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Amazon CloudWatch now supports network health indicator for TGW inter-Region peering using synthetic monitors

Published
September 10, 2026
https://aws.amazon.com/about-aws/whats-new/2026/09/cloudwatch-network-monitoring-tgw-support/

Amazon CloudWatch Network Monitoring Updates

With synthetic monitors in Amazon CloudWatch Network Monitoring, you can now determine whether a network performance issue on a path that crosses an AWS Transit Gateway inter-Region peering connection is caused by the AWS network. This helps network operators and application developers cut the time spent isolating the source of degradation on these paths.

Previously, for synthetic monitors, the network health indicator (NHI) covered only paths that connect through AWS Direct Connect. With this release, synthetic monitors extend it to paths that reach a destination in a peered Region over Transit Gateway inter-Region peering. For these paths, the indicator reflects the health of the AWS network path up to the Transit Gateway peering connection, and is published to your Amazon CloudWatch account so you can build dashboards and set alarms.

This feature is available in all AWS Regions, except the AWS GovCloud (US) Regions and the China Regions.

Source: AWS release notes




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