Notifications for unused VMs to stop spending money
Let me tell you my personal case: I created a VM, used it a lot for preparing university course.
At some point I checked costs and was very disappointed to know that it was running for 10 days and costing me a lot of money. I thought that I switched if off, but I didn't. It would be great notify people like me that VM is running while not being used. E-mail and sms would be great channels for this.

Thanks for your feedback. This is on our roadmap and something we’re working toward.