Remove exemplars from parameters for constNativeHistogram function

Signed-off-by: Shivanth <shivanth.metchem@deliveryhero.com>

Author: shivanthzen

prometheus/histogram.go

@@ -1867,15 +1867,6 @@ func validateCount(sum float64, count uint64, negativeBuckets, positiveBuckets m
 	return nil
 }
 
-func validateExemplars(exemplars []*dto.Exemplar) error {
-	for _, e := range exemplars {
-		if !e.GetTimestamp().IsValid() {
-			return fmt.Errorf("invalid timestamp found in exemplars")
-		}
-	}
-	return nil
-}
-
 // NewConstNativeHistogram returns a metric representing a Prometheus Nativehistogram with
 // fixed values for the count, sum, and positive/negative/zero bucket counts. As those parameters
 // cannot be changed, the returned value does not implement the Histogram
@@ -1905,7 +1896,6 @@ func NewConstNativeHistogram(
 	schema int32,
 	zeroThreshold float64,
 	createdTimestamp time.Time,
-	exemplars []*dto.Exemplar,
 	labelValues ...string,
 ) (Metric, error) {
 	if desc.err != nil {
@@ -1920,9 +1910,6 @@ func NewConstNativeHistogram(
 	if err := validateCount(sum, count, negativeBuckets, positiveBuckets, zeroBucket); err != nil {
 		return nil, err
 	}
-	if err := validateExemplars(exemplars); err != nil {
-		return nil, err
-	}
 
 	NegativeSpan, NegativeDelta := makeBucketsFromMap(negativeBuckets)
 	PositiveSpan, PositiveDelta := makeBucketsFromMap(positiveBuckets)
@@ -1932,7 +1919,6 @@ func NewConstNativeHistogram(
 			CreatedTimestamp: timestamppb.New(createdTimestamp),
 			Schema:           &schema,
 			ZeroThreshold:    &zeroThreshold,
-			Exemplars:        exemplars,
 			SampleCount:      &count,
 			SampleSum:        &sum,
 
@@ -1964,7 +1950,6 @@ func MustNewConstNativeHistogram(
 	nativeHistogramSchema int32,
 	nativeHistogramZeroThreshold float64,
 	createdTimestamp time.Time,
-	exemplars []*dto.Exemplar,
 	labelValues ...string,
 ) Metric {
 	nativehistogram, err := NewConstNativeHistogram(desc,
@@ -1976,7 +1961,6 @@ func MustNewConstNativeHistogram(
 		nativeHistogramSchema,
 		nativeHistogramZeroThreshold,
 		createdTimestamp,
-		exemplars,
 		labelValues...)
 	if err != nil {
 		panic(err)

prometheus/histogram_test.go

@@ -1980,7 +1980,6 @@ func TestConstNativeHistogram(t *testing.T) {
 				cold.nativeHistogramSchema,
 				math.Float64frombits(cold.nativeHistogramZeroThresholdBits),
 				_his.lastResetTime,
-				_his.nativeExemplars.exemplars,
 			)
 			if err != nil {
 				t.Fatal("unexpected error writing metric", err)