This is an old revision of the document!
To filter out Library updates from debug log simple find the below code:
 <category name="org.serviio">
      <priority value="DEBUG"/>
</category>
and add the below code under it:
 <category name="org.serviio.library.local">
      <priority value="INFO"/>
</category>
<category name="org.serviio.library.online">
      <priority value="INFO"/>
</category>