Reseller account receives the email:
From: Provider Co. [mailto:<email>]
To: <customer name>
Subject: Notification: Resource limits exceeded by reseller account.
The <account name> account is approaching or already exceeded the limits:
However, no exceeded or close to exceeded resources were found.
Software issue #PPPM-869
The issue will be fixed in further updates of Plesk.
Subscribe to our knowledge base - each product update comes with corresponding KB article .