express-prom-bundle/advanced-example.js

"use strict";

const express = require("express");
const app = express();
const promBundle = require("express-prom-bundle");

const bundle = promBundle({
    prefix: "demo_app:something:",
    blacklist: [/up/],
    buckets: [0.1, 0.4, 0.7]
});

app.use(bundle);

// native prom-client metric (no prefix)
const c1 = new bundle.promClient.Counter("c1", "c1 help");
c1.inc(10);

// create metric using factory (w/ prefix)
const c2 = bundle.factory.newCounter("c2", "c2 help");
c2.inc(20);

app.get("/foo", (req, res) => {
    setTimeout(() => {
        res.send("foo response\n");
    }, 500);
});
app.get("/bar", (req, res) => res.send("bar response\n"));

app.listen(3000, () => console.log("listening on 3000")); // eslint-disable-line

/*
test in shell console:

curl localhost:3000/foo
curl localhost:3000/bar
curl localhost:3000/metrics
*/