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Design a circuit breaker library for a platform with 800+ microservices and 50K circuit instances that detects failures within a 10-second rolling window and transitions states in under 1ms.
## Problem
Design a circuit breaker system (library or sidecar) for a microservices platform with 800+ services. The system must detect downstream failures using error rate and latency thresholds within a rolling window, manage closed/open/half-open state transitions, provide configurable fallback strategies, and use bulkhead isolation to prevent cascading failures across the platform.
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