Did you received a Windows configuration update for Windows 11 on September 13th 2023 or so? I noticed this on 3 of my Windows 11 22H2 computers. This one was weird, typically there is a request for reboot based on a KB and lets you know. This one had no information regarding what it was related to.
Looking at my Windows update history (Search for Update History on your search bar), it is likely KB5030219 or KB5031217 . If you click on those links, it will direct you to the Microsoft KB and details as to what it likely was related to.
Let me know if I am wrong, but I am guessing this is likely what that meant.