Update May 2021:
Due to the release of CNAME Cloaking Defense with IOS and Safari 14 Munchkin cookies will be capped to a 7 day lifespan in Safari .
How does this impact Marketo?
How does Munchkin operate?
On a person’s first visit to a page on your domain, a new anonymous person record is created in Marketo. The primary key for this record is the Munchkin cookie (_mkto_trk) which is created in the user’s browser. All subsequent web activity on that browser is recorded against this anonymous record. In order to be associated with a known record in Marketo, one of the following methods should be used:
Once one of these actions is completed, the cookie and all its associated web activity will be associated with the known record.
How is Marketo planning to address ITP concerns?
Do I need to do anything to take advantage of these updates?
In order to leverage the new behavior and take advantage of the greater expiry period and tracking capabilities, ensure that you have configured the following:
What happens if I do nothing?
Munchkin’s ability to track users across sessions on the same domain will remain limited by ITP to either 1 or 7 days based on the browser and browser version used by the visitor. As of this posting, this only affects visitors using the Safari browser, although Chrome & Firefox may follow suit with their own versions.
When will the solution be launched?
These changes will begin as a staggered roll-out to customers who have opted into the Munchkin Beta channel in conjunction with the January 2020 Marketo release. Once the solution has been released to all beta customers, the roll-out to our entire customer base will begin in mid-to-late February. All customers should expect to have the solution by end of March 2020.
Google Chrome Update (Feb. 2020):
Google recently announced that the Chrome browser will block all third-party cookies within two years; however, since Marketo uses 1st party cookies, this update regarding 3rd party cookies will NOT affect your Marketo tracking efforts. For further context about 3rd party cookies in general, and the industry shift away from using them, please see the following article for Adobe's stance across the Experience Cloud Solutions: