GCP Associate Cloud Engineer Practice Question

Your company wants to make sure its development project never exceeds its USD 1,000 monthly spend. At 75 % of that amount, a Cloud Function must run that labels and shuts down all non-production VM instances. Which Google Cloud feature should you configure so that a Pub/Sub message is automatically published when the 75 % spend threshold is reached and can be used to trigger the function?

Configure a Cloud Audit Logs sink that exports billing log entries to a Pub/Sub topic.
Schedule a daily BigQuery billing export query with Cloud Scheduler and publish a Pub/Sub message when spend exceeds 75 %.
Create a Cloud Billing budget that includes a 75 % alert and enable Pub/Sub notifications on that budget.
Set up a Cloud Monitoring alerting policy on the billing/cost metric with a Pub/Sub notification channel.

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Answer Description

Cloud Billing budgets include an option to publish a message to a Cloud Pub/Sub topic whenever a specified percentage of the budget is reached. When you set a budget and add a 75 % alert threshold, the Billing Budget service publishes a JSON-formatted message to the chosen topic. A Cloud Function subscribed to that topic can then execute any automated response, such as labeling or stopping VMs. Cloud Monitoring alert policies, Audit Logs sinks, or Cloud Scheduler queries all require additional data processing and do not natively emit spend-threshold events; therefore they are not the most direct or supported way to trigger programmatic actions from a budget limit.

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