Rename Scale to Mul

Signed-off-by: Jeanette Tan <jeanette.tan@grafana.com>

model/histogram/float_histogram.go

@@ -159,12 +159,12 @@ func (h *FloatHistogram) ZeroBucket() Bucket[float64] {
 	}
 }
 
-// Scale scales the FloatHistogram by the provided factor, i.e. it scales all
+// Mul multiplies the FloatHistogram by the provided factor, i.e. it scales all
 // bucket counts including the zero bucket and the count and the sum of
 // observations. The bucket layout stays the same. This method changes the
 // receiving histogram directly (rather than acting on a copy). It returns a
 // pointer to the receiving histogram for convenience.
-func (h *FloatHistogram) Scale(factor float64) *FloatHistogram {
+func (h *FloatHistogram) Mul(factor float64) *FloatHistogram {
 	h.ZeroCount *= factor
 	h.Count *= factor
 	h.Sum *= factor

model/histogram/float_histogram_test.go

@@ -21,7 +21,7 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
-func TestFloatHistogramScale(t *testing.T) {
+func TestFloatHistogramMul(t *testing.T) {
 	cases := []struct {
 		name     string
 		in       *FloatHistogram
@@ -134,7 +134,7 @@ func TestFloatHistogramScale(t *testing.T) {
 
 	for _, c := range cases {
 		t.Run(c.name, func(t *testing.T) {
-			require.Equal(t, c.expected, c.in.Scale(c.scale))
+			require.Equal(t, c.expected, c.in.Mul(c.scale))
 			// Has it also happened in-place?
 			require.Equal(t, c.expected, c.in)
 		})

promql/engine.go

@@ -2427,15 +2427,15 @@ func vectorElemBinop(op parser.ItemType, lhs, rhs float64, hlhs, hrhs *histogram
 			if hrhs.Schema >= hlhs.Schema {
 				return 0, hlhs.Copy().Sub(hrhs).Compact(0), true
 			}
-			return 0, hrhs.Copy().Scale(-1).Add(hlhs).Compact(0), true
+			return 0, hrhs.Copy().Mul(-1).Add(hlhs).Compact(0), true
 		}
 		return lhs - rhs, nil, true
 	case parser.MUL:
 		if hlhs != nil && hrhs == nil {
-			return 0, hlhs.Copy().Scale(rhs), true
+			return 0, hlhs.Copy().Mul(rhs), true
 		}
 		if hlhs == nil && hrhs != nil {
-			return 0, hrhs.Copy().Scale(lhs), true
+			return 0, hrhs.Copy().Mul(lhs), true
 		}
 		return lhs * rhs, nil, true
 	case parser.DIV:
@@ -2635,7 +2635,7 @@ func (ev *evaluator) aggregation(op parser.ItemType, grouping []string, without
 					// The histogram being added/subtracted must have
 					// an equal or larger schema.
 					if s.H.Schema >= group.histogramMean.Schema {
-						toAdd := right.Scale(-1).Add(left)
+						toAdd := right.Mul(-1).Add(left)
 						group.histogramMean.Add(toAdd)
 					} else {
 						toAdd := left.Sub(right)

promql/functions.go

@@ -162,7 +162,7 @@ func extrapolatedRate(vals []parser.Value, args parser.Expressions, enh *EvalNod
 	if resultHistogram == nil {
 		resultFloat *= factor
 	} else {
-		resultHistogram.Scale(factor)
+		resultHistogram.Mul(factor)
 	}
 
 	return append(enh.Out, Sample{F: resultFloat, H: resultHistogram})
@@ -467,7 +467,7 @@ func funcAvgOverTime(vals []parser.Value, args parser.Expressions, enh *EvalNode
 				// The histogram being added/subtracted must have
 				// an equal or larger schema.
 				if h.H.Schema >= mean.Schema {
-					toAdd := right.Scale(-1).Add(left)
+					toAdd := right.Mul(-1).Add(left)
 					mean.Add(toAdd)
 				} else {
 					toAdd := left.Sub(right)