Improve Data Collection With Four Custom Dimensions
Add four crucial custom dimensions to all your Google Analytics hits with Google Tag Manager. The dimensions include hit timestamp, session ID, client ID and user ID.
6 Apr 2015 ... The dimensions include hit timestamp, session ID, client ID and user ID. ... getAll (); var i, len; for (i = 0, len = trackers.length; i < len; i += 1) { if ... session will take those values from the pageview instead of the Facebook referral.