private com.google.protobuf.RepeatedFieldBuilderV3<
              com.google.devtools.cloudtrace.v2.Span.Link,
              com.google.devtools.cloudtrace.v2.Span.Link.Builder,
              com.google.devtools.cloudtrace.v2.Span.LinkOrBuilder>
          getLinkFieldBuilder() {
        if (linkBuilder_ == null) {
          linkBuilder_ =
              new com.google.protobuf.RepeatedFieldBuilderV3<
                  com.google.devtools.cloudtrace.v2.Span.Link,
                  com.google.devtools.cloudtrace.v2.Span.Link.Builder,
                  com.google.devtools.cloudtrace.v2.Span.LinkOrBuilder>(
                  link_, ((bitField0_ & 0x00000001) != 0), getParentForChildren(), isClean());
          link_ = null;
        }
        return linkBuilder_;
      }
<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