ArcGIS Monitor notification emails indicate that one should contact an administrator to configure Monitor notifications in order to receive less emails.

I would like to receive only "critical" alerts notifications, but notifications are configured at counter level, I can see anywhere one can tune notification according alert criticity there :

This is neither in the smtp configuration :

Nor in official documentation :
Configure alerts for counters—ArcGIS Monitor | Documentation d’ArcGIS Enterprise
Please, kindly let me know where I can configure notifications base on alert criticity