How to send a custom dynamic field to Graylog

[osiegmar]

1) Write your implementation

package mypackage;

import java.util.function.BiConsumer;

import ch.qos.logback.classic.spi.ILoggingEvent;
import de.siegmar.logbackgelf.GelfFieldMapper;

public class CustomFieldMapper implements GelfFieldMapper<String> {

    @Override
    public void mapField(ILoggingEvent event, BiConsumer<String, String> valueHandler) {
        valueHandler.accept("custom_log_seq", event.getSequenceNumber());
        valueHandler.accept("custom_logger_name", event.getLoggerName());
    }

}

2) Configure

<configuration>

    <appender name="GELF" class="de.siegmar.logbackgelf.GelfUdpAppender">
        <graylogHost>localhost</graylogHost>
        <graylogPort>12201</graylogPort>
        <encoder class="de.siegmar.logbackgelf.GelfEncoder">
            <fieldMapper class="mypackage.CustomFieldMapper"/>
        </encoder>
    </appender>

    <root level="debug">
        <appender-ref ref="GELF" />
    </root>

</configuration>

3) There is no step 3 😉