[Bug 280909] Please add the vm.swap_free sysctl variable

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280909

--- Comment #2 from Yuri Victorovich <yuri@freebsd.org> ---
(In reply to Gleb Popov from comment #1)

This type of approach would need to be separately implemented for many
languages, for example Golang, Rust, Haskel, Java, etc.

sysctl is more likely to be already available for all languages.

Additionally, it is logical to have vm.swap_free when vm.swap_total is already
present.

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