Only use raw monotonic time on Linux and macOS

tools/utils/clock_with_raw.go

@@ -0,0 +1,18 @@
+//go:build linux || darwin
+
+package utils
+
+import (
+	"time"
+
+	"golang.org/x/sys/unix"
+)
+
+func MonotonicRaw() (time.Time, error) {
+	ts := unix.Timespec{}
+	if err := unix.ClockGettime(unix.CLOCK_MONOTONIC_RAW, &ts); err != nil {
+		return time.Time{}, err
+	}
+	s, ns := ts.Unix()
+	return time.Unix(s, ns), nil
+}