@stephenw10 I use Zabbix , and like it. Note The zabbix DB loves to be on a SSD, especially when doing "cleanup tasks". My install (Debian VM) with around 100 monitor points - takes up 20GB diskspace including OS. Here's linux install guide(s) https://www.tecmint.com/install-and-configure-zabbix-monitoring-on-debian-centos-rhel/ https://www.tecmint.com/configure-zabbix-to-send-email-alerts-to-gmail/ https://www.tecmint.com/install-and-configure-zabbix-agents-on-centos-redhat-and-debian/ https://www.tecmint.com/install-zabbix-agent-and-add-windows-host-to-zabbix-monioring/ I used this one , back in time. https://www.tecmint.com/install-zabbix-on-debian-10/