"Msk"
- Self-managed Kafka → AWS MSK：把 $15K/month operational cost 拆解到 managed Kafka self-managed → MSK 是 Type C operational redesign — protocol 完全相容、operational stack（ZooKeeper / brokers / monitoring / patching）全託管；本文用 cost 拆解開頭、5 個 production 踩雷（client connection pattern / version pinning / metric pipeline / IAM auth / cross-cluster mirror）