Alert when sensors stop updating

Configuration
31

I’m not really sure what the point of all this complexity is.

You can do just this:

trigger:
  - platform: state
    entity_id: sensor.living_room_temperature_1
    for: '00:10:00'
  - platform: state
    entity_id: sensor.outside_temperature
    for: '00:10:00'
  - platform: state
    entity_id: sensor.bedroom_temperature
    for: '00:10:00'
  - platform: state
    entity_id: sensor.kitchen_temperature
    for: '00:10:00'
action:
 - service: notify.telegram
   data_template:
     message: "{{ trigger.from_state.attributes.friendly_name }} has not updated since 10 min"
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