On the 2020-04-01 and over the following days we will start to update Paris Instances DNS resolvers.
All Instances running in Paris will be impacted.
The impact though is pretty low.
At some point your Instance DNS resolvers will go from 10.1.94.8 and 10.1.94.9 to 10.5.28.129 and 10.5.28.130.
The migration will be done progressively with no service interruption.
If you didn't customize your DNS servers, you don't have anything to do.
If you experience name resolution problems, only check that you use the newest resolvers and you will be good to go !