After discussing the issue with Amazon EC2 engineers, we have concluded that these changes are permanent.
Posted Jan 15, 2021 - 01:08 UTC
You might have noticed some unexpected changes in your metrics around 9-10 December. We have not made any changes to our service. We believe the issue is due to changes in Amazon EC2. At this stage we believe the changes are permanent, however we're still in the process of investigating.