Reports

I solve the problem, by not using '%property{RequestId}' in the AdditionalFields & ConversionPattern. Per default it sends all the defined properties from the log4net.*Context.Properties list.

<appender name="GelfUdpAppender" type="Gelf4Net.Appender.GelfUdpAppender, Gelf4Net">
  <remoteAddress value="..." /> 
  <remotePort value="12201" />
  <layout type="Gelf4Net.Layout.GelfLayout, Gelf4Net">
    <param name="AdditionalFields"  value="Level:%level,Thread:%thread" />
    <param name="ConversionPattern" value="Level:%level,Thread:%thread %n%m" />
  </layout>
</appender>

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