Internal logging for log4net

app.exe.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
...
  <appSettings>
    <add key="log4net.Internal.Debug" value="true"/>
  </appSettings>
  <system.diagnostics>
    <trace autoflush="true">
      <listeners>
        <add 
          name="textWriterTraceListener" 
          type="System.Diagnostics.TextWriterTraceListener" 
          initializeData="C:\logs\log4net.txt" />
      </listeners>
    </trace>
  </system.diagnostics>
...  
</configuration>

Maybe you know how it works on .net core?