/**
 * SMI-739: Custom Metrics Registration
 * SMI-755: Graceful fallback when OpenTelemetry unavailable
 *
 * Provides metrics collection for Skillsmith operations.
 *
 * @see metric-types.ts for type definitions
 * @see metric-helpers.ts for helper classes
 */
export type { MetricType, MetricsConfig, MetricLabels, Counter, Histogram, Gauge, MetricsSnapshot, } from './metric-types.js';
export { LATENCY_BUCKETS } from './metric-types.js';
import type { Counter, Histogram, Gauge, MetricsConfig, MetricsSnapshot } from './metric-types.js';
/**
 * Skillsmith Metrics Registry
 */
export declare class MetricsRegistry {
    private counters;
    private histograms;
    private gauges;
    private enabled;
    private initialized;
    private config;
    readonly mcpRequestLatency: Histogram;
    readonly mcpRequestCount: Counter;
    readonly mcpErrorCount: Counter;
    readonly dbQueryLatency: Histogram;
    readonly dbQueryCount: Counter;
    readonly cacheHits: Counter;
    readonly cacheMisses: Counter;
    readonly cacheSize: Gauge;
    readonly embeddingLatency: Histogram;
    readonly embeddingCount: Counter;
    readonly searchLatency: Histogram;
    readonly searchCount: Counter;
    readonly activeOperations: Gauge;
    constructor(config?: MetricsConfig);
    initialize(): Promise<void>;
    isEnabled(): boolean;
    createCounter(name: string, _options?: {
        description?: string;
        unit?: string;
    }): Counter;
    createHistogram(name: string, _options?: {
        description?: string;
        unit?: string;
        buckets?: number[];
    }): Histogram;
    createGauge(name: string, _options?: {
        description?: string;
        unit?: string;
    }): Gauge;
    getCacheHitRatio(): number;
    getSnapshot(): MetricsSnapshot;
    reset(): void;
}
export declare function getMetrics(): MetricsRegistry;
export declare function initializeMetrics(config?: MetricsConfig): Promise<MetricsRegistry>;
export declare function timeAsync<T>(histogram: Histogram, fn: () => Promise<T>, labels?: Record<string, string | number | boolean>): Promise<T>;
export declare function timeSync<T>(histogram: Histogram, fn: () => T, labels?: Record<string, string | number | boolean>): T;
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