import { Counter, Gauge, Histogram } from 'prom-client';
export declare class DbMetricsService {
    readonly activeConnections: Gauge<string>;
    readonly idleConnections: Gauge<string>;
    readonly queryTotal: Counter<string>;
    readonly queryFailed: Counter<string>;
    readonly queryDuration: Histogram<string>;
    constructor(activeConnections: Gauge<string>, idleConnections: Gauge<string>, queryTotal: Counter<string>, queryFailed: Counter<string>, queryDuration: Histogram<string>);
}