The one that people came up with in the 1990s. There are quite a number of implementations to choose from. The shame of this hitting ASUS in 2023 is that this is a long-known problem and a long-since solved one. I have vague memories of grumpy posts on Usenet about this. It's that old a problem; and it has been solved for nigh on a quarter of a century.
Awesome, thanks! I am in fact guilty of using logrotate but thankfully I haven't been burned yet. Although perhaps with the advent of containers piping logs to streams I've unknowingly absolved myself.
Also, you have an amazing website. Looking forward to reading more.
See https://jdebp.uk/FGA/do-not-use-logrotate.html for everything from Bryan Cantrill to comments in GNU source code. (-: