Yes, I saw (and still see) these. It's related to some new "analytics" setting. They are bothersome, but not extremely bothersome, so I haven't dug into it. I think that mine are occurring because I don't put "Course end dates" on my courses, so the analytics thinks that they are still active. This is my best guess right now.
Installing and upgrading help
Moodle Emails After Upgrade
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