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The feature that sends an administrator an email when a virtual machine (VM) is about to exceed its usage quota for the month is Alerts. Azure Alerts enables you to monitor specific metrics and conditions, such as the usage levels of resources like VMs, and sends notifications based on defined rules. By setting up alerts for a VM's usage, you can receive proactive notifications before the quota is reached, allowing for timely intervention.

While Application Insights focuses on monitoring application performance and usage, and Service Health provides information about the condition of Azure services, neither directly addresses resource quota notifications. Metrics gather performance data but do not inherently send alerts unless configured to do so, which is the primary role of the Alerts feature. Thus, Alerts is the correct choice for this scenario.