"I compiled a simple program with only main(). When looking at the compiled binary in Ida, I see a calls for telemetry_main_invoke_trigger and telemetry_main_return_trigger. I can not find documentation for these calls, either on the web or in the options page."
Only after the discovery did Steve Carroll, the dev manager for Visual C++, admit to the feature and posted a work around. The "feature" is to be removed in Update 3 of the product.