GKE zone layout spanning DEV, UAT, and PROD environments across us-east1 regions with progressive HA and cost optimization. DEV runs single-zone with np-default and np-redpanda node pools; UAT scales to 3-zone RF=3 with NVMe-backed Redpanda; PROD adds autoscaling, 2-node default pools, and n2-standard-8 compute for disaster recovery readiness. Each environment integrates MongoDB Atlas M10 via Private Service Connection and demonstrates cost-tiered infrastructure from ~$603/mo dev to ~$2,301/mo production. Fork this diagram to customize node pool sizing, replication factors, or regional topology for your GKE workloads.