there’s quite a few logs. Most say nothing at all or nothing useful.
running cat /var/log/samba/log.* the relevant parts (those datestamped at today) are probably these:
[2023/08/30 19:14:11.706304, 0] …/…/source3/smbd/server.c:1784(main) smbd version 4.13.13-Debian started. Copyright Andrew Tridgell and the Samba Team 1992-2020
[2023/08/30 19:14:12.011725, 0] …/…/lib/util/become_daemon.c:135(daemon_ready) daemon_ready: daemon ‘smbd’ finished starting up and ready to serve connections
[2023/08/30 19:20:39.232740, 0] …/…/source3/smbd/server.c:1784(main) smbd version 4.13.13-Debian started. Copyright Andrew Tridgell and the Samba Team 1992-2020
[2023/08/30 19:20:39.301393, 0] …/…/lib/util/become_daemon.c:135(daemon_ready) daemon_ready: daemon ‘smbd’ finished starting up and ready to serve connections
[2023/08/30 19:38:34.162744, 0] …/…/source3/smbd/server.c:1784(main) smbd version 4.13.13-Debian started. Copyright Andrew Tridgell and the Samba Team 1992-2020
[2023/08/30 19:38:34.231542, 0] …/…/lib/util/become_daemon.c:135(daemon_ready) daemon_ready: daemon ‘smbd’ finished starting up and ready to serve connections