prometheus

Documentation

Overview

Package prometheus contains a Prometheus exporter that supports exporting OpenCensus views as Prometheus metrics.

Example

package main

import (
	"log"
	"net/http"

	"go.opencensus.io/exporter/prometheus"
	"go.opencensus.io/stats/view"
)

func main() {
	exporter, err := prometheus.NewExporter(prometheus.Options{})
	if err != nil {
		log.Fatal(err)
	}
	view.RegisterExporter(exporter)

	// Serve the scrape endpoint on port 9999.
	http.Handle("/metrics", exporter)
	log.Fatal(http.ListenAndServe(":9999", nil))
}

Index

• type Exporter
  • func NewExporter(o Options) (*Exporter, error)
  • func (e *Exporter) ExportView(vd *view.Data)
  • func (e *Exporter) ServeHTTP(w http.ResponseWriter, r *http.Request)
• type Options

Examples

• Package

Types

type Exporter

type Exporter struct {
	// contains filtered or unexported fields
}

Exporter exports stats to Prometheus, users need to register the exporter as an http.Handler to be able to export.

func NewExporter

func NewExporter(o Options) (*Exporter, error)

NewExporter returns an exporter that exports stats to Prometheus.

func (*Exporter) ExportView

func (e *Exporter) ExportView(vd *view.Data)

ExportView exports to the Prometheus if view data has one or more rows. Each OpenCensus AggregationData will be converted to corresponding Prometheus Metric: SumData will be converted to Untyped Metric, CountData will be a Counter Metric, DistributionData will be a Histogram Metric.

func (*Exporter) ServeHTTP

func (e *Exporter) ServeHTTP(w http.ResponseWriter, r *http.Request)

ServeHTTP serves the Prometheus endpoint.

type Options

type Options struct {
	Namespace   string
	Registry    *prometheus.Registry
	OnError     func(err error)
	ConstLabels prometheus.Labels // ConstLabels will be set as labels on all views.
}

Options contains options for configuring the exporter.