Events and Controllers...

Hi everyone,
I like to achieve simply logging the views of my pages in the database. Still learning CI4 though...
I found the Events and was looking at it the whole night. I have a Controller "Statistics" as well as a model. I've read I have to add the full namespace like App\Controllers\Statistics.
But

PHP Code:

Events::on('post_system', ['\App\Controllers\Statistics', 'write']); 


won't work still as it let's me know it isn't called static.

So... any help and/or additional insights how the Events work? I didn't figure it yet, obviously