What's Monitored

Active Users
Uptime
CPU Load total
Disk Utilization
Memory Utilization
CPU Utilization per core (Single Graph)
Ram Utilization time graph
Load Average
Load Average Graph
CPU and ACPI Temperature Sensors
Gateway Response time - dpinger
List of interfaces with IPv4, IPv6, Subnet, MAC, Status and pfSense labels thanks to /u/trumee
WAN Statistics - Traffic & Throughput (Identified by dashboard variable)
LAN Statistics - Traffic & Throughput (Identified by dashboard variable)
Firewall Statistics - Blocked Ports, Protocols, Events, Blocked IP Locations, and Top Blocked IP

Changelog

Converted InfluxQL queries to Flux.

Converted pfSense functions to OPNsense.

Added Firewall panels.

Added subnet info to Interface Summary panels

Added Suricata dashboard, see instructions here

Added RFC5424 support thanks to subract

Grafana 9.2.10
InfluxDB 2.6.1
Graylog 5.0.2

Configuration instructions can be found here.