Query: network_security_group_not_configured_gateway_subnets

select
  subnet.id resource,
  case
    when subnet.name = 'GatewaySubnet' and network_security_group_id is not null then 'alarm'
    when subnet.name = 'GatewaySubnet' and network_security_group_id is null then 'ok'
    else 'skip'
  end as status,
  case
    when subnet.name = 'GatewaySubnet' and network_security_group_id is not null then 'Gateway subnet configured with network security group.'
    when subnet.name = 'GatewaySubnet' and network_security_group_id is null then 'Gateway subnet not configured with network security group.'
    else subnet.name || ' not of gateway subnet type.'
  end as reason
  , subnet.resource_group as resource_group
  , sub.display_name as subscription
from
  azure_subnet as subnet
  join azure_subscription as sub on sub.subscription_id = subnet.subscription_id;