@gas85 you are wrong. The functionality of Activity Log has not been incorporated into Activity. Where is the field to choose the timeframe, the user, the action? How on earth do you think otherwise?
Also, please note that Activity Log allows the user to see data from every other user, therefore only admins should be allowed to use this app. Activating the app without restricting it to the grouip admin is a very, very bad idea.
Anyway, the app is dead. So whoever decides to create a new version of it should take this into consideration. The app must only be allowed to be run as an administrator, otherwise the privacy of others is compromised.