<appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">

        

        <prudent>true</prudent>

        

        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">

            

            <fileNamePattern>target/Test-%d{yyyy-MM-dd}.%i.log</fileNamePattern>

            

            <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">

                <maxFileSize>1KB</maxFileSize>

            </timeBasedFileNamingAndTriggeringPolicy>

            <maxHistory>30</maxHistory>

        </rollingPolicy>

        <encoder>

            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>

        </encoder>

    </appender>

I've tried this and logback doesn't complain and file does rollover but just wondering is the prudent flag used?