Reservations are a great way of saving money in Azure if you can commit to a 1-year or 3-year term for services such as virtual machine compute. However, savings are only made if the Reservations are used, stopping Pay-As-You-Go charges. Administrators have historically been able to view utilisation rates in the Azure Management Portal, but there’s now a new alert feature which sends an email whenever a Reservation exhibits low utilisation.

See the announcement article here: https://bit.ly/3qZSxah, and find information on how to set these alerts up here: https://bit.ly/44ocFRN.