By default the LogAttribute processor logs to the NiFi App log. It does this because processors are configured to log there by the default configuration in the logback.xml. In order to have a new file that just the LogAttribute Processor uses you can add a new Appender and Logger like so: <appender name="STATUS_LOG_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>logs/nifi-status.log</file>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<!--
For daily rollover, use 'user_%d.log'.
For hourly rollover, use 'user_%d{yyyy-MM-dd_HH}.log'.
To GZIP rolled files, replace '.log' with '.log.gz'.
To ZIP rolled files, replace '.log' with '.log.zip'.
-->
<fileNamePattern>./logs/nifi-status_%d.log</fileNamePattern>
<!-- keep 5 log files worth of history -->
<maxHistory>5</maxHistory>
</rollingPolicy>
<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
<pattern>%date %level [%thread] %logger{40} %msg%n</pattern>
</encoder>
</appender>
<logger name="org.apache.nifi.processors.standard.LogAttribute" level="INFO" additivity="false">
<appender-ref ref="STATUS_LOG_FILE" />
</logger>
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