/**
 * Metrics registry - collects and formats Prometheus metrics.
 */
import { type CounterMetric, type GaugeMetric, type HistogramMetric } from './types.js';
/**
 * Metrics registry for collecting and exporting metrics.
 */
export declare class MetricsRegistry {
    private metrics;
    /**
     * Register a counter metric.
     */
    registerCounter(name: string, help: string): CounterMetric;
    /**
     * Register a gauge metric.
     */
    registerGauge(name: string, help: string): GaugeMetric;
    /**
     * Register a histogram metric.
     */
    registerHistogram(name: string, help: string, buckets?: number[]): HistogramMetric;
    /**
     * Increment a counter.
     */
    incCounter(metric: CounterMetric, labels?: Record<string, string>, value?: number): void;
    /**
     * Set a gauge value.
     */
    setGauge(metric: GaugeMetric, value: number, labels?: Record<string, string>): void;
    /**
     * Increment a gauge.
     */
    incGauge(metric: GaugeMetric, labels?: Record<string, string>, value?: number): void;
    /**
     * Decrement a gauge.
     */
    decGauge(metric: GaugeMetric, labels?: Record<string, string>, value?: number): void;
    /**
     * Observe a value in a histogram.
     */
    observeHistogram(metric: HistogramMetric, value: number, labels?: Record<string, string>): void;
    /**
     * Start a timer for a histogram observation.
     */
    startTimer(metric: HistogramMetric, labels?: Record<string, string>): () => void;
    /**
     * Format all metrics as Prometheus text format.
     */
    format(): string;
}
/** Global metrics registry instance. */
export declare const globalRegistry: MetricsRegistry;
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