If telemetry correlation module is not first in the list of modules - correlation doesn't work

[SergeyKanzhelev]

Customer complained that telemetry from BeginRequest or custom IHttpModule wasn't correlated properly. We need to:

• check that xdt will attempt to insert correlation module first in the list.
• can we detect not being the first and report a warning that Application Insights can pick up and report to the customer.

[lmolkova]

Was it implemented in AI already?

[SergeyKanzhelev]

Nope. it doesn't matter much for Application Insights as Request Telemetry will be instantiated and start on the first telemetry item we try to report.

Telemetry Module have to be started before any telemetry.