Well, it was in preview... But, finally it got GA
You can now begin deploying Spot VMs in your Google Cloud projects to start saving now. For an overview of Spot VMs, see our Preview launch blog and for a deeper dive, check out our Spot VM documentation.
Modern applications such as microservices, containerized workloads, and horizontal scalable applications are engineered to persist even when the underlying machine does not. This architecture allows you to leverage Spot VMs to access capacity and run applications at a low price. You will save 60 - 91% off the price of our on-demand VMs with Spot VMs.
To make it even easier to utilize Spot VMs, we’ve incorporated Spot VM support in a variety of tools. GKE for instance