On http://www.zabbix.com/documentation/1.8/manual/about/what_s_new#logfile_filtering_on_agent_and_server_side information is available: "To avoid storing in the database unneeded logfile entries, they can be filtered on server side."
I know how filtering on the Agent side and how to use it, but how to use filtering on server side (to avoid storing in the database unneeded logfile entries)? where i can read about this?