A company wants to chart performance trends and trigger alerts when CPU usage exceeds 80%. Which Azure service should they implement?

Azure Monitor is the correct choice because it collects, analyzes, and acts on telemetry data from your Azure and on-premises environments. It allows you to visualize performance trends, create dashboards, and configure alert rules based on specific metrics like CPU usage, triggering notifications or automated actions when thresholds are crossed. Azure Service Health provides personalized guidance and support when Azure service issues affect you, focusing on service outages and planned maintenance, not individual resource performance. Azure Advisor offers recommendations for optimizing costs, performance, reliability, operational excellence, and security, but it doesn't provide real-time monitoring or alerting for specific performance metrics. Azure Policy helps enforce organizational standards and assess compliance at scale, focusing on governance rather than performance monitoring and alerting.