FYI to anybody using OMS or similar tools with Event Log monitoring, you may see new undocumented event IDs due to the change that David mentioned above. They come from a script introduced in 113 called "ApplyWindowsUpdatePolicy.ps1" which runs on logon. Event ID 1009 is informational, 1010 is a warning and 1011 is an error.
You'll see 1009 everytime this script runs, either "Found Existing Registry::HKLM\SOFTWARE\Microsoft\WindowsUpdate\UX\Settings" or "Did not find existing Registry::HKLM\SOFTWARE\Microsoft\WindowsUpdate\UX\Settings. Creating a new one." The actual Windows Update options being changed are the branch readiness level, it is set to CBB and defer feature updates is set.
Ideally this page should be updated https://docs.microsoft.com/en-us/skypeforbusiness/manage/skype-room-systems-v2/oms