First outage notice
When to use: Use it the moment an incident is confirmed and chats start arriving.
Response
Hi customer name -- you are right, and thanks for flagging it. We have confirmed an issue with affected feature and our engineering team is on it right now.
working feature is unaffected, so you can keep working there in the meantime.
I will come back to you by next update with a real update, even if it is just to say we are still working. You can also follow along at status page.
Why it works
It confirms rather than deflects, scopes the blast radius so the customer knows what they can still do, and commits to a specific next update -- which is what stops someone asking every ten minutes.