import HttpAgent from 'agentkeepalive';
export declare class HttpAgentSingleton {
    static getHttpAgent(): HttpAgent;
    static httpAgentStats(): {
        freeSockets: number;
        pendingRequests: number;
        sockets: number;
    };
    /**
     * Update HTTP agent statistics as diagnostics metrics (gauges).
     * This method should be called periodically to export current HTTP agent state.
     */
    static updateHttpAgentMetrics(): void;
    private static httpAgent;
    private static count;
}