/**
 * Telemetry hook fan-out (internal).
 * withTelemetry plugin subscribes to router.onError() and internal events.
 * No separate onTelemetry() entry point; all wiring is internal.
 */
import type { Observer } from "../capabilities/telemetry/contracts.js";
export declare class TelemetryBridge {
    private observers;
    subscribe(observer: Observer): void;
    notifyMessage(meta: {
        type: string;
        size: number;
        ts: number;
    }): Promise<void>;
    notifyError(err: unknown, meta?: Record<string, unknown>): Promise<void>;
    notifyPublish(meta: {
        topic: string;
        type: string;
    }): Promise<void>;
}
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