diff --git a/promql/engine.go b/promql/engine.go
index 3ba650187..e4406a08d 100644
--- a/promql/engine.go
+++ b/promql/engine.go
@@ -33,8 +33,8 @@ import (
 
 // SampleStream is a stream of Values belonging to an attached COWMetric.
 type SampleStream struct {
-	Metric model.COWMetric `json:"metric"`
-	Values metric.Values   `json:"values"`
+	Metric model.COWMetric    `json:"metric"`
+	Values []model.SamplePair `json:"values"`
 }
 
 // Sample is a single sample belonging to a COWMetric.
@@ -47,11 +47,11 @@ type Sample struct {
 // MarshalJSON implements json.Marshaler.
 func (s *Sample) MarshalJSON() ([]byte, error) {
 	v := struct {
-		Metric model.COWMetric   `json:"metric"`
-		Value  metric.SamplePair `json:"value"`
+		Metric model.COWMetric  `json:"metric"`
+		Value  model.SamplePair `json:"value"`
 	}{
 		Metric: s.Metric,
-		Value: metric.SamplePair{
+		Value: model.SamplePair{
 			Timestamp: s.Timestamp,
 			Value:     s.Value,
 		},
@@ -480,10 +480,10 @@ func (ng *Engine) execEvalStmt(ctx context.Context, query *query, s *EvalStmt) (
 			// as the fingerprint for scalar expressions.
 			ss := sampleStreams[0]
 			if ss == nil {
-				ss = &SampleStream{Values: make(metric.Values, 0, numSteps)}
+				ss = &SampleStream{Values: make([]model.SamplePair, 0, numSteps)}
 				sampleStreams[0] = ss
 			}
-			ss.Values = append(ss.Values, metric.SamplePair{
+			ss.Values = append(ss.Values, model.SamplePair{
 				Value:     v.Value,
 				Timestamp: v.Timestamp,
 			})
@@ -494,11 +494,11 @@ func (ng *Engine) execEvalStmt(ctx context.Context, query *query, s *EvalStmt) (
 				if ss == nil {
 					ss = &SampleStream{
 						Metric: sample.Metric,
-						Values: make(metric.Values, 0, numSteps),
+						Values: make([]model.SamplePair, 0, numSteps),
 					}
 					sampleStreams[fp] = ss
 				}
-				ss.Values = append(ss.Values, metric.SamplePair{
+				ss.Values = append(ss.Values, model.SamplePair{
 					Value:     sample.Value,
 					Timestamp: sample.Timestamp,
 				})
@@ -1177,9 +1177,9 @@ var StalenessDelta = 5 * time.Minute
 // surrounding a given target time. If samples are found both before and after
 // the target time, the sample value is interpolated between these. Otherwise,
 // the single closest sample is returned verbatim.
-func chooseClosestSample(samples metric.Values, timestamp model.Time) *metric.SamplePair {
-	var closestBefore *metric.SamplePair
-	var closestAfter *metric.SamplePair
+func chooseClosestSample(samples []model.SamplePair, timestamp model.Time) *model.SamplePair {
+	var closestBefore *model.SamplePair
+	var closestAfter *model.SamplePair
 	for _, candidate := range samples {
 		delta := candidate.Timestamp.Sub(timestamp)
 		// Samples before target time.
@@ -1223,14 +1223,14 @@ func chooseClosestSample(samples metric.Values, timestamp model.Time) *metric.Sa
 
 // interpolateSamples interpolates a value at a target time between two
 // provided sample pairs.
-func interpolateSamples(first, second *metric.SamplePair, timestamp model.Time) *metric.SamplePair {
+func interpolateSamples(first, second *model.SamplePair, timestamp model.Time) *model.SamplePair {
 	dv := second.Value - first.Value
 	dt := second.Timestamp.Sub(first.Timestamp)
 
 	dDt := dv / model.SampleValue(dt)
 	offset := model.SampleValue(timestamp.Sub(first.Timestamp))
 
-	return &metric.SamplePair{
+	return &model.SamplePair{
 		Value:     first.Value + (offset * dDt),
 		Timestamp: timestamp,
 	}
diff --git a/promql/functions.go b/promql/functions.go
index 570eedb59..a74538c99 100644
--- a/promql/functions.go
+++ b/promql/functions.go
@@ -258,7 +258,7 @@ func funcCountScalar(ev *evaluator, args Expressions) Value {
 	}
 }
 
-func aggrOverTime(ev *evaluator, args Expressions, aggrFn func(metric.Values) model.SampleValue) Value {
+func aggrOverTime(ev *evaluator, args Expressions, aggrFn func([]model.SamplePair) model.SampleValue) Value {
 	matrix := ev.evalMatrix(args[0])
 	resultVector := Vector{}
 
@@ -279,7 +279,7 @@ func aggrOverTime(ev *evaluator, args Expressions, aggrFn func(metric.Values) mo
 
 // === avg_over_time(matrix ExprMatrix) Vector ===
 func funcAvgOverTime(ev *evaluator, args Expressions) Value {
-	return aggrOverTime(ev, args, func(values metric.Values) model.SampleValue {
+	return aggrOverTime(ev, args, func(values []model.SamplePair) model.SampleValue {
 		var sum model.SampleValue
 		for _, v := range values {
 			sum += v.Value
@@ -290,7 +290,7 @@ func funcAvgOverTime(ev *evaluator, args Expressions) Value {
 
 // === count_over_time(matrix ExprMatrix) Vector ===
 func funcCountOverTime(ev *evaluator, args Expressions) Value {
-	return aggrOverTime(ev, args, func(values metric.Values) model.SampleValue {
+	return aggrOverTime(ev, args, func(values []model.SamplePair) model.SampleValue {
 		return model.SampleValue(len(values))
 	})
 }
@@ -307,7 +307,7 @@ func funcFloor(ev *evaluator, args Expressions) Value {
 
 // === max_over_time(matrix ExprMatrix) Vector ===
 func funcMaxOverTime(ev *evaluator, args Expressions) Value {
-	return aggrOverTime(ev, args, func(values metric.Values) model.SampleValue {
+	return aggrOverTime(ev, args, func(values []model.SamplePair) model.SampleValue {
 		max := math.Inf(-1)
 		for _, v := range values {
 			max = math.Max(max, float64(v.Value))
@@ -318,7 +318,7 @@ func funcMaxOverTime(ev *evaluator, args Expressions) Value {
 
 // === min_over_time(matrix ExprMatrix) Vector ===
 func funcMinOverTime(ev *evaluator, args Expressions) Value {
-	return aggrOverTime(ev, args, func(values metric.Values) model.SampleValue {
+	return aggrOverTime(ev, args, func(values []model.SamplePair) model.SampleValue {
 		min := math.Inf(1)
 		for _, v := range values {
 			min = math.Min(min, float64(v.Value))
@@ -329,7 +329,7 @@ func funcMinOverTime(ev *evaluator, args Expressions) Value {
 
 // === sum_over_time(matrix ExprMatrix) Vector ===
 func funcSumOverTime(ev *evaluator, args Expressions) Value {
-	return aggrOverTime(ev, args, func(values metric.Values) model.SampleValue {
+	return aggrOverTime(ev, args, func(values []model.SamplePair) model.SampleValue {
 		var sum model.SampleValue
 		for _, v := range values {
 			sum += v.Value
diff --git a/promql/test.go b/promql/test.go
index 13ecec741..fecc89caf 100644
--- a/promql/test.go
+++ b/promql/test.go
@@ -26,7 +26,6 @@ import (
 
 	"github.com/prometheus/prometheus/storage"
 	"github.com/prometheus/prometheus/storage/local"
-	"github.com/prometheus/prometheus/storage/metric"
 	"github.com/prometheus/prometheus/util/strutil"
 	"github.com/prometheus/prometheus/util/testutil"
 )
@@ -239,14 +238,14 @@ func (*evalCmd) testCmd()  {}
 type loadCmd struct {
 	gap     time.Duration
 	metrics map[model.Fingerprint]model.Metric
-	defs    map[model.Fingerprint]metric.Values
+	defs    map[model.Fingerprint][]model.SamplePair
 }
 
 func newLoadCmd(gap time.Duration) *loadCmd {
 	return &loadCmd{
 		gap:     gap,
 		metrics: map[model.Fingerprint]model.Metric{},
-		defs:    map[model.Fingerprint]metric.Values{},
+		defs:    map[model.Fingerprint][]model.SamplePair{},
 	}
 }
 
@@ -258,11 +257,11 @@ func (cmd loadCmd) String() string {
 func (cmd *loadCmd) set(m model.Metric, vals ...sequenceValue) {
 	fp := m.Fingerprint()
 
-	samples := make(metric.Values, 0, len(vals))
+	samples := make([]model.SamplePair, 0, len(vals))
 	ts := testStartTime
 	for _, v := range vals {
 		if !v.omitted {
-			samples = append(samples, metric.SamplePair{
+			samples = append(samples, model.SamplePair{
 				Timestamp: ts,
 				Value:     v.value,
 			})
diff --git a/storage/local/chunk.go b/storage/local/chunk.go
index c6463ad3a..831b7e2a2 100644
--- a/storage/local/chunk.go
+++ b/storage/local/chunk.go
@@ -78,7 +78,7 @@ func newChunkDesc(c chunk) *chunkDesc {
 	return &chunkDesc{c: c, rCnt: 1}
 }
 
-func (cd *chunkDesc) add(s *metric.SamplePair) []chunk {
+func (cd *chunkDesc) add(s *model.SamplePair) []chunk {
 	cd.Lock()
 	defer cd.Unlock()
 
@@ -143,7 +143,7 @@ func (cd *chunkDesc) lastTime() model.Time {
 	return cd.c.newIterator().lastTimestamp()
 }
 
-func (cd *chunkDesc) lastSamplePair() *metric.SamplePair {
+func (cd *chunkDesc) lastSamplePair() *model.SamplePair {
 	cd.Lock()
 	defer cd.Unlock()
 
@@ -151,7 +151,7 @@ func (cd *chunkDesc) lastSamplePair() *metric.SamplePair {
 		return nil
 	}
 	it := cd.c.newIterator()
-	return &metric.SamplePair{
+	return &model.SamplePair{
 		Timestamp: it.lastTimestamp(),
 		Value:     it.lastSampleValue(),
 	}
@@ -215,7 +215,7 @@ type chunk interface {
 	// any. The first chunk returned might be the same as the original one
 	// or a newly allocated version. In any case, take the returned chunk as
 	// the relevant one and discard the orginal chunk.
-	add(sample *metric.SamplePair) []chunk
+	add(sample *model.SamplePair) []chunk
 	clone() chunk
 	firstTime() model.Time
 	newIterator() chunkIterator
@@ -244,9 +244,9 @@ type chunkIterator interface {
 	// value is returned. Only the first or last value is returned (as a
 	// single value), if the given time is before or after the first or last
 	// value, respectively.
-	valueAtTime(model.Time) metric.Values
+	valueAtTime(model.Time) []model.SamplePair
 	// Gets all values contained within a given interval.
-	rangeValues(metric.Interval) metric.Values
+	rangeValues(metric.Interval) []model.SamplePair
 	// Whether a given timestamp is contained between first and last value
 	// in the chunk.
 	contains(model.Time) bool
@@ -254,10 +254,10 @@ type chunkIterator interface {
 	// can be received in order. The channel is closed after the last
 	// one. It is generally not safe to mutate the chunk while the channel
 	// is still open.
-	values() <-chan *metric.SamplePair
+	values() <-chan *model.SamplePair
 }
 
-func transcodeAndAdd(dst chunk, src chunk, s *metric.SamplePair) []chunk {
+func transcodeAndAdd(dst chunk, src chunk, s *model.SamplePair) []chunk {
 	chunkOps.WithLabelValues(transcode).Inc()
 
 	head := dst
diff --git a/storage/local/delta.go b/storage/local/delta.go
index dd5e29920..5db3df59a 100644
--- a/storage/local/delta.go
+++ b/storage/local/delta.go
@@ -76,7 +76,7 @@ func newDeltaEncodedChunk(tb, vb deltaBytes, isInt bool, length int) *deltaEncod
 }
 
 // add implements chunk.
-func (c deltaEncodedChunk) add(s *metric.SamplePair) []chunk {
+func (c deltaEncodedChunk) add(s *model.SamplePair) []chunk {
 	if c.len() == 0 {
 		c = c[:deltaHeaderBytes]
 		binary.LittleEndian.PutUint64(c[deltaHeaderBaseTimeOffset:], uint64(s.Timestamp))
@@ -288,36 +288,36 @@ type deltaEncodedChunkIterator struct {
 func (it *deltaEncodedChunkIterator) length() int { return it.len }
 
 // valueAtTime implements chunkIterator.
-func (it *deltaEncodedChunkIterator) valueAtTime(t model.Time) metric.Values {
+func (it *deltaEncodedChunkIterator) valueAtTime(t model.Time) []model.SamplePair {
 	i := sort.Search(it.len, func(i int) bool {
 		return !it.timestampAtIndex(i).Before(t)
 	})
 
 	switch i {
 	case 0:
-		return metric.Values{metric.SamplePair{
+		return []model.SamplePair{{
 			Timestamp: it.timestampAtIndex(0),
 			Value:     it.sampleValueAtIndex(0),
 		}}
 	case it.len:
-		return metric.Values{metric.SamplePair{
+		return []model.SamplePair{{
 			Timestamp: it.timestampAtIndex(it.len - 1),
 			Value:     it.sampleValueAtIndex(it.len - 1),
 		}}
 	default:
 		ts := it.timestampAtIndex(i)
 		if ts.Equal(t) {
-			return metric.Values{metric.SamplePair{
+			return []model.SamplePair{{
 				Timestamp: ts,
 				Value:     it.sampleValueAtIndex(i),
 			}}
 		}
-		return metric.Values{
-			metric.SamplePair{
+		return []model.SamplePair{
+			{
 				Timestamp: it.timestampAtIndex(i - 1),
 				Value:     it.sampleValueAtIndex(i - 1),
 			},
-			metric.SamplePair{
+			{
 				Timestamp: ts,
 				Value:     it.sampleValueAtIndex(i),
 			},
@@ -326,7 +326,7 @@ func (it *deltaEncodedChunkIterator) valueAtTime(t model.Time) metric.Values {
 }
 
 // rangeValues implements chunkIterator.
-func (it *deltaEncodedChunkIterator) rangeValues(in metric.Interval) metric.Values {
+func (it *deltaEncodedChunkIterator) rangeValues(in metric.Interval) []model.SamplePair {
 	oldest := sort.Search(it.len, func(i int) bool {
 		return !it.timestampAtIndex(i).Before(in.OldestInclusive)
 	})
@@ -339,9 +339,9 @@ func (it *deltaEncodedChunkIterator) rangeValues(in metric.Interval) metric.Valu
 		return nil
 	}
 
-	result := make(metric.Values, 0, newest-oldest)
+	result := make([]model.SamplePair, 0, newest-oldest)
 	for i := oldest; i < newest; i++ {
-		result = append(result, metric.SamplePair{
+		result = append(result, model.SamplePair{
 			Timestamp: it.timestampAtIndex(i),
 			Value:     it.sampleValueAtIndex(i),
 		})
@@ -355,11 +355,11 @@ func (it *deltaEncodedChunkIterator) contains(t model.Time) bool {
 }
 
 // values implements chunkIterator.
-func (it *deltaEncodedChunkIterator) values() <-chan *metric.SamplePair {
-	valuesChan := make(chan *metric.SamplePair)
+func (it *deltaEncodedChunkIterator) values() <-chan *model.SamplePair {
+	valuesChan := make(chan *model.SamplePair)
 	go func() {
 		for i := 0; i < it.len; i++ {
-			valuesChan <- &metric.SamplePair{
+			valuesChan <- &model.SamplePair{
 				Timestamp: it.timestampAtIndex(i),
 				Value:     it.sampleValueAtIndex(i),
 			}
diff --git a/storage/local/doubledelta.go b/storage/local/doubledelta.go
index 521a93ae1..d2a983689 100644
--- a/storage/local/doubledelta.go
+++ b/storage/local/doubledelta.go
@@ -83,7 +83,7 @@ func newDoubleDeltaEncodedChunk(tb, vb deltaBytes, isInt bool, length int) *doub
 }
 
 // add implements chunk.
-func (c doubleDeltaEncodedChunk) add(s *metric.SamplePair) []chunk {
+func (c doubleDeltaEncodedChunk) add(s *model.SamplePair) []chunk {
 	if c.len() == 0 {
 		return c.addFirstSample(s)
 	}
@@ -321,7 +321,7 @@ func (c doubleDeltaEncodedChunk) isInt() bool {
 
 // addFirstSample is a helper method only used by c.add(). It adds timestamp and
 // value as base time and value.
-func (c doubleDeltaEncodedChunk) addFirstSample(s *metric.SamplePair) []chunk {
+func (c doubleDeltaEncodedChunk) addFirstSample(s *model.SamplePair) []chunk {
 	c = c[:doubleDeltaHeaderBaseValueOffset+8]
 	binary.LittleEndian.PutUint64(
 		c[doubleDeltaHeaderBaseTimeOffset:],
@@ -336,7 +336,7 @@ func (c doubleDeltaEncodedChunk) addFirstSample(s *metric.SamplePair) []chunk {
 
 // addSecondSample is a helper method only used by c.add(). It calculates the
 // base delta from the provided sample and adds it to the chunk.
-func (c doubleDeltaEncodedChunk) addSecondSample(s *metric.SamplePair, tb, vb deltaBytes) []chunk {
+func (c doubleDeltaEncodedChunk) addSecondSample(s *model.SamplePair, tb, vb deltaBytes) []chunk {
 	baseTimeDelta := s.Timestamp - c.baseTime()
 	if baseTimeDelta < 0 {
 		panic("base time delta is less than zero")
@@ -394,36 +394,36 @@ type doubleDeltaEncodedChunkIterator struct {
 func (it *doubleDeltaEncodedChunkIterator) length() int { return it.len }
 
 // valueAtTime implements chunkIterator.
-func (it *doubleDeltaEncodedChunkIterator) valueAtTime(t model.Time) metric.Values {
+func (it *doubleDeltaEncodedChunkIterator) valueAtTime(t model.Time) []model.SamplePair {
 	i := sort.Search(it.len, func(i int) bool {
 		return !it.timestampAtIndex(i).Before(t)
 	})
 
 	switch i {
 	case 0:
-		return metric.Values{metric.SamplePair{
+		return []model.SamplePair{{
 			Timestamp: it.timestampAtIndex(0),
 			Value:     it.sampleValueAtIndex(0),
 		}}
 	case it.len:
-		return metric.Values{metric.SamplePair{
+		return []model.SamplePair{{
 			Timestamp: it.timestampAtIndex(it.len - 1),
 			Value:     it.sampleValueAtIndex(it.len - 1),
 		}}
 	default:
 		ts := it.timestampAtIndex(i)
 		if ts.Equal(t) {
-			return metric.Values{metric.SamplePair{
+			return []model.SamplePair{{
 				Timestamp: ts,
 				Value:     it.sampleValueAtIndex(i),
 			}}
 		}
-		return metric.Values{
-			metric.SamplePair{
+		return []model.SamplePair{
+			{
 				Timestamp: it.timestampAtIndex(i - 1),
 				Value:     it.sampleValueAtIndex(i - 1),
 			},
-			metric.SamplePair{
+			{
 				Timestamp: ts,
 				Value:     it.sampleValueAtIndex(i),
 			},
@@ -432,7 +432,7 @@ func (it *doubleDeltaEncodedChunkIterator) valueAtTime(t model.Time) metric.Valu
 }
 
 // rangeValues implements chunkIterator.
-func (it *doubleDeltaEncodedChunkIterator) rangeValues(in metric.Interval) metric.Values {
+func (it *doubleDeltaEncodedChunkIterator) rangeValues(in metric.Interval) []model.SamplePair {
 	oldest := sort.Search(it.len, func(i int) bool {
 		return !it.timestampAtIndex(i).Before(in.OldestInclusive)
 	})
@@ -445,9 +445,9 @@ func (it *doubleDeltaEncodedChunkIterator) rangeValues(in metric.Interval) metri
 		return nil
 	}
 
-	result := make(metric.Values, 0, newest-oldest)
+	result := make([]model.SamplePair, 0, newest-oldest)
 	for i := oldest; i < newest; i++ {
-		result = append(result, metric.SamplePair{
+		result = append(result, model.SamplePair{
 			Timestamp: it.timestampAtIndex(i),
 			Value:     it.sampleValueAtIndex(i),
 		})
@@ -461,11 +461,11 @@ func (it *doubleDeltaEncodedChunkIterator) contains(t model.Time) bool {
 }
 
 // values implements chunkIterator.
-func (it *doubleDeltaEncodedChunkIterator) values() <-chan *metric.SamplePair {
-	valuesChan := make(chan *metric.SamplePair)
+func (it *doubleDeltaEncodedChunkIterator) values() <-chan *model.SamplePair {
+	valuesChan := make(chan *model.SamplePair)
 	go func() {
 		for i := 0; i < it.len; i++ {
-			valuesChan <- &metric.SamplePair{
+			valuesChan <- &model.SamplePair{
 				Timestamp: it.timestampAtIndex(i),
 				Value:     it.sampleValueAtIndex(i),
 			}
diff --git a/storage/local/interface.go b/storage/local/interface.go
index 601659056..bf0b356d9 100644
--- a/storage/local/interface.go
+++ b/storage/local/interface.go
@@ -44,7 +44,7 @@ type Storage interface {
 	// LastSamplePairForFingerprint returns the last sample pair for the
 	// provided fingerprint. If the respective time series does not exist or
 	// has an evicted head chunk, nil is returned.
-	LastSamplePairForFingerprint(model.Fingerprint) *metric.SamplePair
+	LastSamplePairForFingerprint(model.Fingerprint) *model.SamplePair
 	// Get all of the label values that are associated with a given label name.
 	LabelValuesForLabelName(model.LabelName) model.LabelValues
 	// Get the metric associated with the provided fingerprint.
@@ -80,12 +80,12 @@ type SeriesIterator interface {
 	// value is returned. Only the first or last value is returned (as a
 	// single value), if the given time is before or after the first or last
 	// value, respectively.
-	ValueAtTime(model.Time) metric.Values
+	ValueAtTime(model.Time) []model.SamplePair
 	// Gets the boundary values of an interval: the first and last value
 	// within a given interval.
-	BoundaryValues(metric.Interval) metric.Values
+	BoundaryValues(metric.Interval) []model.SamplePair
 	// Gets all values contained within a given interval.
-	RangeValues(metric.Interval) metric.Values
+	RangeValues(metric.Interval) []model.SamplePair
 }
 
 // A Preloader preloads series data necessary for a query into memory and pins
diff --git a/storage/local/persistence_test.go b/storage/local/persistence_test.go
index 011c17d28..ea6ce25e6 100644
--- a/storage/local/persistence_test.go
+++ b/storage/local/persistence_test.go
@@ -23,7 +23,6 @@ import (
 
 	"github.com/prometheus/prometheus/storage/local/codable"
 	"github.com/prometheus/prometheus/storage/local/index"
-	"github.com/prometheus/prometheus/storage/metric"
 	"github.com/prometheus/prometheus/util/testutil"
 )
 
@@ -61,7 +60,7 @@ func buildTestChunks(encoding chunkEncoding) map[model.Fingerprint][]chunk {
 	for _, fp := range fps {
 		fpToChunks[fp] = make([]chunk, 0, 10)
 		for i := 0; i < 10; i++ {
-			fpToChunks[fp] = append(fpToChunks[fp], newChunkForEncoding(encoding).add(&metric.SamplePair{
+			fpToChunks[fp] = append(fpToChunks[fp], newChunkForEncoding(encoding).add(&model.SamplePair{
 				Timestamp: model.Time(i),
 				Value:     model.SampleValue(fp),
 			})[0])
@@ -360,16 +359,16 @@ func testCheckpointAndLoadSeriesMapAndHeads(t *testing.T, encoding chunkEncoding
 	s3 := newMemorySeries(m3, nil, time.Time{})
 	s4 := newMemorySeries(m4, nil, time.Time{})
 	s5 := newMemorySeries(m5, nil, time.Time{})
-	s1.add(&metric.SamplePair{Timestamp: 1, Value: 3.14})
-	s3.add(&metric.SamplePair{Timestamp: 2, Value: 2.7})
+	s1.add(&model.SamplePair{Timestamp: 1, Value: 3.14})
+	s3.add(&model.SamplePair{Timestamp: 2, Value: 2.7})
 	s3.headChunkClosed = true
 	s3.persistWatermark = 1
 	for i := 0; i < 10000; i++ {
-		s4.add(&metric.SamplePair{
+		s4.add(&model.SamplePair{
 			Timestamp: model.Time(i),
 			Value:     model.SampleValue(i) / 2,
 		})
-		s5.add(&metric.SamplePair{
+		s5.add(&model.SamplePair{
 			Timestamp: model.Time(i),
 			Value:     model.SampleValue(i * i),
 		})
diff --git a/storage/local/series.go b/storage/local/series.go
index ef158aac6..5de11fcda 100644
--- a/storage/local/series.go
+++ b/storage/local/series.go
@@ -207,7 +207,7 @@ func newMemorySeries(m model.Metric, chunkDescs []*chunkDesc, modTime time.Time)
 // completed chunks (which are now eligible for persistence).
 //
 // The caller must have locked the fingerprint of the series.
-func (s *memorySeries) add(v *metric.SamplePair) int {
+func (s *memorySeries) add(v *model.SamplePair) int {
 	if len(s.chunkDescs) == 0 || s.headChunkClosed {
 		newHead := newChunkDesc(newChunk())
 		s.chunkDescs = append(s.chunkDescs, newHead)
@@ -482,7 +482,7 @@ type memorySeriesIterator struct {
 }
 
 // ValueAtTime implements SeriesIterator.
-func (it *memorySeriesIterator) ValueAtTime(t model.Time) metric.Values {
+func (it *memorySeriesIterator) ValueAtTime(t model.Time) []model.SamplePair {
 	// The most common case. We are iterating through a chunk.
 	if it.chunkIt != nil && it.chunkIt.contains(t) {
 		return it.chunkIt.valueAtTime(t)
@@ -497,7 +497,7 @@ func (it *memorySeriesIterator) ValueAtTime(t model.Time) metric.Values {
 	ts := it.chunkIt.timestampAtIndex(0)
 	if !t.After(ts) {
 		// return first value of first chunk
-		return metric.Values{metric.SamplePair{
+		return []model.SamplePair{{
 			Timestamp: ts,
 			Value:     it.chunkIt.sampleValueAtIndex(0),
 		}}
@@ -508,7 +508,7 @@ func (it *memorySeriesIterator) ValueAtTime(t model.Time) metric.Values {
 	ts = it.chunkIt.lastTimestamp()
 	if !t.Before(ts) {
 		// return last value of last chunk
-		return metric.Values{metric.SamplePair{
+		return []model.SamplePair{{
 			Timestamp: ts,
 			Value:     it.chunkIt.sampleValueAtIndex(it.chunkIt.length() - 1),
 		}}
@@ -526,14 +526,14 @@ func (it *memorySeriesIterator) ValueAtTime(t model.Time) metric.Values {
 	ts = it.chunkIt.lastTimestamp()
 	if t.After(ts) {
 		// We ended up between two chunks.
-		sp1 := metric.SamplePair{
+		sp1 := model.SamplePair{
 			Timestamp: ts,
 			Value:     it.chunkIt.sampleValueAtIndex(it.chunkIt.length() - 1),
 		}
 		it.chunkIt = it.chunkIterator(l - i + 1)
-		return metric.Values{
+		return []model.SamplePair{
 			sp1,
-			metric.SamplePair{
+			model.SamplePair{
 				Timestamp: it.chunkIt.timestampAtIndex(0),
 				Value:     it.chunkIt.sampleValueAtIndex(0),
 			},
@@ -543,7 +543,7 @@ func (it *memorySeriesIterator) ValueAtTime(t model.Time) metric.Values {
 }
 
 // BoundaryValues implements SeriesIterator.
-func (it *memorySeriesIterator) BoundaryValues(in metric.Interval) metric.Values {
+func (it *memorySeriesIterator) BoundaryValues(in metric.Interval) []model.SamplePair {
 	// Find the first chunk for which the first sample is within the interval.
 	i := sort.Search(len(it.chunks), func(i int) bool {
 		return !it.chunks[i].firstTime().Before(in.OldestInclusive)
@@ -554,7 +554,7 @@ func (it *memorySeriesIterator) BoundaryValues(in metric.Interval) metric.Values
 		i--
 	}
 
-	values := make(metric.Values, 0, 2)
+	values := make([]model.SamplePair, 0, 2)
 	for j, c := range it.chunks[i:] {
 		if c.firstTime().After(in.NewestInclusive) {
 			if len(values) == 1 {
@@ -563,7 +563,7 @@ func (it *memorySeriesIterator) BoundaryValues(in metric.Interval) metric.Values
 				// want must be the last value of the previous
 				// chunk. So backtrack...
 				chunkIt := it.chunkIterator(i + j - 1)
-				values = append(values, metric.SamplePair{
+				values = append(values, model.SamplePair{
 					Timestamp: chunkIt.lastTimestamp(),
 					Value:     chunkIt.lastSampleValue(),
 				})
@@ -590,7 +590,7 @@ func (it *memorySeriesIterator) BoundaryValues(in metric.Interval) metric.Values
 	if len(values) == 1 {
 		// We found exactly one value. In that case, add the most recent we know.
 		chunkIt := it.chunkIterator(len(it.chunks) - 1)
-		values = append(values, metric.SamplePair{
+		values = append(values, model.SamplePair{
 			Timestamp: chunkIt.lastTimestamp(),
 			Value:     chunkIt.lastSampleValue(),
 		})
@@ -602,7 +602,7 @@ func (it *memorySeriesIterator) BoundaryValues(in metric.Interval) metric.Values
 }
 
 // RangeValues implements SeriesIterator.
-func (it *memorySeriesIterator) RangeValues(in metric.Interval) metric.Values {
+func (it *memorySeriesIterator) RangeValues(in metric.Interval) []model.SamplePair {
 	// Find the first chunk for which the first sample is within the interval.
 	i := sort.Search(len(it.chunks), func(i int) bool {
 		return !it.chunks[i].firstTime().Before(in.OldestInclusive)
@@ -613,7 +613,7 @@ func (it *memorySeriesIterator) RangeValues(in metric.Interval) metric.Values {
 		i--
 	}
 
-	values := metric.Values{}
+	values := []model.SamplePair{}
 	for j, c := range it.chunks[i:] {
 		if c.firstTime().After(in.NewestInclusive) {
 			break
@@ -638,16 +638,16 @@ func (it *memorySeriesIterator) chunkIterator(i int) chunkIterator {
 type nopSeriesIterator struct{}
 
 // ValueAtTime implements SeriesIterator.
-func (_ nopSeriesIterator) ValueAtTime(t model.Time) metric.Values {
-	return metric.Values{}
+func (_ nopSeriesIterator) ValueAtTime(t model.Time) []model.SamplePair {
+	return []model.SamplePair{}
 }
 
 // BoundaryValues implements SeriesIterator.
-func (_ nopSeriesIterator) BoundaryValues(in metric.Interval) metric.Values {
-	return metric.Values{}
+func (_ nopSeriesIterator) BoundaryValues(in metric.Interval) []model.SamplePair {
+	return []model.SamplePair{}
 }
 
 // RangeValues implements SeriesIterator.
-func (_ nopSeriesIterator) RangeValues(in metric.Interval) metric.Values {
-	return metric.Values{}
+func (_ nopSeriesIterator) RangeValues(in metric.Interval) []model.SamplePair {
+	return []model.SamplePair{}
 }
diff --git a/storage/local/storage.go b/storage/local/storage.go
index fb3f6423d..7883641df 100644
--- a/storage/local/storage.go
+++ b/storage/local/storage.go
@@ -328,7 +328,7 @@ func (s *memorySeriesStorage) NewIterator(fp model.Fingerprint) SeriesIterator {
 }
 
 // LastSampleForFingerprint implements Storage.
-func (s *memorySeriesStorage) LastSamplePairForFingerprint(fp model.Fingerprint) *metric.SamplePair {
+func (s *memorySeriesStorage) LastSamplePairForFingerprint(fp model.Fingerprint) *model.SamplePair {
 	s.fpLocker.Lock(fp)
 	defer s.fpLocker.Unlock(fp)
 
@@ -347,17 +347,17 @@ type boundedIterator struct {
 }
 
 // ValueAtTime implements the SeriesIterator interface.
-func (bit *boundedIterator) ValueAtTime(ts model.Time) metric.Values {
+func (bit *boundedIterator) ValueAtTime(ts model.Time) []model.SamplePair {
 	if ts < bit.start {
-		return metric.Values{}
+		return []model.SamplePair{}
 	}
 	return bit.it.ValueAtTime(ts)
 }
 
 // BoundaryValues implements the SeriesIterator interface.
-func (bit *boundedIterator) BoundaryValues(interval metric.Interval) metric.Values {
+func (bit *boundedIterator) BoundaryValues(interval metric.Interval) []model.SamplePair {
 	if interval.NewestInclusive < bit.start {
-		return metric.Values{}
+		return []model.SamplePair{}
 	}
 	if interval.OldestInclusive < bit.start {
 		interval.OldestInclusive = bit.start
@@ -366,9 +366,9 @@ func (bit *boundedIterator) BoundaryValues(interval metric.Interval) metric.Valu
 }
 
 // RangeValues implements the SeriesIterator interface.
-func (bit *boundedIterator) RangeValues(interval metric.Interval) metric.Values {
+func (bit *boundedIterator) RangeValues(interval metric.Interval) []model.SamplePair {
 	if interval.NewestInclusive < bit.start {
-		return metric.Values{}
+		return []model.SamplePair{}
 	}
 	if interval.OldestInclusive < bit.start {
 		interval.OldestInclusive = bit.start
@@ -570,7 +570,7 @@ func (s *memorySeriesStorage) Append(sample *model.Sample) {
 		s.fpLocker.Unlock(fp)
 		return
 	}
-	completedChunksCount := series.add(&metric.SamplePair{
+	completedChunksCount := series.add(&model.SamplePair{
 		Value:     sample.Value,
 		Timestamp: sample.Timestamp,
 	})
diff --git a/storage/local/storage_test.go b/storage/local/storage_test.go
index 8e600cccf..f7ed9a935 100644
--- a/storage/local/storage_test.go
+++ b/storage/local/storage_test.go
@@ -571,7 +571,7 @@ func testChunk(t *testing.T, encoding chunkEncoding) {
 	for m := range s.fpToSeries.iter() {
 		s.fpLocker.Lock(m.fp)
 
-		var values metric.Values
+		var values []model.SamplePair
 		for _, cd := range m.series.chunkDescs {
 			if cd.isEvicted() {
 				continue
@@ -1527,7 +1527,7 @@ func TestAppendOutOfOrder(t *testing.T) {
 
 	it := s.NewIterator(fp)
 
-	want := metric.Values{
+	want := []model.SamplePair{
 		{
 			Timestamp: 0,
 			Value:     0,
diff --git a/storage/metric/sample.go b/storage/metric/sample.go
index 588edfd17..a30c2b456 100644
--- a/storage/metric/sample.go
+++ b/storage/metric/sample.go
@@ -13,40 +13,7 @@
 
 package metric
 
-import (
-	"fmt"
-	"strconv"
-
-	"github.com/prometheus/common/model"
-)
-
-// MarshalJSON implements json.Marshaler.
-func (s SamplePair) MarshalJSON() ([]byte, error) {
-	return []byte(fmt.Sprintf("[%s, \"%s\"]", s.Timestamp.String(), strconv.FormatFloat(float64(s.Value), 'f', -1, 64))), nil
-}
-
-// SamplePair pairs a SampleValue with a Timestamp.
-type SamplePair struct {
-	Timestamp model.Time
-	Value     model.SampleValue
-}
-
-// Equal returns true if this SamplePair and o have equal Values and equal
-// Timestamps.
-func (s *SamplePair) Equal(o *SamplePair) bool {
-	if s == o {
-		return true
-	}
-
-	return s.Value.Equal(o.Value) && s.Timestamp.Equal(o.Timestamp)
-}
-
-func (s *SamplePair) String() string {
-	return fmt.Sprintf("SamplePair at %s of %s", s.Timestamp, s.Value)
-}
-
-// Values is a slice of SamplePairs.
-type Values []SamplePair
+import "github.com/prometheus/common/model"
 
 // Interval describes the inclusive interval between two Timestamps.
 type Interval struct {
diff --git a/web/api/v1/api_test.go b/web/api/v1/api_test.go
index 64fe3a81d..f5fcac28e 100644
--- a/web/api/v1/api_test.go
+++ b/web/api/v1/api_test.go
@@ -16,7 +16,6 @@ import (
 	"golang.org/x/net/context"
 
 	"github.com/prometheus/prometheus/promql"
-	"github.com/prometheus/prometheus/storage/metric"
 	"github.com/prometheus/prometheus/util/route"
 )
 
@@ -103,7 +102,7 @@ func TestEndpoints(t *testing.T) {
 				ResultType: promql.ExprMatrix,
 				Result: promql.Matrix{
 					&promql.SampleStream{
-						Values: metric.Values{
+						Values: []model.SamplePair{
 							{Value: 0, Timestamp: start},
 							{Value: 1, Timestamp: start.Add(1 * time.Second)},
 							{Value: 2, Timestamp: start.Add(2 * time.Second)},