POTEL 29 - Partially fix bootstrap class loading

[adinauer]

📜 Description

Partially fix bootstrap class loading by actually loading sentry-opentelemetry-bootstrap into the bootstrap classloader which wasn't the case before as it was loaded into the agent class loader by accident (implementation dependency in sentry-opentelemetry-agentcustomization which was supposed to be compileOnly).

We now added a sentry-opentelemetry-extra module which should ideally be loaded into bootstrap classloader but isn't for now since loading the classes into bootstrap classloader would cause ClassNotFoundException for OpenTelemetry classes like ReadWriteSpan which aren't available in bootstrap classloader.

Since we haven't found a way to fix the ClassNotFoundException so far, we're continuing to load the extra classes into the agent classloader.

💡 Motivation and Context

Without this Context manipulation is incorrect as there are multiple Sentry Scopes entries due to the key being loaded into separate class loaders and Context ending up with one entry per classloader used.

This also means access to Context returns a different scope depending on what classloader is used when retrieving via key.

💚 How did you test it?

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.

🔮 Next steps

[github-actions]

	Messages
📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

Generated by 🚫 dangerJS against b127605

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	404.70 ms	509.24 ms	104.54 ms
Size	1.70 MiB	2.29 MiB	599.77 KiB

Baseline results on branch: 8.x.x

Startup times

Revision	Plain	With Sentry	Diff
a59fca2	560.08 ms	658.80 ms	98.71 ms

App size

Revision	Plain	With Sentry	Diff
a59fca2	1.70 MiB	2.29 MiB	599.77 KiB

Previous results on branch: feat/potel-29-partially-fix-bootstrap-class-loading

Startup times

Revision	Plain	With Sentry	Diff
e954223	387.30 ms	499.46 ms	112.16 ms

App size

Revision	Plain	With Sentry	Diff
e954223	1.70 MiB	2.29 MiB	599.77 KiB

[stefanosiano]

lgtm!