Logback Config Example

logback.xml

<configuration debug="true" scan="true" scanPeriod="30 seconds">

  <!-- URL : https://logback.qos.ch/manual/configuration.html -->
  
  <!-- URL : https://logback.qos.ch/manual/appenders.html -->
  
  <!-- URL : https://logback.qos.ch/manual/layouts.html -->
 
  <!-- STDOUT -->
  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    <encoder>
      <!--pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern-->
      <pattern>%d{HH:mm:ss.SSS} %-5level %logger - %msg%n%ex{full}</pattern>
    </encoder>
  </appender>
  
  <!-- Simple File -->
  <appender name="File" class="ch.qos.logback.core.FileAppender">
    <file>${application.home:-.}/var/application.log</file>
    <encoder>
      <pattern>%date [%level] from %logger in %thread - %message%n%xException</pattern>
    </encoder>
  </appender>

  <!-- ROLLING -->
  <appender name="ROLLING" class="ch.qos.logback.core.rolling.RollingFileAppender">
    <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
      <!-- daily rollover -->
      <fileNamePattern>/var/log/service.%d{yyyy-MM-dd}.log</fileNamePattern>
      <!-- keep 30 days' worth of history capped at 3GB total size -->
      <maxHistory>7</maxHistory>
      <totalSizeCap>1GB</totalSizeCap>
    </rollingPolicy>
    <encoder>
      <pattern>%d{HH:mm:ss.SSS} %-5level %logger - %msg\n%ex{full}</pattern>
    </encoder>
  </appender>
  
  <!-- Syslog + Filtering -->
  <appender name="Alert" class="ch.qos.logback.classic.net.SyslogAppender">
    <syslogHost>localhost</syslogHost>
    <port>514</port>
    <facility>LOCAL3</facility>
    <suffixPattern>%level %msg%n</suffixPattern>
    <filter class="ch.qos.logback.classic.filter.LevelFilter">
      <level>WARN</level>
      <onMatch>ACCEPT</onMatch>
      <onMismatch>DENY</onMismatch>
    </filter>
  </appender>

  
  <!-- Async -->
  <appender name="Async?" class="ch.qos.logback.classic.AsyncAppender">
    <appender-ref ref="?" />
  </appender>
  
  <!-- LOGGER -->
  <logger name="logger-name" level="OFF|..|INFO|..|ERROR" additivity="[true]|false">
    <!--
        Aditivity; default: true (duplicate); other values: false(don't duplicate)
        https://logback.qos.ch/manual/configuration.html#overrridingCumulativity
    -->
    <appender-ref ref="appender-name" />
  </logger>
  
  <logger name="org.apache.kafka.clients.producer.ProducerConfig" level="info">
    <appender-ref ref="debuger" />
  </logger>
  
  <!-- ROOT -->
  <root level="INFO">
    <appender-ref ref="STDOUT" />
  </root>
  
</configuration>