With the death of Google Reader, Google has euthanised its Google Alerts RSS feed support.
Google Alerts is a service that scours the internet for content relevant to what users specify. Notifications on new content that match chosen keywords could previously be received through emails or through an RSS feed. The latter option has now been dropped.
The ability to funnel notifications to RSS feeds has died, along with support for Google's RSS Reader. Any alert RSS feed now contains the following message:
Google Alerts RSS users can still receive notifications, but only via email.
Google competitor Yahoo also shut down its RSS Alerts services earlier this month.