Why it matters

LLM systems often microservices. Mesh shapes security + observability.

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The architecture

Sidecar or ambient.

mTLS between services.

Policy enforcement.

Service mesh stackSidecarproxy per podmTLSidentity-basedPolicyauth + rate limitAmbient mode reduces sidecar overhead; growing adoption
Service mesh.
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How it works end to end

mTLS: automatic between services.

Policy: L7 auth, rate limit.

Observability: distributed traces.

Traffic control.