ConstReadonlyON_DEMAND_AZURE: "ON_DEMAND_AZURE"Use on-demand instances.
ReadonlySPOT_AZURE: "SPOT_AZURE"Use spot instances.
ReadonlySPOT_WITH_FALLBACK_AZURE: "SPOT_WITH_FALLBACK_AZURE"Preferably use spot instances, but fall back to on-demand instances if spot instances cannot be acquired (e.g., if Azure is out of Quota).
Availability type used for all subsequent nodes past the
first_on_demandones. Note: Iffirst_on_demandis zero, this availability type will be used for the entire cluster.