gitlab-ce/app/validators/json_schemas/organization_settings.json

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "description": "Settings for Organizations",
  "type": "object",
  "additionalProperties": false,
  "properties": {
    "restricted_visibility_levels": {
      "type": "array",
      "items": {
        "type": "integer"
      }
    },
    "default_group_visibility": {
      "type": [
        "integer",
        "null"
      ]
    }
  }
}