Explain advanced service mesh architecture and sidecar patterns in PHP infrastructure.

Service meshes manage service-to-service communication using sidecar proxies that provide traffic control, security, resilience, and observability.

As microservices scale, networking complexity becomes overwhelming.

Problems include:

Embedding these concerns inside every PHP service creates duplicated complexity.

Service meshes externalize networking into infrastructure.

Core architecture:

Each service receives a dedicated proxy. Typically Envoy.

Centralized configuration management.

Actual traffic handled by sidecars.

Core mesh capabilities:

1.…