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// SPDX-License-Identifier: GPL-3.0-or-later
package metrics
import (
"math"
"github.com/netdata/netdata/go/go.d.plugin/pkg/stm"
)
type (
// A Summary captures individual observations from an event or sample stream and
// summarizes them in a manner similar to traditional summary statistics:
// sum of observations
// observation count
// observation average.
//
// To create summary instances, use NewSummary.
Summary interface {
Observer
Reset()
}
// SummaryVec is a Collector that bundles a set of Summary which have different values for their names.
// This is used if you want to count the same thing partitioned by various dimensions
// (e.g. number of HTTP response time, partitioned by response code and method).
//
// Create instances with NewSummaryVec.
SummaryVec map[string]Summary
summary struct {
min float64
max float64
sum float64
count int64
}
)
var (
_ stm.Value = summary{}
_ stm.Value = SummaryVec{}
)
// NewSummary creates a new Summary.
func NewSummary() Summary {
return &summary{
min: math.MaxFloat64,
max: -math.MaxFloat64,
}
}
// WriteTo writes its values into given map.
// It adds those key-value pairs:
//
// ${key}_sum gauge, for sum of it's observed values from last Reset calls
// ${key}_count counter, for count of it's observed values from last Reset calls
// ${key}_min gauge, for min of it's observed values from last Reset calls (only exists if count > 0)
// ${key}_max gauge, for max of it's observed values from last Reset calls (only exists if count > 0)
// ${key}_avg gauge, for avg of it's observed values from last Reset calls (only exists if count > 0)
func (s summary) WriteTo(rv map[string]int64, key string, mul, div int) {
if s.count > 0 {
rv[key+"_min"] = int64(s.min * float64(mul) / float64(div))
rv[key+"_max"] = int64(s.max * float64(mul) / float64(div))
rv[key+"_sum"] = int64(s.sum * float64(mul) / float64(div))
rv[key+"_count"] = s.count
rv[key+"_avg"] = int64(s.sum / float64(s.count) * float64(mul) / float64(div))
} else {
rv[key+"_count"] = 0
rv[key+"_sum"] = 0
delete(rv, key+"_min")
delete(rv, key+"_max")
delete(rv, key+"_avg")
}
}
// Reset resets all of its counters.
// Call it before every scrape loop.
func (s *summary) Reset() {
s.min = math.MaxFloat64
s.max = -math.MaxFloat64
s.sum = 0
s.count = 0
}
// Observe observes a value
func (s *summary) Observe(v float64) {
if v > s.max {
s.max = v
}
if v < s.min {
s.min = v
}
s.sum += v
s.count++
}
// NewSummaryVec creates a new SummaryVec instance.
func NewSummaryVec() SummaryVec {
return SummaryVec{}
}
// WriteTo writes its value into given map.
func (c SummaryVec) WriteTo(rv map[string]int64, key string, mul, div int) {
for name, value := range c {
value.WriteTo(rv, key+"_"+name, mul, div)
}
}
// Get gets counter instance by name.
func (c SummaryVec) Get(name string) Summary {
item, ok := c[name]
if ok {
return item
}
item = NewSummary()
c[name] = item
return item
}
// Reset resets its all summaries.
func (c SummaryVec) Reset() {
for _, value := range c {
value.Reset()
}
}
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