micro/metrics/prometheus/metrics.go

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package prometheus
import (
"errors"
"time"
"github.com/unistack-org/micro/v3/metrics"
)
// ErrPrometheusPanic is a catch-all for the panics which can be thrown by the Prometheus client:
var ErrPrometheusPanic = errors.New("The Prometheus client panicked. Did you do something like change the tag cardinality or the type of a metric?")
// Count is a counter with key/value tags:
// New values are added to any previous one (eg "number of hits")
func (r *Reporter) Count(name string, value int64, tags metrics.Tags) (err error) {
defer func() {
if r := recover(); r != nil {
err = ErrPrometheusPanic
}
}()
counter := r.metrics.getCounter(r.stripUnsupportedCharacters(name), r.listTagKeys(tags))
metric, err := counter.GetMetricWith(r.convertTags(tags))
if err != nil {
return err
}
metric.Add(float64(value))
return err
}
// Gauge is a register with key/value tags:
// New values simply override any previous one (eg "current connections")
func (r *Reporter) Gauge(name string, value float64, tags metrics.Tags) (err error) {
defer func() {
if r := recover(); r != nil {
err = ErrPrometheusPanic
}
}()
gauge := r.metrics.getGauge(r.stripUnsupportedCharacters(name), r.listTagKeys(tags))
metric, err := gauge.GetMetricWith(r.convertTags(tags))
if err != nil {
return err
}
metric.Set(value)
return err
}
// Timing is a histogram with key/valye tags:
// New values are added into a series of aggregations
func (r *Reporter) Timing(name string, value time.Duration, tags metrics.Tags) (err error) {
defer func() {
if r := recover(); r != nil {
err = ErrPrometheusPanic
}
}()
timing := r.metrics.getTiming(r.stripUnsupportedCharacters(name), r.listTagKeys(tags))
metric, err := timing.GetMetricWith(r.convertTags(tags))
if err != nil {
return err
}
metric.Observe(value.Seconds())
return err
}