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classTracingProcessor(abc.ABC):"""Interface for processing spans."""@abc.abstractmethoddefon_trace_start(self,trace:"Trace")->None:"""Called when a trace is started.        Args:            trace: The trace that started.        """pass@abc.abstractmethoddefon_trace_end(self,trace:"Trace")->None:"""Called when a trace is finished.        Args:            trace: The trace that finished.        """pass@abc.abstractmethoddefon_span_start(self,span:"Span[Any]")->None:"""Called when a span is started.        Args:            span: The span that started.        """pass@abc.abstractmethoddefon_span_end(self,span:"Span[Any]")->None:"""Called when a span is finished. Should not block or raise exceptions.        Args:            span: The span that finished.        """pass@abc.abstractmethoddefshutdown(self)->None:"""Called when the application stops."""pass@abc.abstractmethoddefforce_flush(self)->None:"""Forces an immediate flush of all queued spans/traces."""pass

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classTracingExporter(abc.ABC):"""Exports traces and spans. For example, could log them or send them to a backend."""@abc.abstractmethoddefexport(self,items:list["Trace | Span[Any]"])->None:"""Exports a list of traces and spans.        Args:            items: The items to export.        """pass