GCP Professional Cloud Architect Practice Question

Your organization runs multiple GKE Autopilot clusters and a fleet of Compute Engine VMs spread across three projects that share the same Cloud Billing account. These workloads are expected to remain steady for at least the next 12 months. Finance asks whether each project must purchase its own Committed Use Discounts to maximize savings. Which statement accurately describes how CUDs can be leveraged in this situation?

Spend-based CUDs for GKE Autopilot apply across all projects in a billing account, and a single regional resource-based CUD can cover the Compute Engine usage of every project in that region.
Each project must purchase its own CUDs because commitments cannot be shared across project boundaries.
Committed use discounts cannot be used with Kubernetes workloads; the finance team should rely on sustained use discounts for GKE Autopilot instead.
CUDs are scoped to the Google Cloud organization, so they automatically apply to every billing account it contains.

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Answer Description

Committed use discounts are purchased at the Cloud Billing-account level, not at the project level.

Spend-based CUDs (used by services such as GKE Autopilot and Cloud Run) apply to all eligible usage in every region and project that is linked to the billing account.
Resource-based CUDs for Compute Engine are also bought at the billing-account level, but they are tied to a specific region; any project under the same billing account that runs eligible VM resources in that region automatically receives the discount.

Therefore, a single set of appropriately sized spend-based and regional resource-based commitments can cover the steady usage of all three projects, eliminating the need for each project to buy its own CUDs.

Why the other statements are incorrect:

CUDs are not limited to a single project; they can be shared across all projects that use the same Cloud Billing account.
Discounts are associated with a Cloud Billing account, not with the entire organization, so they do not automatically apply across different billing accounts.
Kubernetes workloads running in GKE Autopilot are eligible for spend-based CUDs; relying solely on sustained use discounts would forgo additional savings opportunities.

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