export declare function isUsageTimingOutputEnabled(): boolean;
export declare function isStageLoggingEnabled(): boolean;
export declare function logPipelineStage(stage: string, requestId: string, details?: Record<string, unknown>): void;
export declare function formatRequestTimingSummary(requestId: string, options?: {
    latencyMs?: number;
    requestIds?: string[];
    terminal?: boolean;
}): string;
export declare function rebindRequestTimingTimeline(fromRequestId: string, toRequestId: string): void;