I want to add a notification in the admin interface that tells users “plugin activated” for example, but I don’t know which action hook should I use, knowing that I want the message to display not just in the dashboard page, but in all the admin interface pages, like Dashboard, Appearance, Settings…etc, and I want the message to be under the first title of that page, like for example, if we are under Dashboard page, my plugin message should be under the title “Dashboard”, if we are under Plugins page, my plugin message should be under the title “Plugins”…etc

Is there any body that can help with this please ?

Thanks.