The system overlay through which Milk reads warnings, checks the floor, and identifies the intruders.
Milk pulls up her interface twice in the chapter — once to confirm this is only the fifth floor of Club Vanquisher, and once to check that the creatures screaming in the hallway are not escaped demons but two crawlers and a hellspawn pet. The same interface delivers her Starvation Warning in blinking form and, later, the Unauthorized Information Warning when she starts telling the crawlers how the guards operate. Notably, she has muted only the broadcast announcements, via her Announcement Muting Scroll; the enforcement layer still reaches her fine.
The system layer through which the dungeon warns, informs, and polices Milk.