Add NAT gateway as resource with resource health

Author: aimee-littleton

articles/service-health/resource-health-checks-resource-types.md

@@ -189,6 +189,12 @@ Below is a complete list of all the checks executed through resource health by r
 |---|
 |<ul><li>Are the load balancing endpoints available?</li></ul>|
 
+
+## Microsoft.network/natGateways
+|Executed Checks|
+|---|
+|<ul><li>Are the NAT gateway endpoints available?</li></ul>|
+
 ## Microsoft.network/trafficmanagerprofiles
 |Executed Checks|
 |---|
@@ -268,4 +274,4 @@ Below is a complete list of all the checks executed through resource health by r
 ## Next Steps
 -  See [Introduction to Azure Service Health dashboard](service-health-overview.md) and [Introduction to Azure Resource Health](resource-health-overview.md) to understand more about them. 
 -  [Frequently asked questions about Azure Resource Health](resource-health-faq.yml)
-- Set up alerts so you are notified of health issues. For more information, see [Configure Alerts for service health events](./alerts-activity-log-service-notifications-portal.md).
+- Set up alerts so you are notified of health issues. For more information, see [Configure Alerts for service health events](./alerts-activity-log-service-notifications-portal.md).