GCP Professional Cloud Architect Practice Question

Your company, a global fashion retailer, is launching a new Golang-based microservice for its e-commerce storefront. Business stakeholders require worldwide user latency below 150 ms, the ability to absorb flash-sale traffic spikes 20× above the daily average, zero-downtime releases, and minimal infrastructure operations. For the next six months the service must continue to use the existing on-premises PostgreSQL database while a full migration is planned. Which Google Cloud architecture best satisfies these requirements?

Use a regional managed instance group of preemptible Compute Engine VMs behind a regional external HTTPS load balancer, scale on CPU, connect to the on-premises PostgreSQL database over Cloud VPN, and perform blue/green deployments by swapping instance templates.
Package the service into a container and deploy it to Cloud Run in multiple regions behind a global external HTTPS load balancer with Cloud CDN; connect to the on-premises PostgreSQL database over a Dedicated Interconnect protected by HA VPN; manage zero-downtime releases with Cloud Deploy canary rollouts.
Run the microservice in an App Engine flexible environment in one region, synchronize inventory changes to a Cloud Bigtable instance via Datastream, and rely on App Engine automatic scaling and Cloud Armor for DDoS protection.
Create a single-region GKE Standard cluster with node auto-provisioning, expose the service through an internal load balancer and Cloud NAT, and replicate the on-premises PostgreSQL database to Cloud SQL using Database Migration Service before cut-over.

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Answer Description

Running the workload on Cloud Run delivers automatic scaling from zero to thousands of container instances without manual VM management, aligning with the minimal-ops requirement and handling 20× traffic spikes. Deploying Cloud Run services in multiple regions behind a global external HTTPS load balancer and Cloud CDN keeps user latency low worldwide. A Dedicated Interconnect supplemented with HA VPN provides high-bandwidth, encrypted connectivity to the on-premises PostgreSQL instance until it is migrated. Cloud Deploy supports progressive rollouts (canary or blue/green) for Cloud Run, enabling zero-downtime releases. The other options either rely on regional or preemptible VM infrastructure that increases operational burden, lack a global front-end, or move the database prematurely, so they fail to meet one or more stated business requirements.

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