This, plus Nielsen routinely monitors stations in PPM markets, and will notify the station if encoding stops for significant lengths of time.The newer PPM Monitor have built in Email notification and contact closure to hook up to a Burk or other monitoring device. It's up to the station to integrate on how it alerts if there is an encoding issue. They can also log into the newer units and see how well the audio for the station is encoded.
Nielsen does give a station that encodes an encoding monitor but it's up to the station set it up and to use it.
Where I work we have encoding monitor/workstations that are visually checked on a regular basis, and both have SNMP traps set up to alert the technical folks if encoding stops for longer than (I believe) :30.