export interface IndicatorOptions {
    /**
     * Description
     */
    description?: string;
    /**
     * FIXME: WTF?
     */
    scope?: string;
    /**
     * Flag indicating whether the readiness probe is optional.
     * If set to `true`, an error in the probe will not affect the global system status.
     */
    isOptional?: boolean;
}
/**
 * Registers health indicator. Indicators should be added to application
 * modules as providers and use common DI to inject necessary services
 * (api, database clients, etc.)
 * @param {string} key Healthcheck response is object where each key
 * is a specific indicator. Thus you can use key to recognize an
 * indicator in healthcheck response
 * @param {IndicatorOptions} options Indicator metadata
 * @returns {ClassDecorator}
 */
export declare const Indicator: (key: string, options?: IndicatorOptions) => ClassDecorator;