import type { Logger } from 'homebridge';
import type { HttpConfig, HttpResponse, HttpServer } from './adapters/http';
import type { Metric } from './metrics';
export declare class MetricsRenderer {
    private readonly prefix;
    constructor(prefix: string);
    render(metrics: Metric[]): string;
    private formatMetric;
    private static renderLabels;
    private metricName;
}
export declare class PrometheusServer implements HttpServer {
    readonly config: HttpConfig;
    readonly log: Logger | null;
    private readonly renderer;
    private metricsDiscovered;
    private metricsResponse;
    constructor(config: HttpConfig, log?: Logger | null, renderer?: MetricsRenderer);
    onRequest(): HttpResponse | null;
    onMetrics(): HttpResponse;
    onNotFound(): HttpResponse;
    onError(error: Error): HttpResponse;
    onMetricsDiscovery(metrics: Metric[]): void;
}
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