public com.google.devtools.cloudtrace.v2.Span.Link.Builder addLinkBuilder() {
        return getLinkFieldBuilder()
            .addBuilder(com.google.devtools.cloudtrace.v2.Span.Link.getDefaultInstance());
      }
<pre>
A collection of links.
</pre>

<code>repeated .google.devtools.cloudtrace.v2.Span.Link link = 1;</code>
java-trace/proto-google-cloud-trace-v2/src/main/java/com/google/devtools/cloudtrace/v2/Span.java