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The Prometheus Node Exporter is a core system-level exporter that exposes hardware and operating system metrics from *nix-based hosts. It collects metrics such as CPU usage, memory, disk I/O, filesystem space, network statistics, and load averages. It runs as a lightweight daemon on each host and exposes metrics via an HTTP endpoint (default: :9100/metrics), which Prometheus scrapes periodically. Key clarification: It does not instrument applications (A). It does not collect metrics directly from application HTTP endpoints (B). It is unrelated to HTTP probing tasks - those are handled by the Blackbox Exporter (D). Thus, the correct use of the Node Exporter is to collect and expose hardware and OS-level metrics for Prometheus monitoring. Reference: Extracted and verified from Prometheus documentation - Node Exporter Overview, Host-Level Monitoring, and Exporter Usage Best Practices sections.
