A simple web tool to monitor incoming OpenGameData events on a database server.
The monitor app is set up to run as a service.
On Apache servers, the most straightforward way to review debug logs is with the journalctl utility to review logs for a specific service.
Further, to avoid overwhelming amounts of old data, you should use the switch --since to narrow the output to recent logs.
Suppose your instance of the opengamedata-monitor service is named opengamedata-monitor.service.
Then the recommended command to review debug outputs would be e.g.
journalctl -u opengamedata-monitor.service --since "1 hour ago"