Today (a few hours ago) I got an email from Adsense titled:
"Your AdSense Publisher Policy Violation Report for pub-xxxxxx on Jun 24, 2017"

In the email it clear states:

>>In the last 24 hours:
>>New violations were detected. As a result, ad serving has been restricted or disabled on pages where these violations of the AdSense Program Policies were found.

I've followed the link in the email to the reporting page in my Adsense account to see where the violations lie (the Policy Center page). Unfortunately (or fortunately), that page specifically states "Keep up the great work. You have no policy violations."

However, the email does also state:
>>Please note this report doesn’t cover violations that may happen on an overall site or account level. You may be notified by a separate email if site or account level violations are found. Ads will continue to serve where no policy violations have been found, either at the page or site level.

I haven't recieved any other emails from Adsense. Since it's the weekend, there's no one to contact. Anyone had a similar experience? Any chance that the notice was sent out in error (I was hoping there'd already be a thread about this)?

I've looked at my Adsense stats for today, I'm not sure I'm picking up on any abnormal values (like reduced impressions or income).