export interface Timing {
    count: number;
    totalMs: number;
    maxMs: number;
}
export declare class Metrics {
    #private;
    inc(name: string, by?: number): void;
    observe(name: string, ms: number): void;
    /** Time an async operation, recording its duration under `name`. */
    time<T>(name: string, fn: () => Promise<T>): Promise<T>;
    snapshot(): {
        counters: Record<string, number>;
        timings: Record<string, Timing & {
            avgMs: number;
        }>;
    };
    reset(): void;
}
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