/**
 * @packageDocumentation
 *
 * Stores metrics in memory and periodically invokes a configured callback to
 * receive them.
 *
 * @example
 *
 * ```ts
 * import { createLibp2p } from 'libp2p'
 * import { simpleMetrics } from '@libp2p/simple-metrics'
 *
 * const node = await createLibp2p({
 *   // ... other options
 *   metrics: simpleMetrics({
 *     onMetrics: (metrics) => {
 *       // do something with metrics
 *     }
 *   }),
 *   intervalMs: 1000 // default 1s
 * })
 *
 * ```
 */
import type { Metrics, ComponentLogger } from '@libp2p/interface';
export interface OnMetrics {
    (metrics: Record<string, any>): void;
}
export interface SimpleMetricsInit {
    /**
     * How often to invoke the onMetrics callback
     */
    intervalMs?: number;
    /**
     * A callback periodically invoked with collected metrics
     */
    onMetrics: OnMetrics;
}
export interface SimpleMetricsComponents {
    logger: ComponentLogger;
}
export declare function simpleMetrics(init: SimpleMetricsInit): (components: SimpleMetricsComponents) => Metrics;
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