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index.js
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index.js
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'use strict';
const { DiagConsoleLogger, DiagLogLevel, diag } = require('@opentelemetry/api');
const { CollectorMetricExporter } = require('@opentelemetry/exporter-collector');
const { MeterProvider } = require('@opentelemetry/metrics');
const { Resource } = require('@opentelemetry/resources');
const { ResourceAttributes } = require('@opentelemetry/semantic-conventions');
// Optional and only needed to see the internal diagnostic logging (during development)
diag.setLogger(new DiagConsoleLogger(), DiagLogLevel.DEBUG);
const metricExporter = new CollectorMetricExporter();
let interval;
let meter;
function stopMetrics() {
console.log('STOPPING METRICS');
clearInterval(interval);
meter.shutdown();
}
function startMetrics() {
console.log('STARTING METRICS');
meter = new MeterProvider({
exporter: metricExporter,
interval: 1000,
resource: new Resource({
[ResourceAttributes.SERVICE_NAME]: 'basic-metric-service',
}),
}).getMeter('example-exporter-collector');
const requestCounter = meter.createCounter('requests', {
description: 'Example of a Counter',
});
const upDownCounter = meter.createUpDownCounter('test_up_down_counter', {
description: 'Example of a UpDownCounter',
});
const labels = { pid: process.pid, environment: 'staging' };
interval = setInterval(() => {
requestCounter.bind(labels).add(1);
upDownCounter.bind(labels).add(Math.random() > 0.5 ? 1 : -1);
}, 1000);
}
const addClickEvents = () => {
const startBtn = document.getElementById('startBtn');
const stopBtn = document.getElementById('stopBtn');
startBtn.addEventListener('click', startMetrics);
stopBtn.addEventListener('click', stopMetrics);
};
window.addEventListener('load', addClickEvents);