/**
 * MetricsCleanup — periodic cleanup of old metrics (STORY-022)
 *
 * Runs on a configurable interval, deleting metrics older than retention period.
 */
import { MetricsStore } from './metrics-store.js';
export interface MetricsCleanupOptions {
    /** Retention period in milliseconds (default: 7 days) */
    retentionMs?: number;
    /** Cleanup interval in milliseconds (default: 1 hour) */
    intervalMs?: number;
}
export declare class MetricsCleanup {
    private store;
    private timer;
    private readonly retentionMs;
    private readonly intervalMs;
    constructor(store: MetricsStore, options?: MetricsCleanupOptions);
    start(): void;
    stop(): void;
    runCleanup(): number;
    isRunning(): boolean;
}
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