AutoScale reports whether the provider's cluster autoscaler owns this pool's size, moving Count between MinNodes and MaxNodes as workloads demand. False means Count changes only when someone scales the pool.
PoolID is the provider's id for the pool — the value the scale and delete routes address it by. It falls back to the pool's name when the provider answered without one, so it is always something the routes accept.
Size is the provider size slug every node in the pool runs at ("s-4vcpu-8gb", "gpu-h100x8-640gb"). One pool is one size — a mixed cluster is several pools.