为什么我看不到任何日志条目，但仍然可以在 Application Insights 中看到实时指标的变化？

Question

我按照这个微软教程来实现应用程序我将用作网络作业的控制台应用程序的洞察日志记录。我的代码有几个问题。

using Microsoft.ApplicationInsights;
using Microsoft.ApplicationInsights.DataContracts;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using System;
using System.Threading.Tasks;

namespace ConsoleApp5
{
    class Program
    {
        public static void Main(string[] args)
        {
            IServiceCollection services = new ServiceCollection();

            // Being a regular console app, there is no appsettings.json or configuration providers enabled by default.
            // Hence instrumentation key and any changes to default logging level must be specified here.
            services.AddLogging(loggingBuilder => loggingBuilder.AddFilter<Microsoft.Extensions.Logging.ApplicationInsights.ApplicationInsightsLoggerProvider>("Category", LogLevel.Trace));
            services.AddApplicationInsightsTelemetryWorkerService("xyz-xzy-xyz-xyz-xyz");

            // Build ServiceProvider.
            IServiceProvider serviceProvider = services.BuildServiceProvider();

            // Obtain logger instance from DI.
            ILogger<Program> logger = serviceProvider.GetRequiredService<ILogger<Program>>();

            // Obtain TelemetryClient instance from DI, for additional manual tracking or to flush.
            var telemetryClient = serviceProvider.GetRequiredService<TelemetryClient>();

            int i = 0;
            
            while (true) // This app runs indefinitely. replace with actual application termination logic.
            {
                
                // Replace with a name which makes sense for this operation.
                using (telemetryClient.StartOperation<RequestTelemetry>("operation"))
                {
                    telemetryClient.TrackTrace("VS This is tracktrace from telemetry" + i);//
                    logger.LogWarning("VS Logger.logWarning" + i);//
                    logger.LogInformation("VS logger.LogInformation" + i);
                    logger.LogTrace("VS logger.LogTrace" + i);
                    logger.LogError("VS logger.LogError" + i);//
                    logger.LogDebug("VS logger.LogDebug" + i);
                    logger.LogCritical("VS logger.LogCritical" + i);//
                    telemetryClient.Flush();
                    Task.Delay(5000).Wait();
                }
                i = i + 1;
            }
        }
    }
}

首先，我收到实时指标日志，如下面的屏幕截图所示：

但是当我在日志中运行traces命令时，它没有显示任何内容，如下所示：

其次，为什么我没有看到 logger.LogInformation、logger.LogTrace 和 logger.LogDebug 的任何日志？我已将日志级别设置为跟踪（LogLevel.Trace）。

顺便说一句，我在最后使用 Task.Delay(5000).Wait(); 以确保所有日志都刷新到我的 Application Insight。这对于生产环境来说也是正确的方法吗？

Answer 1

• 首先检查以下几点

1. 检查您选择的时间范围
2. 重新部署您的应用程序。
3. 如果它仍然不起作用，请检查下面提到的代码。

• 在我的本地环境中进行测试后，请找到下面的代码，它将为您提供实时指标以及来自跟踪的数据

using Microsoft.ApplicationInsights;
using Microsoft.ApplicationInsights.DataContracts;
using Microsoft.ApplicationInsights.WorkerService;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using System;
using System.Diagnostics;
using System.Threading;
using System.Threading.Tasks;

namespace appinsightsinwebjob
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Stopwatch stoptwatch = new Stopwatch();
            stoptwatch.Start();
            IServiceCollection services = new ServiceCollection();
            //var aiOptions = new ApplicationInsightsServiceOptions();
            // Being a regular console app, there is no appsettings.json or configuration providers enabled by default.
            // Hence instrumentation key and any changes to default logging level must be specified here.
            services.AddLogging(loggingBuilder => loggingBuilder.AddFilter<Microsoft.Extensions.Logging.ApplicationInsights.ApplicationInsightsLoggerProvider>("", LogLevel.Trace));
            services.AddApplicationInsightsTelemetryWorkerService("5164e66d-fe14-403e-bc2f-6247ebedeb38");
            //services.AddApplicationInsightsTelemetryWorkerService(aiOptions);
            // Build ServiceProvider.
            IServiceProvider serviceProvider = services.BuildServiceProvider();

            // Obtain logger instance from DI.
            ILogger<Program> logger = serviceProvider.GetRequiredService<ILogger<Program>>();

            // Obtain TelemetryClient instance from DI, for additional manual tracking or to flush.
            var telemetryClient = serviceProvider.GetRequiredService<TelemetryClient>();

            int i = 0, j = 5;
            for (i = 0; i < j; i++)
            {
                // Replace with a name which makes sense for this operation.
                using (telemetryClient.StartOperation<RequestTelemetry>(""))
                {
                    telemetryClient.TrackTrace("VS OK This is tracktrace from telemetry" + i);//
                    logger.LogWarning("VS OK Logger.logWarning" + i);//
                    logger.LogInformation("VS OK logger.LogInformation" + i);
                    logger.LogTrace("VS OK logger.LogTrace" + i);
                    logger.LogError("VS OK logger.LogError" + i);//
                    logger.LogDebug("VS OK logger.LogDebug" + i);
                    logger.LogCritical("VS OK logger.LogCritical" + i);//
                    telemetryClient.Flush();
                    Thread.Sleep(5000);
                }
            }

        }

这是跟踪输出

• 是的，你可以 Task.Delay(5000).Wait( ); 生产环境中的命令甚至我的代码中使用的延迟命令。