Node Exporter Type: Metrics Collection Agent Role: Node Exporter is a lightweight instrumentation agent that exposes host-level metrics in Prometheus format. Metrics exposed include: • CPU load and saturation • Memory usage and swap activity • Filesystem and disk IO performance • Network throughput and error counters • Temperature metrics (especially relevant on Pi boards) Architectural position: • Deployed on each node (Dell server and all Raspberry Pis). • Feeds metrics directly to Grafana if using Grafana’s built-in Prometheus data source OR via Prometheus if added later. • Forms the foundational telemetry layer in your observability stack.