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README.md: added usage section

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Aliaksandr Valialkin 2019-04-08 16:37:53 +03:00
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@ -19,6 +19,30 @@
* It doesn't implement advanced functionality from [github.com/prometheus/client_golang/prometheus](https://godoc.org/github.com/prometheus/client_golang/prometheus).
### Usage
```go
var (
requestsTotal = metrics.NewCounter("requests_total")
queueSize = metrics.NewGauge(`queue_size{queue="foobar"}`, func() float64 {
return float64(foobarQueue.Len())
})
requestDuration = metrics.NewSummary(`requests_duration_seconds{handler="/my/super/handler"}`)
)
func requestHandler() {
startTime := time.Now()
...
requestsTotal.Inc()
requestDuration.UpdateDuration(startTime)
}
```
See [docs](http://godoc.org/github.com/VictoriaMetrics/metrics) for more info.
### Users
* `Metrics` has been extracted from [VictoriaMetrics](https://github.com/VictoriaMetrics/VictoriaMetrics) sources.