AWS Availability Zone use1-az4 in US-EAST-1 Region is Impaired

Update timeline

1. identified May 08, 2026, 02:24 AM UTC

   AWS Availability Zone use1-az4 in US-EAST-1 region is impaired. For some clusters in AWS US-EAST-1 region, cluster nodes in that availability zone may have impaired health. Some Atlas operations, including instance scaling and cluster configuration changes, may also be delayed for clusters in AWS US-EAST-1. Please see https://health.aws.amazon.com/health/status for more information.

2. monitoring May 08, 2026, 03:12 AM UTC

   AWS Availability Zone use1-az4 in US-EAST-1 region is still impaired and AWS is working to restore the full availability of the availability zone. The Atlas system is taking healing actions on impacted nodes where possible to restore node health. We continue to monitor the situation. Please see https://health.aws.amazon.com/health/status for more information.

3. monitoring May 08, 2026, 12:34 PM UTC

   AWS continues to make progress to restore the full availability of the availability zone. The Atlas system is taking healing actions on impacted nodes where possible to restore node health. We continue to monitor the situation. Please see https://health.aws.amazon.com/health/status for more information.

4. monitoring May 08, 2026, 08:41 PM UTC

   AWS continues to work towards full recovery. The Atlas system has been successfully taking healing actions on impacted nodes to restore node health and using healthy availability zones for provisioning new nodes. We continue to monitor the situation. Please see https://health.aws.amazon.com/health/status for more information.

5. resolved May 09, 2026, 02:24 PM UTC

   This incident has been resolved.