import { NestMiddleware } from '@nestjs/common';
import { OpenTelemetryModuleOptions } from '../interfaces';
import { MetricService } from '../metrics/metric.service';
export declare const DEFAULT_LONG_RUNNING_REQUEST_BUCKETS: number[];
export declare const DEFAULT_REQUEST_SIZE_BUCKETS: number[];
export declare const DEFAULT_RESPONSE_SIZE_BUCKETS: number[];
export declare class ApiMetricsMiddleware implements NestMiddleware {
    private readonly _metricService;
    private readonly _options;
    private readonly _defaultLongRunningRequestBuckets;
    private readonly _defaultRequestSizeBuckets;
    private readonly _defaultResponseSizeBuckets;
    private _requestTotal;
    private _responseTotal;
    private _responseSuccessTotal;
    private _responseErrorTotal;
    private _responseClientErrorTotal;
    private _responseServerErrorTotal;
    private _serverAbortsTotal;
    private _requestDuration;
    private _requestSizeHistogram;
    private _responseSizeHistogram;
    private readonly _defaultAttributes;
    private readonly _ignoreUndefinedRoutes;
    constructor(_metricService: MetricService, _options?: OpenTelemetryModuleOptions);
    private static _getStatusCodeClass;
    use(parentReq: any, parentRes: any, parentNext: any): void;
}