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additional-instrumentations.md

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Additional instrumentation
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The OpenTelemetry Spring Boot starter provides out of the box instrumentation that you can augment 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.

Instrumentation libraries

You can configure other instrumentations using OpenTelemetry instrumentation libraries.