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Explain production change management principles including change review, rollback plans, blast radius reduction, change windows, feature flags, and canary deployments for a team deploying 10 times per day.
## Problem
Your team deploys code changes 10 times per day across 5 services. Historically, about 15% of deployments cause some degree of user impact — from minor latency increases to full outages. Leadership wants to reduce the change failure rate to below 5% without significantly slowing deployment velocity. Explain the principles and practices of production change management.
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