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Legitimately useful. As someone working remotely I'm always wary of waking US colleagues up with my unimportant notifications.

I'd definitely use a '% of team members online' Slackbot

If you have notifications configured in a way that wakes you up, that's your fault.

Slack lets you mute notifications.

> I'm always wary of waking US colleagues up with my unimportant notifications

Some notifications are important.