import type { FastifyInstance } from 'fastify';
import promClient from 'prom-client';
import type { IFastifyMetrics, IMetricsPluginOptions } from './types';
/**
 * Plugin constructor
 *
 * @public
 */
interface IConstructiorDeps {
    /** Prometheus client */
    client: typeof promClient;
    /** Fastify instance */
    fastify: FastifyInstance;
    /** Metric plugin options */
    options: Partial<IMetricsPluginOptions>;
}
export declare const DEFAULT_OPTIONS: IMetricsPluginOptions;
/**
 * Fastify metrics handler class
 *
 * @public
 */
export declare class FastifyMetrics implements IFastifyMetrics {
    private readonly deps;
    private readonly metricStorage;
    private readonly routesWhitelist;
    private readonly methodBlacklist;
    private routeMetrics?;
    private readonly options;
    private readonly routeFallback;
    private readonly getRouteLabel;
    private readonly registeredRoutesOnly;
    private readonly groupStatusCodes;
    private readonly hasCustomLabels;
    private readonly customLabelEntries;
    private createTimers;
    /** Prom-client instance. */
    readonly client: typeof promClient;
    /** Creates metrics collector instance */
    constructor(deps: IConstructiorDeps);
    /** Populates methods blacklist to exclude them from metrics collection */
    private setMethodBlacklist;
    /** Populates routes whitelist */
    private setRouteWhitelist;
    /**
     * Get default metrics registry
     *
     * @returns Default metrics registry
     */
    private getCustomDefaultMetricsRegistries;
    /**
     * Get route metrics registry
     *
     * @returns Route metrics registry
     */
    private getCustomRouteMetricsRegistries;
    /** Register route to expose metrics */
    private exposeMetrics;
    /** Collect default prom-client metrics */
    private collectDefaultMetrics;
    private registerRouteMetrics;
    /**
     * Build a pre-computed timer strategy function based on enabled configuration.
     */
    private buildTimerStrategy;
    /** Check if route is in whitelist */
    private isRouteWhitelisted;
    /** Check if route is in blacklist */
    private isRouteBlacklisted;
    /** Collect per-route metrics */
    private collectRouteMetrics;
    /**
     * Initialize metrics in registries. Useful if you call `registry.clear()` to
     * register metrics in regisitries once again
     */
    initMetricsInRegistry(): void;
}
export {};
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