# CloudWatch metrics in AWS Cloud WAN
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You can use the following features to monitor your Cloud WAN network, analyze traffic patterns, and troubleshoot issues with your Cloud WAN global network.

## Cloud WAN metrics and dimensions
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You can use metrics to verify that your system is performing as expected. For example, you can create a CloudWatch alarm to monitor a specified metric and initiate an action (such as sending a notification to an email address) if the metric goes outside what you consider an acceptable range.

Amazon VPC measures and sends its metrics to CloudWatch in 60-second intervals.

For more information, see the [Amazon CloudWatch User Guide](https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/).

The `AWS/NetworkManager` namespace includes the following metrics. All metrics are always reported. 


| Metric | Description | 
| --- | --- | 
| BytesDropCountBlackhole |  The number of bytes dropped because they matched a `blackhole` route. **Statistics**: The only meaningful statistic is `Sum`.  | 
| BytesDropCountNoRoute |  The number of bytes dropped because they did not match a route. **Statistics**: The only meaningful statistic is `Sum`.  | 
| BytesIn |  The number of bytes received by the core network. **Statistics**: The only meaningful statistic is `Sum`.  | 
| BytesOut |  The number of bytes sent from the core network. **Statistics**: The only meaningful statistic is `Sum`.  | 
| PacketsIn |  The number of packets received by the core network. **Statistics**: The only meaningful statistic is `Sum`.  | 
| PacketsOut |  The number of packets sent by the core network. **Statistics**: The only meaningful statistic is `Sum`.  | 
| PacketDropCountBlackhole |  The number of packets dropped because they matched a `blackhole` route. **Statistics**: The only meaningful statistic is `Sum`.  | 
| PacketDropCountNoRoute |  The number of packets dropped because they did not match a route. **Statistics**: The only meaningful statistic is `Sum`.  | 
| PacketDropTTLExpired |  The number of packets dropped because the TTL expired. **Statistics**: The only meaningful statistic is `Sum`.  | 

### Cloud WAN metric dimensions
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 Filter metric data by a combination of the following Cloud WAN core network metric dimensions.


| Dimension | Description | 
| --- | --- | 
| CoreNetwork, EdgeLocation | Filters the metric data by core network. | 
| Attachment, CoreNetwork | Filters the metric data by core network attachment. | 
| AvailabilityZone, CoreNetwork, EdgeLocation | Filters the metric data by availability zone. This is only applicable for Direct Connect. | 
| Attachment, AvailabilityZone, CoreNetwork | Filters the metric data by both core network attachment and availability zone. | 

## AWS Cloud WAN usage metrics
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Cloud WAN usage metrics correspond to AWS service quotas for Cloud WAN. You can configure alarms that alert you when your usage approaches a service quota. For more information about CloudWatch integration with service quotas, see [CloudWatch usage metrics](https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch-Usage-Metrics.html) in the *Amazon CloudWatch User Guide*.

The `AWS/Usage` namespace reports the following metric for Cloud WAN:


| Metric | Description | 
| --- | --- | 
| ResourceCount | The number of the specified resources running in your account. The resources are defined by the dimensions associated with the metric.**Statistics**: The only meaningful statistic is `MAXIMUM`. | 

### AWS Cloud WAN metric dimensions
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 The following dimensions are used to refine the usage metrics that are published by Cloud WAN.


| Dimension | Description | 
| --- | --- | 
| Service | The name of the AWS service containing the resource. For Cloud WAN usage metrics, the value for this dimension is NetworkManager. | 
| Type | The type of entity that is being reported. Currently, the only valid value for Cloud WAN usage metrics is Resource. | 
| Resource | The type of resource that is running. Currently, valid values for Cloud WAN usage metrics include RoutesPropagated/Inbound and RoutesPropagated/Outbound, which return the number of routes advertised and learnt over Direct Connect attachments. | 
| ResourceID | The unique identifier for the resource, such as a core network attachmentId, and might include a region code prefix for region-specific resources. | 
| Class | This dimension is reserved for future use. |