@java.lang.Override
  public com.google.protobuf.TimestampOrBuilder getExpireTimeOrBuilder() {
    if (expirationCase_ == 9) {
      return (com.google.protobuf.Timestamp) expiration_;
    }
    return com.google.protobuf.Timestamp.getDefaultInstance();
  }
<pre>
Timestamp of when this resource is considered expired.
This is *always* provided on output, regardless of what was sent
on input.
</pre>

<code>.google.protobuf.Timestamp expire_time = 9;</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/CachedContent.java