error mrtgd
 

The Mrtgd functions a certain time normally.

After some days when I go to restart the service appears the following error:

how are you restarting the service?

looks to me like you are just killing the mrtgd process and starting it up again.

If I kill my mrtg process and then bring it up again I get the same log entries.

just looks like an unclean exit, not graceful, although I don't expect its anything to worry about.