Can't send customMetrics and customEvents data to Application insights

Question

Application telemetry is my new area. I can't send my custom data to Application insights to query and monitor. I need to send an user ID metrics to application insights who access my web-application written in .NET Core MVC model. I've added a code after referencing from articles out there and from official documentation, once I add these custom Code under my controller the default data that used to send to insights is stopped

I've tried added the following code under a controller. NOTE: This is for testing whether I can able to send metrics of my own. I too added some static data to test.

I've passed the TelemetryClient by DI method

        try
        {
            // Track a custom metric
            telemetryClient.GetMetric("CustomMetricID").TrackValue(userid);
            telemetryClient.GetMetric("TestMetric").TrackValue(1);
            // Set the user and organization IDs
            telemetryClient.Context.User.Id = userid.ToString();

           // Track a custom event
            var customEvent = new EventTelemetry("CustomEvent_UserID");
            customEvent.Properties.Add("Int_USER_ID", userid.ToString());
            customEvent.Properties.Add("Desc", "Working...");
            telemetryClient.TrackEvent(customEvent);
        }
        catch (Exception ex)
        {
            telemetryClient.TrackException(ex);
        }
        finally
        {
            telemetryClient.Flush();
        }

I'm expecting to send my custom data (here USER_ID) to application insights.

Answer 1

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_

• The code which you have configured is correct.

• We need to add the Application Insights ConnectionString/InstrumentationKey in the appsettings.json file.

appsettings.json

{
  "Logging": {
    "ApplicationInsights": {
      "LogLevel": {
        "Default": "Debug",
        "Microsoft": "Error"
      }
    },
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning"
    }
  },
  "AllowedHosts": "*",
  "ApplicationInsights": {   
  "ConnectionString": "InstrumentationKey=56**9q4-****-4**9-8a4f-a******d6a;IngestionEndpoint=https://eastus-8.in.applicationinsights.azure.com/;LiveEndpoint=https://eastus.livediagnostics.monitor.azure.com/"
  }
}

Install the NuGet package Microsoft.ApplicationInsights.AspNetCore.

.csproj file:

<PackageReference  Include="Microsoft.ApplicationInsights.AspNetCore"  Version="2.21.0" />

• Add the below line in Pogram.cs file.

builder.Services.AddApplicationInsightsTelemetry();

• Make sure TelemetryClient is configured correctly with the InstrumentationKey.

• In Controller create an Instance of TelemetryClient .

 public readonly TelemetryClient mytelemetry;

OR

public TelemetryClient mytelemetry = new TelemetryClient();

public MyController(TelemetryClient telemetryClient) 
{
   mytelemetry= telemetryClient; 
}