/etc/sv/socklog-unix/log/run is in socklog-run 2.1.0-8.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 | #!/bin/sh
exec chpst -ulog svlogd \
main/main main/auth main/cron main/daemon main/debug main/ftp \
main/kern main/local main/mail main/news main/syslog main/user
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