import { Context } from '../ioc/Context';
export interface LabelValues {
    [key: string]: string | number;
}
/**
 * A counter is a cumulative metric that represents a single numerical value that only ever goes up
 */
export interface Counter {
    /**
     * Increment for given labels
     * @param labels Object with label keys and values
     * @param value The number to increment with
     */
    inc(labels: LabelValues, value?: number): void;
    /**
     * Increment with value
     * @param value The value to increment with
     */
    inc(value?: number): void;
}
export interface Gauge {
    /**
     * Increment gauge for given labels
     * @param labels Object with label keys and values
     * @param value The value to increment with
     */
    inc(labels: LabelValues, value?: number): void;
    /**
     * Increment gauge
     * @param value The value to increment with
     */
    inc(value?: number): void;
    /**
     * Decrement gauge
     * @param labels Object with label keys and values
     * @param value Value to decrement with
     */
    dec(labels: LabelValues, value?: number): void;
    /**
     * Decrement gauge
     * @param value The value to decrement with
     */
    dec(value?: number): void;
    /**
     * Set gauge value for labels
     * @param lables Object with label keys and values
     * @param value The value to set
     */
    set(labels: LabelValues, value: number): void;
    /**
     * Set gauge value
     * @param value The value to set
     */
    set(value: number): void;
    /**
     * Set gauge value to current epoch time in ms
     * @param labels Object with label keys and values
     */
    setToCurrentTime(labels?: LabelValues): void;
    /**
     * Start a timer where the gauges value will be the duration in seconds
     * @param labels Object with label keys and values
     * @return Function to invoke when timer should be stopped
     */
    startTimer(labels?: LabelValues): (labels?: LabelValues) => void;
}
/**
 * A summary samples observations
 */
export interface Histogram {
    /**
     * Observe value in summary
     * @param value The value to observe
     */
    observe(value: number): void;
    /**
     * Observe value for given labels
     * @param labels Object with label keys and values
     * @param value Value to observe
     */
    observe(labels: LabelValues, value: number): void;
    /**
     * Start a timer where the value in seconds will observed
     * @param labels Object with label keys and values
     * @return Function to invoke when timer should be stopped
     */
    startTimer(labels?: LabelValues): (labels?: LabelValues) => void;
    /**
     * Reset all values in the summary
     */
    reset(): void;
}
export declare class MetricsServiceInternal {
    gaugeCache: Map<string, Gauge>;
    counterCache: Map<string, Counter>;
    histogramCache: Map<string, Histogram>;
    constructor();
    protected getOrCreate(map: Map<string, any>, name: string, creator: () => any): any;
    counter(metricName: any, labels?: any[], metricHelp?: string): Counter;
    gauge(metricName: any, labels?: any[], metricHelp?: string): Gauge;
    /**
     * Get a histogram to update
     * @param metricName
     * @param labels
     * @param metricHelp
     * @return {Summary}
     */
    histogram(metricName: any, labels?: any[], metricHelp?: string): Histogram;
}
export declare const MetricsService: MetricsServiceInternal;
export declare class MetricsManager {
    static setup(appName: string, context: Context): void;
    static registerSingletons(appName: string, context: Context): void;
}