Group.all_alerts missing?

is it me or the group.all_alerts is missing?
I use group.all_lights and various others which all work, but it seems group.all_alerts is not recognised (or at least not displayed when one alert is active.
I’ve added

group.all_alerts:
  hidden: false

to my customisation config

Just wondering whether I should submit a feature request? Anyone?

I do not think a group called all_alerts exists in the underlying code.