feat(monitoring): add grafana, prometheus, node_exporter roles

- grafana: postgres backend, provisioning (prometheus datasource + node/NUT dashboards) - prometheus: native service, scrape config via host_vars, localhost bind - node_exporter: host metrics exporter (localhost:9100)
2026-09-05 17:24:08 +02:00
parent b94743567f
commit 12b81919c3
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+# node_exporter — Prometheus exporter for host metrics
+
+Exposes machine metrics (CPU, memory, disk, filesystem, network) for Prometheus.
+
+## Supported distributions
+
+- Arch Linux (package `prometheus-node-exporter`, extra repo)
+- Debian/Ubuntu (package `prometheus-node-exporter`)
+
+## Configuration
+
+See [defaults/main.yml](defaults/main.yml).
+
+Optional:
+
+```yaml
+node_exporter_listen_address: "127.0.0.1:9100"
+```
+
+Keep localhost-only — Prometheus scrapes it locally on the same host. To add
+collectors (e.g. `--collector.systemd`, `--collector.textfile.directory`), extend
+`node_exporter_listen_address` or override the args in host_vars.
+
+## Pairing with Prometheus
+
+```yaml
+prometheus_scrape_configs:
+  - job_name: 'node'
+    static_configs:
+      - targets: ['localhost:9100']
+```
+
+## Operations
+
+```bash
+systemctl status prometheus-node-exporter
+curl -s http://127.0.0.1:9100/metrics | head
+journalctl -u prometheus-node-exporter -f
+```
+
+## Dependencies
+
+None. Standalone exporter.