He wasn't doing regular, detailed canaries.

He got a warrant.

That month he started doing them. He did that month's and last months together, so it read something like:

Last month we received the following warrants:
Warrant type 1: 0
Warrant type 2: 0
Warrant type 3: 0

This month we received the following warrants:
Warrant type 1: 0

Warrant type 3: 0

Then he made a big announcement post on his forum telling everyone they should definitely read the warrant and within the first page of discussion someone had explained what it meant.