/**
 * ChannelHeartbeatScheduler — runs per-account heartbeat probes for plugins
 * that expose a `heartbeat.check(...)` hook, records the result in the shared
 * {@link ChannelHealthMonitor}, and asks the lifecycle supervisor for a soft
 * restart when a check fails (rate-limited to once per minute per channel).
 *
 * Previously this lived as `_scheduleHeartbeat` + `_clearHeartbeatTimers` +
 * `_softRestartChannel` + two private Maps on `ChannelManager`. Extracting it
 * makes the heartbeat policy testable in isolation and lets the lifecycle
 * supervisor focus on plugin start/stop without worrying about timer wiring.
 */
import type { Config } from '../config/schema.js';
import type { ChannelPlugin } from './plugin-types.js';
import type { ChannelHealthMonitor } from './health-monitor.js';
export interface ChannelHeartbeatSchedulerOptions {
    /** Effective config snapshot (per-account listing comes from `plugin.config.listAccountIds(cfg)`). */
    getConfig: () => Config;
    /** Shared health monitor that channel APIs surface to the UI. */
    healthMonitor: ChannelHealthMonitor;
    /**
     * Triggered when a check fails AND we are past the restart-throttle window.
     * The supervisor performs `stop()` + `startPlugin()`; the scheduler does not
     * touch plugin lifecycle directly.
     */
    requestSoftRestart: (channelId: string) => void;
}
export declare class ChannelHeartbeatScheduler {
    private readonly opts;
    /** Key shape: `${pluginId}:${accountId}`. */
    private readonly timers;
    private readonly lastRestartAt;
    constructor(opts: ChannelHeartbeatSchedulerOptions);
    /** Register heartbeat checks for every account exposed by the plugin. */
    schedule(plugin: ChannelPlugin): void;
    /** Drop every probe scheduled for `pluginId` (called on stop / soft-restart). */
    clear(pluginId: string): void;
    /** Test helper / process shutdown. */
    clearAll(): void;
    private runProbe;
}