src/client/pkg/tracing/tracing.go
func StreamServerInterceptor() grpc.StreamServerInterceptor {
	return otgrpc.OpenTracingStreamServerInterceptor(opentracing.GlobalTracer(),
		otgrpc.IncludingSpans(addTraceIfTracingEnabled))
}
func StreamServerInterceptor() grpc.StreamServerInterceptor {
	return otgrpc.OpenTracingStreamServerInterceptor(opentracing.GlobalTracer(),
		otgrpc.IncludingSpans(addTraceIfTracingEnabled))
}
// StreamServerInterceptor returns a GRPC interceptor for non-streaming GRPC RPCs