Calling `makemigrations` can call either `InteractiveMigrationQuestioner` or `NonInteractiveMigrationQuestioner`. When we send the flag `--no-input` to the `makemigrations` command it calls the non-interactive questioner.

```
if self.interactive:
    questioner = InteractiveMigrationQuestioner(specified_apps=app_labels, dry_run=self.dry_run)
else:
    questioner = NonInteractiveMigrationQuestioner(specified_apps=app_labels, dry_run=self.dry_run)
```
https://github.com/django/django/blob/290d8471bba35980f3e228f9c171afc40f2550fa/django/core/management/commands/makemigrations.py#L135-L138

`NonInteractiveMigrationQuestioner` itself will return `sys.exit(3)` in two methods:
```
class NonInteractiveMigrationQuestioner(MigrationQuestioner):

    def ask_not_null_addition(self, field_name, model_name):
        # We can't ask the user, so act like the user aborted.
        sys.exit(3)

    def ask_not_null_alteration(self, field_name, model_name):
        # We can't ask the user, so set as not provided.
        return NOT_PROVIDED

    def ask_auto_now_add_addition(self, field_name, model_name):
        # We can't ask the user, so act like the user aborted.
        sys.exit(3)
```

https://github.com/django/django/blob/e90af8bad44341cf8ebd469dac57b61a95667c1d/django/db/migrations/questioner.py#L227-L239