OpenTelemetrySdk not defined with TelemetryClient using DI when calling flushAsync

[andrkn]

• List of NuGet packages and version that you are using:

<PackageReference Include="Microsoft.ApplicationInsights.WorkerService" Version="3.0.0" />

• Runtime version (e.g. net461, net48, netcoreapp2.1, netcoreapp3.1, etc. You can find this information from the *.csproj file):
• Hosting environment (e.g. Azure Web App, App Service on Linux, Windows, Ubuntu, etc.):

net10.0, windows

Describe the bug

In my WorkerService I have an issue when trying to use telemetryClient.Flush/FlushAsync when doing shutdown of the service. It crashes as private OpenTelemetrySdk sdk; is null within my TelemetryClient.
Exception from TelemetryClient: System.NullReferenceException: 'Object reference not set to an instance of an object.',

To Reproduce

Attached code should reproduce my issue with using TelemetryClient.FlushAsync

TestWorker.zip

[rajkumar-rangaraj]

@andrkn Thanks for reporting this.

We’ve identified the root cause of the issue and confirmed the behavior you’re seeing. We’ll address this with a fix in an upcoming update.