import type { OnApplicationShutdown, OnModuleInit } from '@nestjs/common';
import type { ProfilerModuleOptions } from '../nest-profiler.builder.js';
import type { RuntimeCollectorData } from './runtime-metrics.interface.js';
export declare class RuntimeMetricsService implements OnModuleInit, OnApplicationShutdown {
    private readonly logger;
    readonly enabled: boolean;
    readonly interval: number;
    private readonly historySize;
    private timer;
    private lagHistogram;
    private gcObserver;
    private gcTotal;
    private gcWindow;
    private lastCpu;
    private lastCpuAt;
    private lastElu;
    private readonly samples;
    constructor(options?: ProfilerModuleOptions);
    onModuleInit(): void;
    onApplicationShutdown(): void;
    private sample;
    private readLag;
    private processInfo;
    private heapStatistics;
    snapshot(): RuntimeCollectorData;
}