Yes, they weren't written "when Unix was young", but people had thought to write some of them over a decade before this toolset. lckdo and ts came long after setlock and cyclog (also the precursor to multilog) from the 1990s.

* https://cr.yp.to/daemontools/setlock.html

* http://cr.yp.to/daemontools/multilog.html

* http://cr.yp.to/daemontools/upgrade.html

* http://jdebp.uk./Softwares/nosh/guide/commands/cyclog.xml#CO...