import { GlobalConfig } from '@n8n/config';
import { LicenseMetricsRepository, WorkflowRepository } from '@n8n/db';
import type express from 'express';
import { InstanceSettings } from 'n8n-core';
import { MessageEventBus } from '../eventbus/message-event-bus/message-event-bus';
import { EventService } from '../events/event.service';
import { CacheService } from '../services/cache/cache.service';
import type { MetricCategory, MetricLabel } from './types';
export declare class PrometheusMetricsService {
    private readonly cacheService;
    private readonly eventBus;
    private readonly globalConfig;
    private readonly eventService;
    private readonly instanceSettings;
    private readonly workflowRepository;
    private readonly licenseMetricsRepository;
    constructor(cacheService: CacheService, eventBus: MessageEventBus, globalConfig: GlobalConfig, eventService: EventService, instanceSettings: InstanceSettings, workflowRepository: WorkflowRepository, licenseMetricsRepository: LicenseMetricsRepository);
    private readonly counters;
    private tokenExchangeListenersRegistered;
    private readonly gauges;
    private readonly histograms;
    private readonly prefix;
    private readonly includes;
    init(app: express.Application): Promise<void>;
    enableMetric(metric: MetricCategory): void;
    disableMetric(metric: MetricCategory): void;
    disableAllMetrics(): void;
    enableLabels(labels: MetricLabel[]): void;
    disableAllLabels(): void;
    private initN8nVersionMetric;
    private initInstanceRoleMetric;
    updateOnLeaderTakeover(): void;
    updateOnLeaderStepdown(): void;
    private initDefaultMetrics;
    private initPssMetric;
    private initRouteMetrics;
    private mountMetricsEndpoint;
    private initCacheMetrics;
    private toCounter;
    private initEventBusMetrics;
    private initQueueMetrics;
    private initWorkflowExecutionDurationMetric;
    private initActiveWorkflowCountMetric;
    private toLabels;
    private buildWorkflowLabels;
    private workflowStatisticsCache;
    private getWorkflowStatistics;
    private createWorkflowStatisticsGauge;
    private initWorkflowStatisticsMetrics;
    private initTokenExchangeMetrics;
}