Istio

Answer-first: The true cost of microservices lies in hidden infrastructure charges: sidecar proxy memory overhead, cross-AZ data transfer egress fees, NAT Gateway processing fees, and high-cardinality logging ingestion. A modular monolith co-locates processing within the same private subnet and container task, bypassing these multi-thousand-dollar cloud bills entirely. Prerequisite: Before reading this part, please ensure you have read the previous article in this series: Part 1: Architectural Decision Framework. What You’ll Learn That AI Won’t Tell You Sidecar Memory Inflation: Why allocating 512MB RAM for Envoy proxies across 100 microservices wastes 50GB RAM on network routing. Cross-AZ Egress Pricing: The math behind AWS data transfer rates that inflate cloud costs by $0.02 per GB. Prometheus Metric Cardialities: How microservices generate redundant telemetry tags that clog metrics backends. Part 2: FinOps Cost Reality - The “Hidden Tax” of Microservices One of the most appealing promises of Microservices is lean Auto-scaling capability: “Only spin up servers for the service under load.” Theoretically, this saves cloud costs. However, when contrasted with the reality of cloud cost management (FinOps), companies discover the exact opposite: Microservices architectures are often many times more expensive than Monoliths. ...

Prerequisite: Before reading this chapter, please ensure you have read the previous article in this series: Chapter 5: Unlocking Database Performance via Connection Pooling. When your Golang application scales from dozens to hundreds of Microservices, managing communication becomes a macro-level challenge. You will constantly encounter two tightly coupled concepts: API Gateway and Service Mesh. Many engineers ask: “If I already deploy Istio (Service Mesh), do I still need Kong (API Gateway)?” The answer lies in the fundamental difference between North-South and East-West traffic. ...