On September 7th 2021, version 161 of Munchkin will begin rolling out to 10% of subscriptions with Munchkin Beta enabled, followed by 50% on September 16th, and 100% on September 30th. This change will affect Marketo landing pages and the version of the file munchkin-beta.js served to external landing pages which are loaded from subscriptions that the new version has been rolled out to. This version fully deprecates the Munchkin Associate Lead method, which is a feature that allowed submission of person data to a Marketo subscription and associated web browsing history with a known person record. Associate Lead is being removed in favor of more modern and secure alternatives, like the Forms JS API, the Form Submit API and the Associate Lead REST API. If you or your organization uses this method, you should migrate away from usage by October 12th 2021 when the October release rollout is scheduled to begin. You can find more info about this deprecation here.
Below is the rollout schedule as of 8/24/21