<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def extra_metadata(self):
 """Get extra metadata for file in repository."""

        return get_extra_metadata(
            self.gh.api,
            self.repository['owner']['login'],
            self.repository['name'],
            self.release['tag_name'],
        )