(The content in the root post is edited for more details)

I see how that can be useful.

How about, we add a simple boolean to the template variables. Something like group_finished?
I'm against just using state.tasks.len() as users will probably be interested in which group just finished. This will give them more control on what should happen based on the finished group.

The group is already part of the variables that're available.

You could then do stuff like

if [[ "true" = "{{ group_finished }}" ]]; then
  if [[ "default" = "{{ group }}" ]]; then
    # Do your stuff
  fi
fi

we add a simple boolean to the template variables. Something like group_finished

Thanks, that looks pretty reasonable!

One more question.

When should a queue be considered finished?
I feel at least when there're no more queued, running or paused entries. But what about stashed entries with a delay? I guess a group shouldn't be considered "finished" if there's still a task that'll be queued sometime in the future.

stashed entries without a delay oh the other hand should probably be ignored?

Hmm, then maybe provide fine-grained details, such as {{ num_queued }}, {{ num_stashed }}, etc?