ApplicationInsights: "TelemetryChannel found a telemetry item without an InstrumentationKey", but I'm using recommended ConnectionString

Question

.NET6, Microsoft.ApplicationInsights.AspNetCore version 2.21.0

My AppInsights works, but I also have this trace warning in Azure:

AI: TelemetryChannel found a telemetry item without an InstrumentationKey. This is a required field and must be set in either your config file or at application startup.

How to fix it?

I'm using recommended ConnectionString (instead of InstrumentationKey).

My appsettings.json:

"ApplicationInsights": {
    "ConnectionString": "InstrumentationKey=xxxx;IngestionEndpoint=https://yyy.azure.com/;LiveEndpoint=https://zzz.azure.com/",
    "LogLevel": {
        "Default": "Information"
    }
}

My startup.cs:

// AppInsights options
var aiOptions = new Microsoft.ApplicationInsights.AspNetCore.Extensions.ApplicationInsightsServiceOptions
{
    EnableDependencyTrackingTelemetryModule = false,
};

services.AddApplicationInsightsTelemetry(aiOptions);

Answer 1

I have tried to Integrate Application Insights in .NET Core6 Web App using the Application Insights Connection String and able to see the traces without any warnings.

• You are writing the code inStartup.cs, .NET 6 doesn't require Startup.cs file, the code can be configured within the Program.cs file.

• In .NET 6 both Program.cs and Startup.cs configurations are unified into a single file Program.cs.

My appsettings.json

{
  "Logging": {
    "ApplicationInsights": {
      "LogLevel": {
        "Default": "Debug",
        "Microsoft": "Error"
      }
    },
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning"
    }
  },
  "AllowedHosts": "*",
  "ApplicationInsights": {
    "ConnectionString": "InstrumentationKey=****;IngestionEndpoint=https://*****.in.applicationinsights.azure.com/;LiveEndpoint=https://****.livediagnostics.monitor.azure.com/"
  }
}

Program.cs

var builder = WebApplication.CreateBuilder(args);

var aiOptions = new Microsoft.ApplicationInsights.AspNetCore.Extensions.ApplicationInsightsServiceOptions
{
    EnableDependencyTrackingTelemetryModule = false,
};
builder.Services.AddApplicationInsightsTelemetry(aiOptions);
builder.Services.AddControllersWithViews();
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();

Traces for MVC

 public IActionResult Index()
        {
            _logger.LogInformation("Log Information from Controller.");
            _logger.LogDebug("Debug Message from the Controller.");
            _logger.LogWarning("Log Warning.");
            _logger.LogError("Log Error.");
            return View();
        }

Traces for Web App

var app = builder.Build();
ILogger logger = app.Logger;
logger.LogInformation("Test logs");
logger.LogWarning("Iam a Warning Message");

Traces for MVC App

Traces for Web App