Creates a new span to trace an operation.
The name of the span, describing the operation being traced.
OptionalparentSpan: RequestSpanOptional parent span for creating hierarchical traces.
OptionalstartTime: TimeInputOptional start time; defaults to current time if not provided.
A new RequestSpan instance.
Interface for creating and managing distributed tracing spans.
A RequestTracer is responsible for creating new spans to track operations.