How to use a sensor's last known good value?

Configuration
9

Another option is something like this:

template:
  - trigger:
      - platform: state
        entity_id: sensor.some_sensor
    sensor:
      - name: "Some new sensor"
        icon: ...
        unit_of_measurement: ...
        device_class: ...
        state: "{{ trigger.to_state.state if trigger.to_state.state | has_value else trigger.from_state.state }}"
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