public static Builder newBuilder() {
    return DEFAULT_INSTANCE.toBuilder();
  }
<pre>
The timestamp at which the stream server receives this packet. This is
based on the local clock of on the server side. It is guaranteed to be
monotonically increasing for the packets within each session; however
this timestamp is not comparable across packets sent to the same stream
different sessions. Session here refers to one individual gRPC streaming
request to the stream server.
</pre>

<code>.google.protobuf.Timestamp ingest_time = 2;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/ServerMetadata.java