export type HealthStatus = 'healthy' | 'unhealthy' | 'degraded';
export interface DependencyHealth {
    name: string;
    status: HealthStatus;
    message?: string;
    latency?: number;
    lastCheck?: Date;
}
export interface HealthCheckResult {
    status: HealthStatus;
    version: string;
    uptime: number;
    timestamp: Date;
    dependencies: Record<string, DependencyHealth>;
    features: Record<string, boolean>;
    metrics?: {
        requests: number;
        errors: number;
        activeSession: number;
    };
}
export declare class HealthService {
    private static instance;
    private readonly startTime;
    private cachedHealth?;
    private readonly cacheTimeout;
    private constructor();
    static getInstance(): HealthService;
    /**
     * Perform comprehensive health check
     */
    checkHealth(): Promise<HealthCheckResult>;
    /**
     * Check SonarQube connectivity
     */
    private checkSonarQube;
    /**
     * Get metrics summary
     */
    private getMetricsSummary;
    /**
     * Get readiness status (for Kubernetes)
     */
    checkReadiness(): Promise<{
        ready: boolean;
        checks: Record<string, {
            ready: boolean;
            message?: string;
        }>;
    }>;
    /**
     * Reset the singleton instance (for testing)
     */
    static resetInstance(): void;
}