import { BehaviorSubject } from 'rxjs';
export type NodeMetrics = {
    node_id: string;
    host: string;
    namespace: string;
    services: string[];
    version: number;
    online_since: number;
    last_seen: number;
};
export type DiscoveryMetrics = {
    total_nodes: number;
    nodes: NodeMetrics[];
    services: Record<string, string[]>;
    updated_at: number;
};
export type WebsocketDiscoveryServerOptions = {
    port?: number;
    host?: string;
    path?: string;
};
export declare class WebsocketDiscoveryServer {
    #private;
    readonly metrics$: BehaviorSubject<DiscoveryMetrics>;
    constructor(options?: WebsocketDiscoveryServerOptions);
    get port(): number | null;
    getMetrics(): DiscoveryMetrics;
    close(): void;
}