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

Collect libp2p metrics for scraping by Prometheus or Graphana

import { Histogram as PromHistogram } from 'prom-client';
import { normalizeString } from './utils.js';
export class PrometheusHistogramGroup {
    histogram;
    label;
    constructor(name, opts) {
        name = normalizeString(name);
        const help = normalizeString(opts.help ?? name);
        const label = this.label = normalizeString(opts.label ?? name);
        let collect;
        // calculated metric
        if (opts?.calculate != null) {
            collect = async function () {
                const values = await opts.calculate();
                Object.entries(values).forEach(([key, value]) => {
                    this.observe({ [label]: key }, value);
                });
            };
        }
        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: [this.label],
            registers: opts.registry !== undefined ? [opts.registry] : undefined,
            collect
        });
    }
    observe(values) {
        Object.entries(values).forEach(([key, value]) => {
            this.histogram.observe({ [this.label]: key }, value);
        });
    }
    reset() {
        this.histogram.reset();
    }
    timer(key) {
        return this.histogram.startTimer({
            [key]: 0
        });
    }
}
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