@libp2p/prometheus-metrics/dist/src/histogram.js

Collect libp2p metrics for scraping by Prometheus or Graphana

import { Histogram as PromHistogram } from 'prom-client';
import { normalizeString } from './utils.js';
export class PrometheusHistogram {
    histogram;
    constructor(name, opts) {
        name = normalizeString(name);
        const help = normalizeString(opts.help ?? name);
        const labels = opts.label != null ? [normalizeString(opts.label)] : [];
        let collect;
        // calculated metric
        if (opts?.calculate != null) {
            collect = async function () {
                this.observe(await opts.calculate());
            };
        }
        this.histogram = new PromHistogram({
            name,
            help,
            buckets: opts.buckets ?? [0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1, 2.5, 5, 10],
            labelNames: labels,
            registers: opts.registry !== undefined ? [opts.registry] : undefined,
            collect
        });
    }
    observe(value) {
        this.histogram.observe(value);
    }
    reset() {
        this.histogram.reset();
    }
    timer() {
        return this.histogram.startTimer();
    }
}
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