import type { Context } from '../context';
export interface NumericMetricSample {
    labels: MetricLabels;
    value: number;
}
export interface BucketMetricSample {
    labels: MetricLabels;
    count: number;
    sum: number;
    buckets: Array<{
        le: number | '+Inf';
        count: number;
    }>;
}
export type MetricSample = NumericMetricSample | BucketMetricSample;
export type CollectedMetric = {
    name: string;
    help: string;
    type: 'counter' | 'gauge';
    samples: NumericMetricSample[];
} | {
    name: string;
    help: string;
    type: 'histogram';
    samples: BucketMetricSample[];
};
export type MetricLabels = Record<string, string>;
export interface Counter {
    inc(value?: number, labels?: MetricLabels): void;
}
export interface Gauge {
    inc(value?: number, labels?: MetricLabels): void;
    dec(value?: number, labels?: MetricLabels): void;
    set(value: number, labels?: MetricLabels): void;
}
export interface Histogram {
    observe(value: number, labels?: MetricLabels): void;
    restore(sample: BucketMetricSample): void;
}
export interface ImpactMetricsDataSource {
    collect(): CollectedMetric[];
    restore(metrics: CollectedMetric[]): void;
}
export interface ImpactMetricRegistry {
    getCounter(counterName: string): Counter | undefined;
    getGauge(gaugeName: string): Gauge | undefined;
    getHistogram(histogramName: string): Histogram | undefined;
    counter(opts: MetricOptions): Counter;
    gauge(opts: MetricOptions): Gauge;
    histogram(opts: BucketMetricOptions): Histogram;
}
export declare class InMemoryMetricRegistry implements ImpactMetricsDataSource, ImpactMetricRegistry {
    private counters;
    private gauges;
    private histograms;
    getCounter(counterName: string): Counter | undefined;
    getGauge(gaugeName: string): Gauge | undefined;
    getHistogram(histogramName: string): Histogram | undefined;
    counter(opts: MetricOptions): Counter;
    gauge(opts: MetricOptions): Gauge;
    histogram(opts: BucketMetricOptions): Histogram;
    collect(): CollectedMetric[];
    restore(metrics: CollectedMetric[]): void;
}
export interface MetricOptions {
    name: string;
    help: string;
    labelNames?: string[];
}
export interface BucketMetricOptions extends MetricOptions {
    buckets: number[];
}
/** @deprecated MetricFlagContext will be removed in a future release. */
export interface MetricFlagContext {
    flagNames: string[];
    context: Context;
}
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