I’ve run Zabbix with thousands of monitored hosts. It’s not perfect, and it requires some bending to just how Zabbix wants things done, but it’s nice. We have

I’ve run Zabbix with thousands of monitored hosts. It’s not perfect, and it requires some bending to just how Zabbix wants things done, but it’s nice. We have it monitoring all manner of stuff, hardware, power, cooling, services, batteries, weather, network, disks, etc