@java.lang.Override
      public final Builder setUnknownFields(
          final com.google.protobuf.UnknownFieldSet unknownFields) {
        return super.setUnknownFields(unknownFields);
      }
<pre>
The cache lifetime for the returned match. Clients must not cache this
response past this timestamp to avoid false positives.
</pre>

<code>.google.protobuf.Timestamp expire_time = 3;</code>
java-webrisk/proto-google-cloud-webrisk-v1beta1/src/main/java/com/google/webrisk/v1beta1/SearchHashesResponse.java