/**
 * Metrics Route
 * GET /metrics — Prometheus exposition format (v2.16)
 */
import type { FastifyInstance } from 'fastify';
export interface MetricsRouteOptions {
    enabled: boolean;
    ipAllowList: string[];
}
export declare function setupMetricsRoute(fastify: FastifyInstance, options: MetricsRouteOptions): Promise<void>;
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