Provide more control over the OTel SpanProcessors

[mmeller-wikia]

SpringBootVersion: 3.0.6

I was hoping to configure MetricExporter in default SpanProcessor provided in OpenTelemetryAutoConfiguration
OpenTelemetry code: https://github.com/open-telemetry/opentelemetry-java/blob/0bad3c982ad05f54461e241f8a402536c6f9d4b9/sdk/trace/src/main/java/io/opentelemetry/sdk/trace/export/BatchSpanProcessor.java#L187-L219

Current workaround:
Create @Primary SpanProcessor bean and redeclare SdkTracerProvider (using custom SpanProcessor bean). One downside is that 2 SpanProcessor beans are created with dandling default one.

If possible I would like to have a simple way to overwrite SpanProcessor bean

In PR discussion: #35558

[mhalbritter]

Just to clarify: You mean MeterProvider instead of MetricExporter, right? The code you linked only deals with MeterProvider. And judging from your comments in the PR, it has to be MeterProvider.

[mhalbritter]

I implemented two changes:

• There's now a SpanProcessors bean, which collects all available SpanProcessor beans. If you want full control over the span processors, provide your own SpanProcessors bean.
• If a MeterProvider bean is found, it's automatically registered on the default SpanProcessor.

[mmeller-wikia]

That's all I need :) Thank you!

[mhalbritter]

Thanks for the feedback and glad that this solves your problem!