It would be great to have an option to implement at the entity_id level an option that would trigger various notifications in case last-update is more than a specified time. I’m aware that this could be implemented using automations, however I think it’s really important to be aware when some sensors stop sending data and it is a kind of core feature.
EDIT : sorry it is somehow a cross post with this one. Fell free to delete mine and merge it with the other one