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

Collect libp2p metrics for scraping by Prometheus or Graphana

import { Gauge } from 'prom-client';
import { normalizeString } from './utils.js';
export class PrometheusMetricGroup {
    gauge;
    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.set({ [label]: key }, value);
                });
            };
        }
        this.gauge = new Gauge({
            name,
            help,
            labelNames: [this.label],
            registers: opts.registry !== undefined ? [opts.registry] : undefined,
            collect
        });
    }
    update(values) {
        Object.entries(values).forEach(([key, value]) => {
            this.gauge.set({ [this.label]: key }, value);
        });
    }
    increment(values) {
        Object.entries(values).forEach(([key, value]) => {
            const inc = typeof value === 'number' ? value : 1;
            this.gauge.inc({ [this.label]: key }, inc);
        });
    }
    decrement(values) {
        Object.entries(values).forEach(([key, value]) => {
            const dec = typeof value === 'number' ? value : 1;
            this.gauge.dec({ [this.label]: key }, dec);
        });
    }
    reset() {
        this.gauge.reset();
    }
    timer(key) {
        return this.gauge.startTimer({
            [this.label]: key
        });
    }
}
//# sourceMappingURL=metric-group.js.map