this morning, I get warnings that the file repomd.xml from some repos
has been signed with an unknown key.
What's gone wrong? Did I miss something? The repo's URLs all start with
<http://download.opensuse.org/repositories/>, and there are several
repos that have their repomd.xml signed with the usual key.
BTW, I'm not asked to accept a changed key for the repos, so the repo
keys should be unchanged, just those files have been signed with other keys.