public Builder setServerMetadata(
        com.google.cloud.visionai.v1.ServerMetadata.Builder builderForValue) {
      if (serverMetadataBuilder_ == null) {
        serverMetadata_ = builderForValue.build();
      } else {
        serverMetadataBuilder_.setMessage(builderForValue.build());
      }
      bitField0_ |= 0x00000008;
      onChanged();
      return this;
    }
<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>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/PacketHeader.java