I was trying to report a bug in a package (gnome-settings-daemon) and it would be useful to have debuginfo for this package. When running dnf debuginfo-install gnome-settings-daemon, I'm getting an error that the repomd.xml was not found in metalink. Therefore I manually downloaded the metalink file from https://mirrors.fedoraproject.org/metalink?repo=updates-released-debug-f25&arch=x86_64 (URL from /etc/yum.repos.d/fedora-updates.repo file) and had a look at the file. The file itself just contains this content:

{{{
<metalink version="3.0" xmlns="<a href="http://www.metalinker.org/"">http://www.metalinker.org/" type="dynamic" pubdate="Wed, 31 Aug 2016 21:05:11 GMT" generator="mirrormanager" xmlns:mm0="http://fedorahosted.org/mirrormanager">
<!--

repo = updates-released-debug-f25 arch = x86_64 error: invalid repo or arch

following repositories are available:

repo=atomic-21&arch=x86_64

repo=core-2&arch=i386

repo=core-2&arch=x86_64

}}}
… (more repositories listed) …
{{{

repo=updates-testing-source-fc4&arch=source

repo=updates-testing-source-fc5&arch=source

repo=updates-testing-source-fc6&arch=source

-->
</metalink>
}}}

but the file does not contain a line like

repo=updates-released-debug-f25&arch=x86_64

but it contains everything else: different architectures:

{{{
…

repo=updates-released-debug-f25&arch=aarch64

repo=updates-released-debug-f25&arch=ppc64

repo=updates-released-debug-f25&arch=ppc64le

repo=updates-released-debug-f25&arch=s390x

…
}}}
different repos:
{{{
…

repo=fedora-debug-25&arch=x86_64

…

repo=updates-released-f25&arch=x86_64

…

repo=updates-released-source-f25&arch=source

…

repo=updates-testing-debug-f25&arch=x86_64

…
}}}
the repo I'd need is just missing.

I originally reported this to https://lists.fedoraproject.org/archives/list/infrastructure@lists.fedoraproject.org/thread/LUDEXSN4GJDTLBAYZEHQV2YARRRV3S43/ and was given a hint to tell releng which I do hereby.