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Service mesh provides observability, security, and traffic management for east-west communication between microservices without modifying application code. Key benefits include mutual TLS encryption, circuit breakers, load balancing, retries, and advanced HTTP-based routing for canary deployments. Popular implementations like Istio and Linkerd use sidecar proxies to intercept traffic, but come with resource overhead and added complexity that may not be justified for simpler architectures.

Understanding service mesh, and do you really need them?

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