Getting "This Entity is no longer being provided by the Mqtt (ring) integration" - how can I fix please?

[robveck]

Greetings
Unfortunately, all the ring entities provided by MQTT have become unavailable. Key are the contact sensors which are used to trigger automations. I have reauthentication which worked but at a bit of a loss as to what to do next.
Suggestions would be very welcome.
Thanks in advance

[robveck]

It was fixed by reading the information from the author - Restart the broker, and then restart the MQTT Ring. All back in order, but will investigate how I can get quickly notified if the problem happens again, so I can restart (ideally automatically).

[GilwellBudgens]

I'm having the same issue, restarting the broker and Ring MQTT add on didn't work. I have also tried to restart HA a few times but everything still shows as 'unavailable'.