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exporters/node-exporter.md

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+# Node Exporter
+
+## Purpose
+
+Node Exporter exposes Linux system metrics to Prometheus.
+
+It is used to monitor:
+
+- CPU usage
+- Memory usage
+- Disk usage
+- Network traffic
+- Filesystem usage
+- System load
+
+---
+
+## Install Node Exporter on Debian/Ubuntu
+
+```bash
+sudo apt update
+sudo apt install prometheus-node-exporter -y