Bump github.com/prometheus/common from 0.48.0 to 0.54.0

Bumps [github.com/prometheus/common](https://github.com/prometheus/common) from 0.48.0 to 0.54.0.
- [Release notes](https://github.com/prometheus/common/releases)
- [Changelog](https://github.com/prometheus/common/blob/main/RELEASE.md)
- [Commits](https://github.com/prometheus/common/compare/v0.48.0...v0.54.0)

---
updated-dependencies:
- dependency-name: github.com/prometheus/common
  dependency-type: indirect
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

go.mod

@@ -43,7 +43,7 @@ require (
 	github.com/gomodule/redigo v2.0.0+incompatible // indirect
 	github.com/jmespath/go-jmespath v0.4.0 // indirect
 	github.com/prometheus/client_model v0.6.1 // indirect
-	github.com/prometheus/common v0.48.0 // indirect
+	github.com/prometheus/common v0.54.0 // indirect
 	github.com/prometheus/procfs v0.15.1 // indirect
 	github.com/stretchr/testify v1.9.0 // indirect
 	github.com/yuin/gopher-lua v1.1.1 // indirect

go.sum

@@ -118,8 +118,8 @@ github.com/prometheus/client_golang v1.19.1 h1:wZWJDwK+NameRJuPGDhlnFgx8e8HN3XHQ
 github.com/prometheus/client_golang v1.19.1/go.mod h1:mP78NwGzrVks5S2H6ab8+ZZGJLZUq1hoULYBAYBw1Ho=
 github.com/prometheus/client_model v0.6.1 h1:ZKSh/rekM+n3CeS952MLRAdFwIKqeY8b62p8ais2e9E=
 github.com/prometheus/client_model v0.6.1/go.mod h1:OrxVMOVHjw3lKMa8+x6HeMGkHMQyHDk9E3jmP2AmGiY=
-github.com/prometheus/common v0.48.0 h1:QO8U2CdOzSn1BBsmXJXduaaW+dY/5QLjfB8svtSzKKE=
+github.com/prometheus/common v0.54.0 h1:ZlZy0BgJhTwVZUn7dLOkwCZHUkrAqd3WYtcFCWnM1D8=
-github.com/prometheus/common v0.48.0/go.mod h1:0/KsvlIEfPQCQ5I2iNSAWKPZziNCvRs5EC6ILDTlAPc=
+github.com/prometheus/common v0.54.0/go.mod h1:/TQgMJP5CuVYveyT7n/0Ix8yLNNXy9yRSkhnLTHPDIQ=
 github.com/prometheus/procfs v0.15.1 h1:YagwOFzUgYfKKHX6Dr+sHT7km/hxC76UB0learggepc=
 github.com/prometheus/procfs v0.15.1/go.mod h1:fB45yRUv8NstnjriLhBQLuOUt+WW4BsoGhij/e3PBqk=
 github.com/redis/go-redis/v9 v9.5.1 h1:H1X4D3yHPaYrkL5X06Wh6xNVM/pX0Ft4RV0vMGvLBh8=

vendor/github.com/prometheus/common/expfmt/decode.go

@@ -75,14 +75,14 @@ func ResponseFormat(h http.Header) Format {
 func NewDecoder(r io.Reader, format Format) Decoder {
 	switch format.FormatType() {
 	case TypeProtoDelim:
-		return &protoDecoder{r: r}
+		return &protoDecoder{r: bufio.NewReader(r)}
 	}
 	return &textDecoder{r: r}
 }
 
 // protoDecoder implements the Decoder interface for protocol buffers.
 type protoDecoder struct {
-	r io.Reader
+	r protodelim.Reader
 }
 
 // Decode implements the Decoder interface.
@@ -90,7 +90,7 @@ func (d *protoDecoder) Decode(v *dto.MetricFamily) error {
 	opts := protodelim.UnmarshalOptions{
 		MaxSize: -1,
 	}
-	if err := opts.UnmarshalFrom(bufio.NewReader(d.r), v); err != nil {
+	if err := opts.UnmarshalFrom(d.r, v); err != nil {
 		return err
 	}
 	if !model.IsValidMetricName(model.LabelValue(v.GetName())) {

vendor/github.com/prometheus/common/expfmt/encode.go

@@ -139,7 +139,13 @@ func NegotiateIncludingOpenMetrics(h http.Header) Format {
 // interface is kept for backwards compatibility.
 // In cases where the Format does not allow for UTF-8 names, the global
 // NameEscapingScheme will be applied.
-func NewEncoder(w io.Writer, format Format) Encoder {
+//
+// NewEncoder can be called with additional options to customize the OpenMetrics text output.
+// For example:
+// NewEncoder(w, FmtOpenMetrics_1_0_0, WithCreatedLines())
+//
+// Extra options are ignored for all other formats.
+func NewEncoder(w io.Writer, format Format, options ...EncoderOption) Encoder {
 	escapingScheme := format.ToEscapingScheme()
 
 	switch format.FormatType() {
@@ -178,7 +184,7 @@ func NewEncoder(w io.Writer, format Format) Encoder {
 	case TypeOpenMetrics:
 		return encoderCloser{
 			encode: func(v *dto.MetricFamily) error {
-				_, err := MetricFamilyToOpenMetrics(w, model.EscapeMetricFamily(v, escapingScheme))
+				_, err := MetricFamilyToOpenMetrics(w, model.EscapeMetricFamily(v, escapingScheme), options...)
 				return err
 			},
 			close: func() error {

vendor/github.com/prometheus/common/expfmt/expfmt.go

@@ -15,6 +15,7 @@
 package expfmt
 
 import (
+	"fmt"
 	"strings"
 
 	"github.com/prometheus/common/model"
@@ -63,7 +64,7 @@ const (
 type FormatType int
 
 const (
-	TypeUnknown = iota
+	TypeUnknown FormatType = iota
 	TypeProtoCompact
 	TypeProtoDelim
 	TypeProtoText
@@ -73,7 +74,8 @@ const (
 
 // NewFormat generates a new Format from the type provided. Mostly used for
 // tests, most Formats should be generated as part of content negotiation in
-// encode.go.
+// encode.go. If a type has more than one version, the latest version will be
+// returned.
 func NewFormat(t FormatType) Format {
 	switch t {
 	case TypeProtoCompact:
@@ -91,13 +93,21 @@ func NewFormat(t FormatType) Format {
 	}
 }
 
+// NewOpenMetricsFormat generates a new OpenMetrics format matching the
+// specified version number.
+func NewOpenMetricsFormat(version string) (Format, error) {
+	if version == OpenMetricsVersion_0_0_1 {
+		return fmtOpenMetrics_0_0_1, nil
+	}
+	if version == OpenMetricsVersion_1_0_0 {
+		return fmtOpenMetrics_1_0_0, nil
+	}
+	return fmtUnknown, fmt.Errorf("unknown open metrics version string")
+}
+
 // FormatType deduces an overall FormatType for the given format.
 func (f Format) FormatType() FormatType {
 	toks := strings.Split(string(f), ";")
-	if len(toks) < 2 {
-		return TypeUnknown
-	}
-
 	params := make(map[string]string)
 	for i, t := range toks {
 		if i == 0 {

vendor/github.com/prometheus/common/expfmt/openmetrics_create.go

@@ -22,11 +22,47 @@ import (
 	"strconv"
 	"strings"
 
+	"google.golang.org/protobuf/types/known/timestamppb"
+
 	"github.com/prometheus/common/model"
 
 	dto "github.com/prometheus/client_model/go"
 )
 
+type encoderOption struct {
+	withCreatedLines bool
+	withUnit         bool
+}
+
+type EncoderOption func(*encoderOption)
+
+// WithCreatedLines is an EncoderOption that configures the OpenMetrics encoder
+// to include _created lines (See
+// https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#counter-1).
+// Created timestamps can improve the accuracy of series reset detection, but
+// come with a bandwidth cost.
+//
+// At the time of writing, created timestamp ingestion is still experimental in
+// Prometheus and need to be enabled with the feature-flag
+// `--feature-flag=created-timestamp-zero-ingestion`, and breaking changes are
+// still possible. Therefore, it is recommended to use this feature with caution.
+func WithCreatedLines() EncoderOption {
+	return func(t *encoderOption) {
+		t.withCreatedLines = true
+	}
+}
+
+// WithUnit is an EncoderOption enabling a set unit to be written to the output
+// and to be added to the metric name, if it's not there already, as a suffix.
+// Without opting in this way, the unit will not be added to the metric name and,
+// on top of that, the unit will not be passed onto the output, even if it
+// were declared in the *dto.MetricFamily struct, i.e. even if in.Unit !=nil.
+func WithUnit() EncoderOption {
+	return func(t *encoderOption) {
+		t.withUnit = true
+	}
+}
+
 // MetricFamilyToOpenMetrics converts a MetricFamily proto message into the
 // OpenMetrics text format and writes the resulting lines to 'out'. It returns
 // the number of bytes written and any error encountered. The output will have
@@ -59,20 +95,34 @@ import (
 // Prometheus to OpenMetrics or vice versa:
 //
 //   - Counters are expected to have the `_total` suffix in their metric name. In
-//     the output, the suffix will be truncated from the `# TYPE` and `# HELP`
+//     the output, the suffix will be truncated from the `# TYPE`, `# HELP` and `# UNIT`
-//     line. A counter with a missing `_total` suffix is not an error. However,
+//     lines. A counter with a missing `_total` suffix is not an error. However,
 //     its type will be set to `unknown` in that case to avoid invalid OpenMetrics
 //     output.
 //
-//   - No support for the following (optional) features: `# UNIT` line, `_created`
+//   - According to the OM specs, the `# UNIT` line is optional, but if populated,
-//     line, info type, stateset type, gaugehistogram type.
+//     the unit has to be present in the metric name as its suffix:
+//     (see https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#unit).
+//     However, in order to accommodate any potential scenario where such a change in the
+//     metric name is not desirable, the users are here given the choice of either explicitly
+//     opt in, in case they wish for the unit to be included in the output AND in the metric name
+//     as a suffix (see the description of the WithUnit function above),
+//     or not to opt in, in case they don't want for any of that to happen.
+//
+//   - No support for the following (optional) features: info type,
+//     stateset type, gaugehistogram type.
 //
 //   - The size of exemplar labels is not checked (i.e. it's possible to create
 //     exemplars that are larger than allowed by the OpenMetrics specification).
 //
 //   - The value of Counters is not checked. (OpenMetrics doesn't allow counters
 //     with a `NaN` value.)
-func MetricFamilyToOpenMetrics(out io.Writer, in *dto.MetricFamily) (written int, err error) {
+func MetricFamilyToOpenMetrics(out io.Writer, in *dto.MetricFamily, options ...EncoderOption) (written int, err error) {
+	toOM := encoderOption{}
+	for _, option := range options {
+		option(&toOM)
+	}
+
 	name := in.GetName()
 	if name == "" {
 		return 0, fmt.Errorf("MetricFamily has no name: %s", in)
@@ -97,10 +147,13 @@ func MetricFamilyToOpenMetrics(out io.Writer, in *dto.MetricFamily) (written int
 	var (
 		n             int
 		metricType    = in.GetType()
-		shortName  = name
+		compliantName = name
 	)
-	if metricType == dto.MetricType_COUNTER && strings.HasSuffix(shortName, "_total") {
+	if metricType == dto.MetricType_COUNTER && strings.HasSuffix(compliantName, "_total") {
-		shortName = name[:len(name)-6]
+		compliantName = name[:len(name)-6]
+	}
+	if toOM.withUnit && in.Unit != nil && !strings.HasSuffix(compliantName, fmt.Sprintf("_%s", *in.Unit)) {
+		compliantName = compliantName + fmt.Sprintf("_%s", *in.Unit)
 	}
 
 	// Comments, first HELP, then TYPE.
@@ -110,7 +163,7 @@ func MetricFamilyToOpenMetrics(out io.Writer, in *dto.MetricFamily) (written int
 		if err != nil {
 			return
 		}
-		n, err = writeName(w, shortName)
+		n, err = writeName(w, compliantName)
 		written += n
 		if err != nil {
 			return
@@ -136,7 +189,7 @@ func MetricFamilyToOpenMetrics(out io.Writer, in *dto.MetricFamily) (written int
 	if err != nil {
 		return
 	}
-	n, err = writeName(w, shortName)
+	n, err = writeName(w, compliantName)
 	written += n
 	if err != nil {
 		return
@@ -163,55 +216,89 @@ func MetricFamilyToOpenMetrics(out io.Writer, in *dto.MetricFamily) (written int
 	if err != nil {
 		return
 	}
+	if toOM.withUnit && in.Unit != nil {
+		n, err = w.WriteString("# UNIT ")
+		written += n
+		if err != nil {
+			return
+		}
+		n, err = writeName(w, compliantName)
+		written += n
+		if err != nil {
+			return
+		}
+
+		err = w.WriteByte(' ')
+		written++
+		if err != nil {
+			return
+		}
+		n, err = writeEscapedString(w, *in.Unit, true)
+		written += n
+		if err != nil {
+			return
+		}
+		err = w.WriteByte('\n')
+		written++
+		if err != nil {
+			return
+		}
+	}
+
+	var createdTsBytesWritten int
 
 	// Finally the samples, one line for each.
+	if metricType == dto.MetricType_COUNTER && strings.HasSuffix(name, "_total") {
+		compliantName = compliantName + "_total"
+	}
 	for _, metric := range in.Metric {
 		switch metricType {
 		case dto.MetricType_COUNTER:
 			if metric.Counter == nil {
 				return written, fmt.Errorf(
-					"expected counter in metric %s %s", name, metric,
+					"expected counter in metric %s %s", compliantName, metric,
 				)
 			}
-			// Note that we have ensured above that either the name
-			// ends on `_total` or that the rendered type is
-			// `unknown`. Therefore, no `_total` must be added here.
 			n, err = writeOpenMetricsSample(
-				w, name, "", metric, "", 0,
+				w, compliantName, "", metric, "", 0,
 				metric.Counter.GetValue(), 0, false,
 				metric.Counter.Exemplar,
 			)
+			if toOM.withCreatedLines && metric.Counter.CreatedTimestamp != nil {
+				createdTsBytesWritten, err = writeOpenMetricsCreated(w, compliantName, "_total", metric, "", 0, metric.Counter.GetCreatedTimestamp())
+				n += createdTsBytesWritten
+			}
 		case dto.MetricType_GAUGE:
 			if metric.Gauge == nil {
 				return written, fmt.Errorf(
-					"expected gauge in metric %s %s", name, metric,
+					"expected gauge in metric %s %s", compliantName, metric,
 				)
 			}
 			n, err = writeOpenMetricsSample(
-				w, name, "", metric, "", 0,
+				w, compliantName, "", metric, "", 0,
 				metric.Gauge.GetValue(), 0, false,
 				nil,
 			)
 		case dto.MetricType_UNTYPED:
 			if metric.Untyped == nil {
 				return written, fmt.Errorf(
-					"expected untyped in metric %s %s", name, metric,
+					"expected untyped in metric %s %s", compliantName, metric,
 				)
 			}
 			n, err = writeOpenMetricsSample(
-				w, name, "", metric, "", 0,
+				w, compliantName, "", metric, "", 0,
 				metric.Untyped.GetValue(), 0, false,
 				nil,
 			)
 		case dto.MetricType_SUMMARY:
 			if metric.Summary == nil {
 				return written, fmt.Errorf(
-					"expected summary in metric %s %s", name, metric,
+					"expected summary in metric %s %s", compliantName, metric,
 				)
 			}
 			for _, q := range metric.Summary.Quantile {
 				n, err = writeOpenMetricsSample(
-					w, name, "", metric,
+					w, compliantName, "", metric,
 					model.QuantileLabel, q.GetQuantile(),
 					q.GetValue(), 0, false,
 					nil,
@@ -222,7 +309,7 @@ func MetricFamilyToOpenMetrics(out io.Writer, in *dto.MetricFamily) (written int
 				}
 			}
 			n, err = writeOpenMetricsSample(
-				w, name, "_sum", metric, "", 0,
+				w, compliantName, "_sum", metric, "", 0,
 				metric.Summary.GetSampleSum(), 0, false,
 				nil,
 			)
@@ -231,20 +318,24 @@ func MetricFamilyToOpenMetrics(out io.Writer, in *dto.MetricFamily) (written int
 				return
 			}
 			n, err = writeOpenMetricsSample(
-				w, name, "_count", metric, "", 0,
+				w, compliantName, "_count", metric, "", 0,
 				0, metric.Summary.GetSampleCount(), true,
 				nil,
 			)
+			if toOM.withCreatedLines && metric.Summary.CreatedTimestamp != nil {
+				createdTsBytesWritten, err = writeOpenMetricsCreated(w, compliantName, "", metric, "", 0, metric.Summary.GetCreatedTimestamp())
+				n += createdTsBytesWritten
+			}
 		case dto.MetricType_HISTOGRAM:
 			if metric.Histogram == nil {
 				return written, fmt.Errorf(
-					"expected histogram in metric %s %s", name, metric,
+					"expected histogram in metric %s %s", compliantName, metric,
 				)
 			}
 			infSeen := false
 			for _, b := range metric.Histogram.Bucket {
 				n, err = writeOpenMetricsSample(
-					w, name, "_bucket", metric,
+					w, compliantName, "_bucket", metric,
 					model.BucketLabel, b.GetUpperBound(),
 					0, b.GetCumulativeCount(), true,
 					b.Exemplar,
@@ -259,7 +350,7 @@ func MetricFamilyToOpenMetrics(out io.Writer, in *dto.MetricFamily) (written int
 			}
 			if !infSeen {
 				n, err = writeOpenMetricsSample(
-					w, name, "_bucket", metric,
+					w, compliantName, "_bucket", metric,
 					model.BucketLabel, math.Inf(+1),
 					0, metric.Histogram.GetSampleCount(), true,
 					nil,
@@ -270,7 +361,7 @@ func MetricFamilyToOpenMetrics(out io.Writer, in *dto.MetricFamily) (written int
 				}
 			}
 			n, err = writeOpenMetricsSample(
-				w, name, "_sum", metric, "", 0,
+				w, compliantName, "_sum", metric, "", 0,
 				metric.Histogram.GetSampleSum(), 0, false,
 				nil,
 			)
@@ -279,13 +370,17 @@ func MetricFamilyToOpenMetrics(out io.Writer, in *dto.MetricFamily) (written int
 				return
 			}
 			n, err = writeOpenMetricsSample(
-				w, name, "_count", metric, "", 0,
+				w, compliantName, "_count", metric, "", 0,
 				0, metric.Histogram.GetSampleCount(), true,
 				nil,
 			)
+			if toOM.withCreatedLines && metric.Histogram.CreatedTimestamp != nil {
+				createdTsBytesWritten, err = writeOpenMetricsCreated(w, compliantName, "", metric, "", 0, metric.Histogram.GetCreatedTimestamp())
+				n += createdTsBytesWritten
+			}
 		default:
 			return written, fmt.Errorf(
-				"unexpected type in metric %s %s", name, metric,
+				"unexpected type in metric %s %s", compliantName, metric,
 			)
 		}
 		written += n
@@ -350,7 +445,7 @@ func writeOpenMetricsSample(
 			return written, err
 		}
 	}
-	if exemplar != nil {
+	if exemplar != nil && len(exemplar.Label) > 0 {
 		n, err = writeExemplar(w, exemplar)
 		written += n
 		if err != nil {
@@ -473,6 +568,49 @@ func writeOpenMetricsNameAndLabelPairs(
 	return written, nil
 }
 
+// writeOpenMetricsCreated writes the created timestamp for a single time series
+// following OpenMetrics text format to w, given the metric name, the metric proto
+// message itself, optionally a suffix to be removed, e.g. '_total' for counters,
+// an additional label name with a float64 value (use empty string as label name if
+// not required) and the timestamp that represents the created timestamp.
+// The function returns the number of bytes written and any error encountered.
+func writeOpenMetricsCreated(w enhancedWriter,
+	name, suffixToTrim string, metric *dto.Metric,
+	additionalLabelName string, additionalLabelValue float64,
+	createdTimestamp *timestamppb.Timestamp,
+) (int, error) {
+	written := 0
+	n, err := writeOpenMetricsNameAndLabelPairs(
+		w, strings.TrimSuffix(name, suffixToTrim)+"_created", metric.Label, additionalLabelName, additionalLabelValue,
+	)
+	written += n
+	if err != nil {
+		return written, err
+	}
+
+	err = w.WriteByte(' ')
+	written++
+	if err != nil {
+		return written, err
+	}
+
+	// TODO(beorn7): Format this directly from components of ts to
+	// avoid overflow/underflow and precision issues of the float
+	// conversion.
+	n, err = writeOpenMetricsFloat(w, float64(createdTimestamp.AsTime().UnixNano())/1e9)
+	written += n
+	if err != nil {
+		return written, err
+	}
+
+	err = w.WriteByte('\n')
+	written++
+	if err != nil {
+		return written, err
+	}
+	return written, nil
+}
+
 // writeExemplar writes the provided exemplar in OpenMetrics format to w. The
 // function returns the number of bytes written and any error encountered.
 func writeExemplar(w enhancedWriter, e *dto.Exemplar) (int, error) {

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

@@ -75,7 +75,12 @@ func (a *Alert) ResolvedAt(ts time.Time) bool {
 
 // Status returns the status of the alert.
 func (a *Alert) Status() AlertStatus {
-	if a.Resolved() {
+	return a.StatusAt(time.Now())
+}
+
+// StatusAt returns the status of the alert at the given timestamp.
+func (a *Alert) StatusAt(ts time.Time) AlertStatus {
+	if a.ResolvedAt(ts) {
 		return AlertResolved
 	}
 	return AlertFiring
@@ -127,6 +132,17 @@ func (as Alerts) HasFiring() bool {
 	return false
 }
 
+// HasFiringAt returns true iff one of the alerts is not resolved
+// at the time ts.
+func (as Alerts) HasFiringAt(ts time.Time) bool {
+	for _, a := range as {
+		if !a.ResolvedAt(ts) {
+			return true
+		}
+	}
+	return false
+}
+
 // Status returns StatusFiring iff at least one of the alerts is firing.
 func (as Alerts) Status() AlertStatus {
 	if as.HasFiring() {
@@ -134,3 +150,12 @@ func (as Alerts) Status() AlertStatus {
 	}
 	return AlertResolved
 }
+
+// StatusAt returns StatusFiring iff at least one of the alerts is firing
+// at the time ts.
+func (as Alerts) StatusAt(ts time.Time) AlertStatus {
+	if as.HasFiringAt(ts) {
+		return AlertFiring
+	}
+	return AlertResolved
+}

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

@@ -17,7 +17,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"sort"
-	"strings"
 )
 
 // A LabelSet is a collection of LabelName and LabelValue pairs.  The LabelSet
@@ -129,16 +128,6 @@ func (l LabelSet) Merge(other LabelSet) LabelSet {
 	return result
 }
 
-func (l LabelSet) String() string {
-	lstrs := make([]string, 0, len(l))
-	for l, v := range l {
-		lstrs = append(lstrs, fmt.Sprintf("%s=%q", l, v))
-	}
-
-	sort.Strings(lstrs)
-	return fmt.Sprintf("{%s}", strings.Join(lstrs, ", "))
-}
-
 // Fingerprint returns the LabelSet's fingerprint.
 func (ls LabelSet) Fingerprint() Fingerprint {
 	return labelSetToFingerprint(ls)

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

@@ -0,0 +1,45 @@
+// Copyright 2024 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.
+
+//go:build go1.21
+
+package model
+
+import (
+	"bytes"
+	"slices"
+	"strconv"
+)
+
+// String will look like `{foo="bar", more="less"}`. Names are sorted alphabetically.
+func (l LabelSet) String() string {
+	var lna [32]string // On stack to avoid memory allocation for sorting names.
+	labelNames := lna[:0]
+	for name := range l {
+		labelNames = append(labelNames, string(name))
+	}
+	slices.Sort(labelNames)
+	var bytea [1024]byte // On stack to avoid memory allocation while building the output.
+	b := bytes.NewBuffer(bytea[:0])
+	b.WriteByte('{')
+	for i, name := range labelNames {
+		if i > 0 {
+			b.WriteString(", ")
+		}
+		b.WriteString(name)
+		b.WriteByte('=')
+		b.Write(strconv.AppendQuote(b.AvailableBuffer(), string(l[LabelName(name)])))
+	}
+	b.WriteByte('}')
+	return b.String()
+}

vendor/github.com/prometheus/common/model/labelset_string_go120.go

@@ -0,0 +1,39 @@
+// Copyright 2024 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.
+
+//go:build !go1.21
+
+package model
+
+import (
+	"fmt"
+	"sort"
+	"strings"
+)
+
+// String was optimized using functions not available for go 1.20
+// or lower. We keep the old implementation for compatibility with client_golang.
+// Once client golang drops support for go 1.20 (scheduled for August 2024), this
+// file can be removed.
+func (l LabelSet) String() string {
+	labelNames := make([]string, 0, len(l))
+	for name := range l {
+		labelNames = append(labelNames, string(name))
+	}
+	sort.Strings(labelNames)
+	lstrs := make([]string, 0, len(l))
+	for _, name := range labelNames {
+		lstrs = append(lstrs, fmt.Sprintf("%s=%q", name, l[LabelName(name)]))
+	}
+	return fmt.Sprintf("{%s}", strings.Join(lstrs, ", "))
+}

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

@@ -204,6 +204,7 @@ func EscapeMetricFamily(v *dto.MetricFamily, scheme EscapingScheme) *dto.MetricF
 	out := &dto.MetricFamily{
 		Help: v.Help,
 		Type: v.Type,
+		Unit: v.Unit,
 	}
 
 	// If the name is nil, copy as-is, don't try to escape.

vendor/modules.txt

@@ -181,7 +181,7 @@ github.com/prometheus/client_golang/prometheus/internal
 # github.com/prometheus/client_model v0.6.1
 ## explicit; go 1.19
 github.com/prometheus/client_model/go
-# github.com/prometheus/common v0.48.0
+# github.com/prometheus/common v0.54.0
 ## explicit; go 1.20
 github.com/prometheus/common/expfmt
 github.com/prometheus/common/internal/bitbucket.org/ww/goautoneg