the-algorithm/timelineranker/server/src/main/resources/logback-timelineranker.xml

<configuration>
  <shutdownHook class="ch.qos.logback.core.hook.DelayingShutdownHook"/>
  <property name="async_queue_size" value="${queue.size:-50000}"/>
  <property name="async_max_flush_time" value="${max.flush.time:-0}"/>
  <property name="SERVICE_OUTPUT" value="${log.service.output:-server.log}"/>
  <property name="DEBUG_TRANSCRIPTS_OUTPUT"
            value="${log.debug_transcripts.output:-debug_transcripts.log}"/>
  <property name="DEFAULT_SERVICE_PATTERN"
            value="%5p [%d{yyyyMMdd-HH:mm:ss.SSS}] %logger{0}: %m%n"/>
  <!-- JUL/JDK14 to Logback bridge -->
  <contextListener class="ch.qos.logback.classic.jul.LevelChangePropagator">
    <resetJUL>true</resetJUL>
  </contextListener>

  <!-- Service Log -->
  <appender name="SERVICE" class="ch.qos.logback.core.rolling.RollingFileAppender">
    <file>${SERVICE_OUTPUT}</file>
    <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
      <!-- daily rollover -->
      <fileNamePattern>${SERVICE_OUTPUT}.%d.%i.gz</fileNamePattern>
      <maxFileSize>500MB</maxFileSize>
      <!-- keep 21 days' worth of history -->
      <maxHistory>21</maxHistory>
      <cleanHistoryOnStart>true</cleanHistoryOnStart>
    </rollingPolicy>
    <encoder>
      <pattern>${DEFAULT_SERVICE_PATTERN}</pattern>
    </encoder>
  </appender>

  <!-- debug transcripts -->
  <appender name="DEBUG-TRANSCRIPTS" class="ch.qos.logback.core.rolling.RollingFileAppender">
    <file>${DEBUG_TRANSCRIPTS_OUTPUT}</file>
    <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
      <!-- daily rollover -->
      <fileNamePattern>${DEBUG_TRANSCRIPTS_OUTPUT}.%d.%i.gz</fileNamePattern>
      <maxFileSize>500MB</maxFileSize>
      <!-- keep 21 days' worth of history -->
      <maxHistory>21</maxHistory>
      <cleanHistoryOnStart>true</cleanHistoryOnStart>
    </rollingPolicy>
    <encoder>
      <pattern>${DEFAULT_SERVICE_PATTERN}</pattern>
    </encoder>
  </appender>

  <!-- LogLens/splunk -->
  <appender name="LOGLENS" class="com.twitter.loglens.logback.LoglensAppender">
    <mdcAdditionalContext>true</mdcAdditionalContext>
    <category>loglens</category>
    <index>${log.lens.index:-timelineranker}</index>
    <tag>${log.lens.tag}</tag>
    <encoder>
      <pattern>%msg%n</pattern>
    </encoder>
    <filter class="com.twitter.strato.logging.logback.RegexFilter">
      <forLogger>manhattan-client</forLogger>
      <excludeRegex>.*InvalidRequest.*</excludeRegex>
    </filter>
  </appender>

  <!-- ===================================================== -->
  <!-- Primary Async Appenders -->
  <!-- ===================================================== -->

  <appender name="ASYNC-SERVICE" class="ch.qos.logback.classic.AsyncAppender">
    <queueSize>${async_queue_size}</queueSize>
    <maxFlushTime>${async_max_flush_time}</maxFlushTime>
    <appender-ref ref="SERVICE"/>
  </appender>

  <appender name="ASYNC-DEBUG-TRANSCRIPTS" class="ch.qos.logback.classic.AsyncAppender">
    <queueSize>${async_queue_size}</queueSize>
    <maxFlushTime>${async_max_flush_time}</maxFlushTime>
    <appender-ref ref="DEBUG-TRANSCRIPTS"/>
  </appender>

  <appender name="ASYNC-LOGLENS" class="ch.qos.logback.classic.AsyncAppender">
    <queueSize>${async_queue_size}</queueSize>
    <maxFlushTime>${async_max_flush_time}</maxFlushTime>
    <appender-ref ref="LOGLENS"/>
  </appender>

  <!-- ===================================================== -->
  <!-- Package Config -->
  <!-- ===================================================== -->

  <!-- Per-Package Config -->
  <logger name="OptimisticLockingCache" level="off"/>
  <logger name="ZkSession" level="info"/>
  <logger name="com.twitter" level="info"/>
  <logger name="com.twitter.decider.StoreDecider" level="warn"/>
  <logger name="com.twitter.distributedlog.client" level="warn"/>
  <logger name="com.twitter.finagle.liveness" level="warn"/>
  <logger name="com.twitter.finagle.mtls.authorization.config.AccessControlListConfiguration" level="warn"/>
  <logger name="com.twitter.finagle.mux" level="warn"/>
  <logger name="com.twitter.finagle.serverset2" level="warn"/>
  <logger name="com.twitter.finatra.kafka.common.kerberoshelpers" level="warn"/>
  <logger name="com.twitter.finatra.kafka.utils.BootstrapServerUtils" level="warn"/>
  <logger name="com.twitter.logging.ScribeHandler" level="warn"/>
  <logger name="com.twitter.server.coordinate" level="error"/>
  <logger name="com.twitter.wilyns" level="warn"/>
  <logger name="com.twitter.zookeeper.client" level="info"/>
  <logger name="com.twitter.zookeeper.client.internal" level="warn"/>
  <logger name="manhattan-client" level="warn"/>
  <logger name="org.apache.kafka.clients.NetworkClient" level="error"/>
  <logger name="org.apache.kafka.clients.consumer.internals" level="error"/>
  <logger name="org.apache.kafka.clients.producer.internals" level="error"/>
  <logger name="org.apache.kafka.common.network" level="warn"/>
  <logger name="org.apache.zookeeper" level="error"/>
  <logger name="org.apache.zookeeper.ClientCnxn" level="warn"/>

  <!-- Root Config -->
  <root level="${log_level:-INFO}">
    <appender-ref ref="ASYNC-SERVICE"/>
    <appender-ref ref="ASYNC-LOGLENS"/>
  </root>

  <!-- debug transcripts: logger name MUST be c.t.timelines.util.debuglog.DebugLog.DebugTranscriptsLog -->
  <logger name="DebugTranscripts" level="info">
    <appender-ref ref="ASYNC-DEBUG-TRANSCRIPTS"/>
    <appender-ref ref="ASYNC-LOGLENS"/>
  </logger>
</configuration>