import type { MetricLabels, MetricsSink, MetricsSnapshot } from '../types/observability.js';
/**
 * In-memory metrics sink. Suitable for embedded use, tests, and /metrics
 * scrape over HTTP. For production push-based pipelines, write an adapter
 * that implements MetricsSink and forwards to OTLP/StatsD/Prometheus.
 */
export declare class InMemoryMetricsSink implements MetricsSink {
    private counters;
    private gauges;
    private histograms;
    counter(name: string, value?: number, labels?: MetricLabels): void;
    gauge(name: string, value: number, labels?: MetricLabels): void;
    histogram(name: string, value: number, labels?: MetricLabels): void;
    snapshot(): MetricsSnapshot;
    reset(): void;
    private getOrCreate;
}
/** Cheap noop sink — drop-in default when observability is not configured. */
export declare class NoopMetricsSink implements MetricsSink {
    counter(): void;
    gauge(): void;
    histogram(): void;
    snapshot(): MetricsSnapshot;
    reset(): void;
}
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