In log4j 1.2 to log4j 2 migration, what to do with the DailyRollingFileAppender class?

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You are looking for the RollingFile appender 

<RollingFile name="DAILY_LOG" fileName="log/daily.log"
                 filePattern="log/%d{ddMMyyyy}_daily.log"
                 >
      <PatternLayout pattern="%d [%7r] %5p - %c - %m%n"/>
      <Policies>
        <TimeBasedTriggeringPolicy interval="1"/>
      </Policies>                               
</RollingFile>

The previous sample rolls over by day, the interval being 1 unit which is determined by the smallest unit of the date lookup in the file pattern. In other words if the date pattern was d{MMyyyy},then the interval=1 corresponds to a rollover period of 1 month.

Please note there currently is no support for limiting the number of log files kept past a certain date or age etc. You can only limit the number of log files per time period.

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