app.js

const { PrometheusExporter } = require('@opentelemetry/exporter-prometheus');
const { MeterProvider }  = require('@opentelemetry/metrics');
const { Resource }  = require('@opentelemetry/resources');


// Add your port and startServer to the Prometheus options
const options = {port: 9464, startServer: true};
const exporter = new PrometheusExporter(options);


const resource = new Resource({
  'k8s.io/container/name': 'c1',
  'k8s.io/namespace/name': 'default',
  'k8s.io/pod/name': 'pod-xyz-123',
});

// Register the exporter
const meter = new MeterProvider({
  exporter,
  interval: 1000,
  resource: resource
}).getMeter('example-prometheus');

// Now, start recording data
const counter = meter.createCounter('metric_name', {
  labelKeys: ['pid', 'k8s.io/container/name'], // <= throws new Error('Invalid label name');
  description: 'Example of a counter'
});
counter.add(10, { pid: process.pid });

// Record data using Instrument: It is recommended to keep a reference to the Bound Instrument instead of
// always calling `bind()` method for every operations.
const boundCounter = counter.bind({ pid: process.pid });
boundCounter.add(10);

console.log("started server at :9464")