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Clément Désiles f6c4d36bbe feat(monitoring): add backup and systemd metrics, alerts, and dashboards

- backup role emits last-success/run metrics into node_exporter's textfile collector
- node_exporter enables systemd and textfile collectors
- prometheus deploys BackupStale/BackupTimerSilent/SystemdUnitFailed alert rules
- grafana gains Backups - Restic and Systemd dashboards
- fix prometheus.yml params rendering (quote values so {job=...} stays a string)

2026-09-09 12:07:50 +02:00

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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.

Optional:

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.

Collectors

The role enables, on top of the defaults:

--collector.zfs — ZFS pool/dataset metrics.
--collector.systemd — unit state (node_systemd_unit_state), restart counts (node_systemd_restart_count_total) and timer trigger times (node_systemd_timer_last_trigger_seconds / ..._next_trigger_seconds). Powers the systemd dashboard (failed units, timers that stopped firing).
--collector.textfile.directory={{ node_exporter_textfile_dir }} — re-exposes *.prom files dropped into that directory. The backup role writes backup_* metrics there; other cron/timer jobs can do the same.

Pairing with Prometheus

prometheus_scrape_configs:
  - job_name: 'node'
    static_configs:
      - targets: ['localhost:9100']

Operations

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.

1.6 KiB Raw Blame History