What's installed and what's running as well. Possibly system information (Capabilities of your device?).
The worrying part is that there's no way to shut this off, even in the registry or attempting to stop/uninstall services.
- Basic
Basic information is data that is vital to the operation of Windows. This data helps keep Windows and apps running properly by letting Microsoft know the capabilities of your device, what is installed, and whether Windows is operating correctly. This option also turns on basic error reporting back to Microsoft. If you select this option, we'll be able to provide updates to Windows (through Windows Update, including malicious software protection by the Malicious Software Removal Tool), but some apps and features may not work correctly or at all.