koha plack-error.log shows these errors
Process Backgrounded
2023/11/18-10:47:48 Starman::Server (type Net::Server::PreFork) starting! pid(1506)
Binding to UNIX socket file "/var/run/koha/library/plack.sock"
Setting gid to "1001 1001"
Setting uid to "1001"
2023/11/18-15:10:02 Received QUIT. Running a graceful shutdown
Sending children hup signal
2023/11/18-15:10:02 Worker processes cleaned up
2023/11/18-15:10:02 Server closing!
Process Backgrounded
2023/11/20-08:47:27 Starman::Server (type Net::Server::PreFork) starting! pid(1431)
Binding to UNIX socket file "/var/run/koha/library/plack.sock"
Setting gid to "1001 1001"
Setting uid to "1001"
2023/11/20-13:01:07 Received QUIT. Running a graceful shutdown
Sending children hup signal
Process Backgrounded
2023/11/20-13:03:17 Starman::Server (type Net::Server::PreFork) starting! pid(1423)
Binding to UNIX socket file "/var/run/koha/library/plack.sock"
Setting gid to "1001 1001"
Setting uid to "1001"
2023/11/20-13:10:55 Received QUIT. Running a graceful shutdown
Sending children hup signal
Process Backgrounded
2023/11/20-13:13:05 Starman::Server (type Net::Server::PreFork) starting! pid(1279)
Binding to UNIX socket file "/var/run/koha/library/plack.sock"
Setting gid to "1001 1001"
Setting uid to "1001"