So, I assumed if I have this turned on that my users would be able to login with either their usernames or email addresses, but this does not seem to be the case. In my configuration, uid is set to the sAMAccountName attribute, which is something like first 6 letters of your last name followed by first and middle initial. I am not sure what Gitlab uses for the email, but I assume it is the mail attribute which is something like firstname.lastname@example.org for us. I do not have the "attributes" section in my configuration file (mentioned here: https://docs.gitlab.com/ce/administration/auth/ldap.html) as I have never needed it. Now, my users can login with their usernames without a problem, but logging in with their email address does not work at all. Is this a bug, issue with my configuration, or by design?
gitlab_rails['ldap_enabled'] = true
gitlab_rails['ldap_servers'] = YAML.load <<-'EOS' # remember to close this block with 'EOS' below
main: # 'main' is the GitLab 'provider ID' of this LDAP server
method: 'plain' # "tls" or "ssl" or "plain"
## EE only