gcr.io/paketo-buildpacks/opentelemetry: otel javaagent extension

[germatpreis]

Hello,

I am using the gcr.io/paketo-buildpacks/opentelemetry buildpack in my spring-boot application via the spring-boot-maven-plugin (see below) and would like to provide an extension to the java agent (which at the moment only attaches some baggage properties to all spans) or if this is not possible, package my extension together with the agent and have the buildpack pull then this artifact from somewhere. I'd like to think this could be a rather standard use case.

I have not yet done a deep dive into how buildpacks work in detail - so far I just have been using them for a couple of months without having to know (which is great and I think one of the premises of buildpacks).

Is there any way the gcr.io/paketo-buildpacks/opentelemetry can help with that, or could someone point me into the right direction how achieve this?

Any help here would be very much appreciated. Also if it just is: you have to read into how buildpacks work.

Current configuration in the pom.xml:

<plugin>
	<artifactId>spring-boot-maven-plugin</artifactId>
	<configuration>
		<image>
			<name>some-service:latest</name>
			<pullPolicy>IF_NOT_PRESENT</pullPolicy>
			<buildpacks>
				<buildpack>urn:cnb:builder:paketo-buildpacks/java</buildpack>
				<buildpack>gcr.io/paketo-buildpacks/opentelemetry</buildpack>
			</buildpacks>
			<env>
				<BP_OPENTELEMETRY_ENABLED>true</BP_OPENTELEMETRY_ENABLED>
				<BP_PLATFORM>linux/arm64/v8</BP_PLATFORM>
			</env>
		</image>
	</configuration>
	<executions>
		<execution>
			<goals>
				<goal>build-image-no-fork</goal>
			</goals>
		</execution>
	</executions>
	<groupId>org.springframework.boot</groupId>
</plugin>

[dmikusa]

So there's no support in the buildpack directly for extensions, but it's possible you may still be able to enable them. How would you enable this extension if you were not using buildpacks? What steps would you take?