@libp2p/prometheus-metrics
Version:
Collect libp2p metrics for scraping by Prometheus or Graphana
47 lines • 1.59 kB
JavaScript
import { Summary as PromSummary } from 'prom-client';
import { normalizeString } from './utils.js';
export class PrometheusSummaryGroup {
summary;
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.summary = new PromSummary({
name,
help,
percentiles: opts.percentiles ?? [0.01, 0.05, 0.5, 0.9, 0.95, 0.99, 0.999],
maxAgeSeconds: opts.maxAgeSeconds,
ageBuckets: opts.ageBuckets,
pruneAgedBuckets: opts.pruneAgedBuckets,
compressCount: opts.compressCount ?? 1000,
labelNames: [this.label],
registers: opts.registry !== undefined ? [opts.registry] : undefined,
collect
});
}
observe(values) {
Object.entries(values).forEach(([key, value]) => {
this.summary.observe({ [this.label]: key }, value);
});
}
reset() {
this.summary.reset();
}
timer(key) {
return this.summary.startTimer({
[key]: 0
});
}
}
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