/**
 * slowQueryAlert.ts
 *
 * Rolling 5-minute p95 search-latency monitor.
 * Emits a `[metrics] SLOW` warning to stdout when p95 exceeds the threshold.
 * Threshold is configurable via SLOW_QUERY_THRESHOLD_MS (default 500 ms).
 *
 * Phase 4 speed improvement.
 */
/**
 * Record one search latency sample and emit a slow-query alert if warranted.
 * Safe to call on every search request — low overhead.
 */
export declare function recordSearchLatency(durationMs: number): void;
/**
 * Return a snapshot of the current rolling window (for tests and diagnostics).
 */
export declare function getSlowQueryStats(): {
    sampleCount: number;
    p95Ms: number;
    thresholdMs: number;
};
/** Reset state — used in tests. */
export declare function resetSlowQueryAlert(): void;
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