public Builder clearUsageMetadata() {
      bitField0_ = (bitField0_ & ~0x00000020);
      usageMetadata_ = null;
      if (usageMetadataBuilder_ != null) {
        usageMetadataBuilder_.dispose();
        usageMetadataBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
Usage metadata about the response(s).
</pre>

<code>.google.cloud.vertexai.v1.GenerateContentResponse.UsageMetadata usage_metadata = 4;
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/GenerateContentResponse.java