What is Google Cloud's approach to multi-region high availability?

GCP multi-region HA uses two patterns. Single-region multi-zone: deploy resources across 3+ zones in one region. For VMs: use a Multi-Zone Managed Instance Group. For GKE: multi-zone node pools and regional clusters. For databases: Cloud SQL HA uses synchronous replication to a standby in another zone. This protects against zone failures with near-zero RPO. Multi-region: deploy across multiple regions for protection against regional outages. Use Global Load Balancing (single anycast IP routes to nearest healthy region). For data: Cloud Spanner multi-region, Firestore multi-region, GCS multi-region buckets. For GKE: deploy workloads in clusters in multiple regions with a Global LB frontend. Key tools: Cloud Endpoints, Traffic Director (service mesh control plane), Cloud DNS with geo-routing. GCP's global anycast LB makes multi-region failover essentially instant — no DNS propagation delays.