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Azure Monitor is the primary service used for monitoring and logging applications in Azure. This service allows organizations to collect, analyze, and act on telemetry data from both Azure and on-premises environments. It provides features such as metrics and logs collection, performance monitoring, and alerting mechanisms, all of which enable teams to gain insights into their applications' performance and health.

Azure Monitor integrates tightly with various Azure resources and services, making it easy to set up and configure monitoring capabilities. It supports a wide array of data sources, including logs from applications, infrastructure metrics, and user experience data, which can then be visualized in dashboards or used for setting up alerts and automating responses.

In contrast, the other services mentioned serve different purposes. Azure DevTest Labs is designed for creating and managing environments for testing and development. Azure Functions is a serverless computing service that enables event-driven applications without managing infrastructure. Azure Storage is focused on storing data in various formats and does not directly provide monitoring or logging capabilities. Therefore, Azure Monitor stands out as the dedicated solution for application monitoring and logging within the Azure ecosystem.