Update monitor-nat-gateway.md

Deleted "[Create a diagnostic setting](/azure/azure-monitor/essentials/create-diagnostic-settings) to collect and route resource log data" portion as we can confirm that diagnostics setting isn't supported for NATGateway (For both Portal and Powershell. Please see below notes.)

Tried in Portal, ARM Templates, PowerShell

◇Portal




-> Cannot select NATGateway from the dropdown

◇PowerShell 
Create diagnostic settings in Azure Monitor
https://learn.microsoft.com/en-us/azure/azure-monitor/essentials/create-diagnostic-settings?tabs=powershell


◇ARM template
{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "scope": {
        "type": "string"
    },
    "workspaceId": {
        "type": "string"
    },
    "settingName": {
        "type": "string"
    }
},
  "resources": [
    {
      "type": "Microsoft.Insights/diagnosticSettings",
      "apiVersion": "2021-05-01-preview",
      "scope": "[parameters('scope')]",
      "name": "[parameters('settingName')]",
      "properties": {
       "workspaceId": "[parameters('workspaceId')]",
      "logs": [
             {
            "category": null,
            "categoryGroup": "audit",
            "enabled": true
          }
        ]
      }
    }
  ]
  }
{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentParameters.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "settingName": {
        "value": "audit3"
    },
    "workspaceId": {
      "value": "/XXXXXXXX/resourceGroups/LogAnalyticsWorkspace/providers/Microsoft.OperationalInsights/workspaces/LAWSTest01EUS"
    },
    "scope": {
      "value": "/subscriptions/XXXXXXXX/resourceGroups/NATGW/providers/Microsoft.Network/natGateways/NATGW"
    }
  }
}





The resource type 'microsoft.network/natgateways' does not support diagnostic settings
=> NATGW does not support Diagnostics settings

◇PowerShell
$NATGW = Get-AzNatGateway -ResourceGroupName "NATGW" -Name "NATGW"
$Law = Get-AzOperationalInsightsWorkspace -ResourceGroupName "loganalyticsworkspace" -Name "LAWSTest01EUS"
$metric = New-AzDiagnosticSettingMetricSettingsObject -Enabled $true -Category AllMetrics
# For all available logs, use:
$log = New-AzDiagnosticSettingLogSettingsObject -Enabled $true -CategoryGroup allLogs  
# or, for audit logs, use:
$log = New-AzDiagnosticSettingLogSettingsObject -Enabled $true -CategoryGroup audit    
New-AzDiagnosticSetting -Name 'NATGW-Diagnostics' -ResourceId "/subscriptions/XXXXXXXX/resourceGroups/NATGW/providers/Microsoft.Network/natGateways/NATGW" -WorkspaceId $Law.ResourceId -Log $log -Metric $metric -Verbose



=> NATGW does not support Diagnostics settings

Author: ryujiiwasa

articles/nat-gateway/monitor-nat-gateway.md

@@ -20,7 +20,7 @@ This table describes how you can collect data to monitor your service, and what
 |Data to collect|Description|How to collect and route the data|Where to view the data|Supported data|
 |---------|---------|---------|---------|---------|
 |Metric data|Metrics are numerical values that describe an aspect of a system at a particular point in time. Metrics can be aggregated using algorithms, compared to other metrics, and analyzed for trends over time.|[- Collected automatically at regular intervals.</br> - You can route some platform metrics to a Log Analytics workspace to query with other data. Check the **DS export** setting for each metric to see if you can use a diagnostic setting to route the metric data.]|[Metrics explorer](/azure/azure-monitor/essentials/metrics-getting-started)| [Azure NAT Gateway metrics supported by Azure Monitor](/azure/nat-gateway/monitor-nat-gateway-reference#metrics)|
-|Resource log data|Logs are recorded system events with a timestamp. Logs can contain different types of data, and be structured or free-form text. You can route resource log data to Log Analytics workspaces for querying and analysis.|[Create a diagnostic setting](/azure/azure-monitor/essentials/create-diagnostic-settings) to collect and route resource log data.| [Log Analytics](/azure/azure-monitor/learn/quick-create-workspace)|[Azure NAT Gateway resource log data supported by Azure Monitor](/azure/nat-gateway/monitor-nat-gateway-reference#activity-log)  |
+|Resource log data|Logs are recorded system events with a timestamp. Logs can contain different types of data, and be structured or free-form text. You can route resource log data to Log Analytics workspaces for querying and analysis.|| [Log Analytics](/azure/azure-monitor/learn/quick-create-workspace)|[Azure NAT Gateway resource log data supported by Azure Monitor](/azure/nat-gateway/monitor-nat-gateway-reference#activity-log)  |
 |Activity log data|The Azure Monitor activity log provides insight into subscription-level events. The activity log includes information like when a resource is modified or a virtual machine is started.|- Collected automatically.</br> - [Create a diagnostic setting](/azure/azure-monitor/essentials/create-diagnostic-settings) to a Log Analytics workspace at no charge.|[Activity log](/azure/azure-monitor/essentials/activity-log)|  |
 
 [!INCLUDE [azmon-horz-supported-data](~/reusable-content/ce-skilling/azure/includes/azure-monitor/horizontals/azmon-horz-supported-data.md)]
@@ -46,4 +46,4 @@ For more information on NAT Gateway Insights, see [Network Insights](nat-metrics
 ## Related content
 
 - See [Azure NAT Gateway monitoring data reference](monitor-nat-gateway-reference.md) for a reference of the metrics, logs, and other important values created for Azure NAT Gateway.
-- See [Monitoring Azure resources with Azure Monitor](/azure/azure-monitor/essentials/monitor-azure-resource) for general details on monitoring Azure resources.
+- See [Monitoring Azure resources with Azure Monitor](/azure/azure-monitor/essentials/monitor-azure-resource) for general details on monitoring Azure resources.