init: 클린 아키텍처 백엔드

2026-07-24 14:29:36 +09:00
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+---
+title: Runbook — CACHE_UNAVAILABLE (캐시 연결 불가)
+category: TRANSIENT_DEPENDENCY
+error_codes: [CACHE_UNAVAILABLE]
+severity: P1
+owner: oncall
+last_updated: 2026-06-15
+status: stub
+---
+
+# Runbook: CACHE_UNAVAILABLE (`runbook://cache/unavailable`)
+
+## Symptoms
+
+- HTTP 503 with `error.code=CACHE_UNAVAILABLE`
+- Redis connection errors in logs
+
+## Diagnosis
+
+- Check Redis cluster health
+- Verify network connectivity from app to Redis
+
+## Action
+
+- Check Redis sentinel/cluster status
+- Enable cache degradation path if configured for optional caches
+
+## Escalation
+
+- P1 if required cache is down and no degradation path exists
+
+---
+
+> **Stub**: Phase D2 — author body after domain adoption. (feature-operational-runbook-contract D9)