private com.google.protobuf.SingleFieldBuilderV3<
            com.google.devtools.cloudtrace.v2.Span.Links,
            com.google.devtools.cloudtrace.v2.Span.Links.Builder,
            com.google.devtools.cloudtrace.v2.Span.LinksOrBuilder>
        getLinksFieldBuilder() {
      if (linksBuilder_ == null) {
        linksBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.devtools.cloudtrace.v2.Span.Links,
                com.google.devtools.cloudtrace.v2.Span.Links.Builder,
                com.google.devtools.cloudtrace.v2.Span.LinksOrBuilder>(
                getLinks(), getParentForChildren(), isClean());
        links_ = null;
      }
      return linksBuilder_;
    }
<pre>
Links associated with the span. You can have up to 128 links per Span.
</pre>

<code>.google.devtools.cloudtrace.v2.Span.Links links = 10;</code>
java-trace/proto-google-cloud-trace-v2/src/main/java/com/google/devtools/cloudtrace/v2/Span.java