For many Drupal 8 projects that have minimal interaction with their users, the need to set up a notification system quickly comes to the forefront. Being notified of a new comment, a response to a comment, a new publication on a particular subject, or a user, are recurring needs. To satisfy this type of need, we are going to talk here about a new module Entity Activity whose sole purpose is to log all types of actions performed, by users, according to their subscriptions, on a project. The Entity Activity module will allow us to generate any type of message, on any type of content entity on the tree main operations of the content life cycle: its creation, its update and its deletion.