import { IncomingMessage, ServerResponse } from "http";
import { Counter, Histogram } from "prom-client";
import { Next } from "./helpers";
export declare const requestCounter: Counter<"code" | "path" | "method">;
export declare const requestTimer: Histogram<"path" | "method">;
export declare function createMetricsMiddleware(opts?: {
    trackAllFoundPaths?: boolean;
}): (req: IncomingMessage & {
    routePath?: string;
}, res: ServerResponse, next?: Next) => void;