Reuse of Instance ID in Google Cloud Compute Engine

[mkyrychenko]

Hello community,

I have a question regarding the uniqueness and possible reuse of instance_id in Google Cloud Compute Engine.

I understand that the 19-digit instance_id is a unique numerical identifier automatically assigned to a virtual machine (VM) when it is created.
However, is there any possibility that this identifier could be reused for a new instance after the old one is deleted?

Additionally, I would like to clarify whether it is recommended to use a instance_creation_timestamp alongside the instance_id, project_id and zone to uniquely identify virtual machines over time and across projects (as it is used in unique JSON Web Token (JWT)) ?
This is important to ensure the uniqueness of records in a database and to correctly track the allowlisted VMs.

I would appreciate any clarification on this.

Thank you!
Mykyta KYRYCHENKO