import { AttributeType } from '../../../model/data/BacktraceData.js';
export declare class MetricsEvent<V extends string | string[] = string | string[]> {
    readonly metricGroupName: string;
    readonly metricGroupValue: V;
    readonly attributes: Record<string, AttributeType>;
    readonly id: string;
    constructor(metricGroupName: string, metricGroupValue: V, attributes?: Record<string, AttributeType>);
    toJSON(): {
        [x: string]: number | Record<string, AttributeType> | V;
        timestamp: number;
        attributes: Record<string, AttributeType>;
    };
}