsoft.Azure.Functions.Worker.Sdk" Version="1.17.4" />
        <PackageReference Include="Microsoft.ApplicationInsights.WorkerService" Version="2.22.0" />
        <PackageReference Include="Microsoft.Azure.Functions.Worker.ApplicationInsights" Version="1.2.0" />     
        <PackageReference Include="Microsoft.EntityFrameworkCore" Version="8.0.8" />
        <PackageReference Include="Microsoft.Extensions.Logging.ApplicationInsights" Version="2.22.0" />
        <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
    </ItemGroup>
    <ItemGroup>
        <None Update="host.json">
            <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
        </None>
        <None Update="local.settings.json">
            <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
            <CopyToPublishDirectory>Never</CopyToPublishDirectory>
        </None>
    </ItemGroup>
    <ItemGroup>
        <Using Include="System.Threading.ExecutionContext" Alias="ExecutionContext" />
    </ItemGroup>
</Project>

local.settings.json：

{
  "IsEncrypted": false,
  "Values": {
    "AzureWebJobsStorage": "UseDevelopmentStorage=true",
    "FUNCTIONS_WORKER_RUNTIME": "dotnet-isolated",
    "APPLICATIONINSIGHTS_CONNECTION_STRING": "<Connection-string>"
  }
}

输出：

应用程序见解日志：