opentelemetry

type TracerOptions struct {
	// Tracer is the tracer to use. If not set, one is obtained from the global
	// tracer provider using the name "temporal-sdk-go".
	Tracer trace.Tracer

	// TextMapPropagator is the propagator to use for serializing spans. If not
	// set, this uses DefaultTextMapPropagator, not the OpenTelemetry global one.
	// To use the OpenTelemetry global one, set this value to the result of the
	// global call.
	TextMapPropagator propagation.TextMapPropagator

	// SpanContextKey is the context key used for internal span tracking (not to
	// be confused with the context key OpenTelemetry uses internally). If not
	// set, this defaults to an internal key (recommended).
	SpanContextKey interface{}

	// HeaderKey is the Temporal header field key used to serialize spans. If
	// empty, this defaults to the one used by all SDKs (recommended).
	HeaderKey string

	// SpanStarter is a callback to create spans. If not set, this creates normal
	// OpenTelemetry spans calling Tracer.Start.
	SpanStarter func(ctx context.Context, t trace.Tracer, spanName string, opts ...trace.SpanStartOption) trace.Span
}