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Why do only update / rebalance every 30 minutes? Is that because of the per-hour billing (so replacing an on-demand one only part way through its life is a mistake). If so, it still seems like you'd want to inspect every 5 minutes or so (keep on-demand until it reaches > 60-frequency).

Disclosure: I work on Compute Engine (and launched our preemptible VMs product).

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It's because so far I am only considering replacing the nodes slowly, one at a time, mostly in order not to hit any soft limits that may be defined on the account(like total number of instances), but also in order to give the user the chance to stop it in case things go south for whatever reason during the evaluation, since as I warned, this thing is likely full of bugs at this point.

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