public Builder mergeFrom(com.google.devtools.cloudtrace.v2.Span.Links other) {
        if (other == com.google.devtools.cloudtrace.v2.Span.Links.getDefaultInstance()) return this;
        if (linkBuilder_ == null) {
          if (!other.link_.isEmpty()) {
            if (link_.isEmpty()) {
              link_ = other.link_;
              bitField0_ = (bitField0_ & ~0x00000001);
            } else {
              ensureLinkIsMutable();
              link_.addAll(other.link_);
            }
            onChanged();
          }
        } else {
          if (!other.link_.isEmpty()) {
            if (linkBuilder_.isEmpty()) {
              linkBuilder_.dispose();
              linkBuilder_ = null;
              link_ = other.link_;
              bitField0_ = (bitField0_ & ~0x00000001);
              linkBuilder_ =
                  com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders
                      ? getLinkFieldBuilder()
                      : null;
            } else {
              linkBuilder_.addAllMessages(other.link_);
            }
          }
        }
        if (other.getDroppedLinksCount() != 0) {
          setDroppedLinksCount(other.getDroppedLinksCount());
        }
        this.mergeUnknownFields(other.getUnknownFields());
        onChanged();
        return this;
      }
<pre>
A collection of links, which are references from this span to a span
in the same or different trace.
</pre>

Protobuf type {@code google.devtools.cloudtrace.v2.Span.Links}
java-trace/proto-google-cloud-trace-v2/src/main/java/com/google/devtools/cloudtrace/v2/Span.java