/**
 * 指标收集（Metrics Registry）
 *
 * 轻量级内存计数器，零依赖。按工具名索引的全局注册表。
 */
export interface ToolMetrics {
    calls: number;
    errors: number;
    cacheHits: number;
    totalLatencyMs: number;
    circuitBreakerTrips: number;
    preprocessSkipped: number;
}
/** 指标快照，包含时间戳 */
export interface MetricsSnapshot {
    timestamp: number;
    tools: Record<string, ToolMetrics>;
}
export declare class MetricsRegistry {
    private tools;
    private ensureTool;
    recordCall(tool: string): void;
    recordError(tool: string): void;
    recordCacheHit(tool: string): void;
    recordLatency(tool: string, ms: number): void;
    recordCircuitBreakerTrip(tool: string): void;
    recordPreprocessSkipped(tool: string): void;
    /** 获取所有工具的指标快照 */
    getSnapshot(): MetricsSnapshot;
    /** 重置所有指标 */
    reset(): void;
    /** 获取平均延迟（毫秒） */
    getAverageLatency(tool: string): number;
}
export declare const metricsRegistry: MetricsRegistry;
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