/**
 * Health Check Module
 *
 * Provides health check functions and optional HTTP server for:
 * - /health - Full health status JSON
 * - /ready  - Kubernetes readiness probe (200/503)
 * - /live   - Kubernetes liveness probe (200/503)
 * - /metrics - Prometheus metrics
 *
 * Enable HTTP server by setting HEALTH_PORT environment variable.
 */
export interface HealthStatus {
    status: "healthy" | "degraded" | "unhealthy";
    uptime: number;
    version: string;
    timestamp: string;
    checks: {
        circuitBreaker: {
            state: "closed" | "open" | "half-open";
            consecutiveFailures: number;
        };
        cache: {
            size: number;
            methods: Record<string, number>;
        };
        rateLimiter: {
            requestsInWindow: number;
            limited: boolean;
            perChatTracked: number;
        };
    };
}
/**
 * Get full health status
 */
export declare function getHealthStatus(): HealthStatus;
/**
 * Check if service is ready to accept traffic (K8s readiness)
 * Returns false if circuit breaker is open
 */
export declare function isReady(): boolean;
/**
 * Check if service is alive (K8s liveness)
 * Always returns true unless process is corrupted
 */
export declare function isLive(): boolean;
/**
 * Start health check HTTP server
 * @param port - Port to listen on (default from HEALTH_PORT env)
 */
export declare function startHealthServer(port?: number): void;
/**
 * Stop health check HTTP server
 */
export declare function stopHealthServer(): Promise<void>;
/**
 * Check if health server is running
 */
export declare function isHealthServerRunning(): boolean;
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