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Learn to build a custom Grafana monitoring dashboard for OPNSense firewalls from scratch in this comprehensive 37-minute tutorial. Master PromQL fundamentals including the differences between counters and gauges, then create stunning visualization panels for monitoring CPU usage, memory consumption, disk utilization, network traffic, and firewall statistics. Discover how to implement Grafana variables for dynamic dashboards, utilize aggregation functions for data analysis, and apply proper units and overrides for professional-looking displays. Explore advanced techniques including multiple queries, data summarization and filtering, multi-select variables, and table creation. Perfect for network administrators and monitoring enthusiasts who want to move beyond pre-built dashboards and understand the complete process of crafting custom queries and visualizations tailored to their specific OPNSense monitoring needs.
