collect

Synchronous method used to collect profiling information, which is then sent in a subsequent web request.
It is recommended that you provide this in a header, 'Dwn-Profiling', if using the edge, however if not using the edge you may attach it through any means necessary and provide it in your backend call.
collect() is intended to be called after start() has been invoked, and no content will be returned if it has not.