A hospital system needs a centralized view of performance metrics and logs across all Azure services. Which tool should they use?

Azure Monitor is the correct choice because it provides a comprehensive solution for collecting, analyzing, and acting on telemetry from your Azure and on-premises environments. It offers a centralized view of performance metrics, activity logs, and diagnostic logs, enabling deep insights into the health and performance of all Azure services. Azure Sentinel is a Security Information and Event Management (SIEM) solution focused on security analytics and threat intelligence, not general performance monitoring. Azure Arc extends Azure management to on-premises, multi-cloud, and edge environments, but it's not a monitoring tool itself. Azure DevTest Labs is for creating environments for testing and development, not for monitoring production systems.