release-it

Prevent cascading failures by combining circuit breakers, timeouts, and bulkheads on every integration point. Circuit breakers stop calls to failing dependencies, timeouts free blocked threads, and bulkheads isolate resource pools so one failing dependency cannot drain the whole system.

Blue-green deployment switches all traffic between two full environments, giving instant rollback but requiring double infrastructure. Canary releases route a small traffic percentage to the new version with automated metric evaluation, minimizing risk exposure at lower cost.

Size connection pools from measured peak concurrency plus 20-30% headroom, not defaults. Set checkout timeouts of 1-2 seconds, recycle connections every 30-60 minutes, and reserve database connections for admin and monitoring access.

Alert on user-facing symptoms like error rate and latency, not causes like CPU usage. CPU can be at 90% with users unaffected, or at 50% while users see errors from a deadlock. Use SLO burn-rate alerts tied to your error budget.

Avoid production chaos experiments during peak traffic, known risky periods, or without an emergency stop mechanism. Start in staging, use minimal blast radius such as a single instance or canary population, and always have authorized engineers with rollback plans.

Slow responses block threads and exhaust connection pools while circuit breakers stay closed, spreading delay up the call chain. Fast failures trip breakers immediately, release resources, and let users retry, containing the impact to a single request.