Zero to Multi-Region: High Availability Serverless with Cloud Run and Cross-Region Failover & Failback

Short summary

Google moved Cloud Run Service Health to GA in July 2026, enabling automatic cross-region failover with a two-step setup: add a readiness probe and set minimum instances to at least 1. The Global Load Balancer reads aggregated instance-level health via Serverless NEGs and reroutes traffic to healthy regions automatically, then gradually restores traffic on recovery. This eliminates the need for separate health endpoints and makes failover/failback fully automated at no extra charge.

• •Cloud Run Service Health reached GA with automated cross-region failover
• •Setup requires only a readiness probe and min instances >= 1
• •Failover triggered by real instance-level health, not synthetic endpoint checks

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