Modify the file configuration/log4jconfig.xml as follows:
Add a new file appender for the runtime log:
<appender name="RuntimeLog" class="org.apache.log4j.DailyRollingFileAppender">
<param name="Threshold" value="DEBUG"/>
<param name="File" value="${user.dir}/logs/ivy.runtime.log"/>
<param name="DatePattern" value="'.'yyyy-MM-dd"/>
<layout class="org.apache.log4j.IvyLog4jLayout">
<param name="DateFormat" value="HH:mm:ss.SSS"/>
</layout>
</appender>
Then add a new category for the runtime log with the additivity attribute set to false and referencing the RuntimeLog appender:
<category name="runtimelog" class="ch.ivyteam.log.Logger" additivity="false">
<priority value="DEBUG"/>
<appender-ref ref="RuntimeLog"/>
</category>
Restart the engine.