NetNewsWire of Yore had an Error Log window (on Mac) which could help you figure out what’s going on when a feed or account is acting weird — when it’s stopped updating, for instance.
NetNewsWire 7.0.2 brings that feature back, and we’ve already used it to help fix a syncing authentication bug (bug fix will be in 7.0.3).
Get your updates the usual way and enjoy the return of the Error Log!
For more details, plus screenshots, see How to Use the Error Log.