Final answer:
To receive notifications on maintenance affecting Azure resources, use Azure Service Health. This service offers personalized alerts about Azure service issues, including maintenance events.
Step-by-step explanation:
If you need to be notified when Microsoft plans to perform maintenance that might affect the resources deployed to an Azure Subscription, you should use Azure Service Health. Azure Service Health provides personalized alerts and guidance when Azure service issues affect you. It can inform you about maintenance schedules and also help you understand the impact on your resources. This service will notify you, for example, when your virtual machines will be restarted due to maintenance.
Other options like Azure Advisor provide recommendations on best practices, while Azure Resource Manager is a deployment and management service, and Azure Monitor helps you collect, analyze, and act on telemetry data from your Azure and on-premises environments. However, for maintenance notifications specifically, Azure Service Health is the tool designed for that purpose.