Custom
If you have the need to extract configuration and changes from the scraped configuration itself, the full flag will enable you to do so. This is a very niche use case and might only make sense when the source returns arbitrary data; example: HTTP, SQL, git, etc...
Example
Consider that we have the following configuration file
full: true
file:
  - type: Car
    id: $.reg_no
    paths:
      - fixtures/data/car_changes.json
where fixtures/data/car_changes.json is
{
  "reg_no": "A123",
  "config": {
    "meta": "this is the actual config that'll be stored."
  },
  "changes": [
    {
      "action": "drive",
      "summary": "car color changed to blue",
      "unrelated_stuff": 123
    }
  ]
}
Since full=true, Config DB will extract the config and changes from the scraped JSON config. So, the actual config will simply be
{
  "meta": "this is the actual config that'll be stored."
}
and the following new config change would be registered for that particular config item
{
  "action": "drive",
  "summary": "car color changed to blue",
  "unrelated_stuff": 123
}
It is expected that config and changes are available with keys config and changes respectively.