Use two or more Application Gateway instances#
Application Gateways should use a minimum of two instances.
Application Gateways should use two or more instances to be covered by the Service Level Agreement (SLA).
When using Application Gateway v1 or v2 with auto-scaling disabled, specify the number of instances to be two or more. When auto-scaling is enabled with Application Gateway v2, configure the minimum number of instances to be two or more.