title: GitLab: How to find the owner of an SSH key
body: <p>Given an SSH public key or fingerprint that has been registered with GitLab, how do I find out which account is associated with that key?</p>
  
  <p>Note that the key may have been registered as a "deploy key," in which case I'd like to know account that registered it.</p>
  
  <p>I'd prefer to know ways to do this using both the standard web UI (if possible), and programatically via the REST API. If neither of these are possible, I'll take answers that involve digging into the internals of GitLab (e.g., via a query on GitLab's database) if necessary.</p>