@java.lang.Override
  public com.google.cloud.visionai.v1.ServerMetadata getServerMetadata() {
    return serverMetadata_ == null
        ? com.google.cloud.visionai.v1.ServerMetadata.getDefaultInstance()
        : serverMetadata_;
  }
<pre>
Output only. Metadata that the server appends to each packet before sending
it to receivers. You don't need to set a value for this field when sending
packets.
</pre>

<code>
.google.cloud.visionai.v1.ServerMetadata server_metadata = 4 [(.google.api.field_behavior) = OUTPUT_ONLY];
</code>

@return The serverMetadata.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/PacketHeader.java