---
title: Runbook — DEPENDENCY_CIRCUIT_OPEN (서킷 브레이커 개방)
category: TRANSIENT_DEPENDENCY
error_codes: [DEPENDENCY_CIRCUIT_OPEN]
severity: P2
owner: oncall
last_updated: 2026-06-15
status: stub
---

# Runbook: DEPENDENCY_CIRCUIT_OPEN (`runbook://dependency/circuit-open`)

## Symptoms

- HTTP 503 with `error.code=DEPENDENCY_CIRCUIT_OPEN`
- Circuit breaker (Resilience4j) in OPEN state for a dependency

## Diagnosis

- Check Resilience4j circuit breaker metrics for the dependency
- Check upstream health; circuit opens after failure threshold breached

## Action

- Wait for circuit half-open probe (automatic after wait duration)
- Resolve upstream issue to allow circuit to close

## Escalation

- P1 if circuit remains open > 5 minutes on a critical dependency

---

> **Stub**: Phase D2 — author body after domain adoption. (feature-operational-runbook-contract D9)