@java.lang.Override
      public int hashCode() {
        if (memoizedHashCode != 0) {
          return memoizedHashCode;
        }
        int hash = 41;
        hash = (19 * hash) + getDescriptor().hashCode();
        if (hasDescription()) {
          hash = (37 * hash) + DESCRIPTION_FIELD_NUMBER;
          hash = (53 * hash) + getDescription().hashCode();
        }
        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 annotation. You can have up to 4 attributes
per Annotation.
</pre>

<code>.google.devtools.cloudtrace.v2.Span.Attributes attributes = 2;</code>
java-trace/proto-google-cloud-trace-v2/src/main/java/com/google/devtools/cloudtrace/v2/Span.java