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It's looking like an AWS outage
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"We can confirm a loss of power within a single data center within a single Availability Zone (USE1-AZ4) in the US-EAST-1 Region. This is affecting availability and connectivity to EC2 instances that are part of the affected data center"
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"5:39 AM PST We have now restored power to all instances and network devices within the affected data center and are seeing recovery for the majority of EC2 instances and EBS volumes within the affected Availability Zone. Network connectivity [...] has also returned to normal..."