Output format JSON for Log4j2 log messages using OpentelemetryAppender in package io.opentelemetry.instrumentation.log4j.appender.v2_17

[TomEijk]

Hi,

I'm trying to send log messages in JSON format to my Opentelemetry Collector using this log4j2.xml file:

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN" packages="io.opentelemetry.instrumentation.log4j.appender.v2_17">
    <Appenders>
        <Console name="ConsoleAppender" target="SYSTEM_OUT" follow="true">
            <JsonLayout compact="true" eventEol="true">
                <KeyValuePair key="application" value="cdf-monitoring-utils"/>
                <KeyValuePair key="environment" value="development"/>
                <KeyValuePair key="version" value="1.0.0"/>
            </JsonLayout>
        </Console>
        <OpenTelemetry name="OpenTelemetryAppender" captureMapMessageAttributes="true" captureExperimentalAttributes="true">
            <JsonLayout compact="true" eventEol="true">
                <KeyValuePair key="application" value="cdf-monitoring-utils"/>
                <KeyValuePair key="environment" value="development"/>
                <KeyValuePair key="version" value="1.0.0"/>
            </JsonLayout>
        </OpenTelemetry>
    </Appenders>
    <Loggers>
        <Root level="info">
            <AppenderRef ref="OpenTelemetryAppender" />
            <AppenderRef ref="ConsoleAppender" />
        </Root>
    </Loggers>
</Configuration>

However, I noticed the OpenTelemetryAppender class does not say anything about JSON or the output format and it is only the message itself (so the content and not the other JSON child elements) that is being send. Could you help me to make sure the complete JSON body is being send?

Kind regards,

Tom