Useful template examples relating to lights that I wish I had known earlier:

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They seem to show up for me…

Screen Shot 2022-10-19 at 2.49.59 PM
Screen Shot 2022-10-19 at 2.49.59 PM1066×265 41 KB

Config for always unavailable light:

light:
  - platform: template
    lights:
      always_unavailable:
        unique_id: always_unavailable_light
        friendly_name: Always unavailable
        value_template: "on"
        level_template: "100"
        turn_on:
          event: now_im_valid
        turn_off:
          event: now_im_valid
        availability_template: "false"

Made a light group in the UI and put that light in it. Both lights definitely exist (that’s why I used the not recommended syntax of states.<entity ID>, got no errors), both have state unavailable, the group’s entity ID still comes back from integration_entities.

EDIT: I also just noticed that my “always unavailable” light group does not have an attribute of entity_id:

Screen Shot 2022-10-19 at 2.56.02 PM
Screen Shot 2022-10-19 at 2.56.02 PM1023×177 25.7 KB

So it actually seems like the inverse might be true. integration_entities just works. Trying to find group entities by looking for the attribute entity_id requires extra work to handle edge cases, like when they are unavailable.