Without any news, Google turned on the ability to receive your Google Alerts as an RSS feed. This feature was killed along with the shut down of Google Reader – again without any news that it would happen.
Google shut off RSS delivery of Google Alerts today, with a simple message embedded in your Alerts feed. I guess without Google Reader, they felt no need to keep the RSS version of alerts.
You can transition all of your alerts to Talkwalker.com. The service looks exactly like Google Alerts. We have been testing it and it does deliver a lot of content. The content can be less targeted, but the training features of MyCurator can help with that.