/**
 * SMI-1018: Prometheus Metrics Exporter
 *
 * Exports Skillsmith metrics in Prometheus text exposition format.
 * Integrates with existing MetricsRegistry for monitoring dashboards.
 *
 * @see https://prometheus.io/docs/instrumenting/exposition_formats/
 */
import type { MetricsSnapshot } from './metrics.js';
/**
 * Prometheus export options
 */
export interface PrometheusExportOptions {
    /** Include TYPE and HELP comments (default: true) */
    includeMetadata?: boolean;
    /** Prefix for all metric names (default: none) */
    prefix?: string;
    /** Custom labels to add to all metrics */
    globalLabels?: Record<string, string>;
    /** Timestamp for all metrics (epoch ms, default: current time) */
    timestamp?: number;
}
/**
 * Export metrics snapshot to Prometheus text format
 *
 * @param snapshot - Metrics snapshot from MetricsRegistry.getSnapshot()
 * @param options - Export options
 * @returns Prometheus text exposition format string
 *
 * @example
 * ```typescript
 * const metrics = getMetrics()
 * const snapshot = metrics.getSnapshot()
 * const prometheusText = exportToPrometheus(snapshot)
 * // Returns:
 * // # HELP skillsmith_mcp_request_total Total number of MCP tool requests
 * // # TYPE skillsmith_mcp_request_total counter
 * // skillsmith_mcp_request_total 42
 * ```
 */
export declare function exportToPrometheus(snapshot: MetricsSnapshot, options?: PrometheusExportOptions): string;
/**
 * Get current metrics in Prometheus format
 * Convenience function that combines getSnapshot() and exportToPrometheus()
 *
 * @param options - Export options
 * @returns Prometheus text exposition format string
 *
 * @example
 * ```typescript
 * // In an HTTP handler:
 * app.get('/metrics', (req, res) => {
 *   res.set('Content-Type', 'text/plain; version=0.0.4')
 *   res.send(getPrometheusMetrics())
 * })
 * ```
 */
export declare function getPrometheusMetrics(options?: PrometheusExportOptions): string;
/**
 * Prometheus HTTP endpoint handler
 *
 * Creates a handler function suitable for Express/Koa/etc.
 *
 * @param options - Export options
 * @returns Handler function (req, res) => void
 *
 * @example
 * ```typescript
 * // Express
 * import express from 'express'
 * import { createPrometheusHandler } from '@skillsmith/core'
 *
 * const app = express()
 * app.get('/metrics', createPrometheusHandler())
 * ```
 */
export declare function createPrometheusHandler(options?: PrometheusExportOptions): (req: unknown, res: {
    set: (k: string, v: string) => void;
    send: (body: string) => void;
}) => void;
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