Bump k8s.io deps

Signed-off-by: Luca Comellini <luca.com@gmail.com>

vendor/github.com/prometheus/client_golang/prometheus/collectors/collectors.go

@@ -0,0 +1,40 @@
+// Copyright 2021 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 collectors provides implementations of prometheus.Collector to
+// conveniently collect process and Go-related metrics.
+package collectors
+
+import "github.com/prometheus/client_golang/prometheus"
+
+// NewBuildInfoCollector returns a collector collecting a single metric
+// "go_build_info" with the constant value 1 and three labels "path", "version",
+// and "checksum". Their label values contain the main module path, version, and
+// checksum, respectively. The labels will only have meaningful values if the
+// binary is built with Go module support and from source code retrieved from
+// the source repository (rather than the local file system). This is usually
+// accomplished by building from outside of GOPATH, specifying the full address
+// of the main package, e.g. "GO111MODULE=on go run
+// github.com/prometheus/client_golang/examples/random". If built without Go
+// module support, all label values will be "unknown". If built with Go module
+// support but using the source code from the local file system, the "path" will
+// be set appropriately, but "checksum" will be empty and "version" will be
+// "(devel)".
+//
+// This collector uses only the build information for the main module. See
+// https://github.com/povilasv/prommod for an example of a collector for the
+// module dependencies.
+func NewBuildInfoCollector() prometheus.Collector {
+	//nolint:staticcheck // Ignore SA1019 until v2.
+	return prometheus.NewBuildInfoCollector()
+}

vendor/github.com/prometheus/client_golang/prometheus/collectors/dbstats_collector.go

@@ -0,0 +1,119 @@
+// Copyright 2021 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 collectors
+
+import (
+	"database/sql"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+type dbStatsCollector struct {
+	db *sql.DB
+
+	maxOpenConnections *prometheus.Desc
+
+	openConnections  *prometheus.Desc
+	inUseConnections *prometheus.Desc
+	idleConnections  *prometheus.Desc
+
+	waitCount         *prometheus.Desc
+	waitDuration      *prometheus.Desc
+	maxIdleClosed     *prometheus.Desc
+	maxIdleTimeClosed *prometheus.Desc
+	maxLifetimeClosed *prometheus.Desc
+}
+
+// NewDBStatsCollector returns a collector that exports metrics about the given *sql.DB.
+// See https://golang.org/pkg/database/sql/#DBStats for more information on stats.
+func NewDBStatsCollector(db *sql.DB, dbName string) prometheus.Collector {
+	fqName := func(name string) string {
+		return "go_sql_" + name
+	}
+	return &dbStatsCollector{
+		db: db,
+		maxOpenConnections: prometheus.NewDesc(
+			fqName("max_open_connections"),
+			"Maximum number of open connections to the database.",
+			nil, prometheus.Labels{"db_name": dbName},
+		),
+		openConnections: prometheus.NewDesc(
+			fqName("open_connections"),
+			"The number of established connections both in use and idle.",
+			nil, prometheus.Labels{"db_name": dbName},
+		),
+		inUseConnections: prometheus.NewDesc(
+			fqName("in_use_connections"),
+			"The number of connections currently in use.",
+			nil, prometheus.Labels{"db_name": dbName},
+		),
+		idleConnections: prometheus.NewDesc(
+			fqName("idle_connections"),
+			"The number of idle connections.",
+			nil, prometheus.Labels{"db_name": dbName},
+		),
+		waitCount: prometheus.NewDesc(
+			fqName("wait_count_total"),
+			"The total number of connections waited for.",
+			nil, prometheus.Labels{"db_name": dbName},
+		),
+		waitDuration: prometheus.NewDesc(
+			fqName("wait_duration_seconds_total"),
+			"The total time blocked waiting for a new connection.",
+			nil, prometheus.Labels{"db_name": dbName},
+		),
+		maxIdleClosed: prometheus.NewDesc(
+			fqName("max_idle_closed_total"),
+			"The total number of connections closed due to SetMaxIdleConns.",
+			nil, prometheus.Labels{"db_name": dbName},
+		),
+		maxIdleTimeClosed: prometheus.NewDesc(
+			fqName("max_idle_time_closed_total"),
+			"The total number of connections closed due to SetConnMaxIdleTime.",
+			nil, prometheus.Labels{"db_name": dbName},
+		),
+		maxLifetimeClosed: prometheus.NewDesc(
+			fqName("max_lifetime_closed_total"),
+			"The total number of connections closed due to SetConnMaxLifetime.",
+			nil, prometheus.Labels{"db_name": dbName},
+		),
+	}
+}
+
+// Describe implements Collector.
+func (c *dbStatsCollector) Describe(ch chan<- *prometheus.Desc) {
+	ch <- c.maxOpenConnections
+	ch <- c.openConnections
+	ch <- c.inUseConnections
+	ch <- c.idleConnections
+	ch <- c.waitCount
+	ch <- c.waitDuration
+	ch <- c.maxIdleClosed
+	ch <- c.maxLifetimeClosed
+	ch <- c.maxIdleTimeClosed
+}
+
+// Collect implements Collector.
+func (c *dbStatsCollector) Collect(ch chan<- prometheus.Metric) {
+	stats := c.db.Stats()
+	ch <- prometheus.MustNewConstMetric(c.maxOpenConnections, prometheus.GaugeValue, float64(stats.MaxOpenConnections))
+	ch <- prometheus.MustNewConstMetric(c.openConnections, prometheus.GaugeValue, float64(stats.OpenConnections))
+	ch <- prometheus.MustNewConstMetric(c.inUseConnections, prometheus.GaugeValue, float64(stats.InUse))
+	ch <- prometheus.MustNewConstMetric(c.idleConnections, prometheus.GaugeValue, float64(stats.Idle))
+	ch <- prometheus.MustNewConstMetric(c.waitCount, prometheus.CounterValue, float64(stats.WaitCount))
+	ch <- prometheus.MustNewConstMetric(c.waitDuration, prometheus.CounterValue, stats.WaitDuration.Seconds())
+	ch <- prometheus.MustNewConstMetric(c.maxIdleClosed, prometheus.CounterValue, float64(stats.MaxIdleClosed))
+	ch <- prometheus.MustNewConstMetric(c.maxLifetimeClosed, prometheus.CounterValue, float64(stats.MaxLifetimeClosed))
+	ch <- prometheus.MustNewConstMetric(c.maxIdleTimeClosed, prometheus.CounterValue, float64(stats.MaxIdleTimeClosed))
+}

vendor/github.com/prometheus/client_golang/prometheus/collectors/expvar_collector.go

@@ -0,0 +1,57 @@
+// Copyright 2021 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 collectors
+
+import "github.com/prometheus/client_golang/prometheus"
+
+// NewExpvarCollector returns a newly allocated expvar Collector.
+//
+// An expvar Collector collects metrics from the expvar interface. It provides a
+// quick way to expose numeric values that are already exported via expvar as
+// Prometheus metrics. Note that the data models of expvar and Prometheus are
+// fundamentally different, and that the expvar Collector is inherently slower
+// than native Prometheus metrics. Thus, the expvar Collector is probably great
+// for experiments and prototying, but you should seriously consider a more
+// direct implementation of Prometheus metrics for monitoring production
+// systems.
+//
+// The exports map has the following meaning:
+//
+// The keys in the map correspond to expvar keys, i.e. for every expvar key you
+// want to export as Prometheus metric, you need an entry in the exports
+// map. The descriptor mapped to each key describes how to export the expvar
+// value. It defines the name and the help string of the Prometheus metric
+// proxying the expvar value. The type will always be Untyped.
+//
+// For descriptors without variable labels, the expvar value must be a number or
+// a bool. The number is then directly exported as the Prometheus sample
+// value. (For a bool, 'false' translates to 0 and 'true' to 1). Expvar values
+// that are not numbers or bools are silently ignored.
+//
+// If the descriptor has one variable label, the expvar value must be an expvar
+// map. The keys in the expvar map become the various values of the one
+// Prometheus label. The values in the expvar map must be numbers or bools again
+// as above.
+//
+// For descriptors with more than one variable label, the expvar must be a
+// nested expvar map, i.e. where the values of the topmost map are maps again
+// etc. until a depth is reached that corresponds to the number of labels. The
+// leaves of that structure must be numbers or bools as above to serve as the
+// sample values.
+//
+// Anything that does not fit into the scheme above is silently ignored.
+func NewExpvarCollector(exports map[string]*prometheus.Desc) prometheus.Collector {
+	//nolint:staticcheck // Ignore SA1019 until v2.
+	return prometheus.NewExpvarCollector(exports)
+}

vendor/github.com/prometheus/client_golang/prometheus/collectors/go_collector_go116.go

@@ -0,0 +1,49 @@
+// Copyright 2021 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 !go1.17
+// +build !go1.17
+
+package collectors
+
+import "github.com/prometheus/client_golang/prometheus"
+
+// NewGoCollector returns a collector that exports metrics about the current Go
+// process. This includes memory stats. To collect those, runtime.ReadMemStats
+// is called. This requires to “stop the world”, which usually only happens for
+// garbage collection (GC). Take the following implications into account when
+// deciding whether to use the Go collector:
+//
+// 1. The performance impact of stopping the world is the more relevant the more
+// frequently metrics are collected. However, with Go1.9 or later the
+// stop-the-world time per metrics collection is very short (~25µs) so that the
+// performance impact will only matter in rare cases. However, with older Go
+// versions, the stop-the-world duration depends on the heap size and can be
+// quite significant (~1.7 ms/GiB as per
+// https://go-review.googlesource.com/c/go/+/34937).
+//
+// 2. During an ongoing GC, nothing else can stop the world. Therefore, if the
+// metrics collection happens to coincide with GC, it will only complete after
+// GC has finished. Usually, GC is fast enough to not cause problems. However,
+// with a very large heap, GC might take multiple seconds, which is enough to
+// cause scrape timeouts in common setups. To avoid this problem, the Go
+// collector will use the memstats from a previous collection if
+// runtime.ReadMemStats takes more than 1s. However, if there are no previously
+// collected memstats, or their collection is more than 5m ago, the collection
+// will block until runtime.ReadMemStats succeeds.
+//
+// NOTE: The problem is solved in Go 1.15, see
+// https://github.com/golang/go/issues/19812 for the related Go issue.
+func NewGoCollector() prometheus.Collector {
+	return prometheus.NewGoCollector()
+}

vendor/github.com/prometheus/client_golang/prometheus/collectors/go_collector_latest.go

@@ -0,0 +1,160 @@
+// Copyright 2021 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 go1.17
+// +build go1.17
+
+package collectors
+
+import (
+	"regexp"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/internal"
+)
+
+var (
+	// MetricsAll allows all the metrics to be collected from Go runtime.
+	MetricsAll = GoRuntimeMetricsRule{regexp.MustCompile("/.*")}
+	// MetricsGC allows only GC metrics to be collected from Go runtime.
+	// e.g. go_gc_cycles_automatic_gc_cycles_total
+	MetricsGC = GoRuntimeMetricsRule{regexp.MustCompile(`^/gc/.*`)}
+	// MetricsMemory allows only memory metrics to be collected from Go runtime.
+	// e.g. go_memory_classes_heap_free_bytes
+	MetricsMemory = GoRuntimeMetricsRule{regexp.MustCompile(`^/memory/.*`)}
+	// MetricsScheduler allows only scheduler metrics to be collected from Go runtime.
+	// e.g. go_sched_goroutines_goroutines
+	MetricsScheduler = GoRuntimeMetricsRule{regexp.MustCompile(`^/sched/.*`)}
+)
+
+// WithGoCollectorMemStatsMetricsDisabled disables metrics that is gathered in runtime.MemStats structure such as:
+//
+// go_memstats_alloc_bytes
+// go_memstats_alloc_bytes_total
+// go_memstats_sys_bytes
+// go_memstats_lookups_total
+// go_memstats_mallocs_total
+// go_memstats_frees_total
+// go_memstats_heap_alloc_bytes
+// go_memstats_heap_sys_bytes
+// go_memstats_heap_idle_bytes
+// go_memstats_heap_inuse_bytes
+// go_memstats_heap_released_bytes
+// go_memstats_heap_objects
+// go_memstats_stack_inuse_bytes
+// go_memstats_stack_sys_bytes
+// go_memstats_mspan_inuse_bytes
+// go_memstats_mspan_sys_bytes
+// go_memstats_mcache_inuse_bytes
+// go_memstats_mcache_sys_bytes
+// go_memstats_buck_hash_sys_bytes
+// go_memstats_gc_sys_bytes
+// go_memstats_other_sys_bytes
+// go_memstats_next_gc_bytes
+//
+// so the metrics known from pre client_golang v1.12.0,
+//
+// NOTE(bwplotka): The above represents runtime.MemStats statistics, but they are
+// actually implemented using new runtime/metrics package. (except skipped go_memstats_gc_cpu_fraction
+// -- see  https://github.com/prometheus/client_golang/issues/842#issuecomment-861812034 for explanation).
+//
+// Some users might want to disable this on collector level (although you can use scrape relabelling on Prometheus),
+// because similar metrics can be now obtained using WithGoCollectorRuntimeMetrics. Note that the semantics of new
+// metrics might be different, plus the names can be change over time with different Go version.
+//
+// NOTE(bwplotka): Changing metric names can be tedious at times as the alerts, recording rules and dashboards have to be adjusted.
+// The old metrics are also very useful, with many guides and books written about how to interpret them.
+//
+// As a result our recommendation would be to stick with MemStats like metrics and enable other runtime/metrics if you are interested
+// in advanced insights Go provides. See ExampleGoCollector_WithAdvancedGoMetrics.
+func WithGoCollectorMemStatsMetricsDisabled() func(options *internal.GoCollectorOptions) {
+	return func(o *internal.GoCollectorOptions) {
+		o.DisableMemStatsLikeMetrics = true
+	}
+}
+
+// GoRuntimeMetricsRule allow enabling and configuring particular group of runtime/metrics.
+// TODO(bwplotka): Consider adding ability to adjust buckets.
+type GoRuntimeMetricsRule struct {
+	// Matcher represents RE2 expression will match the runtime/metrics from https://golang.bg/src/runtime/metrics/description.go
+	// Use `regexp.MustCompile` or `regexp.Compile` to create this field.
+	Matcher *regexp.Regexp
+}
+
+// WithGoCollectorRuntimeMetrics allows enabling and configuring particular group of runtime/metrics.
+// See the list of metrics https://golang.bg/src/runtime/metrics/description.go (pick the Go version you use there!).
+// You can use this option in repeated manner, which will add new rules. The order of rules is important, the last rule
+// that matches particular metrics is applied.
+func WithGoCollectorRuntimeMetrics(rules ...GoRuntimeMetricsRule) func(options *internal.GoCollectorOptions) {
+	rs := make([]internal.GoCollectorRule, len(rules))
+	for i, r := range rules {
+		rs[i] = internal.GoCollectorRule{
+			Matcher: r.Matcher,
+		}
+	}
+
+	return func(o *internal.GoCollectorOptions) {
+		o.RuntimeMetricRules = append(o.RuntimeMetricRules, rs...)
+	}
+}
+
+// WithoutGoCollectorRuntimeMetrics allows disabling group of runtime/metrics that you might have added in WithGoCollectorRuntimeMetrics.
+// It behaves similarly to WithGoCollectorRuntimeMetrics just with deny-list semantics.
+func WithoutGoCollectorRuntimeMetrics(matchers ...*regexp.Regexp) func(options *internal.GoCollectorOptions) {
+	rs := make([]internal.GoCollectorRule, len(matchers))
+	for i, m := range matchers {
+		rs[i] = internal.GoCollectorRule{
+			Matcher: m,
+			Deny:    true,
+		}
+	}
+
+	return func(o *internal.GoCollectorOptions) {
+		o.RuntimeMetricRules = append(o.RuntimeMetricRules, rs...)
+	}
+}
+
+// GoCollectionOption represents Go collection option flag.
+// Deprecated.
+type GoCollectionOption uint32
+
+const (
+	// GoRuntimeMemStatsCollection represents the metrics represented by runtime.MemStats structure.
+	// Deprecated. Use WithGoCollectorMemStatsMetricsDisabled() function to disable those metrics in the collector.
+	GoRuntimeMemStatsCollection GoCollectionOption = 1 << iota
+	// GoRuntimeMetricsCollection is the new set of metrics represented by runtime/metrics package.
+	// Deprecated. Use WithGoCollectorRuntimeMetrics(GoRuntimeMetricsRule{Matcher: regexp.MustCompile("/.*")})
+	// function to enable those metrics in the collector.
+	GoRuntimeMetricsCollection
+)
+
+// WithGoCollections allows enabling different collections for Go collector on top of base metrics.
+// Deprecated. Use WithGoCollectorRuntimeMetrics() and WithGoCollectorMemStatsMetricsDisabled() instead to control metrics.
+func WithGoCollections(flags GoCollectionOption) func(options *internal.GoCollectorOptions) {
+	return func(options *internal.GoCollectorOptions) {
+		if flags&GoRuntimeMemStatsCollection == 0 {
+			WithGoCollectorMemStatsMetricsDisabled()(options)
+		}
+
+		if flags&GoRuntimeMetricsCollection != 0 {
+			WithGoCollectorRuntimeMetrics(GoRuntimeMetricsRule{Matcher: regexp.MustCompile("/.*")})(options)
+		}
+	}
+}
+
+// NewGoCollector returns a collector that exports metrics about the current Go
+// process using debug.GCStats (base metrics) and runtime/metrics (both in MemStats style and new ones).
+func NewGoCollector(opts ...func(o *internal.GoCollectorOptions)) prometheus.Collector {
+	//nolint:staticcheck // Ignore SA1019 until v2.
+	return prometheus.NewGoCollector(opts...)
+}

vendor/github.com/prometheus/client_golang/prometheus/collectors/process_collector.go

@@ -0,0 +1,56 @@
+// Copyright 2021 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 collectors
+
+import "github.com/prometheus/client_golang/prometheus"
+
+// ProcessCollectorOpts defines the behavior of a process metrics collector
+// created with NewProcessCollector.
+type ProcessCollectorOpts struct {
+	// PidFn returns the PID of the process the collector collects metrics
+	// for. It is called upon each collection. By default, the PID of the
+	// current process is used, as determined on construction time by
+	// calling os.Getpid().
+	PidFn func() (int, error)
+	// If non-empty, each of the collected metrics is prefixed by the
+	// provided string and an underscore ("_").
+	Namespace string
+	// If true, any error encountered during collection is reported as an
+	// invalid metric (see NewInvalidMetric). Otherwise, errors are ignored
+	// and the collected metrics will be incomplete. (Possibly, no metrics
+	// will be collected at all.) While that's usually not desired, it is
+	// appropriate for the common "mix-in" of process metrics, where process
+	// metrics are nice to have, but failing to collect them should not
+	// disrupt the collection of the remaining metrics.
+	ReportErrors bool
+}
+
+// NewProcessCollector returns a collector which exports the current state of
+// process metrics including CPU, memory and file descriptor usage as well as
+// the process start time. The detailed behavior is defined by the provided
+// ProcessCollectorOpts. The zero value of ProcessCollectorOpts creates a
+// collector for the current process with an empty namespace string and no error
+// reporting.
+//
+// The collector only works on operating systems with a Linux-style proc
+// filesystem and on Microsoft Windows. On other operating systems, it will not
+// collect any metrics.
+func NewProcessCollector(opts ProcessCollectorOpts) prometheus.Collector {
+	//nolint:staticcheck // Ignore SA1019 until v2.
+	return prometheus.NewProcessCollector(prometheus.ProcessCollectorOpts{
+		PidFn:        opts.PidFn,
+		Namespace:    opts.Namespace,
+		ReportErrors: opts.ReportErrors,
+	})
+}

vendor/github.com/prometheus/client_golang/prometheus/counter.go

@@ -140,12 +140,13 @@ func (c *counter) get() float64 {
 }
 
 func (c *counter) Write(out *dto.Metric) error {
-	val := c.get()
-
+	// Read the Exemplar first and the value second. This is to avoid a race condition
+	// where users see an exemplar for a not-yet-existing observation.
 	var exemplar *dto.Exemplar
 	if e := c.exemplar.Load(); e != nil {
 		exemplar = e.(*dto.Exemplar)
 	}
+	val := c.get()
 
 	return populateMetric(CounterValue, val, c.labelPairs, exemplar, out)
 }
@@ -245,7 +246,8 @@ func (v *CounterVec) GetMetricWith(labels Labels) (Counter, error) {
 // WithLabelValues works as GetMetricWithLabelValues, but panics where
 // GetMetricWithLabelValues would have returned an error. Not returning an
 // error allows shortcuts like
-//     myVec.WithLabelValues("404", "GET").Add(42)
+//
+//	myVec.WithLabelValues("404", "GET").Add(42)
 func (v *CounterVec) WithLabelValues(lvs ...string) Counter {
 	c, err := v.GetMetricWithLabelValues(lvs...)
 	if err != nil {
@@ -256,7 +258,8 @@ func (v *CounterVec) WithLabelValues(lvs ...string) Counter {
 
 // With works as GetMetricWith, but panics where GetMetricWithLabels would have
 // returned an error. Not returning an error allows shortcuts like
-//     myVec.With(prometheus.Labels{"code": "404", "method": "GET"}).Add(42)
+//
+//	myVec.With(prometheus.Labels{"code": "404", "method": "GET"}).Add(42)
 func (v *CounterVec) With(labels Labels) Counter {
 	c, err := v.GetMetricWith(labels)
 	if err != nil {

vendor/github.com/prometheus/client_golang/prometheus/doc.go

@@ -21,55 +21,66 @@
 // All exported functions and methods are safe to be used concurrently unless
 // specified otherwise.
 //
-// A Basic Example
+// # A Basic Example
 //
 // As a starting point, a very basic usage example:
 //
-//    package main
+//	package main
 //
-//    import (
-//    	"log"
-//    	"net/http"
+//	import (
+//		"log"
+//		"net/http"
 //
-//    	"github.com/prometheus/client_golang/prometheus"
-//    	"github.com/prometheus/client_golang/prometheus/promhttp"
-//    )
+//		"github.com/prometheus/client_golang/prometheus"
+//		"github.com/prometheus/client_golang/prometheus/promhttp"
+//	)
 //
-//    var (
-//    	cpuTemp = prometheus.NewGauge(prometheus.GaugeOpts{
-//    		Name: "cpu_temperature_celsius",
-//    		Help: "Current temperature of the CPU.",
-//    	})
-//    	hdFailures = prometheus.NewCounterVec(
-//    		prometheus.CounterOpts{
-//    			Name: "hd_errors_total",
-//    			Help: "Number of hard-disk errors.",
-//    		},
-//    		[]string{"device"},
-//    	)
-//    )
+//	type metrics struct {
+//		cpuTemp  prometheus.Gauge
+//	  hdFailures *prometheus.CounterVec
+//	}
 //
-//    func init() {
-//    	// Metrics have to be registered to be exposed:
-//    	prometheus.MustRegister(cpuTemp)
-//    	prometheus.MustRegister(hdFailures)
-//    }
+//	func NewMetrics(reg prometheus.Registerer) *metrics {
+//	  m := &metrics{
+//	    cpuTemp: prometheus.NewGauge(prometheus.GaugeOpts{
+//	      Name: "cpu_temperature_celsius",
+//	      Help: "Current temperature of the CPU.",
+//	    }),
+//	    hdFailures: prometheus.NewCounterVec(
+//	      prometheus.CounterOpts{
+//	        Name: "hd_errors_total",
+//	        Help: "Number of hard-disk errors.",
+//	      },
+//	      []string{"device"},
+//	    ),
+//	  }
+//	  reg.MustRegister(m.cpuTemp)
+//	  reg.MustRegister(m.hdFailures)
+//	  return m
+//	}
 //
-//    func main() {
-//    	cpuTemp.Set(65.3)
-//    	hdFailures.With(prometheus.Labels{"device":"/dev/sda"}).Inc()
+//	func main() {
+//	  // Create a non-global registry.
+//	  reg := prometheus.NewRegistry()
 //
-//    	// The Handler function provides a default handler to expose metrics
-//    	// via an HTTP server. "/metrics" is the usual endpoint for that.
-//    	http.Handle("/metrics", promhttp.Handler())
-//    	log.Fatal(http.ListenAndServe(":8080", nil))
-//    }
+//	  // Create new metrics and register them using the custom registry.
+//	  m := NewMetrics(reg)
+//	  // Set values for the new created metrics.
+//		m.cpuTemp.Set(65.3)
+//		m.hdFailures.With(prometheus.Labels{"device":"/dev/sda"}).Inc()
 //
+//		// Expose metrics and custom registry via an HTTP server
+//		// using the HandleFor function. "/metrics" is the usual endpoint for that.
+//		http.Handle("/metrics", promhttp.HandlerFor(reg, promhttp.HandlerOpts{Registry: reg}))
+//		log.Fatal(http.ListenAndServe(":8080", nil))
+//	}
 //
 // This is a complete program that exports two metrics, a Gauge and a Counter,
 // the latter with a label attached to turn it into a (one-dimensional) vector.
+// It register the metrics using a custom registry and exposes them via an HTTP server
+// on the /metrics endpoint.
 //
-// Metrics
+// # Metrics
 //
 // The number of exported identifiers in this package might appear a bit
 // overwhelming. However, in addition to the basic plumbing shown in the example
@@ -100,7 +111,7 @@
 // To create instances of Metrics and their vector versions, you need a suitable
 // …Opts struct, i.e. GaugeOpts, CounterOpts, SummaryOpts, or HistogramOpts.
 //
-// Custom Collectors and constant Metrics
+// # Custom Collectors and constant Metrics
 //
 // While you could create your own implementations of Metric, most likely you
 // will only ever implement the Collector interface on your own. At a first
@@ -141,7 +152,7 @@
 // a metric, GaugeFunc, CounterFunc, or UntypedFunc might be interesting
 // shortcuts.
 //
-// Advanced Uses of the Registry
+// # Advanced Uses of the Registry
 //
 // While MustRegister is the by far most common way of registering a Collector,
 // sometimes you might want to handle the errors the registration might cause.
@@ -176,23 +187,23 @@
 // NewProcessCollector). With a custom registry, you are in control and decide
 // yourself about the Collectors to register.
 //
-// HTTP Exposition
+// # HTTP Exposition
 //
 // The Registry implements the Gatherer interface. The caller of the Gather
 // method can then expose the gathered metrics in some way. Usually, the metrics
 // are served via HTTP on the /metrics endpoint. That's happening in the example
 // above. The tools to expose metrics via HTTP are in the promhttp sub-package.
 //
-// Pushing to the Pushgateway
+// # Pushing to the Pushgateway
 //
 // Function for pushing to the Pushgateway can be found in the push sub-package.
 //
-// Graphite Bridge
+// # Graphite Bridge
 //
 // Functions and examples to push metrics from a Gatherer to Graphite can be
 // found in the graphite sub-package.
 //
-// Other Means of Exposition
+// # Other Means of Exposition
 //
 // More ways of exposing metrics can easily be added by following the approaches
 // of the existing implementations.

vendor/github.com/prometheus/client_golang/prometheus/gauge.go

@@ -210,7 +210,8 @@ func (v *GaugeVec) GetMetricWith(labels Labels) (Gauge, error) {
 // WithLabelValues works as GetMetricWithLabelValues, but panics where
 // GetMetricWithLabelValues would have returned an error. Not returning an
 // error allows shortcuts like
-//     myVec.WithLabelValues("404", "GET").Add(42)
+//
+//	myVec.WithLabelValues("404", "GET").Add(42)
 func (v *GaugeVec) WithLabelValues(lvs ...string) Gauge {
 	g, err := v.GetMetricWithLabelValues(lvs...)
 	if err != nil {
@@ -221,7 +222,8 @@ func (v *GaugeVec) WithLabelValues(lvs ...string) Gauge {
 
 // With works as GetMetricWith, but panics where GetMetricWithLabels would have
 // returned an error. Not returning an error allows shortcuts like
-//     myVec.With(prometheus.Labels{"code": "404", "method": "GET"}).Add(42)
+//
+//	myVec.With(prometheus.Labels{"code": "404", "method": "GET"}).Add(42)
 func (v *GaugeVec) With(labels Labels) Gauge {
 	g, err := v.GetMetricWith(labels)
 	if err != nil {

vendor/github.com/prometheus/client_golang/prometheus/internal/almost_equal.go

@@ -0,0 +1,60 @@
+// Copyright (c) 2015 Björn Rabenstein
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+//
+// The code in this package is copy/paste to avoid a dependency. Hence this file
+// carries the copyright of the original repo.
+// https://github.com/beorn7/floats
+package internal
+
+import (
+	"math"
+)
+
+// minNormalFloat64 is the smallest positive normal value of type float64.
+var minNormalFloat64 = math.Float64frombits(0x0010000000000000)
+
+// AlmostEqualFloat64 returns true if a and b are equal within a relative error
+// of epsilon. See http://floating-point-gui.de/errors/comparison/ for the
+// details of the applied method.
+func AlmostEqualFloat64(a, b, epsilon float64) bool {
+	if a == b {
+		return true
+	}
+	absA := math.Abs(a)
+	absB := math.Abs(b)
+	diff := math.Abs(a - b)
+	if a == 0 || b == 0 || absA+absB < minNormalFloat64 {
+		return diff < epsilon*minNormalFloat64
+	}
+	return diff/math.Min(absA+absB, math.MaxFloat64) < epsilon
+}
+
+// AlmostEqualFloat64s is the slice form of AlmostEqualFloat64.
+func AlmostEqualFloat64s(a, b []float64, epsilon float64) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	for i := range a {
+		if !AlmostEqualFloat64(a[i], b[i], epsilon) {
+			return false
+		}
+	}
+	return true
+}

vendor/github.com/prometheus/client_golang/prometheus/internal/difflib.go

@@ -201,12 +201,15 @@ func (m *SequenceMatcher) isBJunk(s string) bool {
 // If IsJunk is not defined:
 //
 // Return (i,j,k) such that a[i:i+k] is equal to b[j:j+k], where
-//     alo <= i <= i+k <= ahi
-//     blo <= j <= j+k <= bhi
+//
+//	alo <= i <= i+k <= ahi
+//	blo <= j <= j+k <= bhi
+//
 // and for all (i',j',k') meeting those conditions,
-//     k >= k'
-//     i <= i'
-//     and if i == i', j <= j'
+//
+//	k >= k'
+//	i <= i'
+//	and if i == i', j <= j'
 //
 // In other words, of all maximal matching blocks, return one that
 // starts earliest in a, and of all those maximal matching blocks that

vendor/github.com/prometheus/client_golang/prometheus/labels.go

@@ -25,7 +25,8 @@ import (
 // Labels represents a collection of label name -> value mappings. This type is
 // commonly used with the With(Labels) and GetMetricWith(Labels) methods of
 // metric vector Collectors, e.g.:
-//     myVec.With(Labels{"code": "404", "method": "GET"}).Add(42)
+//
+//	myVec.With(Labels{"code": "404", "method": "GET"}).Add(42)
 //
 // The other use-case is the specification of constant label pairs in Opts or to
 // create a Desc.

vendor/github.com/prometheus/client_golang/prometheus/metric.go

@@ -187,7 +187,7 @@ func (m *withExemplarsMetric) Write(pb *dto.Metric) error {
 			} else {
 				// The +Inf bucket should be explicitly added if there is an exemplar for it, similar to non-const histogram logic in https://github.com/prometheus/client_golang/blob/main/prometheus/histogram.go#L357-L365.
 				b := &dto.Bucket{
-					CumulativeCount: proto.Uint64(pb.Histogram.Bucket[len(pb.Histogram.GetBucket())-1].GetCumulativeCount()),
+					CumulativeCount: proto.Uint64(pb.Histogram.GetSampleCount()),
 					UpperBound:      proto.Float64(math.Inf(1)),
 					Exemplar:        e,
 				}

vendor/github.com/prometheus/client_golang/prometheus/promhttp/instrument_client.go

@@ -73,12 +73,11 @@ func InstrumentRoundTripperCounter(counter *prometheus.CounterVec, next http.Rou
 	return func(r *http.Request) (*http.Response, error) {
 		resp, err := next.RoundTrip(r)
 		if err == nil {
-			exemplarAdd(
+			addWithExemplar(
 				counter.With(labels(code, method, r.Method, resp.StatusCode, rtOpts.extraMethods...)),
 				1,
 				rtOpts.getExemplarFn(r.Context()),
 			)
-			counter.With(labels(code, method, r.Method, resp.StatusCode, rtOpts.extraMethods...)).Inc()
 		}
 		return resp, err
 	}
@@ -117,7 +116,7 @@ func InstrumentRoundTripperDuration(obs prometheus.ObserverVec, next http.RoundT
 		start := time.Now()
 		resp, err := next.RoundTrip(r)
 		if err == nil {
-			exemplarObserve(
+			observeWithExemplar(
 				obs.With(labels(code, method, r.Method, resp.StatusCode, rtOpts.extraMethods...)),
 				time.Since(start).Seconds(),
 				rtOpts.getExemplarFn(r.Context()),

vendor/github.com/prometheus/client_golang/prometheus/promhttp/instrument_server.go

@@ -28,7 +28,9 @@ import (
 // magicString is used for the hacky label test in checkLabels. Remove once fixed.
 const magicString = "zZgWfBxLqvG8kc8IMv3POi2Bb0tZI3vAnBx+gBaFi9FyPzB/CzKUer1yufDa"
 
-func exemplarObserve(obs prometheus.Observer, val float64, labels map[string]string) {
+// observeWithExemplar is a wrapper for [prometheus.ExemplarAdder.ExemplarObserver],
+// which falls back to [prometheus.Observer.Observe] if no labels are provided.
+func observeWithExemplar(obs prometheus.Observer, val float64, labels map[string]string) {
 	if labels == nil {
 		obs.Observe(val)
 		return
@@ -36,7 +38,9 @@ func exemplarObserve(obs prometheus.Observer, val float64, labels map[string]str
 	obs.(prometheus.ExemplarObserver).ObserveWithExemplar(val, labels)
 }
 
-func exemplarAdd(obs prometheus.Counter, val float64, labels map[string]string) {
+// addWithExemplar is a wrapper for [prometheus.ExemplarAdder.AddWithExemplar],
+// which falls back to [prometheus.Counter.Add] if no labels are provided.
+func addWithExemplar(obs prometheus.Counter, val float64, labels map[string]string) {
 	if labels == nil {
 		obs.Add(val)
 		return
@@ -91,7 +95,7 @@ func InstrumentHandlerDuration(obs prometheus.ObserverVec, next http.Handler, op
 			d := newDelegator(w, nil)
 			next.ServeHTTP(d, r)
 
-			exemplarObserve(
+			observeWithExemplar(
 				obs.With(labels(code, method, r.Method, d.Status(), hOpts.extraMethods...)),
 				time.Since(now).Seconds(),
 				hOpts.getExemplarFn(r.Context()),
@@ -103,7 +107,7 @@ func InstrumentHandlerDuration(obs prometheus.ObserverVec, next http.Handler, op
 		now := time.Now()
 		next.ServeHTTP(w, r)
 
-		exemplarObserve(
+		observeWithExemplar(
 			obs.With(labels(code, method, r.Method, 0, hOpts.extraMethods...)),
 			time.Since(now).Seconds(),
 			hOpts.getExemplarFn(r.Context()),
@@ -141,7 +145,7 @@ func InstrumentHandlerCounter(counter *prometheus.CounterVec, next http.Handler,
 			d := newDelegator(w, nil)
 			next.ServeHTTP(d, r)
 
-			exemplarAdd(
+			addWithExemplar(
 				counter.With(labels(code, method, r.Method, d.Status(), hOpts.extraMethods...)),
 				1,
 				hOpts.getExemplarFn(r.Context()),
@@ -151,7 +155,7 @@ func InstrumentHandlerCounter(counter *prometheus.CounterVec, next http.Handler,
 
 	return func(w http.ResponseWriter, r *http.Request) {
 		next.ServeHTTP(w, r)
-		exemplarAdd(
+		addWithExemplar(
 			counter.With(labels(code, method, r.Method, 0, hOpts.extraMethods...)),
 			1,
 			hOpts.getExemplarFn(r.Context()),
@@ -192,7 +196,7 @@ func InstrumentHandlerTimeToWriteHeader(obs prometheus.ObserverVec, next http.Ha
 	return func(w http.ResponseWriter, r *http.Request) {
 		now := time.Now()
 		d := newDelegator(w, func(status int) {
-			exemplarObserve(
+			observeWithExemplar(
 				obs.With(labels(code, method, r.Method, status, hOpts.extraMethods...)),
 				time.Since(now).Seconds(),
 				hOpts.getExemplarFn(r.Context()),
@@ -233,7 +237,7 @@ func InstrumentHandlerRequestSize(obs prometheus.ObserverVec, next http.Handler,
 			d := newDelegator(w, nil)
 			next.ServeHTTP(d, r)
 			size := computeApproximateRequestSize(r)
-			exemplarObserve(
+			observeWithExemplar(
 				obs.With(labels(code, method, r.Method, d.Status(), hOpts.extraMethods...)),
 				float64(size),
 				hOpts.getExemplarFn(r.Context()),
@@ -244,7 +248,7 @@ func InstrumentHandlerRequestSize(obs prometheus.ObserverVec, next http.Handler,
 	return func(w http.ResponseWriter, r *http.Request) {
 		next.ServeHTTP(w, r)
 		size := computeApproximateRequestSize(r)
-		exemplarObserve(
+		observeWithExemplar(
 			obs.With(labels(code, method, r.Method, 0, hOpts.extraMethods...)),
 			float64(size),
 			hOpts.getExemplarFn(r.Context()),
@@ -282,7 +286,7 @@ func InstrumentHandlerResponseSize(obs prometheus.ObserverVec, next http.Handler
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		d := newDelegator(w, nil)
 		next.ServeHTTP(d, r)
-		exemplarObserve(
+		observeWithExemplar(
 			obs.With(labels(code, method, r.Method, d.Status(), hOpts.extraMethods...)),
 			float64(d.Written()),
 			hOpts.getExemplarFn(r.Context()),

vendor/github.com/prometheus/client_golang/prometheus/registry.go

@@ -252,9 +252,12 @@ func (errs MultiError) MaybeUnwrap() error {
 }
 
 // Registry registers Prometheus collectors, collects their metrics, and gathers
-// them into MetricFamilies for exposition. It implements both Registerer and
-// Gatherer. The zero value is not usable. Create instances with NewRegistry or
-// NewPedanticRegistry.
+// them into MetricFamilies for exposition. It implements Registerer, Gatherer,
+// and Collector. The zero value is not usable. Create instances with
+// NewRegistry or NewPedanticRegistry.
+//
+// Registry implements Collector to allow it to be used for creating groups of
+// metrics. See the Grouping example for how this can be done.
 type Registry struct {
 	mtx                   sync.RWMutex
 	collectorsByID        map[uint64]Collector // ID is a hash of the descIDs.
@@ -556,6 +559,31 @@ func (r *Registry) Gather() ([]*dto.MetricFamily, error) {
 	return internal.NormalizeMetricFamilies(metricFamiliesByName), errs.MaybeUnwrap()
 }
 
+// Describe implements Collector.
+func (r *Registry) Describe(ch chan<- *Desc) {
+	r.mtx.RLock()
+	defer r.mtx.RUnlock()
+
+	// Only report the checked Collectors; unchecked collectors don't report any
+	// Desc.
+	for _, c := range r.collectorsByID {
+		c.Describe(ch)
+	}
+}
+
+// Collect implements Collector.
+func (r *Registry) Collect(ch chan<- Metric) {
+	r.mtx.RLock()
+	defer r.mtx.RUnlock()
+
+	for _, c := range r.collectorsByID {
+		c.Collect(ch)
+	}
+	for _, c := range r.uncheckedCollectors {
+		c.Collect(ch)
+	}
+}
+
 // WriteToTextfile calls Gather on the provided Gatherer, encodes the result in the
 // Prometheus text format, and writes it to a temporary file. Upon success, the
 // temporary file is renamed to the provided filename.

vendor/github.com/prometheus/client_golang/prometheus/summary.go

@@ -603,7 +603,8 @@ func (v *SummaryVec) GetMetricWith(labels Labels) (Observer, error) {
 // WithLabelValues works as GetMetricWithLabelValues, but panics where
 // GetMetricWithLabelValues would have returned an error. Not returning an
 // error allows shortcuts like
-//     myVec.WithLabelValues("404", "GET").Observe(42.21)
+//
+//	myVec.WithLabelValues("404", "GET").Observe(42.21)
 func (v *SummaryVec) WithLabelValues(lvs ...string) Observer {
 	s, err := v.GetMetricWithLabelValues(lvs...)
 	if err != nil {
@@ -614,7 +615,8 @@ func (v *SummaryVec) WithLabelValues(lvs ...string) Observer {
 
 // With works as GetMetricWith, but panics where GetMetricWithLabels would have
 // returned an error. Not returning an error allows shortcuts like
-//     myVec.With(prometheus.Labels{"code": "404", "method": "GET"}).Observe(42.21)
+//
+//	myVec.With(prometheus.Labels{"code": "404", "method": "GET"}).Observe(42.21)
 func (v *SummaryVec) With(labels Labels) Observer {
 	s, err := v.GetMetricWith(labels)
 	if err != nil {
@@ -701,7 +703,8 @@ func (s *constSummary) Write(out *dto.Metric) error {
 //
 // quantiles maps ranks to quantile values. For example, a median latency of
 // 0.23s and a 99th percentile latency of 0.56s would be expressed as:
-//     map[float64]float64{0.5: 0.23, 0.99: 0.56}
+//
+//	map[float64]float64{0.5: 0.23, 0.99: 0.56}
 //
 // NewConstSummary returns an error if the length of labelValues is not
 // consistent with the variable labels in Desc or if Desc is invalid.

vendor/github.com/prometheus/client_golang/prometheus/timer.go

@@ -25,11 +25,12 @@ type Timer struct {
 // NewTimer creates a new Timer. The provided Observer is used to observe a
 // duration in seconds. Timer is usually used to time a function call in the
 // following way:
-//    func TimeMe() {
-//        timer := NewTimer(myHistogram)
-//        defer timer.ObserveDuration()
-//        // Do actual work.
-//    }
+//
+//	func TimeMe() {
+//	    timer := NewTimer(myHistogram)
+//	    defer timer.ObserveDuration()
+//	    // Do actual work.
+//	}
 func NewTimer(o Observer) *Timer {
 	return &Timer{
 		begin:    time.Now(),

vendor/github.com/prometheus/client_model/go/metrics.pb.go

@@ -1,5 +1,5 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
-// source: metrics.proto
+// source: io/prometheus/client/metrics.proto
 
 package io_prometheus_client
 
@@ -24,11 +24,18 @@ const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
 type MetricType int32
 
 const (
-	MetricType_COUNTER   MetricType = 0
-	MetricType_GAUGE     MetricType = 1
-	MetricType_SUMMARY   MetricType = 2
-	MetricType_UNTYPED   MetricType = 3
+	// COUNTER must use the Metric field "counter".
+	MetricType_COUNTER MetricType = 0
+	// GAUGE must use the Metric field "gauge".
+	MetricType_GAUGE MetricType = 1
+	// SUMMARY must use the Metric field "summary".
+	MetricType_SUMMARY MetricType = 2
+	// UNTYPED must use the Metric field "untyped".
+	MetricType_UNTYPED MetricType = 3
+	// HISTOGRAM must use the Metric field "histogram".
 	MetricType_HISTOGRAM MetricType = 4
+	// GAUGE_HISTOGRAM must use the Metric field "histogram".
+	MetricType_GAUGE_HISTOGRAM MetricType = 5
 )
 
 var MetricType_name = map[int32]string{
@@ -37,14 +44,16 @@ var MetricType_name = map[int32]string{
 	2: "SUMMARY",
 	3: "UNTYPED",
 	4: "HISTOGRAM",
+	5: "GAUGE_HISTOGRAM",
 }
 
 var MetricType_value = map[string]int32{
-	"COUNTER":   0,
-	"GAUGE":     1,
-	"SUMMARY":   2,
-	"UNTYPED":   3,
-	"HISTOGRAM": 4,
+	"COUNTER":         0,
+	"GAUGE":           1,
+	"SUMMARY":         2,
+	"UNTYPED":         3,
+	"HISTOGRAM":       4,
+	"GAUGE_HISTOGRAM": 5,
 }
 
 func (x MetricType) Enum() *MetricType {
@@ -67,7 +76,7 @@ func (x *MetricType) UnmarshalJSON(data []byte) error {
 }
 
 func (MetricType) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_6039342a2ba47b72, []int{0}
+	return fileDescriptor_d1e5ddb18987a258, []int{0}
 }
 
 type LabelPair struct {
@@ -82,7 +91,7 @@ func (m *LabelPair) Reset()         { *m = LabelPair{} }
 func (m *LabelPair) String() string { return proto.CompactTextString(m) }
 func (*LabelPair) ProtoMessage()    {}
 func (*LabelPair) Descriptor() ([]byte, []int) {
-	return fileDescriptor_6039342a2ba47b72, []int{0}
+	return fileDescriptor_d1e5ddb18987a258, []int{0}
 }
 
 func (m *LabelPair) XXX_Unmarshal(b []byte) error {
@@ -128,7 +137,7 @@ func (m *Gauge) Reset()         { *m = Gauge{} }
 func (m *Gauge) String() string { return proto.CompactTextString(m) }
 func (*Gauge) ProtoMessage()    {}
 func (*Gauge) Descriptor() ([]byte, []int) {
-	return fileDescriptor_6039342a2ba47b72, []int{1}
+	return fileDescriptor_d1e5ddb18987a258, []int{1}
 }
 
 func (m *Gauge) XXX_Unmarshal(b []byte) error {
@@ -168,7 +177,7 @@ func (m *Counter) Reset()         { *m = Counter{} }
 func (m *Counter) String() string { return proto.CompactTextString(m) }
 func (*Counter) ProtoMessage()    {}
 func (*Counter) Descriptor() ([]byte, []int) {
-	return fileDescriptor_6039342a2ba47b72, []int{2}
+	return fileDescriptor_d1e5ddb18987a258, []int{2}
 }
 
 func (m *Counter) XXX_Unmarshal(b []byte) error {
@@ -215,7 +224,7 @@ func (m *Quantile) Reset()         { *m = Quantile{} }
 func (m *Quantile) String() string { return proto.CompactTextString(m) }
 func (*Quantile) ProtoMessage()    {}
 func (*Quantile) Descriptor() ([]byte, []int) {
-	return fileDescriptor_6039342a2ba47b72, []int{3}
+	return fileDescriptor_d1e5ddb18987a258, []int{3}
 }
 
 func (m *Quantile) XXX_Unmarshal(b []byte) error {
@@ -263,7 +272,7 @@ func (m *Summary) Reset()         { *m = Summary{} }
 func (m *Summary) String() string { return proto.CompactTextString(m) }
 func (*Summary) ProtoMessage()    {}
 func (*Summary) Descriptor() ([]byte, []int) {
-	return fileDescriptor_6039342a2ba47b72, []int{4}
+	return fileDescriptor_d1e5ddb18987a258, []int{4}
 }
 
 func (m *Summary) XXX_Unmarshal(b []byte) error {
@@ -316,7 +325,7 @@ func (m *Untyped) Reset()         { *m = Untyped{} }
 func (m *Untyped) String() string { return proto.CompactTextString(m) }
 func (*Untyped) ProtoMessage()    {}
 func (*Untyped) Descriptor() ([]byte, []int) {
-	return fileDescriptor_6039342a2ba47b72, []int{5}
+	return fileDescriptor_d1e5ddb18987a258, []int{5}
 }
 
 func (m *Untyped) XXX_Unmarshal(b []byte) error {
@@ -345,9 +354,34 @@ func (m *Untyped) GetValue() float64 {
 }
 
 type Histogram struct {
-	SampleCount          *uint64   `protobuf:"varint,1,opt,name=sample_count,json=sampleCount" json:"sample_count,omitempty"`
-	SampleSum            *float64  `protobuf:"fixed64,2,opt,name=sample_sum,json=sampleSum" json:"sample_sum,omitempty"`
-	Bucket               []*Bucket `protobuf:"bytes,3,rep,name=bucket" json:"bucket,omitempty"`
+	SampleCount      *uint64  `protobuf:"varint,1,opt,name=sample_count,json=sampleCount" json:"sample_count,omitempty"`
+	SampleCountFloat *float64 `protobuf:"fixed64,4,opt,name=sample_count_float,json=sampleCountFloat" json:"sample_count_float,omitempty"`
+	SampleSum        *float64 `protobuf:"fixed64,2,opt,name=sample_sum,json=sampleSum" json:"sample_sum,omitempty"`
+	// Buckets for the conventional histogram.
+	Bucket []*Bucket `protobuf:"bytes,3,rep,name=bucket" json:"bucket,omitempty"`
+	// schema defines the bucket schema. Currently, valid numbers are -4 <= n <= 8.
+	// They are all for base-2 bucket schemas, where 1 is a bucket boundary in each case, and
+	// then each power of two is divided into 2^n logarithmic buckets.
+	// Or in other words, each bucket boundary is the previous boundary times 2^(2^-n).
+	// In the future, more bucket schemas may be added using numbers < -4 or > 8.
+	Schema         *int32   `protobuf:"zigzag32,5,opt,name=schema" json:"schema,omitempty"`
+	ZeroThreshold  *float64 `protobuf:"fixed64,6,opt,name=zero_threshold,json=zeroThreshold" json:"zero_threshold,omitempty"`
+	ZeroCount      *uint64  `protobuf:"varint,7,opt,name=zero_count,json=zeroCount" json:"zero_count,omitempty"`
+	ZeroCountFloat *float64 `protobuf:"fixed64,8,opt,name=zero_count_float,json=zeroCountFloat" json:"zero_count_float,omitempty"`
+	// Negative buckets for the native histogram.
+	NegativeSpan []*BucketSpan `protobuf:"bytes,9,rep,name=negative_span,json=negativeSpan" json:"negative_span,omitempty"`
+	// Use either "negative_delta" or "negative_count", the former for
+	// regular histograms with integer counts, the latter for float
+	// histograms.
+	NegativeDelta []int64   `protobuf:"zigzag64,10,rep,name=negative_delta,json=negativeDelta" json:"negative_delta,omitempty"`
+	NegativeCount []float64 `protobuf:"fixed64,11,rep,name=negative_count,json=negativeCount" json:"negative_count,omitempty"`
+	// Positive buckets for the native histogram.
+	PositiveSpan []*BucketSpan `protobuf:"bytes,12,rep,name=positive_span,json=positiveSpan" json:"positive_span,omitempty"`
+	// Use either "positive_delta" or "positive_count", the former for
+	// regular histograms with integer counts, the latter for float
+	// histograms.
+	PositiveDelta        []int64   `protobuf:"zigzag64,13,rep,name=positive_delta,json=positiveDelta" json:"positive_delta,omitempty"`
+	PositiveCount        []float64 `protobuf:"fixed64,14,rep,name=positive_count,json=positiveCount" json:"positive_count,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}  `json:"-"`
 	XXX_unrecognized     []byte    `json:"-"`
 	XXX_sizecache        int32     `json:"-"`
@@ -357,7 +391,7 @@ func (m *Histogram) Reset()         { *m = Histogram{} }
 func (m *Histogram) String() string { return proto.CompactTextString(m) }
 func (*Histogram) ProtoMessage()    {}
 func (*Histogram) Descriptor() ([]byte, []int) {
-	return fileDescriptor_6039342a2ba47b72, []int{6}
+	return fileDescriptor_d1e5ddb18987a258, []int{6}
 }
 
 func (m *Histogram) XXX_Unmarshal(b []byte) error {
@@ -385,6 +419,13 @@ func (m *Histogram) GetSampleCount() uint64 {
 	return 0
 }
 
+func (m *Histogram) GetSampleCountFloat() float64 {
+	if m != nil && m.SampleCountFloat != nil {
+		return *m.SampleCountFloat
+	}
+	return 0
+}
+
 func (m *Histogram) GetSampleSum() float64 {
 	if m != nil && m.SampleSum != nil {
 		return *m.SampleSum
@@ -399,8 +440,81 @@ func (m *Histogram) GetBucket() []*Bucket {
 	return nil
 }
 
+func (m *Histogram) GetSchema() int32 {
+	if m != nil && m.Schema != nil {
+		return *m.Schema
+	}
+	return 0
+}
+
+func (m *Histogram) GetZeroThreshold() float64 {
+	if m != nil && m.ZeroThreshold != nil {
+		return *m.ZeroThreshold
+	}
+	return 0
+}
+
+func (m *Histogram) GetZeroCount() uint64 {
+	if m != nil && m.ZeroCount != nil {
+		return *m.ZeroCount
+	}
+	return 0
+}
+
+func (m *Histogram) GetZeroCountFloat() float64 {
+	if m != nil && m.ZeroCountFloat != nil {
+		return *m.ZeroCountFloat
+	}
+	return 0
+}
+
+func (m *Histogram) GetNegativeSpan() []*BucketSpan {
+	if m != nil {
+		return m.NegativeSpan
+	}
+	return nil
+}
+
+func (m *Histogram) GetNegativeDelta() []int64 {
+	if m != nil {
+		return m.NegativeDelta
+	}
+	return nil
+}
+
+func (m *Histogram) GetNegativeCount() []float64 {
+	if m != nil {
+		return m.NegativeCount
+	}
+	return nil
+}
+
+func (m *Histogram) GetPositiveSpan() []*BucketSpan {
+	if m != nil {
+		return m.PositiveSpan
+	}
+	return nil
+}
+
+func (m *Histogram) GetPositiveDelta() []int64 {
+	if m != nil {
+		return m.PositiveDelta
+	}
+	return nil
+}
+
+func (m *Histogram) GetPositiveCount() []float64 {
+	if m != nil {
+		return m.PositiveCount
+	}
+	return nil
+}
+
+// A Bucket of a conventional histogram, each of which is treated as
+// an individual counter-like time series by Prometheus.
 type Bucket struct {
 	CumulativeCount      *uint64   `protobuf:"varint,1,opt,name=cumulative_count,json=cumulativeCount" json:"cumulative_count,omitempty"`
+	CumulativeCountFloat *float64  `protobuf:"fixed64,4,opt,name=cumulative_count_float,json=cumulativeCountFloat" json:"cumulative_count_float,omitempty"`
 	UpperBound           *float64  `protobuf:"fixed64,2,opt,name=upper_bound,json=upperBound" json:"upper_bound,omitempty"`
 	Exemplar             *Exemplar `protobuf:"bytes,3,opt,name=exemplar" json:"exemplar,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}  `json:"-"`
@@ -412,7 +526,7 @@ func (m *Bucket) Reset()         { *m = Bucket{} }
 func (m *Bucket) String() string { return proto.CompactTextString(m) }
 func (*Bucket) ProtoMessage()    {}
 func (*Bucket) Descriptor() ([]byte, []int) {
-	return fileDescriptor_6039342a2ba47b72, []int{7}
+	return fileDescriptor_d1e5ddb18987a258, []int{7}
 }
 
 func (m *Bucket) XXX_Unmarshal(b []byte) error {
@@ -440,6 +554,13 @@ func (m *Bucket) GetCumulativeCount() uint64 {
 	return 0
 }
 
+func (m *Bucket) GetCumulativeCountFloat() float64 {
+	if m != nil && m.CumulativeCountFloat != nil {
+		return *m.CumulativeCountFloat
+	}
+	return 0
+}
+
 func (m *Bucket) GetUpperBound() float64 {
 	if m != nil && m.UpperBound != nil {
 		return *m.UpperBound
@@ -454,6 +575,59 @@ func (m *Bucket) GetExemplar() *Exemplar {
 	return nil
 }
 
+// A BucketSpan defines a number of consecutive buckets in a native
+// histogram with their offset. Logically, it would be more
+// straightforward to include the bucket counts in the Span. However,
+// the protobuf representation is more compact in the way the data is
+// structured here (with all the buckets in a single array separate
+// from the Spans).
+type BucketSpan struct {
+	Offset               *int32   `protobuf:"zigzag32,1,opt,name=offset" json:"offset,omitempty"`
+	Length               *uint32  `protobuf:"varint,2,opt,name=length" json:"length,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *BucketSpan) Reset()         { *m = BucketSpan{} }
+func (m *BucketSpan) String() string { return proto.CompactTextString(m) }
+func (*BucketSpan) ProtoMessage()    {}
+func (*BucketSpan) Descriptor() ([]byte, []int) {
+	return fileDescriptor_d1e5ddb18987a258, []int{8}
+}
+
+func (m *BucketSpan) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_BucketSpan.Unmarshal(m, b)
+}
+func (m *BucketSpan) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_BucketSpan.Marshal(b, m, deterministic)
+}
+func (m *BucketSpan) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_BucketSpan.Merge(m, src)
+}
+func (m *BucketSpan) XXX_Size() int {
+	return xxx_messageInfo_BucketSpan.Size(m)
+}
+func (m *BucketSpan) XXX_DiscardUnknown() {
+	xxx_messageInfo_BucketSpan.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_BucketSpan proto.InternalMessageInfo
+
+func (m *BucketSpan) GetOffset() int32 {
+	if m != nil && m.Offset != nil {
+		return *m.Offset
+	}
+	return 0
+}
+
+func (m *BucketSpan) GetLength() uint32 {
+	if m != nil && m.Length != nil {
+		return *m.Length
+	}
+	return 0
+}
+
 type Exemplar struct {
 	Label                []*LabelPair         `protobuf:"bytes,1,rep,name=label" json:"label,omitempty"`
 	Value                *float64             `protobuf:"fixed64,2,opt,name=value" json:"value,omitempty"`
@@ -467,7 +641,7 @@ func (m *Exemplar) Reset()         { *m = Exemplar{} }
 func (m *Exemplar) String() string { return proto.CompactTextString(m) }
 func (*Exemplar) ProtoMessage()    {}
 func (*Exemplar) Descriptor() ([]byte, []int) {
-	return fileDescriptor_6039342a2ba47b72, []int{8}
+	return fileDescriptor_d1e5ddb18987a258, []int{9}
 }
 
 func (m *Exemplar) XXX_Unmarshal(b []byte) error {
@@ -526,7 +700,7 @@ func (m *Metric) Reset()         { *m = Metric{} }
 func (m *Metric) String() string { return proto.CompactTextString(m) }
 func (*Metric) ProtoMessage()    {}
 func (*Metric) Descriptor() ([]byte, []int) {
-	return fileDescriptor_6039342a2ba47b72, []int{9}
+	return fileDescriptor_d1e5ddb18987a258, []int{10}
 }
 
 func (m *Metric) XXX_Unmarshal(b []byte) error {
@@ -610,7 +784,7 @@ func (m *MetricFamily) Reset()         { *m = MetricFamily{} }
 func (m *MetricFamily) String() string { return proto.CompactTextString(m) }
 func (*MetricFamily) ProtoMessage()    {}
 func (*MetricFamily) Descriptor() ([]byte, []int) {
-	return fileDescriptor_6039342a2ba47b72, []int{10}
+	return fileDescriptor_d1e5ddb18987a258, []int{11}
 }
 
 func (m *MetricFamily) XXX_Unmarshal(b []byte) error {
@@ -669,55 +843,72 @@ func init() {
 	proto.RegisterType((*Untyped)(nil), "io.prometheus.client.Untyped")
 	proto.RegisterType((*Histogram)(nil), "io.prometheus.client.Histogram")
 	proto.RegisterType((*Bucket)(nil), "io.prometheus.client.Bucket")
+	proto.RegisterType((*BucketSpan)(nil), "io.prometheus.client.BucketSpan")
 	proto.RegisterType((*Exemplar)(nil), "io.prometheus.client.Exemplar")
 	proto.RegisterType((*Metric)(nil), "io.prometheus.client.Metric")
 	proto.RegisterType((*MetricFamily)(nil), "io.prometheus.client.MetricFamily")
 }
 
-func init() { proto.RegisterFile("metrics.proto", fileDescriptor_6039342a2ba47b72) }
-
-var fileDescriptor_6039342a2ba47b72 = []byte{
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+func init() {
+	proto.RegisterFile("io/prometheus/client/metrics.proto", fileDescriptor_d1e5ddb18987a258)
+}
+
+var fileDescriptor_d1e5ddb18987a258 = []byte{
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