It's up to the janitor, but we generally like to see an overwhelming majority to mess with what the poster wrote.

(The exception is with considerations where reaping is the action indicated. Reaping can only be performed by the NodeReaper, who has a very specific criteria (IIRC, no more then 2 keeps, and at least 5 reaps, but that's off the top of my head, and may change anyway). If it doesn't get to those numbers, it can still be performed directly by a god.)