haproxy-certbot missing logs?

[Greg McNamara]

I have deployed Thingsboard PE using this docker-compose config. I'm trying to troubleshoot a transport error with MQTT and SSL, and I'd like to check the haproxy logs. I was expecting them at /var/log/haproxy.log (which points to a host volume) but can't find them. I also tried attaching to the container to view the live logs but there's no output. With this docker-compose configuration, are the haproxy logs generated and available? If not by default, would it be possible to adjust the configuration to output the logs to a volume outside the container? I can see the logs are published on 127.0.0.1 on the container, and should be picked up by syslog but not sure where they go from there.