public Builder mergeMetadata(com.google.cloud.vertexai.api.ExplanationMetadataOverride value) {
      if (metadataBuilder_ == null) {
        if (((bitField0_ & 0x00000002) != 0)
            && metadata_ != null
            && metadata_
                != com.google.cloud.vertexai.api.ExplanationMetadataOverride.getDefaultInstance()) {
          getMetadataBuilder().mergeFrom(value);
        } else {
          metadata_ = value;
        }
      } else {
        metadataBuilder_.mergeFrom(value);
      }
      if (metadata_ != null) {
        bitField0_ |= 0x00000002;
        onChanged();
      }
      return this;
    }
<pre>
The metadata to be overridden. If not specified, no metadata is overridden.
</pre>

<code>.google.cloud.vertexai.v1.ExplanationMetadataOverride metadata = 2;</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/ExplanationSpecOverride.java