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Circuit Breaker 패턴의 상태 머신 원리, Resilience4j의 CircuitBreaker·Retry·Bulkhead·RateLimiter 모듈 통합 설정, Spring Boot 3 환경에서의 실전 구현과 Grafana 모니터링, 장애 시나리오별 복구 전략을 다룬다.
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