There is no notification when a virtual machine is created higher than the free tier limit. Error message of free trial expired pattern arises in the notification. So, what is the maximum allowed resource?
Here GCP will provide a free trial which comes under free services and also it will provide you with $300 credits. Where resources are free and also some resources come with charges where that can be deducted from the free trial of 12 months.
For more details, refer to this tutorial on google cloud training.