<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=403312) </details> <!--IssueSummary end--> 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](https://docs.gitlab.com/ee/api/users.html#list-ssh-keys-for-user) does not currently return `last_used_dt`.