如何使用Serilog记录器有效禁用Azure Function（隔离模式）中的内置日志？

Question

如何在 Azure Function v4 隔离进程中禁用这些日志？

2023-01-31T10:36:55Z   [Verbose]   Initiating background SyncTriggers operation
2023-01-31T10:37:10Z   [Verbose]   Request successfully matched the route with name '' and template 'admin/warmup'
2023-01-31T10:37:20Z   [Verbose]   Request successfully matched the route with name '' and template 'admin/warmup'
2023-01-31T10:38:38Z   [Verbose]   HttpMessageHandler expired after 120000ms for client ''
2023-01-31T10:38:48Z   [Verbose]   Starting HttpMessageHandler cleanup cycle with 1 items
2023-01-31T10:38:48Z   [Verbose]   Ending HttpMessageHandler cleanup cycle after 0.4573ms - processed: 1 items - remaining: 0 items
2023-01-31T10:45:48Z   [Verbose]   Sending invocation id:b9d8419b-26...
2023-01-31T10:52:36Z   [Information]   Executed 'Functions...
2023-01-31T10:52:36Z   [Information]   Executing 'Functions...
...

我正在使用 Serilog。 我已经尝试设置host.json如下：

{
    "version": "2.0",
    "logging": {
        "fileLoggingMode": "debugOnly",
        "logLevel": {
            "Function.MyFunction": "None",
            "Host.Aggregator": "None",
            "Host.Results": "None",
            "Microsoft": "None",
            "Microsoft.Hosting.Lifetime": "None",
            "Microsoft.AspNetcore": "None",
            "Microsoft.AspNetCore.Mvc.Internal": "None",
            "Microsoft.AspNetCore.Authentication": "None",
            "Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware": "None",
            "Microsoft.Extensions.Http.DefaultHttpClientFactory": "None",
            "Microsoft.Extensions.Hosting": "None",
            "System.Net.Http.HttpClient": "None",
            "Worker": "None"
        },
        "applicationInsights": {
            "samplingSettings": {
                "isEnabled": true,
                "excludedTypes": "Request"
            },
            "LogLevel": {
                "Default": "Warning",
                "Host.Aggregator": "None",
                "Host.Results": "None",
                "Microsoft": "None",
                "Microsoft.Hosting.Lifetime": "None",
                "Microsoft.AspNetcore": "None",
                "Microsoft.AspNetCore.Mvc.Internal": "None",
                "Microsoft.AspNetCore.Authentication": "None",
                "Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware": "None",
                "Microsoft.Extensions.Http.DefaultHttpClientFactory": "None",
                "Microsoft.Extensions.Hosting": "None",
                "System.Net.Http.HttpClient": "None",
                "Worker": "None"
            }
        }
    }
}

我还尝试在UseSerilog()方法中按如下方式设置 Serilog：

loggerConfiguration
    .MinimumLevel.Override("Microsoft.AspNetCore", LogEventLevel.Error)

也试过在Azure传送门-function配置中直接设置环境变量，也没用。 好像设置被忽略了。
现在已经大约 2 天了，我正在寻找一个没有运气的解决方案。 我看到了 github 问题、Microsoft 学习文档以及一些问答和博客，但这些似乎都不起作用。

有人有Azure Function in isolated mode的解决方案吗（不是应用程序服务，不是 asp.net 核心）？

Answer 1

• 在这里您可以使用WriteTo.Conditions有条件地开始记录到接收器。

• 这个WriteTo.Conditions需要两个 arguments，一个与条件相关，另一个与 sink 的分配相关。

• 这里我在Program.cs文件中配置了 serilog

namespace FunctionApp57
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var host = new HostBuilder()
                .ConfigureFunctionsWorkerDefaults()
                .ConfigureServices(s => {
                        var logger = new LoggerConfiguration()
                            .Enrich.FromLogContext()
                            .WriteTo.Conditional(et => {
                                // Condition
                                if (10 == 1)
                                {
                                    return true ; 
                                }
                                else
                                {
                                    return false ; 
                                },
                                // Assignment of Sink
                                wt => wt.Console()
                    })
                .Build();
            host.Run();
        }
    }
}

• 这里的 if 条件返回 false：

• 一旦满足条件，就会记录额外的日志：