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Hello.
I think it's related to "amazon-ec2-net-utils".
https://github.com/amazonlinux/amazon-ec2-net-utils/tree/main
"refresh-policy-routes" is defined in the systemd configuration below.
https://github.com/amazonlinux/amazon-ec2-net-utils/blob/main/systemd/system/refresh-policy-routes%40.service
A shell script called "setup-policy-routes" is executed in the systemd settings.
As far as I can see the contents of the shell script, I don't think it is doing anything harmful to EC2, so I think it's safe to rest assured.
https://github.com/amazonlinux/amazon-ec2-net-utils/blob/main/bin/setup-policy-routes.sh
It seems that network settings (ENI, etc.) can be automatically configured on the OS side in order to run EC2 on VPC.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/best-practices-for-configuring-network-interfaces.html
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Thank you for the info.