Additional instrumentation

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.

• Properties
• Declarative Configuration

otel:
  instrumentation:
    log4j-appender:
      enabled: true # default: true

otel:
  distribution:
    spring_starter:
      instrumentation:
        disabled:
          - log4j_appender

Instrumentation libraries

You can configure other instrumentations using OpenTelemetry instrumentation libraries.