The eZ Odoscope documentation, https://confluence.ez.no/display/ODC/Setting+up+eZ+odoscope, doesn't mention that is needed read access to /var/log/apache2/access.log file by the user that will run cronjob. IF you don't give permission to that user you'll get the following message

Running cronjob part 'updatelog'
Running extension/ezodoscope/cronjobs/ezupdatelog.php at: 03/02/2014 2:09 pm
Starting...
Access-Log not available. Wrong path?