AWS Cloud WAN monitoring via Cloudwatch

AWS Cloud WAN provides monitoring capabilities through Amazon CloudWatch and Amazon EventBridge. To get more detailed monitoring for your Cloud WAN environment:

1. First, ensure you've onboarded CloudWatch Logs Insights for AWS Cloud WAN. This requires an IAM user with specific permissions including events:PutTargets, events:DescribeRule, logs:PutResourcePolicy, and several others. Once onboarded, you'll be able to view Events on the AWS Cloud WAN dashboards.

2. For more granular visibility, AWS Cloud WAN now supports per-availability zone (AZ) metrics delivered to CloudWatch. These metrics include bytes in/out, packets in/out, and packets dropped at the AZ level for VPC attachments, which can help you troubleshoot AZ impairments and understand traffic patterns.

3. Unlike Transit Gateway (TGW) flow logs which provide detailed source/destination IP and port information, Cloud WAN's standard metrics are more focused on attachment-level and Core Network Edge (CNE) level metrics.

4. If you need detailed traffic analysis similar to what TGW flow logs provide, you might need to implement VPC flow logs for the VPCs connected to your Cloud WAN. These logs can be filtered and analyzed using CloudWatch Logs Insights with custom queries.

5. For sending specific data to New Relic, you would typically use CloudWatch metric filters to extract and transform log data. If this isn't working as expected with Cloud WAN events, you might need to explore alternative approaches such as using Lambda functions to process the CloudWatch logs and forward the required data to New Relic.

The monitoring capabilities between TGW and Cloud WAN have some differences in terms of the granularity of information available in their respective flow logs, which explains why you're not seeing the source/destination IPs or ports in Cloud WAN events that you might be accustomed to with TGW Flow Logs.
Sources
AWS Cloud WAN events and metrics - AWS Network Manager
Onboard CloudWatch Logs Insights for AWS Cloud WAN - AWS Network Manager
AWS Transit Gateway and AWS Cloud WAN enhance visibility metrics and Path MTU support - AWS