import { HoistService, InitContext, MetricTags } from '@xh/hoist/core';
/**
 * Lightweight client-side metrics service. Records timers and counters by name and optional tags,
 * batching to the server where they are registered with the Micrometer registry on hoist-core.
 *
 * Apps should generally use the {@link Runner} `counter()` / `timer()` builder methods instead of
 * calling this service directly.
 */
export declare class MetricsService extends HoistService {
    telemetryPrefix: string;
    static instance: MetricsService;
    /** Max entries to retain when pushes are failing - oldest are dropped beyond this. */
    private static MAX_PENDING;
    private pending;
    initAsync(ctx: InitContext): Promise<void>;
    /** Record a timer measurement (elapsed millis) for the named metric. */
    recordTimer(name: string, valueMs: number, tags?: MetricTags): void;
    /** Increment a counter for the named metric (defaults to +1). */
    recordCount(name: string, value?: number, tags?: MetricTags): void;
    /**
     * Flush the queue of pending metric entries to the server.
     * @internal - apps should generally allow this service to manage w/its internal debounce.
     */
    pushPendingAsync(): Promise<void>;
    private queue;
    /** Bound the pending buffer, silently dropping oldest entries (failed pushes are logged). */
    private enforceCap;
    private pushPendingBuffered;
}