We show a notification when someone is actively editing a card that you have open: https://help.trello.com/article/784-editing-cards
Outside of that, there's no larger activity notification, I'm afraid! I'll make sure the team knows this is something you'd like to see in the future!
Hello Community! My name is Brittany Joiner and I am a Trello enthusiast and Atlassian Community Leader. I'll be sharing with you a series of videos with my top tips on how to best use Trello...
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