Budget alert
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A budget alert fires when spend reaches a percentage of a budget you set — typically 50%, 90% and 100%.
The critical property, especially on Google Cloud: it does not stop anything. Reaching 100% sends an email and your API keeps working.
Making it stop requires wiring the budget's notification to automation that disables billing — which takes down the entire project, not just the AI workload. Usually the better lever is an API quota. Gemini budget alerts.