Meaning of utag_main Cookie Parameters

[loldenburg]

In https://community.tealiumiq.com/t5/iQ-Tag-Management/Tealium-Cookies/ta-p/138, some standard parameters are explained. However, we also see the following:

vapi_domain:

dc_visit / dc_event / dc_region: 

Can they be added to the doc?

[UnknownJ · Accepted solution]

For the benefit of anybody who finds this post and wants to know what the Tealium Collect cookies are for:

Cookie Name	Function
dc_group	Stores a random number between 1 and 100 for the user, which is then used to compare against the sample rate to determine if this user qualifies for data collection (e.g. if the sample rate is 80%, only users with a dc_group value between 1 and 80 will be in scope).
dc_region	Stores the region of the data collection server, returned in the response headers of the first XHR call and stored for the duration of that session, ensuring that all data for a given session is collected by the same server
dc_event	Auto-incrementing event ID within the current session, starts from one, persits for the life of that session
dc_visit	Auto-incrementing session ID stored persistently, starts from one, increments each time the dc_event value expires

[kathleen_jo]

Great answer @UnknownJ. Thank you so much for this!

[loldenburg]

Better than Kudos @kathleen_jo: Add it to the - as way too often - incomplete documentation (see my link in the first post): https://community.tealiumiq.com/t5/iQ-Tag-Management/Tealium-Cookies/ta-p/138