public Builder clearAttributes() {
        bitField0_ = (bitField0_ & ~0x00000008);
        attributes_ = null;
        if (attributesBuilder_ != null) {
          attributesBuilder_.dispose();
          attributesBuilder_ = null;
        }
        onChanged();
        return this;
      }
<pre>
A set of attributes on the link. Up to 32 attributes can be
specified per link.
</pre>

<code>.google.devtools.cloudtrace.v2.Span.Attributes attributes = 4;</code>
java-trace/proto-google-cloud-trace-v2/src/main/java/com/google/devtools/cloudtrace/v2/Span.java