@dudousxd/nestjs-telescope/dist/config/sampling.d.ts

Laravel Telescope-style observability console for NestJS — core: watchers, recorder, correlation, SQLite store, headless API.

import type { RecordInput } from '../entry/entry.js';
import type { SamplingConfig } from './options.js';
/**
 * Pragmatic, cheap structural error check used by tail-sampling's `keepErrors`.
 * Reads only shallow, already-present fields — no deep walk — so it stays on the
 * hot path. An entry "looks like an error" when:
 *  - its `tags` include `'failed'`, OR
 *  - `content.failed === true`, OR
 *  - `content.statusCode >= 500`, OR
 *  - `content.level` is `'warn'`, `'error'`, or `'fatal'` (a Log entry) — so a
 *    host can sample logs aggressively (`{ log: { rate: 0.1, keepErrors: true } }`)
 *    yet never drop a warning or error line.
 */
export declare function isErrorEntry(input: RecordInput): boolean;
/**
 * Projects a {@link SamplingConfig} down to bare per-type keep-rates for the
 * meta/dashboard contract, which only surfaces the headline rate. Keeps the
 * wire shape `Record<string, number>` stable so existing consumers (the UI's
 * `samplingNote`) don't need to learn about tail-sampling rule objects.
 */
export declare function samplingRates(sampling: SamplingConfig): Record<string, number>;
/**
 * Tail-sampling decision for one input. Plain-number per-type config behaves
 * exactly as a uniform keep-rate. A {@link SamplingRule} additionally always
 * keeps errors (`keepErrors`) and slow entries (`durationMs >= keepSlowMs`)
 * before falling back to the base rate. `random` is the injected 0–1 source.
 */
export declare function passesSampling(sampling: SamplingConfig, input: RecordInput, random: () => number): boolean;
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