https://manpages.ubuntu.com/manpages/questing/man9/boottime.9freebsd.html
Ubuntu Manpage: boottime,
ubuntumanpage
https://rust.docs.kernel.org/kernel/time/struct.BootTime.html
BootTime in kernel::time - Rust
A monotonic that ticks while system is suspended.
kerneltimerust
https://wiki.freebsd.org/BootTime
BootTime - FreeBSD Wiki
freebsdwiki
https://manpages.ubuntu.com/manpages/stonking/man9/time_uptime.9freebsd.html
Ubuntu Manpage: boottime,
ubuntumanpage
https://lkml.iu.edu/1803.1/05966.html
Linux-Kernel Archive: Re: [RFC/RFT patch 0/7] timekeeping: Unify clock MONOTONIC and clock BOOTTIME