One of the biggest issue that you might experience in Managed Instance is reaching storage limit or finding out that you dont have enough CPU. In this case you would need to get the bigger instance; however, this is not instant operation. In this post, you will see how you can monitor resource usage and... Read more

https://blogs.msdn.microsoft.com/sqlserverstorageengine/2019/03/06/sending-resource-alerts-on-managed-instance-using-db_mail/