@java.lang.Override
    public int hashCode() {
      if (memoizedHashCode != 0) {
        return memoizedHashCode;
      }
      int hash = 41;
      hash = (19 * hash) + getDescriptor().hashCode();
      hash = (37 * hash) + TRACE_ID_FIELD_NUMBER;
      hash = (53 * hash) + getTraceId().hashCode();
      hash = (37 * hash) + SPAN_ID_FIELD_NUMBER;
      hash = (53 * hash) + getSpanId().hashCode();
      hash = (37 * hash) + TYPE_FIELD_NUMBER;
      hash = (53 * hash) + type_;
      if (hasAttributes()) {
        hash = (37 * hash) + ATTRIBUTES_FIELD_NUMBER;
        hash = (53 * hash) + getAttributes().hashCode();
      }
      hash = (29 * hash) + getUnknownFields().hashCode();
      memoizedHashCode = hash;
      return hash;
    }
<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