export declare const WEB_PERFORMANCE_LOG = "web-performance.jsonl";
interface BaseEvent {
    event: string;
    ts: string;
    pid?: number;
    mode?: string;
}
export interface WebRequestPerformanceEvent extends BaseEvent {
    event: "request_complete";
    request_id: string;
    method: string;
    route: string;
    status: number | null;
    outcome: "finished" | "aborted";
    stream: boolean;
    slow: boolean;
    duration_ms: number;
    process_cpu_ms_during_request: number;
    concurrent_requests_at_start: number;
    max_concurrent_requests: number;
    event_loop_delay_count: number;
    event_loop_delay_total_ms: number;
    max_event_loop_delay_ms: number;
}
export interface WebEventLoopDelayEvent extends BaseEvent {
    event: "event_loop_delay";
    delay_ms: number;
    active_request_count: number;
    active_requests: Array<{
        request_id: string;
        method: string;
        route: string;
        age_ms: number;
    }>;
    active_requests_truncated: number;
}
export interface WebMemoryPerformanceEvent extends BaseEvent {
    event: "memory_sample";
    reason: "started" | "interval";
    rss_bytes: number;
    heap_used_bytes: number;
    heap_total_bytes: number;
    heap_limit_bytes: number;
    heap_used_percent: number;
    external_bytes: number;
    array_buffers_bytes: number;
    native_contexts: number;
    detached_contexts: number;
    active_request_count: number;
    gc_count: number;
    gc_duration_ms: number;
    max_gc_pause_ms: number;
    gc_by_kind: Record<string, {
        count: number;
        duration_ms: number;
    }>;
}
export interface WebGcPauseEvent extends BaseEvent {
    event: "gc_pause";
    kind: string;
    duration_ms: number;
    rss_bytes: number;
    heap_used_bytes: number;
    heap_total_bytes: number;
    heap_limit_bytes: number;
    heap_used_percent: number;
    active_request_count: number;
}
export interface WebRoutePerformanceSummary {
    method: string;
    route: string;
    requests: number;
    slow_requests: number;
    aborted_requests: number;
    p50_ms: number;
    p95_ms: number;
    max_ms: number;
    max_event_loop_delay_ms: number;
    max_concurrent_requests: number;
}
export interface WebPerformanceReport {
    state: "ok" | "unavailable";
    log_path: string;
    since: string;
    files_read: number;
    invalid_lines: number;
    requests_observed: number;
    streams_observed: number;
    slow_requests: number;
    event_loop_delays: number;
    memory: {
        samples: number;
        latest: WebMemoryPerformanceEvent;
        peak_rss_bytes: number;
        peak_heap_used_bytes: number;
        max_heap_used_percent: number;
    } | null;
    garbage_collection: {
        observed_collections: number;
        observed_duration_ms: number;
        recorded_pauses: number;
        max_pause_ms: number;
    };
    routes: WebRoutePerformanceSummary[];
    slowest_requests: WebRequestPerformanceEvent[];
    largest_event_loop_delays: WebEventLoopDelayEvent[];
    largest_gc_pauses: WebGcPauseEvent[];
    hint?: string;
}
export declare function parsePerformanceWindow(input: string): number | null;
export declare function readWebPerformanceReport(options: {
    root: string;
    since: string;
    limit: number;
    nowMs?: number;
}): WebPerformanceReport;
export {};
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