developers.home-assistant/blog/2023-09-12-ws-entity-source-simplified.md

author	authorURL	title
Erik Montnémery	https://github.com/emontnemery	The websocket command entity/source has been modified

The websocket command entity/source has been greatly simplified:

• It's no longer possible to get information for a single entity
• Only the domain of the entities is included in the response, custom_component, config_entry and source are no longer present.

New response example

{
  "light.entity_1": {
    "domain": "template",
  },
  "switch.entity_2": {
    "domain": "shelly",
  },
}

Old response example

{
  "light.entity_1": {
    "custom_component": false,
    "domain": "template",
    "source": "platform_config",
  },
  "switch.entity_2": {
    "custom_component": false,
    "config_entry": "<config_entry_id>",
    "domain": "shelly",
    "source": "config_entry",
  },
}

The change was introduced in core PR#99439