‘People with Experience Cloud ID’ is a Cross-device analytics metric that shows the number of People who were identified by Adobe using the Experience Cloud ID service.
Considering each People (identified or unidentified), this metric increases if the hit contains the mid
query string (based on the s_ecid
cookie).
You can create the calculated metric [People with ECID] ÷ [People]
to obtain the percent of visitors to your site using the ID service.
See the equivalent non-CDA metric Visitors with Experience Cloud ID for more information around importance of Experience Cloud ID and debugging your setup.