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spec+plan: P6-04/05 prometheus /metrics + Grafana dashboard #22

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steve merged 2 commits from p6-04-05-prometheus-metrics into main 2026-05-08 19:31:59 +01:00
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steve commented 2026-05-08 19:27:40 +01:00
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steve added 2 commits 2026-05-08 19:27:40 +01:00
spec+plan: P6-04/05 prometheus /metrics + Grafana dashboard 70ff554402
P6-04+05: Prometheus /metrics endpoint + Grafana dashboard
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73e733be61 
New internal/server/metrics package emits the legacy text/plain
exposition format directly, so we don't pull in
prometheus/client_golang. Endpoint is opt-in via RM_METRICS_TOKEN
and/or RM_METRICS_TRUSTED_CIDR; route is not mounted at all if
neither gate is set. Both gates ANDed when both configured.

Per-host gauges (online, last_backup_*, repo_size_bytes,
snapshot_count, open_alerts, repo_status), server gauges
(hosts_total/online, active_alerts by severity, build_info), and
an in-memory job-duration histogram observed from the existing
MsgJobFinished branch in the WS handler.

Docs in docs/prometheus.md (enable + scrape config + metric
reference + dashboard import). Sample dashboard at
deploy/grafana/restic-manager-dashboard.json - six panels,
Grafana schema 39, single Prometheus datasource variable.

Tests: golden render, concurrent observe, bucket boundaries in
the metrics package; auth matrix (no auth -> 404, token gate,
CIDR gate, both required) in the HTTP layer.
steve merged commit a252b25854 into main 2026-05-08 19:31:59 +01:00
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Reference: steve/restic-manager#22
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