POTEL 25 - Workaround for sentry-opentelemetry-agent with SENTRY_AUTO_INIT=false

[adinauer]

#skip-changelog

📜 Description

Using SentrySpanFactoryHolder which is loaded into the bootstrap classloader and is used by the agent to assign a OtelSpanFactory instance created in the agent class loader which references SentryWeakSpanStorage also from the agent classloader. Without this workaround the application would be referring to SentryWeakSpanStorage (via OtelSpanFactory) in the bootstrap classloader which has no data in it (since the span processor writes to the one in the agent class loader).

💡 Motivation and Context

Due to a bug around using the wrong classloader for sentry-opentelemetry-bootstrap (currently loaded via agent classloader; should be bootstrap classloader), we need a workaround when the agent is used without auto init (SENTRY_AUTO_INIT=false).

💚 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]

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

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