@paygb 

You are absolutely correct, the Cloudera Manager configuration property within NiFi configurations fro logback.xml does require you to input the entire logbck.xml and then add your modifications.

Adding a new logger for the ControllerStatusReportingTask would require adding a logger like this:

<logger name="org.apache.nifi.controller.ControllerStatusReportingTask" level="DEBUG"/>

You can add this logger in line along with other loggers already in the logback.xml

The result would be all logging from this class at a DEBUG level and below would go in to the nifi-app.log.

You could optionally add an additional appender (NiFi has three existing appender now for the nifi-app.log, nifi-user.log and nifi-bootstrap.log files).  You can copy and modify one of those and the your logger would need to look like this:

  <logger name="org.apache.nifi.controller.ControllerStatusReportingTask" level="DEBUG" additivity="false">
    <appender-ref ref="NEW_APPENDER"/>
  </logger>

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Thank you,

Matt