Fix references and existing tests

Signed-off-by: Shivanth <[email protected]>

Author: shivanthzen

prometheus/histogram.go

@@ -1844,37 +1844,41 @@ type constNativeHistogram struct {
 	nativeHistogramSchema           int32
 	nativeHistogramZeroThreshold    float64
 	nativeHistogramMaxZeroThreshold float64
-	createdTimestamp                       time.Time
+	createdTimestamp                time.Time
 	nativeExemplars                 []*dto.Exemplar
 
 	positiveBuckets map[int]int64
 	negativeBuckets map[int]int64
 	zeroBucket      uint64
 }
 
-func NewconstNativeHistogram(desc *Desc, count uint64, sum float64, postiveBuckets, negativeBuckets map[int]int64, zeroBucket uint64,
-	labelPairs []*dto.LabelPair, nativeHistogramSchema int32, nativeHistogramZeroThreshold float64,
-	nativeHistogramMaxZeroThreshold float64, nativeHistogramMaxBuckets uint32,
-	nativeHistogramMinResetDuration time.Duration,
+func NewConstNativeHistogram(desc *Desc, count uint64, sum float64, postiveBuckets, negativeBuckets map[int]int64, zeroBucket uint64,
+	nativeHistogramSchema int32, nativeHistogramZeroThreshold float64,
+	nativeHistogramMaxZeroThreshold float64,
 	createdTimestamp time.Time,
 	nativeExemplars []*dto.Exemplar,
-) (constNativeHistogram, error) {
-	return constNativeHistogram{
+	labelValues ...string,
+) (Metric, error) {
+	if desc.err != nil {
+		return nil, desc.err
+	}
+	if err := validateLabelValues(labelValues, len(desc.variableLabels.names)); err != nil {
+		return nil, err
+	}
+	return &constNativeHistogram{
 		desc:                            desc,
 		count:                           count,
 		sum:                             sum,
 		positiveBuckets:                 postiveBuckets,
 		negativeBuckets:                 negativeBuckets,
 		zeroBucket:                      zeroBucket,
-		labelPairs:                      labelPairs,
+		labelPairs:                      MakeLabelPairs(desc, labelValues),
 		nativeHistogramSchema:           nativeHistogramSchema,
 		nativeHistogramZeroThreshold:    nativeHistogramZeroThreshold,
 		nativeHistogramMaxZeroThreshold: nativeHistogramMaxZeroThreshold,
-		nativeHistogramMaxBuckets:       nativeHistogramMaxBuckets,
-		nativeHistogramMinResetDuration: nativeHistogramMinResetDuration,
-		timeStamp:                       timeStamp,
+		createdTimestamp:                createdTimestamp,
 		nativeExemplars:                 nativeExemplars,
-	}
+	}, nil
 }
 
 func (h *constNativeHistogram) Desc() *Desc {
@@ -1883,7 +1887,7 @@ func (h *constNativeHistogram) Desc() *Desc {
 
 func (h *constNativeHistogram) Write(out *dto.Metric) error {
 	his := &dto.Histogram{
-		CreatedTimestamp: timestamppb.New(h.timeStamp),
+		CreatedTimestamp: timestamppb.New(h.createdTimestamp),
 		Schema:           &h.nativeHistogramSchema,
 		ZeroThreshold:    &h.nativeHistogramZeroThreshold,
 		Exemplars:        h.nativeExemplars,

prometheus/histogram_test.go

@@ -1971,21 +1971,21 @@ func TestConstNativeHistogram(t *testing.T) {
 			n := atomic.LoadUint64(&_his.countAndHotIdx)
 			hotIdx := n >> 63
 			cold := _his.counts[hotIdx]
-			consthist := NewconstNativeHistogram(_his.Desc(),
+			consthist, err := NewConstNativeHistogram(_his.Desc(),
 				cold.count,
 				math.Float64frombits(cold.sumBits),
 				SyncMaptomap(&cold.nativeHistogramBucketsPositive),
 				SyncMaptomap(&cold.nativeHistogramBucketsNegative),
 				cold.nativeHistogramZeroBucket,
-				_his.labelPairs,
 				cold.nativeHistogramSchema,
 				math.Float64frombits(cold.nativeHistogramZeroThresholdBits),
 				_his.nativeHistogramMaxZeroThreshold,
-				_his.nativeHistogramMaxBuckets,
-				_his.nativeHistogramMinResetDuration,
 				_his.lastResetTime,
 				_his.nativeExemplars.exemplars,
 			)
+			if err != nil {
+				t.Fatal("unexpected error writing metric", err)
+			}
 			m2 := &dto.Metric{}
 
 			if err := consthist.Write(m2); err != nil {