Handling hundreds/thousands of automations

[knotty sequoia]

I have over 100 wired motion sensors directly connected to an Elk M1 alarm panel.

I have over 100 Zooz z-wave switches for automating lights.

I have 17 in-ceiling voice assistants with mmWave sensors.

I was hoping that I could use label or area generically and build a single motion activated light automation but it doesn’t appear that automations support labels/areas (sample code)
‘
alias: Motion → Lights ON (ELK + Timers)
description: ""
triggers:

• event_type: state_changed
  trigger: event
  conditions:
• condition: template
  value_template: >
  {% set e = trigger.event.data.entity_id %} {% set n =
  trigger.event.data.new_state %} {{
  e is not none
  and e.startswith('sensor.elkm1_zone_')
  and n is not none
  and n.state == 'violated'
  }}
  actions:
• target:
  entity_id: "{{ timers }}"
  action: timer.cancel
• target:
  entity_id: |
  {{ lights | select('is_state', 'off') | list }}
  action: light.turn_on
  mode: parallel
  variables:
  room_labels: "{{ trigger.event.data.entity_id | labels }}"
  lights: |
  {{ label_entities(room_labels)
  | select('search', '^light.')
  | list }}
  timers: |
  {{ label_entities(room_labels)
  | select('search', '^timer.')
  | list }}
  ‘

[cedar garnet]

I'm not at my computer now so can't easily give you an example of this but it's doable with a template trigger and an input number helper.
Trigger is something like: {{ label_entities(label) | select('is_state', 'on') | list | count != states(input number) | int}}
You then save the new number of "on" entities into the input number as part of the automation actions

You can access which entity actually caused the change with trigger entity and to_state

If you want to make explicit turn on and turn off automations rather than one that handles both use <> rather than !=

You'll obviously have to add some filtering on the room_labels - just start every controllable zone with some specific text or something (also makes it easier to sort your labels when you have a bunch)