Application Insights -_logger.LogInformation

Question

I have created a very simple ASP.Net Core application to learn more about Azure Application Insights.

I can log messages through LogWarning, LogError and LogCritical methods to my Azure Application Insights which I able to see when I query traces table under logs. I am having some trouble with LogDebug, LogInformation and LogTrace as I cannot find these messages.

Below is some related code:

builder.Services.AddApplicationInsightsTelemetry();

// Example log level configuration in Startup.cs
builder.Services.AddLogging(builder => builder.SetMinimumLevel(LogLevel.Trace));

Here is my config:

"Logging": {
  "LogLevel": {
    "Default": "Information",
    //Only the WARNING messages for HttpClient will be logged
    "System.Net.Http.HttpClient": "Warning"
  }
}

Answer 1

The issue I am having for LogDebug, LogInformation and LogTrace I cannot find the messages

I have created simple dotnet core web application with .net version 6.0 in visual studio. I was configure application insights in the application by using appinsights connection string.

.cs proj:

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

  <PropertyGroup>
    <TargetFramework>net6.0</TargetFramework>
    <Nullable>enable</Nullable>
    <ImplicitUsings>enable</ImplicitUsings>
  </PropertyGroup>
    <ItemGroup>
        <PackageReference Include="Microsoft.ApplicationInsights.AspNetCore" Version="2.21.0" />
    </ItemGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.ApplicationInsights.WindowsServer.TelemetryChannel" Version="2.22.0" />
  </ItemGroup>
</Project>

program.cs:

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddControllersWithViews();
builder.Services.AddApplicationInsightsTelemetry();
//var abc = builder.Configuration["APPLICATIONINSIGHTS_CONNECTION_STRING"];
var app = builder.Build();
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Home/Error");
    app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();
app.UseAuthorization();
app.MapControllerRoute(
    name: "default",
    pattern: "{controller=Home}/{action=Index}/{id?}");
app.Run();

appsettings.json:

{
  "Logging": {
    "ApplicationInsights": {
      "LogLevel": {
        "Default": "Debug",
        "Microsoft": "Error"
      }
    },
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning"
    }
  },
  "AllowedHosts": "*",
  "ApplicationInsights": {
    "ConnectionString": "Your-application insights-connection string"
  }
}

HomeController.cs:

using appinsightweb.Models;
using Microsoft.AspNetCore.Mvc;
using System.Diagnostics;

namespace appinsightweb.Controllers
{
    public class HomeController : Controller
    {
        private readonly ILogger<HomeController> _logger;

        public HomeController(ILogger<HomeController> logger)
        {
            _logger = logger;
        }

        public IActionResult Index()
        {
            _logger.LogInformation("This is an Information log.");
            _logger.LogWarning("This is a Warning log.");
            _logger.LogError("This is an Error log.");
            _logger.LogCritical("This is a Critical log.");

            // For Debug and Trace logs, ensure that the log level is configured appropriately in Startup.cs

            _logger.LogDebug("This is a Debug log.");
            _logger.LogTrace("This is a Trace log.");
            return View();
        }

By using above code and configuration able to get the different type of logs in application insights. Check below:

Search for "transaction search" in Application Insights.