gitlab ログ
jq コマンドの Linux への速攻インストール - Qiita
cat /var/log/gitlab/gitlab-rails/production_json.log | jq --raw-output --unbuffered 'select(.remote_ip != null and .method == "POST" and .path == "/users/sign_in") | .time + " " + .remote_ip + " " + .ua + " " + (.params[] | select(.key == "user").value.login )'