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

Collect libp2p metrics for scraping by Prometheus or Graphana

import { Counter as PromCounter } from 'prom-client';
import { normalizeString } from './utils.js';
export class PrometheusCounterGroup {
    counter;
    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.inc({ [label]: key }, value);
                });
            };
        }
        this.counter = new PromCounter({
            name,
            help,
            labelNames: [this.label],
            registers: opts.registry !== undefined ? [opts.registry] : undefined,
            collect
        });
    }
    increment(values) {
        Object.entries(values).forEach(([key, value]) => {
            const inc = typeof value === 'number' ? value : 1;
            this.counter.inc({ [this.label]: key }, inc);
        });
    }
    reset() {
        this.counter.reset();
    }
}
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