AWS Transit Gateway and AWS Cloud WAN enhance visibility metrics and Path MTU support

AWS Transit Gateway (TGW) and AWS Cloud WAN now provide per-availability zone (AZ) metrics delivered to CloudWatch, offering more granular visibility into AZ-level metrics for VPC attachments. This allows customers to rapidly troubleshoot any AZ impairments and gain deeper visibility into AZ-level traffic patterns across TGW and Cloud WAN. Additionally, TGW and Cloud WAN now support Path Maximum Transmission Unit Discovery (PMTUD) for effective mitigation against MTU mismatch issues in their global networks. PMTUD support is available for both IPv4 and IPv6 packets and helps minimize packet loss due to MTU mismatches in the network. The per-AZ CloudWatch metrics and PMTUD support are available within each service in all AWS Regions where TGW or Cloud WAN are available. TGW and Cloud WAN allow customers to monitor their global network through performance and traffic metrics such as bytes in/out, packets in/out, and packets dropped. Until now, these metrics were available at an attachment level and aggregate TGW and Core Network Edge (CNE) levels. With this launch, customers have more detailed insights into their network's performance and traffic patterns. For more information, see the AWS Transit Gateway and AWS Cloud WAN documentation pages.