/**
 * Prometheus metrics for the remote transport (RF-RMT42).
 *
 * Hand-rolled text exposition (counters + one duration histogram) to keep the
 * published npm package dependency-free. Served on a separate internal port —
 * never behind the public Traefik router.
 */
export declare class Metrics {
    private readonly requestsTotal;
    private readonly authFailures;
    private rateLimited;
    private toolCallsTotal;
    private readonly latencyBuckets;
    private latencySum;
    private latencyCount;
    recordRequest(method: string, path: string, status: number): void;
    recordAuthFailure(reason: keyof Metrics["authFailures"]): void;
    recordRateLimited(): void;
    recordToolCall(): void;
    recordLatency(seconds: number): void;
    /** Render Prometheus text exposition format (version 0.0.4). */
    render(): string;
}
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