Telemtery Converter Was Not Found Error

Introduction

The “Telemetry Converter Was Not Found” error typically occurs when using Application Insights or similar telemetry services in your .NET application and there is an issue with the telemetry data being sent. It might be due to a misconfiguration or an incorrect setup. Here’s an example of how you might configure Application Insights in an ASP.NET Core application and handle telemetry data:

Step 1: Install Application Insights NuGet Package

In your ASP.NET Core project, install the Microsoft.ApplicationInsights.AspNetCore NuGet package:

dotnet add package Microsoft.ApplicationInsights.AspNetCore

Step 2: Configure Application Insights

In your Startup.cs class, you can configure Application Insights:

using Microsoft.ApplicationInsights.Extensibility;

// ...

public void ConfigureServices(IServiceCollection services)
{
    // ...
    services.AddApplicationInsightsTelemetry(Configuration["ApplicationInsights:InstrumentationKey"]);
}

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    // ...
    app.UseApplicationInsightsRequestTelemetry();
    app.UseApplicationInsightsExceptionTelemetry();
    // ...
}

Make sure you have your InstrumentationKey properly configured in your appsettings.json:

{
  "ApplicationInsights": {
    "InstrumentationKey": "your-instrumentation-key"
  },
  // ...
}

Step 3: Handling Telemetry Data

In your application, you can use telemetry to track various events, dependencies, exceptions, and more. Here’s an example of sending custom telemetry:

using Microsoft.ApplicationInsights;

public class YourService
{
    private readonly TelemetryClient _telemetryClient;

    public YourService(TelemetryClient telemetryClient)
    {
        _telemetryClient = telemetryClient;
    }

    public void SomeMethod()
    {
        // Example of tracking a custom event
        _telemetryClient.TrackEvent("CustomEvent", new Dictionary<string, string>
        {
            { "EventName", "YourEventName" }
        });

        // ... Your method logic ...
    }
}

Troubleshooting the Error:

If you encounter the “Telemetry Converter Was Not Found” error, it could be due to a few reasons:

1. Configuration Issue: Ensure your InstrumentationKey is correctly set in your appsettings.json. An incorrect or missing InstrumentationKey can lead to telemetry issues.
2. Dependency Injection: Make sure you’re correctly injecting TelemetryClient where needed. Ensure that your service or class has the necessary DI configuration to receive the TelemetryClient.
3. Mismatched Dependencies: Ensure that you’re using compatible versions of the Microsoft.ApplicationInsights.AspNetCore NuGet package and other related dependencies.
4. Instrumentation in Unsupported Environment: Ensure that you’re using Application Insights in a supported environment. For example, if you’re trying to use it in a non-HTTP application (e.g., a console application), the setup might be different.

If you’re still facing issues, you might need to provide more specific details about your configuration and how you’re using telemetry in your application for further assistance.