logback.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <include resource="org/springframework/boot/logging/logback/defaults.xml"/>
    <springProperty scope="context" name="springAppName" source="spring.application.name"/>

    <appender name="JSON" class="ch.qos.logback.core.ConsoleAppender">
        <encoder class="net.logstash.logback.encoder.LoggingEventCompositeJsonEncoder">
            <providers>
                <pattern>
                    <pattern>
                        {
                        "timestamp_app": "%d{YYYY-MM-dd'T'HH:mm:ss.SSSZ}",
                        "log_type": "APPLICATION",
                        "log_level": "%level",
                        "thread": "%thread",
                        "service": "${springAppName:-}",
                        "trace": "%X{traceId:-}",
                        "span": "%X{spanId:-}",
                        "class": "%logger{1000}",
                        "external_id": "%X{external.id:-}",
                        "message": "%message",
                        "stack_trace": "%throwable"
                        }
                    </pattern>
                </pattern>
            </providers>
        </encoder>
    </appender>
    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} [%X{traceId},%X{spanId}] %X{external.id} [%t] %-5level %logger{36} - %msg%n</pattern>
        </encoder>
    </appender>

    <root level="${LOG_LEVEL:-info}">
        <!-- Env: LOG_APPENDER options: JSON, CONSOLE -->
        <appender-ref ref="${LOG_APPENDER:-CONSOLE}"/>
    </root>

</configuration>