Update deps without licenses

The following packes did not have discernible LICENSE files at the hash we have
vendored:
  github.com/beorn7/perks
  github.com/daviddengcn/go-colortext
  github.com/garyburd/redigo
  github.com/prometheus/common
  github.com/shurcooL/sanitized_anchor_name
  github.com/stretchr/objx

This commit updates all of them and updates the central LICENSE file.

vendor/github.com/prometheus/common/model/alert.go

@@ -0,0 +1,136 @@
+// Copyright 2013 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package model
+
+import (
+	"fmt"
+	"time"
+)
+
+type AlertStatus string
+
+const (
+	AlertFiring   AlertStatus = "firing"
+	AlertResolved AlertStatus = "resolved"
+)
+
+// Alert is a generic representation of an alert in the Prometheus eco-system.
+type Alert struct {
+	// Label value pairs for purpose of aggregation, matching, and disposition
+	// dispatching. This must minimally include an "alertname" label.
+	Labels LabelSet `json:"labels"`
+
+	// Extra key/value information which does not define alert identity.
+	Annotations LabelSet `json:"annotations"`
+
+	// The known time range for this alert. Both ends are optional.
+	StartsAt     time.Time `json:"startsAt,omitempty"`
+	EndsAt       time.Time `json:"endsAt,omitempty"`
+	GeneratorURL string    `json:"generatorURL"`
+}
+
+// Name returns the name of the alert. It is equivalent to the "alertname" label.
+func (a *Alert) Name() string {
+	return string(a.Labels[AlertNameLabel])
+}
+
+// Fingerprint returns a unique hash for the alert. It is equivalent to
+// the fingerprint of the alert's label set.
+func (a *Alert) Fingerprint() Fingerprint {
+	return a.Labels.Fingerprint()
+}
+
+func (a *Alert) String() string {
+	s := fmt.Sprintf("%s[%s]", a.Name(), a.Fingerprint().String()[:7])
+	if a.Resolved() {
+		return s + "[resolved]"
+	}
+	return s + "[active]"
+}
+
+// Resolved returns true iff the activity interval ended in the past.
+func (a *Alert) Resolved() bool {
+	return a.ResolvedAt(time.Now())
+}
+
+// ResolvedAt returns true off the activity interval ended before
+// the given timestamp.
+func (a *Alert) ResolvedAt(ts time.Time) bool {
+	if a.EndsAt.IsZero() {
+		return false
+	}
+	return !a.EndsAt.After(ts)
+}
+
+// Status returns the status of the alert.
+func (a *Alert) Status() AlertStatus {
+	if a.Resolved() {
+		return AlertResolved
+	}
+	return AlertFiring
+}
+
+// Validate checks whether the alert data is inconsistent.
+func (a *Alert) Validate() error {
+	if a.StartsAt.IsZero() {
+		return fmt.Errorf("start time missing")
+	}
+	if !a.EndsAt.IsZero() && a.EndsAt.Before(a.StartsAt) {
+		return fmt.Errorf("start time must be before end time")
+	}
+	if err := a.Labels.Validate(); err != nil {
+		return fmt.Errorf("invalid label set: %s", err)
+	}
+	if len(a.Labels) == 0 {
+		return fmt.Errorf("at least one label pair required")
+	}
+	if err := a.Annotations.Validate(); err != nil {
+		return fmt.Errorf("invalid annotations: %s", err)
+	}
+	return nil
+}
+
+// Alert is a list of alerts that can be sorted in chronological order.
+type Alerts []*Alert
+
+func (as Alerts) Len() int      { return len(as) }
+func (as Alerts) Swap(i, j int) { as[i], as[j] = as[j], as[i] }
+
+func (as Alerts) Less(i, j int) bool {
+	if as[i].StartsAt.Before(as[j].StartsAt) {
+		return true
+	}
+	if as[i].EndsAt.Before(as[j].EndsAt) {
+		return true
+	}
+	return as[i].Fingerprint() < as[j].Fingerprint()
+}
+
+// HasFiring returns true iff one of the alerts is not resolved.
+func (as Alerts) HasFiring() bool {
+	for _, a := range as {
+		if !a.Resolved() {
+			return true
+		}
+	}
+	return false
+}
+
+// Status returns StatusFiring iff at least one of the alerts is firing.
+func (as Alerts) Status() AlertStatus {
+	if as.HasFiring() {
+		return AlertFiring
+	}
+	return AlertResolved
+}

vendor/github.com/prometheus/common/model/fnv.go

@@ -0,0 +1,42 @@
+// Copyright 2015 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package model
+
+// Inline and byte-free variant of hash/fnv's fnv64a.
+
+const (
+	offset64 = 14695981039346656037
+	prime64  = 1099511628211
+)
+
+// hashNew initializies a new fnv64a hash value.
+func hashNew() uint64 {
+	return offset64
+}
+
+// hashAdd adds a string to a fnv64a hash value, returning the updated hash.
+func hashAdd(h uint64, s string) uint64 {
+	for i := 0; i < len(s); i++ {
+		h ^= uint64(s[i])
+		h *= prime64
+	}
+	return h
+}
+
+// hashAddByte adds a byte to a fnv64a hash value, returning the updated hash.
+func hashAddByte(h uint64, b byte) uint64 {
+	h ^= uint64(b)
+	h *= prime64
+	return h
+}

vendor/github.com/prometheus/common/model/labels.go

@@ -17,8 +17,8 @@ import (
 	"encoding/json"
 	"fmt"
 	"regexp"
-	"sort"
 	"strings"
+	"unicode/utf8"
 )
 
 const (
@@ -87,6 +87,19 @@ var LabelNameRE = regexp.MustCompile("^[a-zA-Z_][a-zA-Z0-9_]*$")
 // therewith.
 type LabelName string
 
+// IsValid is true iff the label name matches the pattern of LabelNameRE.
+func (ln LabelName) IsValid() bool {
+	if len(ln) == 0 {
+		return false
+	}
+	for i, b := range ln {
+		if !((b >= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z') || b == '_' || (b >= '0' && b <= '9' && i > 0)) {
+			return false
+		}
+	}
+	return true
+}
+
 // UnmarshalYAML implements the yaml.Unmarshaler interface.
 func (ln *LabelName) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	var s string
@@ -139,6 +152,11 @@ func (l LabelNames) String() string {
 // A LabelValue is an associated value for a LabelName.
 type LabelValue string
 
+// IsValid returns true iff the string is a valid UTF8.
+func (lv LabelValue) IsValid() bool {
+	return utf8.ValidString(string(lv))
+}
+
 // LabelValues is a sortable LabelValue slice. It implements sort.Interface.
 type LabelValues []LabelValue
 
@@ -147,7 +165,7 @@ func (l LabelValues) Len() int {
 }
 
 func (l LabelValues) Less(i, j int) bool {
-	return sort.StringsAreSorted([]string{string(l[i]), string(l[j])})
+	return string(l[i]) < string(l[j])
 }
 
 func (l LabelValues) Swap(i, j int) {

vendor/github.com/prometheus/common/model/labelset.go

@@ -27,6 +27,21 @@ import (
 // match.
 type LabelSet map[LabelName]LabelValue
 
+// Validate checks whether all names and values in the label set
+// are valid.
+func (ls LabelSet) Validate() error {
+	for ln, lv := range ls {
+		if !ln.IsValid() {
+			return fmt.Errorf("invalid name %q", ln)
+		}
+		if !lv.IsValid() {
+			return fmt.Errorf("invalid value %q", lv)
+		}
+	}
+	return nil
+}
+
+// Equal returns true iff both label sets have exactly the same key/value pairs.
 func (ls LabelSet) Equal(o LabelSet) bool {
 	if len(ls) != len(o) {
 		return false
@@ -90,6 +105,7 @@ func (ls LabelSet) Before(o LabelSet) bool {
 	return false
 }
 
+// Clone returns a copy of the label set.
 func (ls LabelSet) Clone() LabelSet {
 	lsn := make(LabelSet, len(ls))
 	for ln, lv := range ls {

vendor/github.com/prometheus/common/model/metric.go

@@ -15,11 +15,15 @@ package model
 
 import (
 	"fmt"
+	"regexp"
 	"sort"
 	"strings"
 )
 
-var separator = []byte{0}
+var (
+	separator    = []byte{0}
+	MetricNameRE = regexp.MustCompile(`^[a-zA-Z_][a-zA-Z0-9_:]*$`)
+)
 
 // A Metric is similar to a LabelSet, but the key difference is that a Metric is
 // a singleton and refers to one and only one stream of samples.
@@ -79,3 +83,16 @@ func (m Metric) Fingerprint() Fingerprint {
 func (m Metric) FastFingerprint() Fingerprint {
 	return LabelSet(m).FastFingerprint()
 }
+
+// IsValidMetricName returns true iff name matches the pattern of MetricNameRE.
+func IsValidMetricName(n LabelValue) bool {
+	if len(n) == 0 {
+		return false
+	}
+	for i, b := range n {
+		if !((b >= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z') || b == '_' || b == ':' || (b >= '0' && b <= '9' && i > 0)) {
+			return false
+		}
+	}
+	return true
+}

vendor/github.com/prometheus/common/model/signature.go

@@ -14,11 +14,7 @@
 package model
 
 import (
-	"bytes"
-	"hash"
-	"hash/fnv"
 	"sort"
-	"sync"
 )
 
 // SeparatorByte is a byte that cannot occur in valid UTF-8 sequences and is
@@ -28,30 +24,9 @@ const SeparatorByte byte = 255
 
 var (
 	// cache the signature of an empty label set.
-	emptyLabelSignature = fnv.New64a().Sum64()
-
-	hashAndBufPool sync.Pool
+	emptyLabelSignature = hashNew()
 )
 
-type hashAndBuf struct {
-	h hash.Hash64
-	b bytes.Buffer
-}
-
-func getHashAndBuf() *hashAndBuf {
-	hb := hashAndBufPool.Get()
-	if hb == nil {
-		return &hashAndBuf{h: fnv.New64a()}
-	}
-	return hb.(*hashAndBuf)
-}
-
-func putHashAndBuf(hb *hashAndBuf) {
-	hb.h.Reset()
-	hb.b.Reset()
-	hashAndBufPool.Put(hb)
-}
-
 // LabelsToSignature returns a quasi-unique signature (i.e., fingerprint) for a
 // given label set. (Collisions are possible but unlikely if the number of label
 // sets the function is applied to is small.)
@@ -66,18 +41,14 @@ func LabelsToSignature(labels map[string]string) uint64 {
 	}
 	sort.Strings(labelNames)
 
-	hb := getHashAndBuf()
-	defer putHashAndBuf(hb)
-
+	sum := hashNew()
 	for _, labelName := range labelNames {
-		hb.b.WriteString(labelName)
-		hb.b.WriteByte(SeparatorByte)
-		hb.b.WriteString(labels[labelName])
-		hb.b.WriteByte(SeparatorByte)
-		hb.h.Write(hb.b.Bytes())
-		hb.b.Reset()
+		sum = hashAdd(sum, labelName)
+		sum = hashAddByte(sum, SeparatorByte)
+		sum = hashAdd(sum, labels[labelName])
+		sum = hashAddByte(sum, SeparatorByte)
 	}
-	return hb.h.Sum64()
+	return sum
 }
 
 // labelSetToFingerprint works exactly as LabelsToSignature but takes a LabelSet as
@@ -93,18 +64,14 @@ func labelSetToFingerprint(ls LabelSet) Fingerprint {
 	}
 	sort.Sort(labelNames)
 
-	hb := getHashAndBuf()
-	defer putHashAndBuf(hb)
-
+	sum := hashNew()
 	for _, labelName := range labelNames {
-		hb.b.WriteString(string(labelName))
-		hb.b.WriteByte(SeparatorByte)
-		hb.b.WriteString(string(ls[labelName]))
-		hb.b.WriteByte(SeparatorByte)
-		hb.h.Write(hb.b.Bytes())
-		hb.b.Reset()
+		sum = hashAdd(sum, string(labelName))
+		sum = hashAddByte(sum, SeparatorByte)
+		sum = hashAdd(sum, string(ls[labelName]))
+		sum = hashAddByte(sum, SeparatorByte)
 	}
-	return Fingerprint(hb.h.Sum64())
+	return Fingerprint(sum)
 }
 
 // labelSetToFastFingerprint works similar to labelSetToFingerprint but uses a
@@ -116,17 +83,12 @@ func labelSetToFastFingerprint(ls LabelSet) Fingerprint {
 	}
 
 	var result uint64
-	hb := getHashAndBuf()
-	defer putHashAndBuf(hb)
-
 	for labelName, labelValue := range ls {
-		hb.b.WriteString(string(labelName))
-		hb.b.WriteByte(SeparatorByte)
-		hb.b.WriteString(string(labelValue))
-		hb.h.Write(hb.b.Bytes())
-		result ^= hb.h.Sum64()
-		hb.h.Reset()
-		hb.b.Reset()
+		sum := hashNew()
+		sum = hashAdd(sum, string(labelName))
+		sum = hashAddByte(sum, SeparatorByte)
+		sum = hashAdd(sum, string(labelValue))
+		result ^= sum
 	}
 	return Fingerprint(result)
 }
@@ -136,24 +98,20 @@ func labelSetToFastFingerprint(ls LabelSet) Fingerprint {
 // specified LabelNames into the signature calculation. The labels passed in
 // will be sorted by this function.
 func SignatureForLabels(m Metric, labels ...LabelName) uint64 {
-	if len(m) == 0 || len(labels) == 0 {
+	if len(labels) == 0 {
 		return emptyLabelSignature
 	}
 
 	sort.Sort(LabelNames(labels))
 
-	hb := getHashAndBuf()
-	defer putHashAndBuf(hb)
-
+	sum := hashNew()
 	for _, label := range labels {
-		hb.b.WriteString(string(label))
-		hb.b.WriteByte(SeparatorByte)
-		hb.b.WriteString(string(m[label]))
-		hb.b.WriteByte(SeparatorByte)
-		hb.h.Write(hb.b.Bytes())
-		hb.b.Reset()
+		sum = hashAdd(sum, string(label))
+		sum = hashAddByte(sum, SeparatorByte)
+		sum = hashAdd(sum, string(m[label]))
+		sum = hashAddByte(sum, SeparatorByte)
 	}
-	return hb.h.Sum64()
+	return sum
 }
 
 // SignatureWithoutLabels works like LabelsToSignature but takes a Metric as
@@ -175,16 +133,12 @@ func SignatureWithoutLabels(m Metric, labels map[LabelName]struct{}) uint64 {
 	}
 	sort.Sort(labelNames)
 
-	hb := getHashAndBuf()
-	defer putHashAndBuf(hb)
-
+	sum := hashNew()
 	for _, labelName := range labelNames {
-		hb.b.WriteString(string(labelName))
-		hb.b.WriteByte(SeparatorByte)
-		hb.b.WriteString(string(m[labelName]))
-		hb.b.WriteByte(SeparatorByte)
-		hb.h.Write(hb.b.Bytes())
-		hb.b.Reset()
+		sum = hashAdd(sum, string(labelName))
+		sum = hashAddByte(sum, SeparatorByte)
+		sum = hashAdd(sum, string(m[labelName]))
+		sum = hashAddByte(sum, SeparatorByte)
 	}
-	return hb.h.Sum64()
+	return sum
 }

vendor/github.com/prometheus/common/model/silence.go

@@ -0,0 +1,106 @@
+// Copyright 2015 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package model
+
+import (
+	"encoding/json"
+	"fmt"
+	"regexp"
+	"time"
+)
+
+// Matcher describes a matches the value of a given label.
+type Matcher struct {
+	Name    LabelName `json:"name"`
+	Value   string    `json:"value"`
+	IsRegex bool      `json:"isRegex"`
+}
+
+func (m *Matcher) UnmarshalJSON(b []byte) error {
+	type plain Matcher
+	if err := json.Unmarshal(b, (*plain)(m)); err != nil {
+		return err
+	}
+
+	if len(m.Name) == 0 {
+		return fmt.Errorf("label name in matcher must not be empty")
+	}
+	if m.IsRegex {
+		if _, err := regexp.Compile(m.Value); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// Validate returns true iff all fields of the matcher have valid values.
+func (m *Matcher) Validate() error {
+	if !m.Name.IsValid() {
+		return fmt.Errorf("invalid name %q", m.Name)
+	}
+	if m.IsRegex {
+		if _, err := regexp.Compile(m.Value); err != nil {
+			return fmt.Errorf("invalid regular expression %q", m.Value)
+		}
+	} else if !LabelValue(m.Value).IsValid() || len(m.Value) == 0 {
+		return fmt.Errorf("invalid value %q", m.Value)
+	}
+	return nil
+}
+
+// Silence defines the representation of a silence definiton
+// in the Prometheus eco-system.
+type Silence struct {
+	ID uint64 `json:"id,omitempty"`
+
+	Matchers []*Matcher `json:"matchers"`
+
+	StartsAt time.Time `json:"startsAt"`
+	EndsAt   time.Time `json:"endsAt"`
+
+	CreatedAt time.Time `json:"createdAt,omitempty"`
+	CreatedBy string    `json:"createdBy"`
+	Comment   string    `json:"comment,omitempty"`
+}
+
+// Validate returns true iff all fields of the silence have valid values.
+func (s *Silence) Validate() error {
+	if len(s.Matchers) == 0 {
+		return fmt.Errorf("at least one matcher required")
+	}
+	for _, m := range s.Matchers {
+		if err := m.Validate(); err != nil {
+			return fmt.Errorf("invalid matcher: %s", err)
+		}
+	}
+	if s.StartsAt.IsZero() {
+		return fmt.Errorf("start time missing")
+	}
+	if s.EndsAt.IsZero() {
+		return fmt.Errorf("end time missing")
+	}
+	if s.EndsAt.Before(s.StartsAt) {
+		return fmt.Errorf("start time must be before end time")
+	}
+	if s.CreatedBy == "" {
+		return fmt.Errorf("creator information missing")
+	}
+	if s.Comment == "" {
+		return fmt.Errorf("comment missing")
+	}
+	if s.CreatedAt.IsZero() {
+		return fmt.Errorf("creation timestamp missing")
+	}
+	return nil
+}

vendor/github.com/prometheus/common/model/time.go

@@ -163,51 +163,70 @@ func (t *Time) UnmarshalJSON(b []byte) error {
 // This type should not propagate beyond the scope of input/output processing.
 type Duration time.Duration
 
+var durationRE = regexp.MustCompile("^([0-9]+)(y|w|d|h|m|s|ms)$")
+
 // StringToDuration parses a string into a time.Duration, assuming that a year
-// a day always has 24h.
+// always has 365d, a week always has 7d, and a day always has 24h.
 func ParseDuration(durationStr string) (Duration, error) {
 	matches := durationRE.FindStringSubmatch(durationStr)
 	if len(matches) != 3 {
 		return 0, fmt.Errorf("not a valid duration string: %q", durationStr)
 	}
-	durSeconds, _ := strconv.Atoi(matches[1])
-	dur := time.Duration(durSeconds) * time.Second
-	unit := matches[2]
-	switch unit {
+	var (
+		n, _ = strconv.Atoi(matches[1])
+		dur  = time.Duration(n) * time.Millisecond
+	)
+	switch unit := matches[2]; unit {
+	case "y":
+		dur *= 1000 * 60 * 60 * 24 * 365
+	case "w":
+		dur *= 1000 * 60 * 60 * 24 * 7
 	case "d":
-		dur *= 60 * 60 * 24
+		dur *= 1000 * 60 * 60 * 24
 	case "h":
-		dur *= 60 * 60
+		dur *= 1000 * 60 * 60
 	case "m":
-		dur *= 60
+		dur *= 1000 * 60
 	case "s":
-		dur *= 1
+		dur *= 1000
+	case "ms":
+		// Value already correct
 	default:
 		return 0, fmt.Errorf("invalid time unit in duration string: %q", unit)
 	}
 	return Duration(dur), nil
 }
 
-var durationRE = regexp.MustCompile("^([0-9]+)([ywdhms]+)$")
-
 func (d Duration) String() string {
-	seconds := int64(time.Duration(d) / time.Second)
+	var (
+		ms   = int64(time.Duration(d) / time.Millisecond)
+		unit = "ms"
+	)
 	factors := map[string]int64{
-		"d": 60 * 60 * 24,
-		"h": 60 * 60,
-		"m": 60,
-		"s": 1,
+		"y":  1000 * 60 * 60 * 24 * 365,
+		"w":  1000 * 60 * 60 * 24 * 7,
+		"d":  1000 * 60 * 60 * 24,
+		"h":  1000 * 60 * 60,
+		"m":  1000 * 60,
+		"s":  1000,
+		"ms": 1,
 	}
-	unit := "s"
+
 	switch int64(0) {
-	case seconds % factors["d"]:
+	case ms % factors["y"]:
+		unit = "y"
+	case ms % factors["w"]:
+		unit = "w"
+	case ms % factors["d"]:
 		unit = "d"
-	case seconds % factors["h"]:
+	case ms % factors["h"]:
 		unit = "h"
-	case seconds % factors["m"]:
+	case ms % factors["m"]:
 		unit = "m"
+	case ms % factors["s"]:
+		unit = "s"
 	}
-	return fmt.Sprintf("%v%v", seconds/factors[unit], unit)
+	return fmt.Sprintf("%v%v", ms/factors[unit], unit)
 }
 
 // MarshalYAML implements the yaml.Marshaler interface.

vendor/github.com/prometheus/common/model/value.go

@@ -16,6 +16,7 @@ package model
 import (
 	"encoding/json"
 	"fmt"
+	"math"
 	"sort"
 	"strconv"
 	"strings"
@@ -43,8 +44,14 @@ func (v *SampleValue) UnmarshalJSON(b []byte) error {
 	return nil
 }
 
+// Equal returns true if the value of v and o is equal or if both are NaN. Note
+// that v==o is false if both are NaN. If you want the conventional float
+// behavior, use == to compare two SampleValues.
 func (v SampleValue) Equal(o SampleValue) bool {
-	return v == o
+	if v == o {
+		return true
+	}
+	return math.IsNaN(float64(v)) && math.IsNaN(float64(o))
 }
 
 func (v SampleValue) String() string {
@@ -77,9 +84,9 @@ func (s *SamplePair) UnmarshalJSON(b []byte) error {
 }
 
 // Equal returns true if this SamplePair and o have equal Values and equal
-// Timestamps.
+// Timestamps. The sematics of Value equality is defined by SampleValue.Equal.
 func (s *SamplePair) Equal(o *SamplePair) bool {
-	return s == o || (s.Value == o.Value && s.Timestamp.Equal(o.Timestamp))
+	return s == o || (s.Value.Equal(o.Value) && s.Timestamp.Equal(o.Timestamp))
 }
 
 func (s SamplePair) String() string {
@@ -93,7 +100,8 @@ type Sample struct {
 	Timestamp Time        `json:"timestamp"`
 }
 
-// Equal compares first the metrics, then the timestamp, then the value.
+// Equal compares first the metrics, then the timestamp, then the value. The
+// sematics of value equality is defined by SampleValue.Equal.
 func (s *Sample) Equal(o *Sample) bool {
 	if s == o {
 		return true
@@ -105,7 +113,7 @@ func (s *Sample) Equal(o *Sample) bool {
 	if !s.Timestamp.Equal(o.Timestamp) {
 		return false
 	}
-	if s.Value != o.Value {
+	if s.Value.Equal(o.Value) {
 		return false
 	}