Report virtual memory stats. This implementation mimics procps-ng-3.3.12, aka "free" CLI tool: https://gitlab.com/procps-ng/procps/blob/ 24fd2605c51fccc375ab0287cec33aa767f06718/proc/sysinfo.c#L778-791 The returned values are supposed to match both "free" and "vmstat -s" CLI
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