Vendor: update armon/go-metrics to v0.3.3

To pick up a lock contention fix in prometheus sink: https://github.com/armon/go-metrics/pull/107 .
2026-01-04 17:35:43 +03:00 · 2020-04-25 12:32:16 -04:00
parent 838b16d43d
commit 69a9d3c507
8 changed files with 660 additions and 95 deletions
--- a/vendor/github.com/armon/go-metrics/go.mod
+++ b/vendor/github.com/armon/go-metrics/go.mod
@@ -3,14 +3,15 @@ module github.com/armon/go-metrics
 go 1.12

 require (
-	github.com/DataDog/datadog-go v2.2.0+incompatible
+	github.com/DataDog/datadog-go v3.2.0+incompatible
 	github.com/circonus-labs/circonus-gometrics v2.3.1+incompatible
 	github.com/circonus-labs/circonusllhist v0.1.3 // indirect
+	github.com/golang/protobuf v1.3.2
 	github.com/hashicorp/go-immutable-radix v1.0.0
 	github.com/hashicorp/go-retryablehttp v0.5.3 // indirect
 	github.com/pascaldekloe/goe v0.1.0
-	github.com/pkg/errors v0.8.1 // indirect
-	github.com/prometheus/client_golang v0.9.2
-	github.com/stretchr/testify v1.3.0 // indirect
+	github.com/prometheus/client_golang v1.4.0
+	github.com/prometheus/client_model v0.2.0
+	github.com/prometheus/common v0.9.1
 	github.com/tv42/httpunix v0.0.0-20150427012821-b75d8614f926 // indirect
 )
--- a/vendor/github.com/armon/go-metrics/go.sum
+++ b/vendor/github.com/armon/go-metrics/go.sum
@@ -1,15 +1,39 @@
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@@ -20,27 +44,82 @@ github.com/hashicorp/go-uuid v1.0.0 h1:RS8zrF7PhGwyNPOtxSClXXj9HA8feRnJzgnI1RJCS
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+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.5 h1:ymVxjfMaHvXD8RqPRmzHHsB3VvucivSkIAvJFDI5O3c=
+gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
--- a/vendor/github.com/armon/go-metrics/inmem.go
+++ b/vendor/github.com/armon/go-metrics/inmem.go
@@ -10,6 +10,8 @@ import (
 	"time"
 )

+var spaceReplacer = strings.NewReplacer(" ", "_")
+
 // InmemSink provides a MetricSink that does in-memory aggregation
 // without sending metrics over a network. It can be embedded within
 // an application to provide profiling information.
@@ -312,36 +314,21 @@ func (i *InmemSink) getInterval() *IntervalMetrics {
 // Flattens the key for formatting, removes spaces
 func (i *InmemSink) flattenKey(parts []string) string {
 	buf := &bytes.Buffer{}
-	replacer := strings.NewReplacer(" ", "_")

-	if len(parts) > 0 {
-		replacer.WriteString(buf, parts[0])
-	}
-	for _, part := range parts[1:] {
-		replacer.WriteString(buf, ".")
-		replacer.WriteString(buf, part)
-	}
+	joined := strings.Join(parts, ".")
+
+	spaceReplacer.WriteString(buf, joined)

 	return buf.String()
 }

 // Flattens the key for formatting along with its labels, removes spaces
 func (i *InmemSink) flattenKeyLabels(parts []string, labels []Label) (string, string) {
-	buf := &bytes.Buffer{}
-	replacer := strings.NewReplacer(" ", "_")
-
-	if len(parts) > 0 {
-		replacer.WriteString(buf, parts[0])
-	}
-	for _, part := range parts[1:] {
-		replacer.WriteString(buf, ".")
-		replacer.WriteString(buf, part)
-	}
-
-	key := buf.String()
+	key := i.flattenKey(parts)
+	buf := bytes.NewBufferString(key)

 	for _, label := range labels {
-		replacer.WriteString(buf, fmt.Sprintf(";%s=%s", label.Name, label.Value))
+		spaceReplacer.WriteString(buf, fmt.Sprintf(";%s=%s", label.Name, label.Value))
 	}

 	return buf.String(), key
--- a/vendor/github.com/armon/go-metrics/metrics.go
+++ b/vendor/github.com/armon/go-metrics/metrics.go
@@ -269,10 +269,25 @@ func (m *Metrics) emitRuntimeStats() {
 	m.lastNumGC = num
 }

-// Inserts a string value at an index into the slice
+// Creates a new slice with the provided string value as the first element
+// and the provided slice values as the remaining values.
+// Ordering of the values in the provided input slice is kept in tact in the output slice.
 func insert(i int, v string, s []string) []string {
-	s = append(s, "")
-	copy(s[i+1:], s[i:])
-	s[i] = v
-	return s
+	// Allocate new slice to avoid modifying the input slice
+	newS := make([]string, len(s)+1)
+
+	// Copy s[0, i-1] into newS
+	for j := 0; j < i; j++ {
+		newS[j] = s[j]
+	}
+
+	// Insert provided element at index i
+	newS[i] = v
+
+	// Copy s[i, len(s)-1] into newS starting at newS[i+1]
+	for j := i; j < len(s); j++ {
+		newS[j+1] = s[j]
+	}
+
+	return newS
 }
--- a/vendor/github.com/armon/go-metrics/prometheus/prometheus.go
+++ b/vendor/github.com/armon/go-metrics/prometheus/prometheus.go
@@ -1,9 +1,10 @@
-// +build go1.3
+// +build go1.9

 package prometheus

 import (
 	"fmt"
+	"log"
 	"strings"
 	"sync"
 	"time"
@@ -12,6 +13,7 @@ import (

 	"github.com/armon/go-metrics"
 	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/push"
 )

 var (
@@ -30,11 +32,11 @@ type PrometheusOpts struct {
 }

 type PrometheusSink struct {
-	mu         sync.Mutex
-	gauges     map[string]prometheus.Gauge
-	summaries  map[string]prometheus.Summary
-	counters   map[string]prometheus.Counter
-	updates    map[string]time.Time
+	// If these will ever be copied, they should be converted to *sync.Map values and initialized appropriately
+	gauges     sync.Map
+	summaries  sync.Map
+	counters   sync.Map
+	updates    sync.Map
 	expiration time.Duration
 }

@@ -46,10 +48,10 @@ func NewPrometheusSink() (*PrometheusSink, error) {
 // NewPrometheusSinkFrom creates a new PrometheusSink using the passed options.
 func NewPrometheusSinkFrom(opts PrometheusOpts) (*PrometheusSink, error) {
 	sink := &PrometheusSink{
-		gauges:     make(map[string]prometheus.Gauge),
-		summaries:  make(map[string]prometheus.Summary),
-		counters:   make(map[string]prometheus.Counter),
-		updates:    make(map[string]time.Time),
+		gauges:     sync.Map{},
+		summaries:  sync.Map{},
+		counters:   sync.Map{},
+		updates:    sync.Map{},
 		expiration: opts.Expiration,
 	}

@@ -67,38 +69,38 @@ func (p *PrometheusSink) Describe(c chan<- *prometheus.Desc) {
 // logic to clean up ephemeral metrics if their value haven't been set for a
 // duration exceeding our allowed expiration time.
 func (p *PrometheusSink) Collect(c chan<- prometheus.Metric) {
-	p.mu.Lock()
-	defer p.mu.Unlock()
-
 	expire := p.expiration != 0
 	now := time.Now()
-	for k, v := range p.gauges {
-		last := p.updates[k]
-		if expire && last.Add(p.expiration).Before(now) {
-			delete(p.updates, k)
-			delete(p.gauges, k)
+	p.gauges.Range(func(k, v interface{}) bool {
+		last, _ := p.updates.Load(k)
+		if expire && last.(time.Time).Add(p.expiration).Before(now) {
+			p.updates.Delete(k)
+			p.gauges.Delete(k)
 		} else {
-			v.Collect(c)
+			v.(prometheus.Gauge).Collect(c)
 		}
-	}
-	for k, v := range p.summaries {
-		last := p.updates[k]
-		if expire && last.Add(p.expiration).Before(now) {
-			delete(p.updates, k)
-			delete(p.summaries, k)
+		return true
+	})
+	p.summaries.Range(func(k, v interface{}) bool {
+		last, _ := p.updates.Load(k)
+		if expire && last.(time.Time).Add(p.expiration).Before(now) {
+			p.updates.Delete(k)
+			p.summaries.Delete(k)
 		} else {
-			v.Collect(c)
+			v.(prometheus.Summary).Collect(c)
 		}
-	}
-	for k, v := range p.counters {
-		last := p.updates[k]
-		if expire && last.Add(p.expiration).Before(now) {
-			delete(p.updates, k)
-			delete(p.counters, k)
+		return true
+	})
+	p.counters.Range(func(k, v interface{}) bool {
+		last, _ := p.updates.Load(k)
+		if expire && last.(time.Time).Add(p.expiration).Before(now) {
+			p.updates.Delete(k)
+			p.counters.Delete(k)
 		} else {
-			v.Collect(c)
+			v.(prometheus.Counter).Collect(c)
 		}
-	}
+		return true
+	})
 }

 var forbiddenChars = regexp.MustCompile("[ .=\\-/]")
@@ -128,20 +130,18 @@ func (p *PrometheusSink) SetGauge(parts []string, val float32) {
 }

 func (p *PrometheusSink) SetGaugeWithLabels(parts []string, val float32, labels []metrics.Label) {
-	p.mu.Lock()
-	defer p.mu.Unlock()
 	key, hash := p.flattenKey(parts, labels)
-	g, ok := p.gauges[hash]
+	g, ok := p.gauges.Load(hash)
 	if !ok {
 		g = prometheus.NewGauge(prometheus.GaugeOpts{
 			Name:        key,
 			Help:        key,
 			ConstLabels: prometheusLabels(labels),
 		})
-		p.gauges[hash] = g
+		p.gauges.Store(hash, g)
 	}
-	g.Set(float64(val))
-	p.updates[hash] = time.Now()
+	g.(prometheus.Gauge).Set(float64(val))
+	p.updates.Store(hash, time.Now())
 }

 func (p *PrometheusSink) AddSample(parts []string, val float32) {
@@ -149,21 +149,20 @@ func (p *PrometheusSink) AddSample(parts []string, val float32) {
 }

 func (p *PrometheusSink) AddSampleWithLabels(parts []string, val float32, labels []metrics.Label) {
-	p.mu.Lock()
-	defer p.mu.Unlock()
 	key, hash := p.flattenKey(parts, labels)
-	g, ok := p.summaries[hash]
+	g, ok := p.summaries.Load(hash)
 	if !ok {
 		g = prometheus.NewSummary(prometheus.SummaryOpts{
 			Name:        key,
 			Help:        key,
 			MaxAge:      10 * time.Second,
 			ConstLabels: prometheusLabels(labels),
+			Objectives:  map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
 		})
-		p.summaries[hash] = g
+		p.summaries.Store(hash, g)
 	}
-	g.Observe(float64(val))
-	p.updates[hash] = time.Now()
+	g.(prometheus.Summary).Observe(float64(val))
+	p.updates.Store(hash, time.Now())
 }

 // EmitKey is not implemented. Prometheus doesn’t offer a type for which an
@@ -177,18 +176,71 @@ func (p *PrometheusSink) IncrCounter(parts []string, val float32) {
 }

 func (p *PrometheusSink) IncrCounterWithLabels(parts []string, val float32, labels []metrics.Label) {
-	p.mu.Lock()
-	defer p.mu.Unlock()
 	key, hash := p.flattenKey(parts, labels)
-	g, ok := p.counters[hash]
+	g, ok := p.counters.Load(hash)
 	if !ok {
 		g = prometheus.NewCounter(prometheus.CounterOpts{
 			Name:        key,
 			Help:        key,
 			ConstLabels: prometheusLabels(labels),
 		})
-		p.counters[hash] = g
+		p.counters.Store(hash, g)
 	}
-	g.Add(float64(val))
-	p.updates[hash] = time.Now()
+	g.(prometheus.Counter).Add(float64(val))
+	p.updates.Store(hash, time.Now())
+}
+
+type PrometheusPushSink struct {
+	*PrometheusSink
+	pusher       *push.Pusher
+	address      string
+	pushInterval time.Duration
+	stopChan     chan struct{}
+}
+
+func NewPrometheusPushSink(address string, pushIterval time.Duration, name string) (*PrometheusPushSink, error) {
+
+	promSink := &PrometheusSink{
+		gauges:     sync.Map{},
+		summaries:  sync.Map{},
+		counters:   sync.Map{},
+		updates:    sync.Map{},
+		expiration: 60 * time.Second,
+	}
+
+	pusher := push.New(address, name).Collector(promSink)
+
+	sink := &PrometheusPushSink{
+		promSink,
+		pusher,
+		address,
+		pushIterval,
+		make(chan struct{}),
+	}
+
+	sink.flushMetrics()
+	return sink, nil
+}
+
+func (s *PrometheusPushSink) flushMetrics() {
+	ticker := time.NewTicker(s.pushInterval)
+
+	go func() {
+		for {
+			select {
+			case <-ticker.C:
+				err := s.pusher.Push()
+				if err != nil {
+					log.Printf("[ERR] Error pushing to Prometheus! Err: %s", err)
+				}
+			case <-s.stopChan:
+				ticker.Stop()
+				return
+			}
+		}
+	}()
+}
+
+func (s *PrometheusPushSink) Shutdown() {
+	close(s.stopChan)
 }
--- a/vendor/github.com/prometheus/client_golang/prometheus/push/deprecated.go
+++ b/vendor/github.com/prometheus/client_golang/prometheus/push/deprecated.go
@@ -0,0 +1,172 @@
+// Copyright 2018 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 push
+
+// This file contains only deprecated code. Remove after v0.9 is released.
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"os"
+	"strings"
+
+	"github.com/prometheus/common/expfmt"
+	"github.com/prometheus/common/model"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+// FromGatherer triggers a metric collection by the provided Gatherer (which is
+// usually implemented by a prometheus.Registry) and pushes all gathered metrics
+// to the Pushgateway specified by url, using the provided job name and the
+// (optional) further grouping labels (the grouping map may be nil). See the
+// Pushgateway documentation for detailed implications of the job and other
+// grouping labels. Neither the job name nor any grouping label value may
+// contain a "/". The metrics pushed must not contain a job label of their own
+// nor any of the grouping labels.
+//
+// You can use just host:port or ip:port as url, in which case 'http://' is
+// added automatically. You can also include the schema in the URL. However, do
+// not include the '/metrics/jobs/...' part.
+//
+// Note that all previously pushed metrics with the same job and other grouping
+// labels will be replaced with the metrics pushed by this call. (It uses HTTP
+// method 'PUT' to push to the Pushgateway.)
+//
+// Deprecated: Please use a Pusher created with New instead.
+func FromGatherer(job string, grouping map[string]string, url string, g prometheus.Gatherer) error {
+	return push(job, grouping, url, g, "PUT")
+}
+
+// AddFromGatherer works like FromGatherer, but only previously pushed metrics
+// with the same name (and the same job and other grouping labels) will be
+// replaced. (It uses HTTP method 'POST' to push to the Pushgateway.)
+//
+// Deprecated: Please use a Pusher created with New instead.
+func AddFromGatherer(job string, grouping map[string]string, url string, g prometheus.Gatherer) error {
+	return push(job, grouping, url, g, "POST")
+}
+
+func push(job string, grouping map[string]string, pushURL string, g prometheus.Gatherer, method string) error {
+	if !strings.Contains(pushURL, "://") {
+		pushURL = "http://" + pushURL
+	}
+	if strings.HasSuffix(pushURL, "/") {
+		pushURL = pushURL[:len(pushURL)-1]
+	}
+
+	if strings.Contains(job, "/") {
+		return fmt.Errorf("job contains '/': %s", job)
+	}
+	urlComponents := []string{url.QueryEscape(job)}
+	for ln, lv := range grouping {
+		if !model.LabelName(ln).IsValid() {
+			return fmt.Errorf("grouping label has invalid name: %s", ln)
+		}
+		if strings.Contains(lv, "/") {
+			return fmt.Errorf("value of grouping label %s contains '/': %s", ln, lv)
+		}
+		urlComponents = append(urlComponents, ln, lv)
+	}
+	pushURL = fmt.Sprintf("%s/metrics/job/%s", pushURL, strings.Join(urlComponents, "/"))
+
+	mfs, err := g.Gather()
+	if err != nil {
+		return err
+	}
+	buf := &bytes.Buffer{}
+	enc := expfmt.NewEncoder(buf, expfmt.FmtProtoDelim)
+	// Check for pre-existing grouping labels:
+	for _, mf := range mfs {
+		for _, m := range mf.GetMetric() {
+			for _, l := range m.GetLabel() {
+				if l.GetName() == "job" {
+					return fmt.Errorf("pushed metric %s (%s) already contains a job label", mf.GetName(), m)
+				}
+				if _, ok := grouping[l.GetName()]; ok {
+					return fmt.Errorf(
+						"pushed metric %s (%s) already contains grouping label %s",
+						mf.GetName(), m, l.GetName(),
+					)
+				}
+			}
+		}
+		enc.Encode(mf)
+	}
+	req, err := http.NewRequest(method, pushURL, buf)
+	if err != nil {
+		return err
+	}
+	req.Header.Set(contentTypeHeader, string(expfmt.FmtProtoDelim))
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != 202 {
+		body, _ := ioutil.ReadAll(resp.Body) // Ignore any further error as this is for an error message only.
+		return fmt.Errorf("unexpected status code %d while pushing to %s: %s", resp.StatusCode, pushURL, body)
+	}
+	return nil
+}
+
+// Collectors works like FromGatherer, but it does not use a Gatherer. Instead,
+// it collects from the provided collectors directly. It is a convenient way to
+// push only a few metrics.
+//
+// Deprecated: Please use a Pusher created with New instead.
+func Collectors(job string, grouping map[string]string, url string, collectors ...prometheus.Collector) error {
+	return pushCollectors(job, grouping, url, "PUT", collectors...)
+}
+
+// AddCollectors works like AddFromGatherer, but it does not use a Gatherer.
+// Instead, it collects from the provided collectors directly. It is a
+// convenient way to push only a few metrics.
+//
+// Deprecated: Please use a Pusher created with New instead.
+func AddCollectors(job string, grouping map[string]string, url string, collectors ...prometheus.Collector) error {
+	return pushCollectors(job, grouping, url, "POST", collectors...)
+}
+
+func pushCollectors(job string, grouping map[string]string, url, method string, collectors ...prometheus.Collector) error {
+	r := prometheus.NewRegistry()
+	for _, collector := range collectors {
+		if err := r.Register(collector); err != nil {
+			return err
+		}
+	}
+	return push(job, grouping, url, r, method)
+}
+
+// HostnameGroupingKey returns a label map with the only entry
+// {instance="<hostname>"}. This can be conveniently used as the grouping
+// parameter if metrics should be pushed with the hostname as label. The
+// returned map is created upon each call so that the caller is free to add more
+// labels to the map.
+//
+// Deprecated: Usually, metrics pushed to the Pushgateway should not be
+// host-centric. (You would use https://github.com/prometheus/node_exporter in
+// that case.) If you have the need to add the hostname to the grouping key, you
+// are probably doing something wrong. See
+// https://prometheus.io/docs/practices/pushing/ for details.
+func HostnameGroupingKey() map[string]string {
+	hostname, err := os.Hostname()
+	if err != nil {
+		return map[string]string{"instance": "unknown"}
+	}
+	return map[string]string{"instance": hostname}
+}
--- a/vendor/github.com/prometheus/client_golang/prometheus/push/push.go
+++ b/vendor/github.com/prometheus/client_golang/prometheus/push/push.go
@@ -0,0 +1,258 @@
+// 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 push provides functions to push metrics to a Pushgateway. It uses a
+// builder approach. Create a Pusher with New and then add the various options
+// by using its methods, finally calling Add or Push, like this:
+//
+//    // Easy case:
+//    push.New("http://example.org/metrics", "my_job").Gatherer(myRegistry).Push()
+//
+//    // Complex case:
+//    push.New("http://example.org/metrics", "my_job").
+//        Collector(myCollector1).
+//        Collector(myCollector2).
+//        Grouping("zone", "xy").
+//        Client(&myHTTPClient).
+//        BasicAuth("top", "secret").
+//        Add()
+//
+// See the examples section for more detailed examples.
+//
+// See the documentation of the Pushgateway to understand the meaning of
+// the grouping key and the differences between Push and Add:
+// https://github.com/prometheus/pushgateway
+package push
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"github.com/prometheus/common/expfmt"
+	"github.com/prometheus/common/model"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+const contentTypeHeader = "Content-Type"
+
+// HTTPDoer is an interface for the one method of http.Client that is used by Pusher
+type HTTPDoer interface {
+	Do(*http.Request) (*http.Response, error)
+}
+
+// Pusher manages a push to the Pushgateway. Use New to create one, configure it
+// with its methods, and finally use the Add or Push method to push.
+type Pusher struct {
+	error error
+
+	url, job string
+	grouping map[string]string
+
+	gatherers  prometheus.Gatherers
+	registerer prometheus.Registerer
+
+	client             HTTPDoer
+	useBasicAuth       bool
+	username, password string
+
+	expfmt expfmt.Format
+}
+
+// New creates a new Pusher to push to the provided URL with the provided job
+// name. You can use just host:port or ip:port as url, in which case “http://”
+// is added automatically. Alternatively, include the schema in the
+// URL. However, do not include the “/metrics/jobs/…” part.
+//
+// Note that until https://github.com/prometheus/pushgateway/issues/97 is
+// resolved, a “/” character in the job name is prohibited.
+func New(url, job string) *Pusher {
+	var (
+		reg = prometheus.NewRegistry()
+		err error
+	)
+	if !strings.Contains(url, "://") {
+		url = "http://" + url
+	}
+	if strings.HasSuffix(url, "/") {
+		url = url[:len(url)-1]
+	}
+	if strings.Contains(job, "/") {
+		err = fmt.Errorf("job contains '/': %s", job)
+	}
+
+	return &Pusher{
+		error:      err,
+		url:        url,
+		job:        job,
+		grouping:   map[string]string{},
+		gatherers:  prometheus.Gatherers{reg},
+		registerer: reg,
+		client:     &http.Client{},
+		expfmt:     expfmt.FmtProtoDelim,
+	}
+}
+
+// Push collects/gathers all metrics from all Collectors and Gatherers added to
+// this Pusher. Then, it pushes them to the Pushgateway configured while
+// creating this Pusher, using the configured job name and any added grouping
+// labels as grouping key. All previously pushed metrics with the same job and
+// other grouping labels will be replaced with the metrics pushed by this
+// call. (It uses HTTP method “PUT” to push to the Pushgateway.)
+//
+// Push returns the first error encountered by any method call (including this
+// one) in the lifetime of the Pusher.
+func (p *Pusher) Push() error {
+	return p.push("PUT")
+}
+
+// Add works like push, but only previously pushed metrics with the same name
+// (and the same job and other grouping labels) will be replaced. (It uses HTTP
+// method “POST” to push to the Pushgateway.)
+func (p *Pusher) Add() error {
+	return p.push("POST")
+}
+
+// Gatherer adds a Gatherer to the Pusher, from which metrics will be gathered
+// to push them to the Pushgateway. The gathered metrics must not contain a job
+// label of their own.
+//
+// For convenience, this method returns a pointer to the Pusher itself.
+func (p *Pusher) Gatherer(g prometheus.Gatherer) *Pusher {
+	p.gatherers = append(p.gatherers, g)
+	return p
+}
+
+// Collector adds a Collector to the Pusher, from which metrics will be
+// collected to push them to the Pushgateway. The collected metrics must not
+// contain a job label of their own.
+//
+// For convenience, this method returns a pointer to the Pusher itself.
+func (p *Pusher) Collector(c prometheus.Collector) *Pusher {
+	if p.error == nil {
+		p.error = p.registerer.Register(c)
+	}
+	return p
+}
+
+// Grouping adds a label pair to the grouping key of the Pusher, replacing any
+// previously added label pair with the same label name. Note that setting any
+// labels in the grouping key that are already contained in the metrics to push
+// will lead to an error.
+//
+// For convenience, this method returns a pointer to the Pusher itself.
+//
+// Note that until https://github.com/prometheus/pushgateway/issues/97 is
+// resolved, this method does not allow a “/” character in the label value.
+func (p *Pusher) Grouping(name, value string) *Pusher {
+	if p.error == nil {
+		if !model.LabelName(name).IsValid() {
+			p.error = fmt.Errorf("grouping label has invalid name: %s", name)
+			return p
+		}
+		if strings.Contains(value, "/") {
+			p.error = fmt.Errorf("value of grouping label %s contains '/': %s", name, value)
+			return p
+		}
+		p.grouping[name] = value
+	}
+	return p
+}
+
+// Client sets a custom HTTP client for the Pusher. For convenience, this method
+// returns a pointer to the Pusher itself.
+// Pusher only needs one method of the custom HTTP client: Do(*http.Request).
+// Thus, rather than requiring a fully fledged http.Client,
+// the provided client only needs to implement the HTTPDoer interface.
+// Since *http.Client naturally implements that interface, it can still be used normally.
+func (p *Pusher) Client(c HTTPDoer) *Pusher {
+	p.client = c
+	return p
+}
+
+// BasicAuth configures the Pusher to use HTTP Basic Authentication with the
+// provided username and password. For convenience, this method returns a
+// pointer to the Pusher itself.
+func (p *Pusher) BasicAuth(username, password string) *Pusher {
+	p.useBasicAuth = true
+	p.username = username
+	p.password = password
+	return p
+}
+
+// Format configures the Pusher to use an encoding format given by the
+// provided expfmt.Format. The default format is expfmt.FmtProtoDelim and
+// should be used with the standard Prometheus Pushgateway. Custom
+// implementations may require different formats. For convenience, this
+// method returns a pointer to the Pusher itself.
+func (p *Pusher) Format(format expfmt.Format) *Pusher {
+	p.expfmt = format
+	return p
+}
+
+func (p *Pusher) push(method string) error {
+	if p.error != nil {
+		return p.error
+	}
+	urlComponents := []string{url.QueryEscape(p.job)}
+	for ln, lv := range p.grouping {
+		urlComponents = append(urlComponents, ln, lv)
+	}
+	pushURL := fmt.Sprintf("%s/metrics/job/%s", p.url, strings.Join(urlComponents, "/"))
+
+	mfs, err := p.gatherers.Gather()
+	if err != nil {
+		return err
+	}
+	buf := &bytes.Buffer{}
+	enc := expfmt.NewEncoder(buf, p.expfmt)
+	// Check for pre-existing grouping labels:
+	for _, mf := range mfs {
+		for _, m := range mf.GetMetric() {
+			for _, l := range m.GetLabel() {
+				if l.GetName() == "job" {
+					return fmt.Errorf("pushed metric %s (%s) already contains a job label", mf.GetName(), m)
+				}
+				if _, ok := p.grouping[l.GetName()]; ok {
+					return fmt.Errorf(
+						"pushed metric %s (%s) already contains grouping label %s",
+						mf.GetName(), m, l.GetName(),
+					)
+				}
+			}
+		}
+		enc.Encode(mf)
+	}
+	req, err := http.NewRequest(method, pushURL, buf)
+	if err != nil {
+		return err
+	}
+	if p.useBasicAuth {
+		req.SetBasicAuth(p.username, p.password)
+	}
+	req.Header.Set(contentTypeHeader, string(p.expfmt))
+	resp, err := p.client.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != 202 {
+		body, _ := ioutil.ReadAll(resp.Body) // Ignore any further error as this is for an error message only.
+		return fmt.Errorf("unexpected status code %d while pushing to %s: %s", resp.StatusCode, pushURL, body)
+	}
+	return nil
+}
--- a/vendor/vendor.json
+++ b/vendor/vendor.json
@@ -29,10 +29,10 @@
 		{"path":"github.com/appc/spec/schema/types","checksumSHA1":"kYXCle7Ikc8WqiMs7NXz99bUWqo=","revision":"cbe99b7160b1397bf89f9c8bb1418f69c9424049","revisionTime":"2017-09-19T09:55:19Z"},
 		{"path":"github.com/appc/spec/schema/types/resource","checksumSHA1":"VgPsPj5PH7LKXMa3ZLe5/+Avydo=","revision":"cbe99b7160b1397bf89f9c8bb1418f69c9424049","revisionTime":"2017-09-19T09:55:19Z"},
 		{"path":"github.com/armon/circbuf","checksumSHA1":"l0iFqayYAaEip6Olaq3/LCOa/Sg=","revision":"bbbad097214e2918d8543d5201d12bfd7bca254d"},
-		{"path":"github.com/armon/go-metrics","checksumSHA1":"gaT7FBF9uH5TY4lCo96ySrYXjek=","revision":"c1e99089638e6f1f57fe71461f99f9d00a43ccf1","revisionTime":"2019-04-30T14:02:02Z"},
-		{"path":"github.com/armon/go-metrics/circonus","checksumSHA1":"xCsGGM9TKBogZDfSN536KtQdLko=","revision":"c1e99089638e6f1f57fe71461f99f9d00a43ccf1","revisionTime":"2019-04-30T14:02:02Z"},
-		{"path":"github.com/armon/go-metrics/datadog","checksumSHA1":"Dt0n1sSivvvdZQdzc4Hu/yOG+T0=","revision":"c1e99089638e6f1f57fe71461f99f9d00a43ccf1","revisionTime":"2019-04-30T14:02:02Z"},
-		{"path":"github.com/armon/go-metrics/prometheus","checksumSHA1":"vxr0X6/jCQ4FkMxdhzUaBEWrFGA=","revision":"c1e99089638e6f1f57fe71461f99f9d00a43ccf1","revisionTime":"2019-04-30T14:02:02Z"},
+		{"path":"github.com/armon/go-metrics","checksumSHA1":"lG7VAFqxvwOIhwnHPVT4AWlFLmg=","revision":"38377b616bac08306ad0903d5fb436a5330d2973","revisionTime":"2020-03-04T14:16:55Z","version":"v0.3.3","versionExact":"v0.3.3"},
+		{"path":"github.com/armon/go-metrics/circonus","checksumSHA1":"xCsGGM9TKBogZDfSN536KtQdLko=","revision":"38377b616bac08306ad0903d5fb436a5330d2973","revisionTime":"2020-03-04T14:16:55Z","version":"v0.3.3","versionExact":"v0.3.3"},
+		{"path":"github.com/armon/go-metrics/datadog","checksumSHA1":"Dt0n1sSivvvdZQdzc4Hu/yOG+T0=","revision":"38377b616bac08306ad0903d5fb436a5330d2973","revisionTime":"2020-03-04T14:16:55Z","version":"v0.3.3","versionExact":"v0.3.3"},
+		{"path":"github.com/armon/go-metrics/prometheus","checksumSHA1":"RacPNbQySc2C7zYvO/1zsInZdLY=","revision":"38377b616bac08306ad0903d5fb436a5330d2973","revisionTime":"2020-03-04T14:16:55Z","version":"v0.3.3","versionExact":"v0.3.3"},
 		{"path":"github.com/armon/go-radix","checksumSHA1":"gNO0JNpLzYOdInGeq7HqMZUzx9M=","revision":"4239b77079c7b5d1243b7b4736304ce8ddb6f0f2","revisionTime":"2016-01-15T23:47:25Z"},
 		{"path":"github.com/aws/aws-sdk-go/aws","checksumSHA1":"PtLtFibc096FupcSOXt1tE1n8b8=","comment":"v1.0.6-2-g80dd495","revision":"3724cb09315309e00556944edfc2946859167973","revisionTime":"2019-12-02T08:37:02Z","version":"v1.25.41"},
 		{"path":"github.com/aws/aws-sdk-go/aws/awserr","checksumSHA1":"Ksdhg/+t+jSC8qvpsLZFM7As73Y=","comment":"v1.0.6-2-g80dd495","revision":"3724cb09315309e00556944edfc2946859167973","revisionTime":"2019-12-02T08:37:02Z","version":"v1.25.41"},
@@ -380,6 +380,7 @@
 		{"path":"github.com/prometheus/client_golang/prometheus","checksumSHA1":"5dHjKxShYVWVB1Fb00dAnR6kqVk=","revision":"2641b987480bca71fb39738eb8c8b0d577cb1d76","revisionTime":"2019-06-07T14:56:44Z","version":"v0.9.4","versionExact":"v0.9.4"},
 		{"path":"github.com/prometheus/client_golang/prometheus/internal","checksumSHA1":"UBqhkyjCz47+S19MVTigxJ2VjVQ=","revision":"2641b987480bca71fb39738eb8c8b0d577cb1d76","revisionTime":"2019-06-07T14:56:44Z","version":"v0.9.4","versionExact":"v0.9.4"},
 		{"path":"github.com/prometheus/client_golang/prometheus/promhttp","checksumSHA1":"V51yx4gq61QCD9clxnps792Eq2Y=","revision":"2641b987480bca71fb39738eb8c8b0d577cb1d76","revisionTime":"2019-06-07T14:56:44Z","version":"v0.9.4","versionExact":"v0.9.4"},
+		{"path":"github.com/prometheus/client_golang/prometheus/push","checksumSHA1":"MY80jes+VTzLgZUyq9/0U0rGx4k=","revision":"2641b987480bca71fb39738eb8c8b0d577cb1d76","revisionTime":"2019-06-07T14:56:44Z","version":"v0.9.4","versionExact":"v0.9.4"},
 		{"path":"github.com/prometheus/client_model/go","checksumSHA1":"DvwvOlPNAgRntBzt3b3OSRMS2N4=","revision":"6f3806018612930941127f2a7c6c453ba2c527d2","revisionTime":"2017-02-16T18:52:47Z"},
 		{"path":"github.com/prometheus/common/expfmt","checksumSHA1":"xfnn0THnqNwjwimeTClsxahYrIo=","revision":"2f17f4a9d485bf34b4bfaccc273805040e4f86c8","revisionTime":"2017-09-08T16:18:22Z"},
 		{"path":"github.com/prometheus/common/internal/bitbucket.org/ww/goautoneg","checksumSHA1":"GWlM3d2vPYyNATtTFgftS10/A9w=","revision":"2f17f4a9d485bf34b4bfaccc273805040e4f86c8","revisionTime":"2017-09-08T16:18:22Z"},