使用 Telemetry Client 的 App Insights 中未显示自定义指标

Question

My application is an ASP.NET Core 6 application. I am using Telemetry client of Application Insights and calling GetMetric to log custom metrics in the Azure Portal.

I am using Microsoft.ApplicationInsights.AspNetCore version 2.21.0

The Telemetry Client is injected using a constructor:

public RaftService (ILogger<RaftService> logger,
                    IHttpClientFactory clientFactory,
                    IOptions<RaftOptions> raftOptions,
                    IOrderNoteService orderNoteService,
                    TelemetryClient telemetryClient)
{
    _logger = logger;
    _clientFactory = clientFactory;
    _options = raftOptions;
    _orderNoteService = orderNoteService;
    _telemetryClient = telemetryClient;
}

I call the GetMetric and TrackValue methods as follows:

var _paymentAPIStatusCodeMetric = _telemetryClient.GetMetric("PaymentAPIStatusCode");
_paymentAPIStatusCodeMetric.TrackValue(Convert.ToInt32(response.StatusCode));

I am specifying the connection string in my appsettings.json file like this:

When I run the application locally in VS 2022, I can see the metrics getting logged. My TelemetryClient object looks as follows. I see the instrumentation key is assigned and the connection string is populated.:

When I deploy my application as an App Service, custom metrics do not get logged. My TelemetryClient object looks as follows - the instrumentation key is not getting populated in the TelemetryConfiguration for some reason and the DisableTelemetry is showing as true.

Any idea why the Instrumentation Key = "" and DisableTelemetry = true when running the application as an App Service in Azure?

I am guessing, since the instrumentation Key is not set, custom metrics are not getting logged in Azure Portal.

Any help is much appreciated.

Answer 1

Please change your code like below.

public class RaftService: IDisposable
{
    private readonly TelemetryClient _tc;
    private readonly Stopwatch _sw = new Stopwatch();
    private readonly string _operationName;
    
    public RaftService(TelemetryClient tc, string operationName,ILogger<RaftService> logger,
                IHttpClientFactory clientFactory,
                IOptions<RaftOptions> raftOptions,
                IOrderNoteService orderNoteService)
    {
        _tc = tc;
        _operationName = operationName;
        _logger = logger;
        _clientFactory = clientFactory;
        _options = raftOptions;
        _orderNoteService = orderNoteService;
        _sw.Start();
    }
    
    public void Dispose()
    {
        _sw.Stop();
        _tc.GetMetric(_operationName).TrackValue(_sw.ElapsedMilliseconds);
    }
}

Then you can call it.

using(new RaftService(tc, "metricName"))
{
    // 
}

Finally, you can check the logs.