Kapston 5: hn-notes kuzatuvi, SLO alert, game day va postmortem

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Kapstonning yakuniy bosqichi: ishlab turgan hn-notes'ni kuzatiladigan qilish va birinchi insidentni nazorat ostida o'tkazish — metrikalar shartnomasi va to'rt oltin signal, Prometheus scrape (ilova + node_exporter), 99.9% SLO uchun SLI recording rule'lari va 14.4x multi-window burn rate alert'i, promtool test rules, alerting bloki va Alertmanager marshruti (severity=page → webhook, send_resolved, resolved kechikishi), Grafana datasource va golden signals dashboard'i HTTP API orqali va repoda; ga

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