I'm not referring to "soft asks". The dark pattern is creating a fake dialog that mimics the real system dialog in order to mislead, and circumvent a feature designed to protect users from spam/abuse.
Telling a user why they're about to get a permissions dialog, and displaying a real system dialog, is obviously not a dark pattern.
They're common as hell, but I can't seem to find a live example of what I'm talking about right now.