[inferred spans] Java 8 vs. agrona

[breedx-splk]

Component(s)

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Is your feature request related to a problem? Please describe.

This PR tries to update agorna to the latest version: #1433

It currently breaks the build, because agorna has chosen to require java 17:
https://github.com/real-logic/agrona/releases/tag/1.23.0-v2

So now the inferred-spans module cannot update agorna. We should figure out if we want to continue using it and/or require java 17 as well, or something else.

Describe the solution you'd like

Creating this issue mostly for the component owners to figure this out.

Describe alternatives you've considered

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Additional context

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[breedx-splk]

@jackshirazi @SylvainJuge @JonasKunz what do you think?

[SylvainJuge]

The usage in inferred spans is mostly for a few collection implementations, so we definitely not require the latest features. Doing an upgrade here means dropping support from Java 8 to 16 which is definitely a big change. We need to discuss this on our side but my gut feeling is that we will probably only keep the 1.22.0 version for now.

[JonasKunz]

Yeah let's just stick with 1.22.0.
In the elastic-apm-agent we still support Java 7. For that reason agrona wasn't used as a dependency, but the source code of the used collections was copied directly to the repo.

We only use agrona for some primitive-optimized collections (maps and lists). Those don't use any "nasty" features but just plain Java without any java-api calls and therefore are very very very unlikely pose a security risk. I also don't expect that we lose out on significant performance gains as the fundamental algorithms are decades old.

If we ever get a report of a security vulnerability we can move to copying / reimplementing the used primitive collections, but I highly doubt that we'll receive such a vulnerability report.

[jackshirazi]

closing this as we will not upgrade agrona, and if there is a vulnerability found in agrona, we will replace it