"Do Not Track" is a browser request to not be tracked in systems like Marketo. You can honor that request with the following steps.
"Do Not Track" will be set to Ignore by default, so if that's what you want, you won't need to take any steps.
Under Person Tracking, click Edit.
Select Support and click Save.
After saving the changes, you will see the update.
Best practice is to support the "Do Not Track" feature. In Europe, it's the law!
To learn more about "Do Not Track" and how it works, please visit this page.