Activity Streams for Bitbucket Server provides 4 types of activity streams to keep you up-to-date about the activities that happen in your Bitbucket Server repositories:
Repository activity stream
Keeps you up-to-date about all activities that happen in a repository like pushes, forks, clones, pull request actions, commit comments and more. You can find it under the activity stream icon on the left repository icon bar:
Global activity stream
Contains all activities across all repositories of your Bitbucket Server instance. Can be found under the Bitbucket top menu entry "Latest Activities":
User activity stream
Contains all activities of a particular Bitbucket Server user. Can be found under the user profile in the tab "Latest Activities":
Project activity stream
Shows all activities across all repositories of a particular project. You can find it under the activity stream icon on the left project icon bar.