Atlas serves over 160 active customers in hundreds of rooms and listens for almost 15000 subscribed events and it keeps growing :).

Atlas can notify your room or private chat:

On new pull requests, its approvals end merges.
On pipeline builds.
On branch changes.
On comments.
For a quick start just mention the bot (by typing @Atlas) in any of your room or chat him privately.

This is a start, because Atlas will eventually integrate with Jira Cloud and then with Jira and Bitbucket server editions. Having one bot for all your tools will enable new possibilities like advanced threading or grouping notifications!