[Observium] Alert Checker for an "App" (mysql)?

Hello,

I want to create an alert that informs me, when the network traffic on a mysql-database ("Application_mysql_network_traffic") on below a certain treshold. What I really want to see is if the mysqld process is running or not and I try to achieve this by looking at this stat which will be zero when mysqld has been terminated.

I did not find any information on how to create alerts for apps in the official documentation.

Does anyone has a hint for me how to to that?

Many thanks and best regards, Marc