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GCP Professional Cloud Architect Practice Question

Your operations team manages a latency-sensitive trading API packaged as a container and deployed to a single-region Cloud Run service in europe-west1. You must release a new revision every week with (1) no perceptible downtime, (2) the ability to cut over gradually while observing a Cloud Monitoring alert on p95 latency, and (3) an instant rollback path if latency exceeds 50 ms. Which release strategy best meets these requirements?

  • Deploy the new revision to the same Cloud Run service and use traffic splitting to initially send 5 % of requests to it, increasing or reducing the percentage based on observed latency.

  • Create a second Cloud Run service for the new revision and place both services behind an external HTTP(S) Load Balancer, then switch all traffic to the new backend when latency is acceptable.

  • Deploy the current and new revisions to europe-west1 and europe-west2 respectively and use weighted Cloud DNS records to progressively shift traffic between the two regions.

  • Replace the existing revision by deploying the new image with the --revision-suffix flag so that Cloud Run automatically routes 100 % of requests to it; redeploy the previous image if rollback is needed.

GCP Professional Cloud Architect
Managing implementation
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