Solution/App for Office 365 Activity Stream - Feed - Hub

Hello, I am looking for a solution or an app to have a global activity stream throughout Office 365. Has anybody realized somthing like this or knows, if Microsoft has any plans to develop one?

Activities could be:

• @mentions from different apps (Yammer, Teams, Outlook, Planner, ...)
• new comments/likes
• Shared sites and documents
• new assigned tasks in Planner
• new Group/Team invitations
• new team news from followed team sites
• new videos from followed Stream channels
• activities from third party tools
• ....

Currently you can only get email notifications if an activity occurs or you have to go in the app directly to see what's going on. Any ideas on that? I appreciate your help!