private com.google.protobuf.MapField<java.lang.String, java.lang.String> internalGetMetadata() {
    if (metadata_ == null) {
      return com.google.protobuf.MapField.emptyMapField(MetadataDefaultEntryHolder.defaultEntry);
    }
    return metadata_;
  }
<pre>
The VM Boot Option, as set in the source vm.
</pre>

<code>.google.cloud.vmmigration.v1.ComputeEngineBootOption boot_option = 15;</code>

@return The bootOption.
java-vmmigration/proto-google-cloud-vmmigration-v1/src/main/java/com/google/cloud/vmmigration/v1/ComputeEngineTargetDetails.java