>Existing search.cpan.org links will continue to work after the transition.
They should get a lot more credit for this. Linkrot sucks, and I'm sure the effort that was required to pull off maintaining those links is going to pay off greatly for many for years to come.
I'm not very familiar with the Perl ecosystem, but that would be an entirely different domain; was the server behind it maintained by the the MetaCPAN people, or the cpan.org people?
It has been maintained by MetaCPAN people. Since this transition has been planned, extra work has been put it to make the redirects more comprehensive.
They should get a lot more credit for this. Linkrot sucks, and I'm sure the effort that was required to pull off maintaining those links is going to pay off greatly for many for years to come.