Azure Monitor collects and analyzes telemetry data from a variety of resources in Azure, providing deep insights into the performance and health of applications, infrastructure, and network. This includes collecting data such as metrics, logs, and events that enable developers and IT professionals to understand the state of their resources and diagnose potential issues. Azure Activity Log, on the other hand, is a log that provides insight into subscription-level events, which includes actions and changes. Azure Service Dashboard offers a view of the health of Azure services, and Azure Cost Management is a tool for analyzing and managing cloud spending. The primary function of Azure Monitor is to collect and analyze telemetry data to monitor the state of resources.