I have just noticed that after last update munin does not collect any information anymore.
munin-node -v
munin-node (munin-node) version svn-trunk-r<UNKNOWN>.
Written by Audun Ytterdal, Jimmy Olsen, Tore Anderson / Linpro AS
Copyright (C) 2002-2009
This is free software released under the GNU General Public License. There
is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. For details, please refer to the file COPYING that is included
with this software or refer to
http://www.fsf.org/licensing/licenses/gpl.txt