Transaction has wrong thread information sent to Sentry for OpenTelemetry spans

[adinauer]

Integration

sentry

Java Version

Version

8

Steps to Reproduce

Use our Spring Boot 3 OpenTelemetry sample with our sentry-opentelemetry-agent and cause a transaction, e.g. via HTTP GET /person/10

Expected Result

Actual thread where the transaction was started is sent to Sentry.

We should transfer the OpenTelemetry span attributes for thread info over.

Actual Result

A background thread (OpenTelemetry SpanProcessor thread) is sent to Sentry.

"trace": {
	"trace_id": "849956b3cb2ead7db1a5bbbf9db192d4",
	"span_id": "4d9370b69f588d90",
	"op": "ui.load",
	"status": "ok",
	"origin": "manual",
	"data": {
		"otel.instrumentation.name": "sentry-opentelemetry",
		"otel.kind": "INTERNAL",
		"otel.instrumentation.version": "8.7.0",
		"thread.name": "BatchSpanProcessor_WorkerThread-1",
		"thread.id": "16"
	}
}

Note that the span attributes record the correct thread information:

"attributes": {
	"thread.name": "AWT-EventQueue-0",
	"thread.id": 23
}