A comprehensive guide to building custom Grafana dashboards for OPNSense firewall monitoring. Covers PromQL fundamentals including metric types (counters, gauges), rate calculations, and label filtering. Demonstrates creating visualizations for system health metrics (CPU, memory, disk), network statistics (interface traffic, firewall rules), and using variables for dynamic filtering. Includes practical examples of complex queries like CPU utilization calculations, data transformations for tables, and panel repetition across multiple interfaces. The tutorial emphasizes hands-on dashboard creation rather than relying on community templates.
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