public Builder clearAttributes() {
      bitField0_ = (bitField0_ & ~0x00000040);
      attributes_ = null;
      if (attributesBuilder_ != null) {
        attributesBuilder_.dispose();
        attributesBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
A set of attributes on the span. You can have up to 32 attributes per
span.
</pre>

<code>.google.devtools.cloudtrace.v2.Span.Attributes attributes = 7;</code>
java-trace/proto-google-cloud-trace-v2/src/main/java/com/google/devtools/cloudtrace/v2/Span.java