Custom logback.xml file for Spring Boot application and Environment variables for OpenTelemetry Agent

.env

JAVA_TOOL_OPTIONS="-javaagent:build/agent/opentelemetry-javaagent.jar"
OTEL_SERVICE_NAME="gout"
OTEL_EXPORTER_OTLP_ENDPOINT="http://localhost:4317"
OTEL_EXPORTER_OTLP_PROTOCOL="grpc"
OTEL_RESOURCE_ATTRIBUTES="service.name=gout,service.instance.id=gout,env=dev"
# Logs are disabled by default
OTEL_LOGS_EXPORTER="otlp"
OTEL_METRIC_EXPORT_INTERVAL=500
OTEL_BSP_SCHEDULE_DELAY=500

logback.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <include resource="org/springframework/boot/logging/logback/defaults.xml"/>
    <include resource="org/springframework/boot/logging/logback/console-appender.xml"/>
    <timestamp key="LOG_DATE" datePattern="yyyyMMdd"/>
    <property name="LOG_FILE" value="logs/application.log" />

    <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <encoder>
            <pattern>${FILE_LOG_PATTERN}</pattern>
        </encoder>
        <file>${LOG_FILE}</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
          <fileNamePattern>${LOG_FILE}.%d{yyyyMMdd}</fileNamePattern>
            <maxHistory>2</maxHistory>
        </rollingPolicy>
    </appender>

    <root level="INFO">
        <appender-ref ref="CONSOLE"/>
        <appender-ref ref="FILE"/>
    </root>

</configuration>