YAML sections

NB: I’ve added this here as the knowledge has been removed from the official documentation.

For some integrations every entity needs its own entry in the configuration.yaml file. There are two styles for multiple entity entries, and these apply regardless of the domain (sensor, binary_sensor, switch, etc) - that my examples only use sensor doesn’t mean they only apply there.

Style 1: Collect every entity under the parent

This is the method I personally recommend:

sensor:
  - platform: command_line
    command: ping orbital.ceard.tech
  - platform: command_line
    command: /sbin/reboot

Style 2: List each entity separately

sensor ping:
  - platform: command_line
    command: ping orbital.ceard.tech

sensor reboot:
  - platform: command_line
    command: /sbin/reboot

Elsewhere

These rules also apply to things like MQTT sensors:

mqtt:
  sensor:
    - state_topic: "home/whale/temperature"
      name: "How cold is the whale"
    - state_topic: "home/petunia/temperature"
      name: "How hot is the petunia"

If you duplicate that sensor: line you’ll get errors when you run a configuration check.