prometheus-middleware

Prometheus middleware supports only gorilla/mux.

Installation

go get -u github.com/albertogviana/prometheus-middleware

What you will get

You will get:

• the HTTP request duration in seconds (http_request_duration_seconds) histogram partitioned by status code, method and HTTP path.

...
# HELP http_request_duration_seconds How long it took to process the request, partitioned by status code, method and HTTP path.
# TYPE http_request_duration_seconds histogram
http_request_duration_seconds_bucket{code="200",method="get",path="/",le="0.3"} 2
http_request_duration_seconds_bucket{code="200",method="get",path="/",le="1"} 2
http_request_duration_seconds_bucket{code="200",method="get",path="/",le="2.5"} 2
http_request_duration_seconds_bucket{code="200",method="get",path="/",le="5"} 2
http_request_duration_seconds_bucket{code="200",method="get",path="/",le="+Inf"} 2
http_request_duration_seconds_sum{code="200",method="get",path="/"} 3.5256e-05
http_request_duration_seconds_count{code="200",method="get",path="/"} 2
http_request_duration_seconds_bucket{code="200",method="get",path="/metrics",le="0.3"} 2
http_request_duration_seconds_bucket{code="200",method="get",path="/metrics",le="1"} 2
http_request_duration_seconds_bucket{code="200",method="get",path="/metrics",le="2.5"} 2
http_request_duration_seconds_bucket{code="200",method="get",path="/metrics",le="5"} 2
http_request_duration_seconds_bucket{code="200",method="get",path="/metrics",le="+Inf"} 2
http_request_duration_seconds_sum{code="200",method="get",path="/metrics"} 0.001261767
http_request_duration_seconds_count{code="200",method="get",path="/metrics"} 2
...

• HTTP request total (http_requests_total) partitioned by status code, method, and HTTP path.

...
# HELP http_requests_total How many HTTP requests processed, partitioned by status code, method and HTTP path.
# TYPE http_requests_total counter
http_requests_total{code="200",method="get",path="/"} 2
http_requests_total{code="200",method="get",path="/metrics"} 2
...

How to use it

• Gorilla/Mux

middleware := NewPrometheusMiddleware(Opts{})

r := mux.NewRouter()
r.Handle("/metrics", promhttp.Handler())
r.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
    w.WriteHeader(http.StatusOK)
    fmt.Fprintln(w, "ok")
})

r.Use(middleware.InstrumentHandlerDuration)