Which Azure service provides monitoring of performance metrics and logs across resources?

Azure Monitor is the correct answer because it is a comprehensive monitoring solution for collecting, analyzing, and acting on telemetry from your Azure and on-premises environments. It provides deep insights into the performance and health of your applications and infrastructure. Azure Arc extends Azure management to on-premises, multi-cloud, and edge environments, but it's not primarily a monitoring service. Azure Defender (now part of Microsoft Defender for Cloud) is a security solution for threat protection, not performance monitoring. Azure Advisor provides personalized recommendations for optimizing Azure resources, focusing on cost, performance, reliability, security, and operational excellence, but it's not a direct monitoring service like Azure Monitor.