Tracing::Span& ConnectionManagerImpl::ActiveStream::activeSpan() {
  if (active_span_) {
    return *active_span_;
  } else {
    return Tracing::NullSpan::instance();
  }
}
Tracing::Span& ConnectionManagerImpl::ActiveStream::activeSpan() {
  if (active_span_) {
    return *active_span_;
  } else {
    return Tracing::NullSpan::instance();
  }
}