import { EventEmitter } from 'events';
import { MetricsData, CNDConfig } from '../types.js';
export interface PerformanceMetrics {
    timestamp: Date;
    cpu: {
        usage: number;
        loadAverage: number[];
    };
    memory: {
        used: number;
        total: number;
        percentage: number;
        heapUsed: number;
        heapTotal: number;
    };
    database: {
        activeConnections: number;
        totalQueries: number;
        avgQueryTime: number;
        slowQueries: number;
    };
    api: {
        totalRequests: number;
        avgResponseTime: number;
        errorRate: number;
        throughput: number;
    };
    cache: {
        hitRate: number;
        missRate: number;
        evictions: number;
        totalKeys: number;
    };
}
export declare class MetricsManager extends EventEmitter {
    private config;
    private metrics;
    private performanceMetrics;
    private metricsInterval;
    private maxMetricsHistory;
    private counters;
    private responseTimes;
    private queryTimes;
    constructor(config: CNDConfig['performance']);
    /**
     * Start metrics collection
     */
    start(): Promise<void>;
    /**
     * Stop metrics collection
     */
    stop(): Promise<void>;
    /**
     * Record API request metric
     */
    recordAPIRequest(operation: string, duration: number, status: 'success' | 'error'): void;
    /**
     * Record database query metric
     */
    recordDatabaseQuery(operation: string, duration: number, status: 'success' | 'error'): void;
    /**
     * Record cache operation
     */
    recordCacheOperation(operation: 'hit' | 'miss' | 'eviction'): void;
    /**
     * Get current performance metrics
     */
    getCurrentMetrics(): PerformanceMetrics;
    /**
     * Get metrics history
     */
    getMetricsHistory(startDate?: Date, endDate?: Date, limit?: number): MetricsData[];
    /**
     * Get performance metrics history
     */
    getPerformanceHistory(limit?: number): PerformanceMetrics[];
    /**
     * Get health status
     */
    getHealthStatus(): {
        status: 'healthy' | 'warning' | 'critical';
        checks: Record<string, {
            status: string;
            message: string;
            value?: number;
        }>;
    };
    private collectPerformanceMetrics;
    private calculateThroughput;
    /**
     * Export metrics in Prometheus format
     */
    exportPrometheusMetrics(): string;
}
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