We have some older mysql servers from older, already retired clusters, that are aging and must be offloaded to new mysql servers to avoid any hardware failures from aging hardware, and for customers to receive newer, faster mysql servers.
A list of the older servers follows, and then:
The new mysql servers are modern hardware, much more powerful and hold many more databases, which becomes a problem for moving customers who created databases before our more strict policy on database naming. Previously we allowed any name as long as it was not taken on that specific mysql server, but since a few years we have made it a requirement for names to be unique system-wide for new databases. Now these names may conflict on the new servers and require a rename to complete.
For the curious: my own databases (I have seven) had been on one of the affected machines, but were moved to a newer box two years ago. And my own naming conventions are probably sufficiently weird to avoid landing on someone else’s chosen name.