I think Zabbix can do what you want with trigger dependencies. https://www.zabbix.com/documentation/1.8/manual/config/host_and_trigger_dependencies https://www

I think Zabbix can do what you want with trigger dependencies. https://www.zabbix.com/documentation/1.8/manual/config/host_and_trigger_dependencies https://www.zabbix.com/documentation/1.8/manual/config/host_... Though I'm not sure about the "warning if there are less than 3 ways for more than an hour" requirement.