/**
 * @file metrics.routes.ts
 * @description HTTP route registration for the `/metrics` endpoint (issue #397).
 */
import type { MetricsOptionsInterface } from '../common';
import type { MetricsService } from './metrics.service';
/**
 * Minimal server interface for route registration. Mirrors `HealthRouteServer`
 * to avoid importing the full `FrontMcpServerInstance` (circular dependencies).
 */
export interface MetricsRouteServer {
    registerRoute(method: 'GET' | 'POST' | 'PUT' | 'PATCH' | 'DELETE' | 'OPTIONS' | 'HEAD', path: string, handler: (req: {
        headers?: Record<string, string | string[] | undefined>;
    }, res: MetricsResponseLike) => Promise<void> | void): void;
}
/** Subset of the Express-style response object the route uses. */
export interface MetricsResponseLike {
    status(code: number): MetricsResponseLike;
    setHeader?(name: string, value: string): MetricsResponseLike | void;
    type?(contentType: string): MetricsResponseLike;
    send?(body: string): MetricsResponseLike | void;
    json(payload: unknown): void;
}
/**
 * Register the `GET <path>` metrics endpoint. No-op when the config has
 * `enabled !== true` — callers should already have gated this call but the
 * extra guard keeps `prepare()` simple.
 */
export declare function registerMetricsRoutes(server: MetricsRouteServer, service: MetricsService, config: MetricsOptionsInterface): void;
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