The migration isn't transparent, IMDSv2 has been available for a while and they have been pushing for it using warning notifications in the console. AWS depreca

The migration isn't transparent, IMDSv2 has been available for a while and they have been pushing for it using warning notifications in the console. AWS deprecates things very slowly and usually avoid breaking changes. For instance, EC2 Classic stayed alive a very long time after they stopped selling it. Over years, they moved from alerting to changing the default and will later remove IMDSv1 for new instances. Even then, they will not remove it for the previous generations and those may stay for years, the current oldest is M4 which I think is from 2015.