Merge pull request #246069 from aimee-littleton/patch-162

Update resource-health.md

Author: v-shils

articles/nat-gateway/resource-health.md

@@ -24,7 +24,7 @@ The health of your NAT gateway resource is displayed as one of the following sta
 | Resource health status | Description |
 |---|---|
 | Available | Your NAT gateway resource is healthy and available. |
-| Degraded | Your NAT gateway resource has platform or user initiated events impacting the health of your NAT gateway. The metric for the data-path availability has reported less than 80% but greater than 25% health for the last fifteen minutes. You'll experience moderate to severe performance impact. |
+| Degraded | Your NAT gateway resource has platform or user initiated events impacting the health of your NAT gateway. The metric for the data-path availability has reported less than 80% but greater than 25% health for the last 15 minutes. You'll experience moderate to severe performance impact. |
 | Unavailable | Your NAT gateway resource isn't healthy. The metric for the data-path availability has reported less than 25% for the past 15 minutes. You'll experience significant performance impact or unavailability of your NAT gateway resource for outbound connectivity. There may be user or platform events causing unavailability. |
 | Unknown | Health status for your NAT gateway resource hasn’t been updated or hasn’t received information for data-path availability for more than 5 minutes. This state should be transient and will reflect the correct status as soon as data is received. |
 
@@ -38,6 +38,28 @@ To view the health of your NAT gateway resource:
 
 3. Select the **+ Add resource health alert** at the top of the page to set up an alert for a specific health status of your NAT gateway resource. 
 
+## Resource health alerts
+
+Azure Resource Health alerts can notify you in near real-time when the health state of your NAT gateway resource changes. It's recommended that you set resource health alerts to notify you when your NAT gateway resource is in a **Degraded** or **Unavailable** state.
+
+When you create Azure resource health alerts for NAT gateway, Azure sends resource health notifications to your Azure subscription. You can create and customize alerts based on:
+* The subscription affected
+* The resource group affected
+* The resource type affected (Microsoft.Network/NATGateways)
+* The specific resource (any NAT gateway resource you choose to set up an alert for)
+* The event status of the NAT gateway resource affected
+* The current status of the NAT gateway resource affected
+* The previous status of the NAT gateway resource affected
+* The reason type of the NAT gateway resource affected
+
+You can also configure who the alert should be sent to:
+* A new action group (that can be used for future alerts)
+* An existing action group
+
+For more information on how to set up these resource health alerts, see:
+* [Resource health alerts using Azure portal](/azure/service-health/resource-health-alert-monitor-guide#create-a-resource-health-alert-rule-in-the-azure-portal)
+* [Resource health alerts using Resource Manager templates](/azure/service-health/resource-health-alert-arm-template-guide)
+
 ## Next steps
 
 - Learn about [Azure NAT Gateway](./nat-overview.md)