Amazon announced EOL for Amazon Linux AMI.
https://aws.amazon.com/de/amazon-linux-ami/
It's important to do an audit of all instance reservations in your platform and migrate away from these images before the announce date.
The steps below should provide a list of instance reservations still using Amazon Linux AMI
https://docs.aws.amazon.com/AWSEC2/lastest/UserGuide/amazon-linux-ami-basics.html
aws ec2 describe-images \
--owners=amazon \
--filters "Name=name,Values=*amzn-ami-hvm*" \
--query "[{Name:'image-id',Values:Images[*].ImageId}]" \
--region=eu-central-1
--output=json
> amis_filter.json
aws ec2 describe-instances --filter file://amis_ids.txt