You may get a mail from cron complaining about “Pango-WARNING **: Invalid UTF-8 string passed to pango_layout_set_text()”, if you are running Munin. This is caused by Munin not receiving valid UTF-8 data.
For this you have 2 possible solutions:
1) Patch munin-graph manually using:
Note that the line numbers are a bit off if you are using another version.
2) Find the munin-node plugin that causes the problem(aka having some none utf-8 characters). Most likely it is the following line in the plugin hddtemp_smartctl:
print “graph_vlabel temp in °Cn”;
Change it to:
print “graph_vlabel temp in Cn”;
Restart the munin-node and you should not get more trouble, at least from that plugin.