Yes. The Application Gateway v1 SKU continues to be supported. However, it's strongly recommended to move to v2 to take advantage of the feature updates in that SKU. For more information on the differences between v1 and v2 features, see Autoscaling and Zone-redundant Application Gateway v2. You can manually migrate Application Gateway v1 sku deployments to v2 by following our v1-v2 migration document.