Build and use a local snapshot for benchmark tests

[jaydeluca]

Fixes #14701

Finding/downloading snapshots from sonatype has been unreliable, we've tried addressing intermittent network issues with retries (#14366), but now we are seeing 404s. @trask had suggested we could just assemble the snapshot ourself, so that's what I did here.

I tested this on my fork here

[laurit]

The main issue with the current approach is that it uses oss.sonatype.org. We don't publish snapshots there any more. If it used https://central.sonatype.com/repository/maven-snapshots/ it would probably work better. That being said assembling the jar is also fine.

[jaydeluca]

The main issue with the current approach is that it uses oss.sonatype.org. We don't publish snapshots there any more. If it used central.sonatype.com/repository/maven-snapshots it would probably work better. That being said assembling the jar is also fine.

@laurit ah yea, looks like we could grab it from https://central.sonatype.com/artifact/io.opentelemetry.javaagent/opentelemetry-javaagent which would probably save a lot of time on this gradle task. Do you happen to have a preference on whether we pull it or build it?

Edit: actually, still trying to find the actual snapshot

[laurit]

Edit: actually, still trying to find the actual snapshot

See https://central.sonatype.com/repository/maven-snapshots/io/opentelemetry/javaagent/opentelemetry-javaagent/2.21.0-SNAPSHOT/maven-metadata.xml Note the maven-snapshots in the url. Repository browsing is disabled so idk what the actual agent file name is.

Do you happen to have a preference on whether we pull it or build it?

not really

[jaydeluca]

See https://central.sonatype.com/repository/maven-snapshots/io/opentelemetry/javaagent/opentelemetry-javaagent/2.21.0-SNAPSHOT/maven-metadata.xml Note the maven-snapshots in the url. Repository browsing is disabled so idk what the actual agent file name is.

Yea I still haven't been able to figure out the actual path

[trask]

Yea I still haven't been able to figure out the actual path

https://central.sonatype.com/repository/maven-snapshots/io/opentelemetry/javaagent/opentelemetry-javaagent/2.21.0-SNAPSHOT/opentelemetry-javaagent-2.21.0-20250924.172006-52.jar

one possible advantage to using local build is that we could theoretically run the benchmark against PR branches, or against each merge to main... a little more flexible