the-algorithm/topic-social-proof/server/src/main/resources/logback.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}"/>
  <!-- ===================================================== -->
  <!-- Structured Logging -->
  <!-- ===================================================== -->
  <!-- Only sample 0.1% of the requests -->
  <property name="splunk_sampling_rate" value="${splunk_sampling_rate:-0.001}"/>
  <include resource="structured-logger-logback.xml"/>
  <!-- ===================================================== -->
  <!-- Service Config -->
  <!-- ===================================================== -->
  <property name="DEFAULT_SERVICE_PATTERN"
            value="%-16X{transactionId} %logger %msg"/>

  <!-- ===================================================== -->
  <!-- Common Config -->
  <!-- ===================================================== -->

  <!-- JUL/JDK14 to Logback bridge -->
  <contextListener class="ch.qos.logback.classic.jul.LevelChangePropagator">
    <resetJUL>true</resetJUL>
  </contextListener>

  <!-- Service Log (Rollover every 50MB, max 11 logs) -->
  <appender name="SERVICE" class="ch.qos.logback.core.rolling.RollingFileAppender">
    <file>${log.service.output}</file>
    <rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
      <fileNamePattern>${log.service.output}.%i</fileNamePattern>
      <minIndex>1</minIndex>
      <maxIndex>10</maxIndex>
    </rollingPolicy>
    <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
      <maxFileSize>50MB</maxFileSize>
    </triggeringPolicy>
    <encoder>
      <pattern>%date %.-3level ${DEFAULT_SERVICE_PATTERN}%n</pattern>
    </encoder>
  </appender>

  <!-- Strato package only log (Rollover every 50MB, max 11 logs) -->
  <appender name="STRATO-ONLY" class="ch.qos.logback.core.rolling.RollingFileAppender">
    <file>${log.strato_only.output}</file>
    <rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
      <fileNamePattern>${log.strato_only.output}.%i</fileNamePattern>
      <minIndex>1</minIndex>
      <maxIndex>10</maxIndex>
    </rollingPolicy>
    <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
      <maxFileSize>50MB</maxFileSize>
    </triggeringPolicy>
    <encoder>
      <pattern>%date %.-3level ${DEFAULT_SERVICE_PATTERN}%n</pattern>
    </encoder>
  </appender>

  <!-- LogLens -->
  <appender name="LOGLENS" class="com.twitter.loglens.logback.LoglensAppender">
    <mdcAdditionalContext>true</mdcAdditionalContext>
    <category>loglens</category>
    <index>${log.lens.index}</index>
    <tag>${log.lens.tag}/service</tag>
    <encoder>
      <pattern>%msg%n</pattern>
    </encoder>
    <turboFilter class="ch.qos.logback.classic.turbo.DuplicateMessageFilter">
      <cacheSize>500</cacheSize>
      <allowedRepetitions>50</allowedRepetitions>
    </turboFilter>
    <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-STRATO-ONLY" class="ch.qos.logback.classic.AsyncAppender">
    <queueSize>${async_queue_size}</queueSize>
    <maxFlushTime>${async_max_flush_time}</maxFlushTime>
    <appender-ref ref="STRATO-ONLY"/>
  </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 (shared) -->
  <logger name="com.twitter" level="info"/>

  <!--
    By default, we leave the strato package at INFO level.
    However, this line allows us to set the entire strato package, or a subset of it, to
    a specific level. For example, if you pass -Dstrato_log_package=streaming -Dstrato_log_level=DEBUG
    only loggers under com.twitter.strato.streaming.* will be set to DEBUG level. Passing only
    -Dstrato_log_level will set all of strato.* to the specified level.
  -->
  <logger name="com.twitter.strato${strato_log_package:-}" level="${strato_log_level:-INFO}"/>

  <logger name="com.twitter.wilyns" level="warn"/>
  <logger name="com.twitter.finagle.mux" level="warn"/>
  <logger name="com.twitter.finagle.serverset2" level="warn"/>
  <logger name="com.twitter.logging.ScribeHandler" level="warn"/>
  <logger name="com.twitter.zookeeper.client.internal" level="warn"/>
  <logger name="com.twitter.decider.StoreDecider" level="warn"/>

  <!-- Per-Package Config (Strato) -->
  <logger name="com.twitter.distributedlog.client" level="warn"/>
  <logger name="com.twitter.finagle.mtls.authorization.config.AccessControlListConfiguration" 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.server.coordinate" level="error"/>
  <logger name="com.twitter.zookeeper.client" level="info"/>
  <logger name="org.apache.zookeeper" level="error"/>
  <logger name="org.apache.zookeeper.ClientCnxn" level="warn"/>
  <logger name="ZkSession" level="info"/>
  <logger name="OptimisticLockingCache" level="off"/>
  <logger name="manhattan-client" level="warn"/>
  <logger name="strato.op" 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"/>
  <!-- produce a lot of messages like: Building client authenticator with server name kafka -->
  <logger name="org.apache.kafka.common.network" level="warn"/>

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

  <!-- Strato package only logging-->
  <logger name="com.twitter.strato"
          level="info"
          additivity="true">
    <appender-ref ref="ASYNC-STRATO-ONLY" />
  </logger>


</configuration>