vendor: github.com/prometheus/client_golang v1.12.1

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

vendor/go.opencensus.io/metric/metricdata/point.go

@@ -0,0 +1,193 @@
+// Copyright 2018, OpenCensus 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 metricdata
+
+import (
+	"time"
+)
+
+// Point is a single data point of a time series.
+type Point struct {
+	// Time is the point in time that this point represents in a time series.
+	Time time.Time
+	// Value is the value of this point. Prefer using ReadValue to switching on
+	// the value type, since new value types might be added.
+	Value interface{}
+}
+
+//go:generate stringer -type ValueType
+
+// NewFloat64Point creates a new Point holding a float64 value.
+func NewFloat64Point(t time.Time, val float64) Point {
+	return Point{
+		Value: val,
+		Time:  t,
+	}
+}
+
+// NewInt64Point creates a new Point holding an int64 value.
+func NewInt64Point(t time.Time, val int64) Point {
+	return Point{
+		Value: val,
+		Time:  t,
+	}
+}
+
+// NewDistributionPoint creates a new Point holding a Distribution value.
+func NewDistributionPoint(t time.Time, val *Distribution) Point {
+	return Point{
+		Value: val,
+		Time:  t,
+	}
+}
+
+// NewSummaryPoint creates a new Point holding a Summary value.
+func NewSummaryPoint(t time.Time, val *Summary) Point {
+	return Point{
+		Value: val,
+		Time:  t,
+	}
+}
+
+// ValueVisitor allows reading the value of a point.
+type ValueVisitor interface {
+	VisitFloat64Value(float64)
+	VisitInt64Value(int64)
+	VisitDistributionValue(*Distribution)
+	VisitSummaryValue(*Summary)
+}
+
+// ReadValue accepts a ValueVisitor and calls the appropriate method with the
+// value of this point.
+// Consumers of Point should use this in preference to switching on the type
+// of the value directly, since new value types may be added.
+func (p Point) ReadValue(vv ValueVisitor) {
+	switch v := p.Value.(type) {
+	case int64:
+		vv.VisitInt64Value(v)
+	case float64:
+		vv.VisitFloat64Value(v)
+	case *Distribution:
+		vv.VisitDistributionValue(v)
+	case *Summary:
+		vv.VisitSummaryValue(v)
+	default:
+		panic("unexpected value type")
+	}
+}
+
+// Distribution contains summary statistics for a population of values. It
+// optionally contains a histogram representing the distribution of those
+// values across a set of buckets.
+type Distribution struct {
+	// Count is the number of values in the population. Must be non-negative. This value
+	// must equal the sum of the values in bucket_counts if a histogram is
+	// provided.
+	Count int64
+	// Sum is the sum of the values in the population. If count is zero then this field
+	// must be zero.
+	Sum float64
+	// SumOfSquaredDeviation is the sum of squared deviations from the mean of the values in the
+	// population. For values x_i this is:
+	//
+	//     Sum[i=1..n]((x_i - mean)^2)
+	//
+	// Knuth, "The Art of Computer Programming", Vol. 2, page 323, 3rd edition
+	// describes Welford's method for accumulating this sum in one pass.
+	//
+	// If count is zero then this field must be zero.
+	SumOfSquaredDeviation float64
+	// BucketOptions describes the bounds of the histogram buckets in this
+	// distribution.
+	//
+	// A Distribution may optionally contain a histogram of the values in the
+	// population.
+	//
+	// If nil, there is no associated histogram.
+	BucketOptions *BucketOptions
+	// Bucket If the distribution does not have a histogram, then omit this field.
+	// If there is a histogram, then the sum of the values in the Bucket counts
+	// must equal the value in the count field of the distribution.
+	Buckets []Bucket
+}
+
+// BucketOptions describes the bounds of the histogram buckets in this
+// distribution.
+type BucketOptions struct {
+	// Bounds specifies a set of bucket upper bounds.
+	// This defines len(bounds) + 1 (= N) buckets. The boundaries for bucket
+	// index i are:
+	//
+	// [0, Bounds[i]) for i == 0
+	// [Bounds[i-1], Bounds[i]) for 0 < i < N-1
+	// [Bounds[i-1], +infinity) for i == N-1
+	Bounds []float64
+}
+
+// Bucket represents a single bucket (value range) in a distribution.
+type Bucket struct {
+	// Count is the number of values in each bucket of the histogram, as described in
+	// bucket_bounds.
+	Count int64
+	// Exemplar associated with this bucket (if any).
+	Exemplar *Exemplar
+}
+
+// Summary is a representation of percentiles.
+type Summary struct {
+	// Count is the cumulative count (if available).
+	Count int64
+	// Sum is the cumulative sum of values  (if available).
+	Sum float64
+	// HasCountAndSum is true if Count and Sum are available.
+	HasCountAndSum bool
+	// Snapshot represents percentiles calculated over an arbitrary time window.
+	// The values in this struct can be reset at arbitrary unknown times, with
+	// the requirement that all of them are reset at the same time.
+	Snapshot Snapshot
+}
+
+// Snapshot represents percentiles over an arbitrary time.
+// The values in this struct can be reset at arbitrary unknown times, with
+// the requirement that all of them are reset at the same time.
+type Snapshot struct {
+	// Count is the number of values in the snapshot. Optional since some systems don't
+	// expose this. Set to 0 if not available.
+	Count int64
+	// Sum is the sum of values in the snapshot. Optional since some systems don't
+	// expose this. If count is 0 then this field must be zero.
+	Sum float64
+	// Percentiles is a map from percentile (range (0-100.0]) to the value of
+	// the percentile.
+	Percentiles map[float64]float64
+}
+
+//go:generate stringer -type Type
+
+// Type is the overall type of metric, including its value type and whether it
+// represents a cumulative total (since the start time) or if it represents a
+// gauge value.
+type Type int
+
+// Metric types.
+const (
+	TypeGaugeInt64 Type = iota
+	TypeGaugeFloat64
+	TypeGaugeDistribution
+	TypeCumulativeInt64
+	TypeCumulativeFloat64
+	TypeCumulativeDistribution
+	TypeSummary
+)