feat(backend): audit circuit breaker — Prometheus telemetry, exponent… - #1592
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emdevelopa merged 1 commit intoSep 30, 2026
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…ial retry, distributed locking, and stress tests (emdevelopa#1433 emdevelopa#1434 emdevelopa#1435 emdevelopa#1436) - emdevelopa#1433: Add prom-client Gauge/Counter/Histogram metrics to AuditCircuitBreaker for state, transitions, failures, successes, open duration, and health checks. Add Prometheus alerting rules (OPEN for >2m, flapping, high failure rate). - emdevelopa#1434: Add execute(fn, options) method with automated exponential backoff retry (baseDelayMs * 2^attempt + jitter), configurable maxRetries and retryableErrors. Export CircuitOpenError. Update audit-writer.js to use execute(). - emdevelopa#1435: Add DistributedAuditCircuitBreakerLock with Redis SET NX PX locking, Lua-guarded release, state sync/publish across instances, and graceful Redis fallback. Add maxConcurrency semaphore to AuditWriterQueue. - emdevelopa#1436: Add integration test suite (10 scenarios) and stress test suite (7 scenarios) covering full state machine, metrics, retry backoff, distributed lock, queue concurrency, and mixed-load circuit behavior. Closes emdevelopa#1433 Closes emdevelopa#1434 Closes emdevelopa#1435 Closes emdevelopa#1436
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…ial retry, distributed locking, and stress tests (#1433 #1434 #1435 #1436)
[Backend] Add Prometheus alert metrics and health telemetry to Audit Circuit Breaker #1433: Add prom-client Gauge/Counter/Histogram metrics to AuditCircuitBreaker for state, transitions, failures, successes, open duration, and health checks. Add Prometheus alerting rules (OPEN for >2m, flapping, high failure rate).
[Backend] Implement automated retry with exponential backoff in Audit Circuit Breaker #1434: Add execute(fn, options) method with automated exponential backoff retry (baseDelayMs * 2^attempt + jitter), configurable maxRetries and retryableErrors. Export CircuitOpenError. Update audit-writer.js to use execute().
[Backend] Enhance distributed concurrency control and locking for Audit Circuit Breaker #1435: Add DistributedAuditCircuitBreakerLock with Redis SET NX PX locking, Lua-guarded release, state sync/publish across instances, and graceful Redis fallback. Add maxConcurrency semaphore to AuditWriterQueue.
[Backend] Add comprehensive integration and stress test suite for Audit Circuit Breaker #1436: Add integration test suite (10 scenarios) and stress test suite (7 scenarios) covering full state machine, metrics, retry backoff, distributed lock, queue concurrency, and mixed-load circuit behavior.
Closes #1433
Closes #1434
Closes #1435
Closes #1436