Allow control over Activity creation

[shirhatti]

Is your feature request related to a problem? Please describe.

It is currently not possible to override (or suppress) creation of a new System.Diagnostics.Activity since it happens as a part of hosting.

Describe the solution you'd like

We should move Activity creation from hosting into a new middleware

Additional context

Customer quote:

Our service is in the middle of a bunch of other services which all use a Http header, x-ms-correlation-id with the value being a Guid formatted with dashes, to pass correlation for aligning traces and logs. I want to just reuse their Id without my developers having to even care, but if I let ASP.NET do its magic, there is no incoming traceparent header so a new activity is created from scratch (not calling SetParentId beforehand). This means and I have to do a bunch of gymnastics to grab x-ms-correlation-id and attach it as baggage and ensure I log it as well with everything (so now I have 2 “traceids”). I just want to be able to reuse an incoming traceid/guid and let Activity do all the hard work propagating and adding to logs.

[BrennanConroy]

Triage: We would lose the activity on start/stop if it was moved out of hosting. We can consider adding options/methods in hosting to allow customization of this.

cc @noahfalk

Thanks for contacting us.
We're moving this issue to the Next sprint planning milestone for future evaluation / consideration. We will evaluate the request when we are planning the work for the next milestone. To learn more about what to expect next and how this issue will be handled you can read more about our triage process here.

[shirhatti]

@cijothomas let's setup a design meeting for this