Hi,

I am using TelemetryClient for adding correlation between 2 azure functions communicating with each other using Azure Event Grid. Unlike the Service Bus, the end-to-end transactions don't appear on the logs out of the box with the Event Grid, so I am using the telemetry client to create custom dependency and requests.

However, I am having a problem here.

• When I am injecting the TelemetryConfiguration into my function, it is completely empty.
• When I am injecting the IOptions<TelemetryConfiguration> to my function, the TelemetryConfiguration is there but missing the actual config, even the instrumentation key.
• When I am injecting my customized TelemetryConfiguration as below, it works but the end-to-end transaction logs get weird and loses significant correlations in the logs:

return services
    .AddSingleton(sp =>
    {
        var telemetryConfiguration = TelemetryConfiguration.CreateDefault();
        telemetryConfiguration.TelemetryInitializers.Add(new OperationCorrelationTelemetryInitializer());
        var config = sp.GetService<IConfiguration>();
        var instrumentationKey = config.GetValue<string?>("APPINSIGHTS_INSTRUMENTATIONKEY");
        if (instrumentationKey != null)
            telemetryConfiguration.InstrumentationKey = instrumentationKey;
        return telemetryConfiguration;
    });

However, when using the deprecated TelemetryConfiguration.Active it works perfectly. I noticed the Active config has more initializers in addition to the OperationCorrelationTelemetryInitializer, namely speaking:

• Microsoft.Azure.WebJobs.Logging.ApplicationInsights.WebJobsRoleEnvironmentTelemetryInitializer
• Microsoft.Azure.WebJobs.Logging.ApplicationInsights.WebJobsTelemetryInitializer

Not sure if that is the reason, but I couldn't find any good documentation or solution for this! Is there an alternative solution to make this work like the TelemetryConfiguration.Active?