Like many people, I use a Zabbix system to monitor my servers. If there's a problem with one of my servers, Zabbix will send a message to the email address of my choosing. (Many - most? - monitoring systems work this way.)
When an alert happens, I'd like to have my phone wake me up with a loud sound. But I don't want it to make a loud sound at every email or SMS it receives.
Are other mechanisms available for reliably delivering alerts to mobile devices, which could be configured with a loud, annoying alert tone?