We’ve checked it out, and the logs include the application logs. You have to run journalctl -a on the log file, because of some quirks regarding how docker saves logs (without -a it just shows [10B blob data] or similar). Your application logs are under the header of docker. So if you get out the persistent log’s systemd journal, then run journalctl --file=system.journal -a on it, and should see your application’s messages too.
As for your last comment, just double-checking it…