Which service can create alert rules based on CPU threshold breaches?

Azure Monitor is the correct answer because it is Azure's comprehensive solution for collecting, analyzing, and acting on telemetry from your cloud and on-premises environments. It allows you to set up alert rules based on various metrics, including CPU utilization thresholds, to notify you of potential issues. Azure Service Health provides personalized guidance and support when issues with Azure services affect you, but it doesn't monitor individual resource metrics like CPU. Azure Policy helps enforce organizational standards and assess compliance, not monitor real-time performance metrics. The Azure TCO Calculator estimates cost savings when migrating to Azure and is unrelated to monitoring.