Use multiple sensors in one automation to avoid duplication

@alasdair wrote:

I’m using the whois platform to get the expiration dates of my domains

- platform: whois
  domain: domain1.com
  name: domain1_sensor
- platform: whois
  domain: domain2.com
  name: domain1_sensor

For each domain, I have an automation to send a notification when there are fewer than 31 days to expiry.

- alias: domain1_sensor_notify
  trigger:
    platform: time
    at: "10:00"
  condition:
    condition: numeric_state
    entity_id: sensor.domain1
    below: 31
  action:
    service: notify.email
    data_template:
      title: "domain1.com expiring"
      message: "Remaining days {{states.sensor.domain1_sensor.state}}"

- alias: domain2_sensor_notify
  trigger:
    platform: time
    at: "10:00"
  condition:
    condition: numeric_state
    entity_id: sensor.domain2
    below: 31
  action:
    service: notify.email
    data_template:
      title: "domain2.com expiring"
      message: "Remaining days {{states.sensor.domain1_sensor.state}}"

I’d like to have a single automation that works for all whois sensors. I’m new to writing automations, so could anyone suggest how to do this?

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