express prometheus bundle

express middleware with popular prometheus metrics in one bundle.

Internally it uses prom-client. See: https://github.com/siimon/prom-client

Included metrics:

• up: normally is just 1
• nodejs_memory_heap_total_bytes and nodejs_memory_heap_used_bytes
• http_request_seconds: http latency histogram labeled with status_code

Install

npm install express-prom-bundle

Usage

const
    promBundle = require("express-prom-bundle"),
    middleware = promBundle({/* options */ });

Options

• prefix: prefix added to every metric name
• whitelist, blacklist: array of strings or regexp. These which metrics to include/exclude

Example

"use strict";

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

app.use(promBundle({
    prefix: "demo_app:something",
    blacklist: ["up"]
}));

app.get("/hello", (req, res) => res.send("ok"));

app.listen(3000);

License

MIT