import { Metric } from '../index';
export declare namespace Histogram {
    interface Options {
        percentiles?: number[];
        binEdges?: number[];
    }
    interface Fields {
        [key: string]: number;
    }
}
export declare class Histogram implements Metric {
    private options;
    private inited;
    private reservoir;
    constructor();
    _init(options?: Histogram.Options): void;
    record(value: number): void;
    _read(): Histogram.Fields | undefined;
    /**
     * @returns `true` on first inited, `false` if it has already been inited before
     */
    protected init(): boolean;
}