@java.lang.Override
    public int hashCode() {
      if (memoizedHashCode != 0) {
        return memoizedHashCode;
      }
      int hash = 41;
      hash = (19 * hash) + getDescriptor().hashCode();
      if (!internalGetAttributeMap().getMap().isEmpty()) {
        hash = (37 * hash) + ATTRIBUTE_MAP_FIELD_NUMBER;
        hash = (53 * hash) + internalGetAttributeMap().hashCode();
      }
      hash = (37 * hash) + DROPPED_ATTRIBUTES_COUNT_FIELD_NUMBER;
      hash = (53 * hash) + getDroppedAttributesCount();
      hash = (29 * hash) + getUnknownFields().hashCode();
      memoizedHashCode = hash;
      return hash;
    }
<pre>
The number of attributes that were discarded. Attributes can be discarded
because their keys are too long or because there are too many attributes.
If this value is 0 then all attributes are valid.
</pre>

<code>int32 dropped_attributes_count = 2;</code>

@return The droppedAttributesCount.
java-trace/proto-google-cloud-trace-v2/src/main/java/com/google/devtools/cloudtrace/v2/Span.java