/**
 * Simplified metrics service for stdio-only transport
 * Tracks metrics in memory for circuit breaker and logging purposes
 */
export declare class MetricsService {
    private readonly metrics;
    constructor();
    /**
     * Record a SonarQube API request
     */
    recordSonarQubeRequest(endpoint: string, status: 'success' | 'error', duration: number): void;
    /**
     * Record a SonarQube API error
     */
    recordSonarQubeError(type: string, endpoint: string): void;
    /**
     * Update circuit breaker state
     */
    updateCircuitBreakerState(service: string, state: 'closed' | 'open' | 'half-open'): void;
    /**
     * Record a circuit breaker failure
     */
    recordCircuitBreakerFailure(service: string): void;
    /**
     * Get metrics in Prometheus format (for testing compatibility)
     */
    getMetrics(): string;
    /**
     * Stop monitoring (cleanup)
     */
    stopMonitoring(): void;
}
/**
 * Get or create the metrics service instance
 */
export declare function getMetricsService(): MetricsService;
/**
 * Cleanup the metrics service (for testing)
 */
export declare function cleanupMetricsService(): void;
/**
 * Track a SonarQube API request
 */
export declare function trackSonarQubeRequest(endpoint: string, success: boolean, duration: number, errorType?: string): void;
/**
 * Update circuit breaker metrics
 */
export declare function updateCircuitBreakerMetrics(service: string, state: 'closed' | 'open' | 'half-open'): void;
/**
 * Track circuit breaker failure
 */
export declare function trackCircuitBreakerFailure(service: string): void;