import { Tags } from 'hot-shots';
import winston = require('winston');
export declare enum MetricsType {
    GAUGE = "gauge",
    INCREMENT = "increment"
}
export interface InitOptions {
    /**
     * interval to send stats to datadog in ms (default = 10 minutes)
     */
    timerInMs?: number;
    /**
     * Used to init or not the stats client.
     * When running production, NODE_ENV should be "production".
     * If running tests, NODE_ENV should be "development".
     */
    environment?: string | undefined;
    /**
     * An optional logger to send Metrics into logs (in debug mode)
     */
    logger?: winston.Logger;
}
export interface addOrUpdateMetricsOptions {
    /**
     * @example
     * ```
     * declare your metrics, their types, value and optionals tags.
     * {metrics: {processed_users: { type: MetricsType.GAUGE, value: 4, tags: {datamart_id: '4521'}}, users_with_mobile_id_count: {type: MetricsType.INCREMENT, value: 1, tags: {datamart_id: '4521'}}}}
     * {processed_users: 4}
     */
    metrics: {
        [metricName: string]: MetricOptions;
    };
}
export interface MetricOptions {
    type: MetricsType;
    value: number;
    tags?: Tags;
}
export type MetricsSet = Map<string, MetricsOptionsWithName>;
export interface MetricsOptionsWithName extends MetricOptions {
    metricName: string;
}
/**
 * Send stats to datadog
 */
export declare class StatsClient {
    private static instance;
    private interval;
    private metrics;
    private client;
    private constructor();
    /**
     * @example
     * ```
     * private this.statsClient: StatsClient
     * constructor() {
     *   this.statsClient = StatsClient.init({ environment: process.env.NODE_ENV });
     * }
     * ```
     */
    static init({ timerInMs, environment, logger }: InitOptions): StatsClient;
    /**
     * Increment some metrics
     * @example
     * ```
     * this.statClient.addOrUpdateMetrics({metrics: {processed_users: { type: MetricsType.GAUGE, value: 4, tags: {datamart_id: '4521'}}, users_with_mobile_id_count: {type: MetricsType.INCREMENT, value: 1, tags: {datamart_id: '4521'}}}})
     * this.statClient.addOrUpdateMetrics({metrics: {apiCallsError: { type: MetricsType.GAUGE, value: 10, tags: {statusCode: '500'}}}})
     * ```
     */
    addOrUpdateMetrics({ metrics }: addOrUpdateMetricsOptions): void;
    private sendStats;
    private resetIncrementMetric;
}