export type MissReason = "cold_start" | "not_in_filelist" | "invalidation" | "no_filelist_cache" | "indexed_without_content";
interface CumulativeMetrics {
    requestScopedHits: number;
    persistentCacheHits: number;
    fileListHits: number;
    networkFetches: number;
    totalNetworkMs: number;
    requestsTracked: number;
}
export declare function startRequestMetrics(): void;
export declare function endRequestMetrics(requestContext?: {
    requestId?: string;
    pathname?: string;
    mode?: string;
}): void;
type ContentMetricEvent = "REQUEST_SCOPED_HIT" | "PERSISTENT_CACHE_HIT" | "FILE_LIST_HIT" | "NETWORK_FETCH" | "NETWORK_FETCH_COMPLETE" | "CACHE_MISS";
export declare function logContentMetric(event: ContentMetricEvent, details: {
    path?: string;
    mode?: string;
    isPreviewMode?: boolean;
    durationMs?: number;
    missReason?: MissReason;
    [key: string]: unknown;
}): void;
export declare function getContentMetricsSnapshot(): CumulativeMetrics & {
    avgNetworkMsPerRequest: number;
};
export declare function resetContentMetrics(): void;
export {};
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