To configure logback for the JobScheduler engine put a logback configuration into a directory of you choice and reference it by setting the java system property logback.configurationFile, e.g. -ea -Dlogback.configurationFile=etc/logback.xml.
A sample configuration:
<configuration>
<appender name="STDERR" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d\{dd HH:mm:ss.SSS\} [%thread] %-5level %logger - %msg%n</pattern>
</encoder>
</appender>
<root level="INFO">
<appender-ref ref="STDERR" />
</root>
<logger name="JobScheduler" level="TRACE"/>
<logger name="com.sos.scheduler.engine" level="INFO"/>
<logger name="com.sos.scheduler.engine.common.async" level="DEBUG"/>
<logger name="com.sos.scheduler.engine.eventbus" level="INFO"/>
<logger name="com.sos.scheduler.engine.kernel.async" level="DEBUG"/>
<logger name="org.eclipse.jetty" level="INFO"/>
</configuration>