/**
 * In-process metrics store for Iranti.
 *
 * Lightweight, zero-dependency counter and timer registry for tracking LLM
 * call volume, cache effectiveness, DB query counts, and latency percentiles.
 * All data lives in module-level objects and is reset with reset(). Intended
 * for request-scoped diagnostics (doctor, debug output) — not persistent
 * monitoring; use an external metrics system for that.
 *
 * Key exports:
 *   - inc()        — increment a named counter
 *   - timeStart()  — record a start timestamp (returns ms)
 *   - timeEnd()    — record a duration sample for a named timer
 *   - snapshot()   — read current counters and timer stats (count, avg, p95, max)
 *   - reset()      — clear all counters and timers (call between tests)
 */
type CounterName = "llm.calls" | "llm.failures" | "llm.cache_hit" | "llm.cache_miss" | "db.queries" | "librarian.created" | "librarian.updated" | "librarian.rejected" | "librarian.escalated" | "librarian.conflict_multi_step" | "archivist.processed" | "archivist.resolutions_applied";
type TimerName = "attendant.handshake_ms" | "attendant.observe_ms" | "attendant.attend_ms" | "attendant.reconvene_ms" | "librarian.write_ms" | "llm.latency_ms" | "archivist.cycle_ms";
export declare function inc(name: CounterName, by?: number): void;
export declare function timeStart(): number;
export declare function timeEnd(name: TimerName, startMs: number): void;
export declare function snapshot(): {
    counters: {
        [x: string]: number;
    };
    timers: {
        [k: string]: {
            count: number;
            avg: number;
            p95: number;
            max: number;
        };
    };
};
export declare function reset(): void;
export {};
//# sourceMappingURL=metrics.d.ts.map