User Keys API doesn't return last used date for ssh key

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In the GitLab GUI I can see the last used date for a user's ssh keys. The API (/api/v4/users/{user_id}/keys/{key_id}), however, doesn't return these properties:

{'id': 1, 'title': 'key_name', 'created_at': '2016-04-07T13:20:01.807Z', 'expires_at': None, 'key': 'ssh-rsa...', 'usage_type': 'auth_and_signing'}

For auditing purposes I must be able to tell when an ssh key has been last used, so that I can flag (and possibly remove) "unused" keys.

Context

The user keys endpoint does not currently return last_used_dt.