import { Context } from 'koa';
import { Logger } from './Metrics';
export { Tags } from './tags';
export declare enum CustomMetrics {
    ContentLength = "request_content_length",
    QueuingTime = "request_queuing_time",
    RequestDuration = "request_time"
}
export interface Options {
    prefix: string;
    host: string;
    skipInstrumentation?: boolean;
    logger?: Logger;
}
export default function metrics({ prefix, host, skipInstrumentation, logger, }: Options): (ctx: Context, next: Function) => Promise<void>;