I wish Google would just adopt spot prices like AWS EC2, where you can look at the 3-month spot price history to estimate cost and to discover combinations of availability zone and instance type with extra capacity. GCE’s preemptible instances are “easy” in that there is no spot price to bid, but the downside is the total absence of information, since there is no way to look up capacity once your instance is shut down.
This is a known problem. You should ping your account team for more information on upcoming development.
Your account team can also advise you on what zones you should deploy preemptives in. Googlers internally can see current preemptive capacity and preemption rates on a per zone level. In certain zones you're more likely to have preemption due to large customer demand.
