You can see the data that App Center collects by turning on verbose logging as detailed here (note: although this article is specific to React Native, you can use this API for all app platforms). Then, look at the HTTP logs which contain headers and JSON payload to see the data type. 

For HockeyApp and App Center SxS users, here is the data that HockeyApp collects.

If you have any additional/specific questions on the data, feel free to message us in the blue  chat button at the bottom right of the screen.

Let's stay compliant!