public Builder setUsageMetadata(
        com.google.cloud.vertexai.api.CachedContent.UsageMetadata.Builder builderForValue) {
      if (usageMetadataBuilder_ == null) {
        usageMetadata_ = builderForValue.build();
      } else {
        usageMetadataBuilder_.setMessage(builderForValue.build());
      }
      bitField0_ |= 0x00000800;
      onChanged();
      return this;
    }
<pre>
Output only. Metadata on the usage of the cached content.
</pre>

<code>
.google.cloud.vertexai.v1.CachedContent.UsageMetadata usage_metadata = 12 [(.google.api.field_behavior) = OUTPUT_ONLY];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/CachedContent.java