import { IStat } from "../model/IStat";
import { ITags } from "../model/ITags";
import { StatsReporter } from "./StatsReporter";
export declare class StatsManager {
    static readonly samplePeriodMs: number;
    private buffer;
    private reporters;
    private flushInterval;
    private tags;
    constructor(config?: {
        tags?: ITags;
    });
    shutdown(): Promise<void>;
    /**
     * Aggregates a value into the IStat record at key.
     */
    aggregate(metric: string, value: number | IStat, tags?: ITags): void;
    /**
     * Aggregates 1 into the IStat record at key.
     */
    increment(metric: string, tags?: ITags): void;
    /**
     * Times a function call and the promise it produces.
     * The timing statistic is only recorded if the function
     * returns without an exception.
     */
    timer<T>(metric: string, f: () => Promise<T>, tags?: ITags): Promise<T>;
    /**
     * Register a reporter.
     */
    registerStatsReporter(statsReporter: StatsReporter): void;
    setTag(key: string, value: string): void;
    private addToBuffer;
    private write;
    private flushStats;
    private encodeKey;
    private decodeKey;
    private filterTags;
}