New search console will soon start selecting search metrics to the google selected canonical URL, rather than the URL associated in a google search.
– At an individual URL level change, Traffic will shift from any non-canonical (duplicate) URLs to the canonical URL.
Example:
If both pages were indexed,
http://www.example.com/sample &
http://www.example.com/sample-test
http://www.example.com/sample is Google selected canonical, Data will be consolidated.
– At the property level; if you have a site with desktop version & mobile version, then data will be consolidated to the main URL (Example: Data will be combined for http://www.example.com & m.example.com)
– Most property-level data will shift to one property, AMP property traffic will fall to zero in most cases.