TraceContext: TraceParent and TraceState properties are always empty.

[rikbosch]

I'm trying to setup distributed tracing in .NET 5 and as a minimum I would like to see the dependency calls of a .NET 5 worker function call in Application Insights.

I expected the worker to set System.Diagnostics.Activity.Current when processing a function invocation, but that is not the case.
So I wrote a middleware which extracts the TraceParent and TraceState properties into an ActivitySource:

but the TraceContext properties are always empty. I don't know if this is an issue in de worker code, or an issue in the functions host.

[fabiocav]

This is currently a gap that @brettsam has been tracking. We'll have an issue created to track the work, link to it and close this once that is in place.

We'll continue to use this issue to track the work.

Thank you!

[murthys]

I am waiting for the same, when will going to be supported?

[brettsam]

Today you need to have Application Insights enabled for this to work.

The host will eventually move to using the newer OpenTelemetry instrumentation so these traces flow without App Insights, but for now, App Insights is required.

[brettsam]

If you're trying to get this working with Application Insights, try the new preview packages: #944 (comment)

[brettsam]

I've filed Azure/azure-functions-host#8846 to track removing the Application Insights requirement.