Do we have Layout Pattern tag support for OpenTelemetryAppender in logback file?

[ff-amarkande]

Hi Team,

Trying to format the log message with custom layout for example, refer following logback file

<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
		<layout class="com.custom.logging.CustomPatternLayout">
			<pattern>%date %level [%thread] %logger{36} [%file:%line] [requestId=%X{requestId}] %msg%n </pattern>
		</layout>
</appender>

Custom layout code - Created CustomPatternLayout class for formatting by extending PatternLayout class

 defaultConverterMap.put( "msg", CustomMessageConverter.class.getName() ); 

Code
`public class CustomMessageConverter
extends MessageConverter {

/**
 * @see ch.qos.logback.core.pattern.Converter#convert(java.lang.Object)
 */
@Override
public String convert( ILoggingEvent event ) {
    return super.convert( new LoggingEventWrapper( event ) ).replace( System.getProperty( "line.separator" ), "" );
}

private static class LoggingEventWrapper
    implements ILoggingEvent {
    private ILoggingEvent event;
    private String formattedMessage = null;

    public LoggingEventWrapper( ILoggingEvent event ) {
        super();
        this.event = event;
    }

    @Override
    public String getThreadName() {
        return event.getThreadName();
    }

    @Override
    public Level getLevel() {
        return this.event.getLevel();
    }

    @Override
    public String getMessage() {
        return this.event.getMessage();
    }

    @Override
    public Object[] getArgumentArray() {
        return LoggingUtil.encloseInQuotes( event.getArgumentArray() );
    }

    @Override
    public String getFormattedMessage() {

        if ( null != formattedMessage ) {
            return formattedMessage;
        }
        formattedMessage = event.getMessage();
        if ( event.getArgumentArray() != null ) {
            if ( event.getArgumentArray()[0] instanceof LoggingEvents ) {
                LoggingEvents e = (LoggingEvents)event.getArgumentArray()[0];
                 formattedMessage = // method to format and create a custom log with key=value pair
            } else {
                formattedMessage = MessageFormatter.arrayFormat( event.getMessage(), LoggingUtil.encloseInQuotes( event.getArgumentArray() ) ).getMessage();
            }
        }
        return formattedMessage;
    }
 //Removed other override methods
}`

However when tried with OpenTelemetryAppender , log message is not formatted as per the layout.

<appender name="OTEL" class="io.opentelemetry.instrumentation.logback.appender.v1_0.OpenTelemetryAppender"> 
       <captureExperimentalAttributes>true</captureExperimentalAttributes>
       <captureCodeAttributes>true</captureCodeAttributes>
       <captureMarkerAttribute>true</captureMarkerAttribute>
       <captureKeyValuePairAttributes>true</captureKeyValuePairAttributes>
       <captureLoggerContext>true</captureLoggerContext>
       <captureMdcAttributes>*</captureMdcAttributes>
       <appender-ref ref="CONSOLE" />
   <layout class="com.custom.logging.customPatternLayout">
   	<pattern>%date %level [%thread] %logger{36} [%file:%line] [requestId=%X{requestId}] %msg%n </pattern>
   </layout>
     </appender>

Excepted
2024-06-28 12:59:51,360 INFO [localhost-startStop-1] EventLogger[SystemInfoProvider.java:54] [ requestId=Test-123] [eventChannel=CONFIGURATION, eventId=SYSTEM_INFO, message="Event to indicate system information", machineId=machine-id-1]

Actual
Event to indicate system information

Following is custom message formed inside getFormattedMessage method
[eventChannel=CONFIGURATION, eventId=SYSTEM_INFO, message="Event to indicate system information", machineId=machine-id-1]