fasthttp prometheus-middleware

Prometheus middleware for fasthttp

Exports metrics for request duration request_duration_seconds with http status code as code and http request method + endpoint/route as path f.e code="200",path="GET_/health", code="201",path="POST_/foo"

Example

using fasthttp/router

package main

import (
"log"

fasthttpprom "github.com/carousell/fasthttp-prometheus-middleware"
"github.com/fasthttp/router"
"github.com/valyala/fasthttp"
)

func main() {

	r := router.New()
	p := fasthttpprom.NewPrometheus("")
	p.Use(r)

	r.GET("/health", func(ctx *fasthttp.RequestCtx) {
		ctx.SetStatusCode(200)
		ctx.SetBody([]byte(`{"status": "pass"}`))
		log.Println(string(ctx.Request.URI().Path()))
	})

	log.Println("main is listening on ", "8080")
	log.Fatal(fasthttp.ListenAndServe(":"+"8080", p.Handler))

}

Example metrics for above code in /metrics endpoint

request_duration_seconds_bucket{code="200",path="GET_/health",le="0.01"} 25063
request_duration_seconds_bucket{code="200",path="GET_/health",le="0.02"} 25063
request_duration_seconds_bucket{code="200",path="GET_/health",le="0.04"} 25063
request_duration_seconds_bucket{code="200",path="GET_/health",le="0.06"} 25063
request_duration_seconds_bucket{code="200",path="GET_/health",le="0.08"} 25063
request_duration_seconds_bucket{code="200",path="GET_/health",le="0.1"} 25063
request_duration_seconds_bucket{code="200",path="GET_/health",le="0.15"} 25063
request_duration_seconds_bucket{code="200",path="GET_/health",le="0.25"} 25063
request_duration_seconds_bucket{code="200",path="GET_/health",le="0.4"} 25063
request_duration_seconds_bucket{code="200",path="GET_/health",le="0.6"} 25063
request_duration_seconds_bucket{code="200",path="GET_/health",le="0.8"} 25063
request_duration_seconds_bucket{code="200",path="GET_/health",le="1"} 25063
request_duration_seconds_bucket{code="200",path="GET_/health",le="1.5"} 25063
request_duration_seconds_bucket{code="200",path="GET_/health",le="2"} 25063
request_duration_seconds_bucket{code="200",path="GET_/health",le="3"} 25063
request_duration_seconds_bucket{code="200",path="GET_/health",le="5"} 25063
request_duration_seconds_bucket{code="200",path="GET_/health",le="+Inf"} 25063
request_duration_seconds_sum{code="200",path="GET_/health"} 0.14781658099999923
request_duration_seconds_count{code="200",path="GET_/health"} 25063