Attempt to migrate App Insights TrackEvent logic to OpenTelemetry isn't sending data

[RickKra]

I am attempting to migrate a .NET console app that is using the Application Insights SDK to TrackEvent some data (which shows up in my App Insights instance as a customEvent) to OpenTelemetry. IIUC the closest thing to TrackEvent in OpenTelemetry is the Trace signal.

This is what I did before:

public static void SendTelemetry(TelemetryEvent e)
{
    var client = CreateAppInsightsTelemetryClient(e.InstrumentationKey);
    client.TrackEvent(e.EventName, e.Properties, e.Metrics);
    client.Flush();
    Task.Delay(1000).Wait(); // Allow time for flushing
}

Here's what I'm trying now:

public static void SendTelemetry(TelemetryEvent e)
{
    var source = new ActivitySource("Engineering.Telemetry");

    using (Sdk.CreateTracerProviderBuilder()
        .AddAzureMonitorTraceExporter(o => o.ConnectionString = $"InstrumentationKey={e.InstrumentationKey}")
        .AddSource(source.Name)
        .Build())
    {
        using (var activity = source.StartActivity(e.EventName, ActivityKind.Internal))
        {
            foreach (var property in e.Properties)
            {
                activity.SetTag(property.Key, property.Value);
            }

            foreach (var metric in e.Metrics)
            {
                activity.SetTag(metric.Key, metric.Value);
            }
        }
    }
}

But when I run the code nothing appears to be sent. I've checked both customEvents and traces and neither has new data.

The Instrumentation key in TelemetryEvent is correct for my App Insights resource and works fine with the old code. I've also tried replacing that InstrumentationKey={e.InstrumentationKey} string with the Connection String value that you get from the App Insights portal--no luck with that either.

What am I doing wrong?