SDL Tridion 2011/2013 CD logback configuration example for SmartTarget. I use this to troubleshoot SmartTarget on the development presentation server. Deploy this example as logback.xml on the web server.

SmartTarget logback config example.xml

    <?xml version="1.0" encoding="UTF-8"?>
    <configuration scan="true">
    
        <!-- Properties -->
        <property name="log.pattern" value="%date %-5level %logger{0} - %message%n"/>
        <property name="log.history" value="7"/>
        <property name="log.folder" value="/home/tnwin/tnsmart/log"/>
        <property name="log.level" value="INFO"/>

        <!-- Appenders -->
        <appender name="rollingCoreLog" class="ch.qos.logback.core.rolling.RollingFileAppender">
            <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
                <fileNamePattern>${log.folder}/cd_core.%d{yyyy-MM-dd}.log</fileNamePattern>
                <maxHistory>${log.history}</maxHistory>
            </rollingPolicy>
            <encoder>
                <pattern>${log.pattern}</pattern>
            </encoder>
            <prudent>true</prudent>
        </appender>
        <appender name="rollingSmartTargetLog" class="ch.qos.logback.core.rolling.RollingFileAppender">
            <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
                <fileNamePattern>${log.folder}/smarttarget.%d{yyyy-MM-dd}.log</fileNamePattern>
                <maxHistory>${log.history}</maxHistory>
            </rollingPolicy>
            <encoder>
                <pattern>${log.pattern}</pattern>
            </encoder>
            <prudent>true</prudent>
        </appender>
        
        <!-- Loggers -->
        <!-- Custom cartridge -->
        <logger name="com.mycompanyname..tridion.somecustomcartridge" level="${log.level}">
            <appender-ref ref="rollingSmartTargetLog"/>
        </logger>

        <!-- Tridion SmartTarget -->
        <logger name="com.tridion.smarttarget" level="${log.level}">
                <appender-ref ref="rollingSmartTargetLog"/>
        </logger>
        <!-- SmartTarget .Net logs through Juggernet -->
        <logger name="Tridion.SmartTarget" level="${log.level}">
            <appender-ref ref="rollingSmartTargetLog"/>
        </logger>

        <!-- Tridion AmbientDataFramework -->
        <logger name="com.tridion.ambientdata" level="${log.level}">
            <appender-ref ref="rollingSmartTargetLog"/>
        </logger>
        <logger name="com.tridion.smarttarget.ambientdata" level="${log.level}">
            <appender-ref ref="rollingSmartTargetLog"/>
        </logger>

        <!-- Standard Tridion loggers -->
        <logger name="com.tridion" level="${log.level}"/>
        <root level="OFF">
            <appender-ref ref="rollingCoreLog"/>
        </root>
    </configuration>