Monitor UI and logs
See the user documentation available here
The logs are created in a different location than other Flow Production Tracking Logs and they will not be deleted by default, you can find them here:
$SHOTGRID_HOME/<site name>/<config folder>/tm-bg-publish/<engine name>
Within this folder you will find one or more temporary folder names and within each of those folders you will find three files:
bg_publish.log
monitor.yml
publish_tree.yml
These files can help you identify issues if there are any errors during the background publishing process.
You can use the Background Publish Monitor interface to clean up the folders and files or delete using your OS’ file browser capabilities.