Design a service mesh handling mTLS, traffic splitting, and observability across 2000+ microservices and 50K pods with sub-millisecond proxy overhead.
## Problem
Design a service mesh infrastructure — similar to Istio or Linkerd — that provides transparent mTLS encryption, traffic management, and observability for a platform running 2000+ microservices across 50K pods. The mesh must add minimal latency overhead while giving platform teams centralized control over routing, resilience policies, and service-to-service authentication without requiring application code changes.
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