steve
73e733be61
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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.