/**
 * Performance Monitor for BCKB System
 *
 * Tracks performance metrics, identifies bottlenecks, and provides
 * optimization recommendations for production deployments.
 */
export interface PerformanceMetric {
    operation: string;
    duration_ms: number;
    timestamp: number;
    metadata?: Record<string, any>;
}
export interface PerformanceSummary {
    total_operations: number;
    average_duration_ms: number;
    p95_duration_ms: number;
    p99_duration_ms: number;
    operations_per_second: number;
    slowest_operations: PerformanceMetric[];
    fastest_operations: PerformanceMetric[];
}
export interface SystemHealthMetrics {
    memory_usage_mb: number;
    cache_hit_rate: number;
    active_layers: number;
    total_topics: number;
    average_response_time_ms: number;
    error_rate: number;
    uptime_seconds: number;
}
export declare class PerformanceMonitor {
    private readonly enableDetailedTracking;
    private readonly enableSlowQueryLogging;
    private readonly slowQueryThresholdMs;
    private metrics;
    private errorCount;
    private totalRequests;
    private startTime;
    private readonly maxMetrics;
    constructor(enableDetailedTracking?: boolean, enableSlowQueryLogging?: boolean, slowQueryThresholdMs?: number);
    /**
     * Track a performance metric
     */
    trackOperation(operation: string, durationMs: number, metadata?: Record<string, any>): void;
    /**
     * Time and track an async operation
     */
    timeOperation<T>(operation: string, fn: () => Promise<T>, metadata?: Record<string, any>): Promise<T>;
    /**
     * Create a timer for manual tracking
     */
    createTimer(operation: string, metadata?: Record<string, any>): {
        stop: (additionalMetadata?: Record<string, any>) => number;
    };
    /**
     * Get performance summary for a specific operation
     */
    getOperationSummary(operation: string): PerformanceSummary | null;
    /**
     * Get overall system performance summary
     */
    getOverallSummary(): PerformanceSummary;
    /**
     * Get system health metrics
     */
    getSystemHealth(): SystemHealthMetrics;
    /**
     * Get optimization recommendations based on performance data
     */
    getOptimizationRecommendations(): Array<{
        type: string;
        message: string;
        priority: 'high' | 'medium' | 'low';
        impact: string;
    }>;
    /**
     * Get operation breakdown by frequency and performance
     */
    getOperationBreakdown(): Record<string, {
        count: number;
        avg_duration: number;
        total_time: number;
    }>;
    /**
     * Clear all metrics (useful for testing or memory management)
     */
    clearMetrics(): void;
    /**
     * Export metrics for external analysis
     */
    exportMetrics(): {
        metrics: PerformanceMetric[];
        summary: PerformanceSummary;
        system_health: SystemHealthMetrics;
        operation_breakdown: Record<string, any>;
    };
    private calculateOpsPerSecond;
}
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