agw-8 - add query (#414)

Co-authored-by: Rodrigo Santos <[email protected]>

docs/content/services/networking/application-gateway/_index.md

@@ -21,7 +21,7 @@ The presented resiliency recommendations in this guidance include Application Ga
 | [AGW-5 - Monitor and Log the configurations and traffic](#agw-5---monitor-and-log-the-configurations-and-traffic)                            |    Monitoring     | Medium | Preview |         No          |
 | [AGW-6 - Use Health Probes to detect backend availability](#agw-6---use-health-probes-to-detect-backend-availability)                        |    Monitoring     | Medium | Preview |         Yes         |
 | [AGW-7 - Deploy Application Gateway in a zone-redundant configuration](#agw-7---deploy-application-gateway-in-a-zone-redundant-configuration)|   Availability    |  High  | Preview |         Yes         |
-| [AGW-8 - Plan for backend maintenance by using connection draining](#agw-8---plan-for-backend-maintenance-by-using-connection-draining)      |    Governance     | Medium | Preview |         No          |
+| [AGW-8 - Plan for backend maintenance by using connection draining](#agw-8---plan-for-backend-maintenance-by-using-connection-draining)      |    Governance     | Medium | Preview |         Yes          |
 | [AGW-9 - Ensure Application Gateway Subnet is using a /24 subnet mask](#agw-9---ensure-application-gateway-subnet-is-using-a-24-subnet-mask) |    Networking     |  High  | Preview |         Yes          |
 
 {{< /table >}}

docs/content/services/networking/application-gateway/code/agw-8/agw-8.kql

@@ -1 +1,9 @@
-// under-development
+// Azure Resource Graph Query
+// This query will check if connection draining is enabled
+resources
+| where type =~ "microsoft.network/applicationGateways"
+| mv-expand backendHttpSettings = properties.backendHttpSettingsCollection
+| extend connectionDrainingEnabled = backendHttpSettings.properties.connectionDraining.enabled
+| where connectionDrainingEnabled != true
+| extend backendPoolName = backendHttpSettings.name
+| project recommendationId = "agw-8", name, id, tags, param1 = "connectionDraining: Disabled", param2 = strcat("backendSettingsName: ", backendPoolName)