Configure Play2.2/Scala logging format as LTSV (Labeled Tab-separated Values).

application-logger.xml

<configuration>
    <conversionRule conversionWord="coloredLevel" converterClass="play.api.Logger$ColoredLevel" />
    <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${application.home}/logs/application.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${application.home}/logs/application.%d{yyyy-MM-dd}.log</fileNamePattern>
            <maxHistory>14</maxHistory>
        </rollingPolicy>
        <encoder>
            <charset>UTF-8</charset>
            <pattern>time:%date{ISO8601}&#x9;level:%level&#x9;logger:%logger&#x9;thread:%thread&#x9;msg:%replace(%replace(%message){'\n','\\n'}){'\t',' '}&#x9;exception:%replace(%replace(%xException{5}){'\n','\\n'}){'\t',' '}%n%nopex</pattern>
            <immediateFlush>true</immediateFlush>
        </encoder>
    </appender>
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%coloredLevel %logger{15} - %message%n%xException{5}</pattern>
        </encoder>
    </appender>
    <logger name="play" level="INFO" />
    <logger name="application" level="INFO" />
    <root level="ERROR">
        <appender-ref ref="STDOUT" />
        <appender-ref ref="FILE" />
    </root>
</configuration>

	 meaning what?

I see, tab character https://www.w3.org/MarkUp/html3/latin1.html