Add support for HTTP trace context transfer during a http redirect

[dmitriyse]

DotNet supports trace-context transfer through headers in the HTTP communication.
But when HTTP redirect occurs, the trace context information lost.
Currently, the W3C standard does not cover this case also, see: w3c/trace-context#438
But there are not too big amount of possible options.

Until HttpClients will start to support trace context headers preserving during HTTP redirects (which might never happen), query string can be used as a transport.

1. W3C should standardize the query string parameter names, for example (they should not interfere with app-specific names and be short):

• _tc_tid
• _tc_pid
• etc

2. Asp.Net Core middleware that currently responsible for the Activity creation should also take into account the query string (not only headers)
3. Microsoft.Extensions.Http library should be improved to instrument HttpClient if this feature is turned on.
4. Microsoft.AspNet.TelemetryCorrelation library should be extended Feature Request: Add support for the query-string tracing context transport (to support http redirects). aspnet/Microsoft.AspNet.TelemetryCorrelation#78
5. Until W3C introduces the names for the query string parameter names they should be configurable in all the above implementations.

[jkotalik]

cc @davidfowl @shirhatti

[BrennanConroy]

Triage: We will not support the query-string feature at this time.

We should verify our redirect behavior on the client though.

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.

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