opentelemetry.io/content/en/docs/zero-code/java/spring-boot-starter/additional-instrumentations.md

title	description	weight
Additional instrumentations	Additional instrumentations in addition to the out of the box instrumentation of the starter	50

The OpenTelemetry Spring Boot starter provides of the box instrumentation](../out-of-the-box-instrumentation) that you can complete with additional instrumentations.

Log4j2 Instrumentation

You have to add the OpenTelemetry appender to your log4j2.xml file:

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN" packages="io.opentelemetry.instrumentation.log4j.appender.v2_17">
    <Appenders>
        <OpenTelemetry name="OpenTelemetryAppender"/>
    </Appenders>
    <Loggers>
        <Root>
            <AppenderRef ref="OpenTelemetryAppender" level="All"/>
        </Root>
    </Loggers>
</Configuration>

You can find more configuration options for the OpenTelemetry appender in the Log4j instrumentation library.

System property	Type	Default	Description
otel.instrumentation.log4j-appender.enabled	Boolean	true	Enables the configuration of the Log4j OpenTelemetry appender with an OpenTelemetry instance.

OpenTelemetry instrumentations libraries

You can configure other instrumentations with OpenTelemetry instrumentations libraries.