sqlstats

sqlstats

A Go library for collecting sql.DBStats and exporting them in Prometheus format.

A sql.DB object represents a pool of zero or more underlying connections that get created and freed automatically. Connections in the pool may also be idle. There are a few settings (SetMaxOpenConns(), SetMaxIdleConns() and SetConnMaxLifetime()) that can be used to control the pool of connections. This library exposes stats about this pool in Prometheus format, to aid with understanding of the pool.

Installation

go get github.com/dlmiddlecote/sqlstats

Example

package main

import (
	"database/sql"
	"net/http"

	_ "github.com/lib/pq"
	"github.com/dlmiddlecote/sqlstats"
	"github.com/prometheus/client_golang/prometheus"
	"github.com/prometheus/client_golang/prometheus/promhttp"
)

func main() {
	if err := run(); err != nil {
		panic(err)
	}
}

func run() error {
	// Open connection to a DB (could also use the https://github.com/jmoiron/sqlx library)
	db, err := sql.Open("postgres", "postgres://postgres:postgres@localhost:5432/postgres")
	if err != nil {
		return err
	}

	// Create a new collector, the name will be used as a label on the metrics
	collector := sqlstats.NewStatsCollector("db_name", db)

	// Register it with Prometheus
	prometheus.MustRegister(collector)

	// Register the metrics handler
	http.Handle("/metrics", promhttp.Handler())

	// Run the web server
	return http.ListenAndServe(":8080", nil)
}

Exposed Metrics