Sample configuration to enable UDP log output stream in Sitecore. This file is copy and paste ready :)

Logging.Extension.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/" 
               xmlns:role="http://www.sitecore.net/xmlconfig/role/" 
               xmlns:set="http://www.sitecore.net/xmlconfig/">
  
  <!-- 
  This configuration enables log output streams to UDP on port 7071, which is the default 
  port for Log2Console. You can download Log2Console from: 
  https://github.com/Statyk7/log2console/releases (in the Source code zip, in the ./output folder)
  Alternatively you can get a copy of Log4View from https://www.log4view.com/.
  Read more details on the 2 tools: https://publications.soulcode.agency/you-dont-monitor-your-local-sitecore-instance-close-enough/
  -->
  
  <!-- Remove the Role if you're not on Sitecore 9 or higher -->
  <sitecore role:require="Standalone"> 
    <log4net>
      <root>
        <priority>
          <patch:delete/>
        </priority>
        
        <!-- Change this back to INFO, for default log output. -->
        <priority value="DEBUG" />
        
        <!--Register the UDP appender for default log output -->
        <appender-ref ref="UdpAppender" />
      </root>
      
      <!-- UDP Appender Configuration -->
      <appender name="UdpAppender" type="log4net.Appender.UdpAppender, Sitecore.Logging">
        <remoteAddress value="127.0.0.1" />
        <remotePort value="7071" />
        <layout type="log4net.Layout.XmlLayoutSchemaLog4j" />
      </appender>
      
      <!-- Register the UDP Appender with additionally registered loggers (in Sitecore) -->
      <logger name="Sitecore.Diagnostics.Publishing">
        <appender-ref ref="UdpAppender"/>
      </logger>
      <logger name="ClientRoot">
        <appender-ref ref="UdpAppender"/>
      </logger>
      <logger name="Sitecore.Diagnostics.Search">
        <appender-ref ref="UdpAppender"/>
      </logger>
      <logger name="Sitecore.Diagnostics.Crawling">
        <appender-ref ref="UdpAppender"/>
      </logger>
      <logger name="Sitecore.Owin.Diagnostics">
        <appender-ref ref="UdpAppender"/>
      </logger>
      <logger name="Sitecore.Analytics.Aggregation">
        <appender-ref ref="UdpAppender"/>
      </logger>
      <logger name="Sitecore.Xdb.Processing.ContactMerge.Logger">
        <appender-ref ref="UdpAppender"/>
      </logger>
      <logger name="Sitecore.FXM.Diagnostics">
        <appender-ref ref="UdpAppender"/>
      </logger>
      <logger name="Sitecore.EDS">
        <appender-ref ref="UdpAppender"/>
      </logger>
      <logger name="Sitecore.EXM">
        <appender-ref ref="UdpAppender"/>
      </logger>

      <!-- Register the UDP Appender with SPE -->
      <logger name="Cognifide.PowerShell">
        <appender-ref ref="UdpAppender"/>
      </logger>
      
    </log4net>
  </sitecore>
</configuration>