import type { ObservabilityMetrics, MetricsConfig, Span } from '../types/index.js';
export interface MetricsService extends ObservabilityMetrics {
    getAll(): {
        counters: Record<string, number>;
        gauges: Record<string, number>;
        histograms: Record<string, {
            count: number;
            mean: number;
            min: number;
            max: number;
        }>;
        timings: Record<string, {
            count: number;
            mean: number;
            p50: number;
            p95: number;
            p99: number;
        }>;
    };
    reset(): void;
}
export declare class InMemoryMetricsService implements MetricsService {
    private counters;
    private gauges;
    private histograms;
    private timings;
    private spans;
    private config;
    constructor(config?: MetricsConfig);
    private makeKey;
    increment(name: string, value?: number, tags?: Record<string, string>): void;
    gauge(name: string, value: number, tags?: Record<string, string>): void;
    histogram(name: string, value: number, tags?: Record<string, string>): void;
    timing(name: string, value: number, tags?: Record<string, string>): void;
    recordSpan(span: Span): void;
    getAll(): {
        counters: Record<string, number>;
        gauges: Record<string, number>;
        histograms: Record<string, {
            count: number;
            mean: number;
            min: number;
            max: number;
        }>;
        timings: Record<string, {
            count: number;
            mean: number;
            p50: number;
            p95: number;
            p99: number;
        }>;
    };
    reset(): void;
}