feat(notification): add option to convert metric units in request body (#1156)

* feat(notification): add option to convert metric units in request body

* ignore gosec

* rename fields

pkg/utils/bytes.go

@@ -0,0 +1,40 @@
+package utils
+
+import (
+	"fmt"
+	"math"
+)
+
+// https://github.com/dustin/go-humanize/blob/master/bytes.go
+
+func logn(n, b float64) float64 {
+	return math.Log(n) / math.Log(b)
+}
+
+func countDigits(n int64) int {
+	digits := 0
+	for n != 0 {
+		n /= 10
+		digits += 1
+	}
+	return digits
+}
+
+func humanateBytes(s uint64, base float64, minDigits int, sizes []string) string {
+	if s < 10 {
+		return fmt.Sprintf("%d B", s)
+	}
+	e := math.Floor(logn(float64(s), base))
+	suffix := sizes[min(len(sizes)-1, int(e))] // #nosec G602
+	rounding := math.Pow10(minDigits - 1)
+	val := math.Floor(float64(s)/math.Pow(base, e)*rounding+0.5) / rounding
+	ff := "%%.%df %%s"
+	digits := max(minDigits-countDigits(int64(val)), 0)
+	f := fmt.Sprintf(ff, digits)
+	return fmt.Sprintf(f, val, suffix)
+}
+
+func Bytes(s uint64) string {
+	sizes := []string{"B", "kB", "MB", "GB", "TB", "PB", "EB"}
+	return humanateBytes(s, 1024, 2, sizes)
+}