The day light savings problem of last weekend was a good example that dependency on recorded data with the new Energy module has changed for a lot of users. Luckily my home assistant was still running but all history graphs showed flatlines and in the Energy module no events were recorded anymore for the timeslots after the recorder died. I also saw comments from users who only noticed this after a couple of hours or even days.
Therefore I suggest to provide a sensor that shows if the recorder is still healthy or not. This could then also be used as indicator on the HA dashboards and as a user I can use it to be automatically notified if there are some issues.
Of course I could already create something like that myself, but it will be useful for the whole HA community.