What are the rules / guardrails for Asana Goal Notifications?

I’ve tried searching the documentation but I don’t see a definitive list anywhere.

Specifically I’m wondering:

  1. What causes someone to no longer receive goal notifications? (Is it turning off “Weekly Reports” in Email Settings?)
  2. Can goal notifications be received via Slack or are they only sent through email?
  3. If I want a public goal and everyone on my team to be notified about the goal, what are my options? Do I have to individually add everyone on the team to the goal?