ListOfSpans
class ListOfSpans(spans: List<Span> = emptyList(), tags: List<KeyValue> = emptyList(), unknownFields: ByteString = ByteString.EMPTY) : Message<ListOfSpans, Nothing>
List of spans is a message to send multiple spans in a single call. Any tags specified in this call will be added to all the spans sent in this message. If the list of spans is empty, this message will be ignored even if tags field is set.