/**
 * Performance Metrics Collection
 *
 * Collects and aggregates performance metrics over time.
 */
export interface Metric {
    name: string;
    value: number;
    timestamp: number;
    tags?: Record<string, string>;
}
export interface AggregatedMetric {
    name: string;
    count: number;
    sum: number;
    avg: number;
    min: number;
    max: number;
    p50: number;
    p95: number;
    p99: number;
}
export declare class MetricsCollector {
    private metrics;
    private maxMetrics;
    constructor(maxMetrics?: number);
    /**
     * Record a metric
     */
    record(name: string, value: number, tags?: Record<string, string>): void;
    /**
     * Get all metrics
     */
    getMetrics(): Metric[];
    /**
     * Get metrics by name
     */
    getByName(name: string): Metric[];
    /**
     * Get metrics within time range
     */
    getByTimeRange(startTime: number, endTime: number): Metric[];
    /**
     * Aggregate metrics by name
     */
    aggregate(name: string): AggregatedMetric | null;
    /**
     * Get all aggregated metrics
     */
    aggregateAll(): AggregatedMetric[];
    /**
     * Calculate percentile
     */
    private percentile;
    /**
     * Clear all metrics
     */
    clear(): void;
    /**
     * Generate summary report
     */
    generateReport(): string;
}
/**
 * Global metrics collector
 */
export declare const metrics: MetricsCollector;
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