Nope. I have moved away several years ago from pfsense and could not be happier. I am running production off a 2 node, 24 vlan cluster and it’s rock solid

Never? Only when they need physical maintenance

Nagios for service/QOS, Grafana for dashboarding for some items more specific. Planning on eventually switching to zabbix but nagios is so simple that i feel having a hard time justifying moving over 400 monitored services to it