Hot off the coattails of Google now sending notifications of Google My Business listing suspensions, Google is sending other notices as well. Here is a notice from Google that says your profile has been marked as a duplicate.
This screen shot comes from Kerry in the Local Search Forums. Kerry said "we received an email about a client's listing marked as a duplicate. Obviously the listing being marked as a duplicate is not the point here -- the email notification is."
These notifications via email are super useful and I am glad Google is now sending them for all sorts of Google My Business listing issues.
Forum discussion at Local Search Forums.