chore: initialize from backend template 0a6dd0e

2026-08-13 20:31:02 +09:00
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+---
+title: Runbook — CACHE_STAMPEDE_LOCK_TIMEOUT (캐시 스탬피드 락 타임아웃)
+category: TRANSIENT_DEPENDENCY
+error_codes: [CACHE_STAMPEDE_LOCK_TIMEOUT]
+severity: P2
+owner: oncall
+last_updated: 2026-06-15
+status: stub
+---
+
+# Runbook: CACHE_STAMPEDE_LOCK_TIMEOUT (`runbook://cache/stampede-lock-timeout`)
+
+## Symptoms
+
+- HTTP 503 with `error.code=CACHE_STAMPEDE_LOCK_TIMEOUT`
+- Multiple concurrent cache misses on same key; lock contention
+
+## Diagnosis
+
+- Check cache hit ratio metrics
+- Identify cache keys with high miss rates
+
+## Action
+
+- Verify stampede lock TTL is configured appropriately
+- Pre-warm cache for high-traffic keys on startup
+
+## Escalation
+
+- Escalate if backend load spike accompanies stampede
+
+---
+
+> **Stub**: Phase D2 — author body after domain adoption. (feature-operational-runbook-contract D9)