/opt/librenms/poller.php 487 2018-11-29 14:06:16 - 1 devices polled in 3.873 secs
MariaDB [librenms]> select last_polled from devices where device_id = '487';
+---------------------+
| last_polled         |
+---------------------+
| 2018-11-29 14:00:01 |
+---------------------+
1 row in set (0.00 sec)