Who actually determines whether the massive 91% discount offered by Google Cloud Spot VMs outweighs the risk of your servers being shut down with only a 30-second notice? Furthermore, these instances represent Google’s unused compute capacity and are ideal for workloads that are naturally fault-tolerant or stateless. Why is mastering the transition from fixed-runtime preemptible VMs to the more flexible Spot model now a core requirement for optimizing cloud infrastructure costs?