@java.lang.Override
  public int hashCode() {
    if (memoizedHashCode != 0) {
      return memoizedHashCode;
    }
    int hash = 41;
    hash = (19 * hash) + getDescriptor().hashCode();
    hash = (37 * hash) + RESPONSE_TYPE_FIELD_NUMBER;
    hash = (53 * hash) + responseType_;
    if (hasAdditions()) {
      hash = (37 * hash) + ADDITIONS_FIELD_NUMBER;
      hash = (53 * hash) + getAdditions().hashCode();
    }
    if (hasRemovals()) {
      hash = (37 * hash) + REMOVALS_FIELD_NUMBER;
      hash = (53 * hash) + getRemovals().hashCode();
    }
    hash = (37 * hash) + NEW_VERSION_TOKEN_FIELD_NUMBER;
    hash = (53 * hash) + getNewVersionToken().hashCode();
    if (hasChecksum()) {
      hash = (37 * hash) + CHECKSUM_FIELD_NUMBER;
      hash = (53 * hash) + getChecksum().hashCode();
    }
    if (hasRecommendedNextDiff()) {
      hash = (37 * hash) + RECOMMENDED_NEXT_DIFF_FIELD_NUMBER;
      hash = (53 * hash) + getRecommendedNextDiff().hashCode();
    }
    hash = (29 * hash) + getUnknownFields().hashCode();
    memoizedHashCode = hash;
    return hash;
  }
<pre>
The soonest the client should wait before issuing any diff
request. Querying sooner is unlikely to produce a meaningful diff.
Waiting longer is acceptable considering the use case.
If this field is not set clients may update as soon as they want.
</pre>

<code>.google.protobuf.Timestamp recommended_next_diff = 2;</code>
java-webrisk/proto-google-cloud-webrisk-v1beta1/src/main/java/com/google/webrisk/v1beta1/ComputeThreatListDiffResponse.java