refactor: remove dead code

report/metrics.go

@@ -199,23 +199,6 @@ func (m Metric) Merge(other Metric) Metric {
 	}
 }
 
-// Div returns a new copy of the metric, with each value divided by n.
-func (m Metric) Div(n float64) Metric {
-	samplesOut := make([]Sample, len(m.Samples), len(m.Samples))
-
-	for i := range m.Samples {
-		samplesOut[i].Value = m.Samples[i].Value / n
-		samplesOut[i].Timestamp = m.Samples[i].Timestamp
-	}
-	return Metric{
-		Samples: samplesOut,
-		Max:     m.Max / n,
-		Min:     m.Min / n,
-		First:   m.First,
-		Last:    m.Last,
-	}
-}
-
 // LastSample obtains the last sample of the metric
 func (m Metric) LastSample() (Sample, bool) {
 	if m.Samples == nil {

report/metrics_test.go

@@ -122,21 +122,6 @@ func TestMetricMerge(t *testing.T) {
 	}
 }
 
-func TestMetricDiv(t *testing.T) {
-	t1 := time.Now()
-	t2 := time.Now().Add(1 * time.Minute)
-
-	want := report.MakeMetric([]report.Sample{{Timestamp: t1, Value: -2}, {Timestamp: t2, Value: 2}})
-	beforeDiv := report.MakeMetric([]report.Sample{{Timestamp: t1, Value: -2048}, {Timestamp: t2, Value: 2048}})
-	have := beforeDiv.Div(1024)
-	if !reflect.DeepEqual(want, have) {
-		t.Errorf("diff: %s", test.Diff(want, have))
-	}
-
-	// Check the original was unmodified
-	checkMetric(t, beforeDiv, t1, t2, -2048, 2048)
-}
-
 func TestMetricMarshalling(t *testing.T) {
 	t1 := time.Now().UTC()
 	t2 := time.Now().UTC().Add(1 * time.Minute)