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Design a feature flag platform serving 1,000+ microservices evaluating 10B flag checks/day with sub-millisecond local evaluation and sub-5-second global propagation.
## Problem
Design a feature flag platform similar to LaunchDarkly or Unleash that enables engineering teams to decouple deployment from release. The system must support 1,000+ microservices evaluating flags 10 billion times per day with sub-millisecond local evaluation, multiple flag types (boolean, percentage rollout, user-targeted), and a management plane for creating, auditing, and retiring flags.
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