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Hello.
You may receive such notifications when retirements, maintenance, or failures occur on the physical hosts used by EC2.
Basically, if automatic recovery is enabled as a response to a failure on a physical host, the EC2 will recover automatically.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-recover.html
However, in the event of an availability zone-level failure, it will be necessary to take action such as restoring the EC2 to a different subnet.
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