frostfs-node/pkg/metrics/desc.go

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package metrics
import (
"github.com/prometheus/client_golang/prometheus"
dto "github.com/prometheus/client_model/go"
)
type metric[T prometheus.Collector] struct {
value T
desc Description
}
// Descriptions contains metric description suitable for further processing.
// The only reason for it to exist is `prometheus.Desc` disallowing field access directly.
// https://github.com/prometheus/client_golang/pull/326
// https://github.com/prometheus/client_golang/issues/516
// https://github.com/prometheus/client_golang/issues/222
type Description struct {
Name string `json:"name"`
Help string `json:"help"`
Type string `json:"type"`
ConstantLabels prometheus.Labels `json:"constant_labels,omitempty"`
VariableLabels []string `json:"variable_labels,omitempty"`
}
func newGauge(opts prometheus.GaugeOpts) metric[prometheus.Gauge] {
return metric[prometheus.Gauge]{
value: prometheus.NewGauge(opts),
desc: Description{
Name: prometheus.BuildFQName(opts.Namespace, opts.Subsystem, opts.Name),
Type: dto.MetricType_GAUGE.String(),
Help: opts.Help,
ConstantLabels: opts.ConstLabels,
},
}
}
func newGaugeVec(opts prometheus.GaugeOpts, labelNames []string) metric[*prometheus.GaugeVec] {
return metric[*prometheus.GaugeVec]{
value: prometheus.NewGaugeVec(opts, labelNames),
desc: Description{
Name: prometheus.BuildFQName(opts.Namespace, opts.Subsystem, opts.Name),
Type: dto.MetricType_GAUGE.String(),
Help: opts.Help,
ConstantLabels: opts.ConstLabels,
VariableLabels: labelNames,
},
}
}
func newCounter(opts prometheus.CounterOpts) metric[prometheus.Counter] {
return metric[prometheus.Counter]{
value: prometheus.NewCounter(opts),
desc: Description{
Name: prometheus.BuildFQName(opts.Namespace, opts.Subsystem, opts.Name),
Type: dto.MetricType_COUNTER.String(),
Help: opts.Help,
ConstantLabels: opts.ConstLabels,
},
}
}
// DescribeAll returns descriptions for all registered metrics.
func DescribeAll() ([]Description, error) {
registeredDescriptionsMtx.Lock()
defer registeredDescriptionsMtx.Unlock()
ds := make([]Description, len(registeredDescriptions))
copy(ds, registeredDescriptions)
return ds, nil
}