multiAzPolicy

The scaling policy for ECS instances in a multi-zone scaling group. Valid value: PRIORITY, COST_OPTIMIZED and BALANCE. PRIORITY: scales the capacity according to the virtual switches you define (VSwitchIds.N). When an ECS instance cannot be created in the zone where the higher-priority vSwitch is located, the next-priority vSwitch is automatically used to create an ECS instance. COST_OPTIMIZED: try to create by vCPU unit price from low to high. When the scaling configuration is configured with multiple instances of preemptible billing, preemptible instances are created first. You can continue to use the CompensateWithOnDemand parameter to specify whether to automatically try to create a preemptible instance by paying for it. It takes effect only when the scaling configuration has multi-instance specifications or preemptible instances. BALANCE: distributes ECS instances evenly among the multi-zone specified by the scaling group. If the zones become unbalanced due to insufficient inventory, you can use the API RebalanceInstances to balance resources.