Merge branch 'pshutsin-master-patch-11489' into 'master'

Remove usage of ghost column

See merge request gitlab-org/gitlab-exporter!116

lib/gitlab_exporter/database/row_count.rb

@@ -110,7 +110,7 @@ module GitLab
                 GROUP BY members.user_id
               ) AS u
               ON users.id = u.user_id",
-            where: "ghost IS NULL AND user_type IS NULL",
+            where: "user_type IS NULL",
             fields: {
               admin:        {},
               external:     {},