There's a merged pull request on the void-packages repository

ulogd: move logs to subdir, update logrotate file, add conf_files
https://github.com/void-linux/void-packages/pull/33847

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The logrotate file is configured to rotate `/var/log/ulog.log` and `/var/log/ulog.pcap`, but the default `/etc/ulogd.conf` is configured for `/var/log/ulogd.log` and `/var/log/ulogd.pcap` so nothing will get rotated.