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An AI agent is designed to monitor customer reviews in real-time. Whenever the agent identifies a review with a highly negative sentiment, it needs to immediately execute a small piece of code that sends an urgent alert to a manager's Slack channel. The company wants the most cost-effective and lightweight solution for this notification task, as it will only run intermittently. Which Google Cloud service is the ideal tool for an agent to trigger this kind of stateless, event-driven action?