It appears this issue was either a monitoring false positive or very short-lived (despite Cloudwatch monitoring reporting issues, we did not observe any).
Jan 17, 12:31 EST
AWS has identified an intermittent network connectivity issue, but it appears to have abated. We will continue to monitor for any degraded performance.
Jan 17, 12:28 EST
EC2 instance health checks have failed on the affected instances, but some functionality appears intact. We continue to investigate to determine the impact on Aptible customers.
Jan 17, 12:22 EST
An EC2 availability incident is affecting several customer environments. So far, the incident appears to be affecting a single Availability Zone in us-west-1. We are working to recover affected instances and will update here as soon as we have more information.
Jan 17, 12:17 EST