Munin and Dreambox DM500HD

I bought DM500HD a few months ago.  Since it's always on, I intended to install munin monitoring on it.  The problem is it does not have Perl bundled.
First I wanted to install Perl (I even tried to install mipsel packages from Debian and it kind of worked), but then I found muninlite which perfectly fit my need.
I developed 2 new plugins to monitor its temperature and fan speed.

Munin/rrdtool spike removal

Occasionally I see spikes on my network card charts. I found this article which says how to remove them and basically it shows how to convert the rrd file to xml and vice versa, so it's worth remembering.

cd /var/lib/munin/HOSTNAME

# To export rrd file to xml, use
rrdtool dump file.rrd > file.rrd.xml

# Move the rrd file to backup
mv file.rrd file.rrd.bak

# To convert from xml to rrd, use:
rrdtool restore -r file.rrd.xml file.rrd

# In case running under different user (e.g. root), don't forget to change back the ownership of rrd files:
chown munin:munin file.rrd

# To regenerate graphs, run as munin:
/usr/share/munin/munin-graph --nolazy --host $HOSTNAME --force