# Find out what minions are running.
    local -a minions
    kube::util::read-array minions < <(gcloud compute instances list \
      --project "${PROJECT}" \
      --filter="(name ~ '${NODE_INSTANCE_PREFIX}-.+' OR name ~ '${WINDOWS_NODE_INSTANCE_PREFIX}-.+') AND zone:(${ZONE})" \
      --format='value(name)')
    # If any minions are running, delete them in batches.