/usr/lib/rpm/fileattrs/mono.attr is in rpm 4.12.0.2+dfsg1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | %__mono_provides %{_rpmconfigdir}/mono-find-provides %{_builddir}/%{?buildsubdir} %{buildroot} %{_libdir}
%__mono_requires %{_rpmconfigdir}/mono-find-requires %{_builddir}/%{?buildsubdir} %{buildroot} %{_libdir}
%__mono_magic Mono/.Net assembly
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