cps-service/src/main/resources/logback-spring.xml

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

    <include resource="org/springframework/boot/logging/logback/defaults.xml" />
    <include resource="org/springframework/boot/logging/logback/console-appender.xml" />

    <springProperty scope="context" name="springAppName" source="spring.application.name"/>
    <springProperty scope="context" name="username" source="security.auth.username"/>
    <springProperty scope="context" name="loggingFormat" source="logging.format"/>

    <property name="currentTimeStamp" value="%d{yyyy-MM-dd'T'HH:mm:ss.SSSXXX,UTC}"/>

    <appender name="jsonConsole"
              class="ch.qos.logback.core.ConsoleAppender">
        <encoder class="net.logstash.logback.encoder.LoggingEventCompositeJsonEncoder">
            <providers>
                <pattern>
                    <omitEmptyFields>true</omitEmptyFields>
                    <pattern>
                        {
                        "logTimeStamp": "${currentTimeStamp:-}",
                        "logTypeName": "",
                        "logLevel": "%level",
                        "traceId": "%X{traceId:-}",
                        "statusCode": "",
                        "principalId": "${username:-}",
                        "serviceName": "${springAppName:-}",
                        "message": "%message",
                        "spanId": "%X{spanId:-}",
                        "processId": "${PID:-}",
                        "threadName": "%thread",
                        "class": "%logger{40}",
                        "exception": "%wEx"
                        }
                    </pattern>
                </pattern>
            </providers>
        </encoder>
    </appender>

    <appender name="asyncConsole" class="ch.qos.logback.classic.AsyncAppender">
        <if condition='property("loggingFormat").equalsIgnoreCase("json")'>
            <then>
                <appender-ref ref="jsonConsole"/>
            </then>
            <else>
                <appender-ref ref="CONSOLE"/>
            </else>
        </if>
    </appender>

    <root level="INFO">
        <appender-ref ref="asyncConsole"/>
    </root>

</configuration>