public static Builder newBuilder() {
    return DEFAULT_INSTANCE.toBuilder();
  }
<pre>
Required. The ID to use for the CDN key, which will become the final
component of the CDN key's resource name.

This value should conform to RFC-1034, which restricts to
lower-case letters, numbers, and hyphen, with the first character a
letter, the last a letter or a number, and a 63 character maximum.
</pre>

<code>string cdn_key_id = 3 [(.google.api.field_behavior) = REQUIRED];</code>

@return The bytes for cdnKeyId.
java-video-stitcher/proto-google-cloud-video-stitcher-v1/src/main/java/com/google/cloud/video/stitcher/v1/CreateCdnKeyRequest.java