If an edit gets marked as patrolled, or marked as reviewed via PageCuration with no specific issues flagged, this currently creates a Notification for the user who made the edit — typically a new user whose edits are not yet autopatrolled.
Since these actions do not include any actionable feedback (unlike the case where a page is tagged with specific issues), these Notifications are useless, confusing, and little bit intimidating. It's not useful for a user to know simply that "your edit was reviewed" (or, as on English Wikipedia via a modified MediaWiki message, "patrolled"), without knowing anything about what an edit having been review/patrolled means. Since new users find this so confusing, these messages should be disabled.
I created a patch which removes the creation of these types of Notifications (but leaves the Echo formatters in place so that previously issued ones will still appear): https://gerrit.wikimedia.org/r/#/c/175168/