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

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### Bytes
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The **Bytes** metric shows you the amount of data going outbound through NAT gateway and returning inbound in response to an outbound connection.
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The **Bytes** metric shows you the amount of data going outbound through NAT gateway and returning inbound in response to an outbound connection.
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Use this metric to:
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Possible reasons for dropped packets:
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- Outbound connectivity failure can cause packets to drop. Connectivity failure can happen for various reasons. See the [NAT gateway connectivity troubleshooting guide](/azure/nat-gateway/troubleshoot-nat-connectivity) to help you further diagnose.
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- Outbound connectivity failure can cause packets to drop. Connectivity failure can happen for various reasons. For more information, see the [NAT gateway connectivity troubleshooting guide](/azure/nat-gateway/troubleshoot-nat-connectivity).
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### SNAT connection count
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Possible reasons for failed connections:
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- A pattern of failed connections can happen for various reasons. See the [NAT gateway connectivity troubleshooting guide](/azure/nat-gateway/troubleshoot-nat-connectivity) to help you further diagnose.
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- A pattern of failed connections can happen for various reasons. For more information, see the [NAT gateway connectivity troubleshooting guide](/azure/nat-gateway/troubleshoot-nat-connectivity).
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> [!NOTE]
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> When NAT gateway is attached to a subnet and public IP address, the Azure platform verifies NAT gateway is healthy by conducting health checks. These health checks appear in NAT gateway's SNAT Connection Count metrics. The amount of health check related connections may vary as the health check service is optimized, but is negligible and doesn’t impact NAT gateway’s ability to connect outbound.

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

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:::image type="content" source="./media/nat-gateway-resource/nat-gateway-deployment.png" alt-text="Diagram of a NAT gateway resource with virtual machines.":::
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[!INCLUDE [horz-monitor-insights](~/reusable-content/ce-skilling/azure/includes/azure-monitor/horizontals/horz-monitor-insights.md)] -->
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[!INCLUDE [horz-monitor-insights](~/reusable-content/ce-skilling/azure/includes/azure-monitor/horizontals/horz-monitor-insights.md)]
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## Network Insights
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[Azure Monitor Network Insights](../network-watcher/network-insights-overview.md) allows you to visualize your Azure infrastructure setup and to review all metrics for your NAT gateway resource from a preconfigured metrics dashboard. These visual tools help you diagnose and troubleshoot any issues with your NAT gateway resource.
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[Azure Monitor Network Insights](../network-watcher/network-insights-overview.md) allows you to visualize your Azure infrastructure setup and to review all metrics for your NAT gateway resource from a preconfigured metrics dashboard. These visual tools help you diagnose and troubleshoot any issues with your NAT gateway resource.
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### View the topology of your Azure architectural setup
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1. On the landing page for **Insights**, there's a topology map of your NAT gateway setup. This map shows the relationship between the different components of your network (subnets, virtual machines, public IP addresses).
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1. Hover over any component in the topology map to view configuration information.
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1. To view configuration information, hover over any component in the topology map.
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:::image type="content" source="./media/nat-metrics/nat-insights.png" alt-text="Screenshot of the Insights section of NAT gateway.":::
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:::image type="content" source="./media/nat-metrics/azure-monitor.png" alt-text="Screenshot of the metrics section of Azure Monitor.":::
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<!-- ## OPTIONAL [TODO-replace-with-service-name] metrics
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If your service uses any non-Azure Monitor based metrics, add the following include and more information.
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[!INCLUDE [horz-monitor-custom-metrics](~/reusable-content/ce-skilling/azure/includes/azure-monitor/horizontals/horz-monitor-non-monitor-metrics.md)] -->
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[!INCLUDE [horz-monitor-no-resource-logs](~/reusable-content/ce-skilling/azure/includes/azure-monitor/horizontals/horz-monitor-no-resource-logs.md)]
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[!INCLUDE [horz-monitor-activity-log](~/reusable-content/ce-skilling/azure/includes/azure-monitor/horizontals/horz-monitor-activity-log.md)]
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## Metrics FAQ
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### What type of metrics are available for NAT gateway?
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- What type of metrics are available for NAT gateway?
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The NAT gateway supports [multi-dimensional metrics](/azure/azure-monitor/essentials/data-platform-metrics#multi-dimensional-metrics). You can filter the multi-dimensional metrics by different dimensions to gain greater insight into the provided data. The [SNAT connection count](monitor-nat-gateway-reference.md#snat-connection-count) metric allows you to filter the connections by Attempted and Failed connections, enabling you to distinguish between different types of connections made by the NAT gateway.
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The NAT gateway supports [multi-dimensional metrics](/azure/azure-monitor/essentials/data-platform-metrics#multi-dimensional-metrics). You can filter the multi-dimensional metrics by different dimensions to gain greater insight into the provided data. The [SNAT connection count](monitor-nat-gateway-reference.md#snat-connection-count) metric allows you to filter the connections by Attempted and Failed connections, enabling you to distinguish between different types of connections made by the NAT gateway.
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Refer to the dimensions column in the [metrics overview](monitor-nat-gateway-reference.md#metrics) table to see which dimensions are available for each NAT gateway metric.
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To see which dimensions are available for each NAT gateway metric, see the dimensions column in the [metrics overview table](monitor-nat-gateway-reference.md#metrics).
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### How do I store NAT gateway metrics long-term?
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- How do I store NAT gateway metrics long-term?
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All [platform metrics are stored](/azure/azure-monitor/essentials/data-platform-metrics#retention-of-metrics) for 93 days. If you require long term access to your NAT gateway metrics data, NAT gateway metrics can be retrieved by using the [metrics REST API](/rest/api/monitor/metrics/list). For more information on how to use the API, see the [Azure monitoring REST API walkthrough](/azure/azure-monitor/essentials/rest-api-walkthrough).
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All [platform metrics are stored](/azure/azure-monitor/essentials/data-platform-metrics#retention-of-metrics) for 93 days. If you require long term access to your NAT gateway metrics data, NAT gateway metrics can be retrieved by using the [metrics REST API](/rest/api/monitor/metrics/list). For more information on how to use the API, see the [Azure monitoring REST API walkthrough](/azure/azure-monitor/essentials/rest-api-walkthrough).
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> [!NOTE]
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> Diagnostic Settings [doesn’t support the export of multi-dimensional metrics](/azure/azure-monitor/reference/supported-metrics/metrics-index#exporting-platform-metrics-to-other-locations) to another location, such as Azure Storage and Log Analytics.
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>
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> To retrieve NAT gateway metrics, use the metrics REST API.
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> [!NOTE]
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> Diagnostic Settings [doesn’t support the export of multi-dimensional metrics](/azure/azure-monitor/reference/supported-metrics/metrics-index#exporting-platform-metrics-to-other-locations) to another location, such as Azure Storage and Log Analytics.
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>
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> To retrieve NAT gateway metrics, use the metrics REST API.
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### How do I interpret metrics charts?
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- How do I interpret metrics charts?
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Refer to [troubleshooting metrics charts](/azure/azure-monitor/essentials/metrics-troubleshoot) if you run into issues with creating, customizing or interpreting charts in Azure metrics explorer.
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Refer to [troubleshooting metrics charts](/azure/azure-monitor/essentials/metrics-troubleshoot) if you run into issues with creating, customizing, or interpreting charts in Azure metrics explorer.
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## Related content
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