ConstReadonlyON_DEMAND: "ON_DEMAND"Use on-demand instances.
ReadonlySPOT: "SPOT"Use spot instances.
ReadonlySPOT_WITH_FALLBACK: "SPOT_WITH_FALLBACK"Preferably use spot instances, but fall back to on-demand instances if spot instances cannot be acquired (e.g., if AWS spot prices are too high).
Availability type used for all subsequent nodes past the
first_on_demandones.Note: If
first_on_demandis zero, this availability type will be used for the entire cluster.