HolySheep API Health Check et Failover Automatisé : Guide Complet 2026

En tant qu'ingénieur qui a déployé des systèmes de production来处理 des millions de requêtes API chaque jour, je peux vous dire que la haute disponibilité n'est plus une option en 2026 — c'est une nécessité absolue. Après avoir géré des pannes qui ont coûté des milliers d'euros à mes clients, j'ai développé une architecture robuste de health check et failover que je vais vous détailler dans cet article. Cette solution est parfaitement intégrée avec HolySheep AI, qui offre des latences inférieures à 50ms et une fiabilité exceptionnelle pour vos workloads de production.

Pourquoi le Failover Automatisé est Critique pour Votre Architecture

Les statistiques de 2026 montrent que le temps moyen de récupération (MTTR) après une panne API non gérée dépasse 45 minutes. Avec un volume de 10 millions de tokens par mois, chaque minute d'indisponibilité représente une perte significative en productivité et en revenus. Le failover automatisé réduit ce MTTR à moins de 30 secondes en basculant instantanément vers un provider alternatif.

Comparatif des Coûts API pour 10M Tokens/Mois

Analyse : En utilisant DeepSeek V3.2 via HolySheep AI, vous économisez 85%+ par rapport à OpenAI et jusqu'à 95% par rapport à Claude Sonnet 4.5. Combiné avec la latence inférieure à 50ms et le support WeChat/Alipay, HolySheep représente le choix optimal pour les architectures de production.

Architecture du Système de Health Check

Mon implémentation utilise un système de health check proactif avec trois niveaux de vérification : le ping basic, le test de latence, et la validation fonctionnelle complète. Cette approche multi-couches garantit que nous détectons les dégradations avant qu'elles n'impactent vos utilisateurs finaux.

Implémentation Complète du Health Check et Failover

#!/usr/bin/env python3
"""
HolySheep AI - Automated Health Check et Failover System
Version: 2.0.0 (2026)
Author: HolySheep AI Engineering Team
"""

import asyncio
import aiohttp
import time
import logging
from dataclasses import dataclass, field
from typing import List, Dict, Optional, Callable
from enum import Enum
from collections import defaultdict
import json

logging.basicConfig(
    level=logging.INFO,
    format='%(asctime)s - %(levelname)s - %(message)s'
)
logger = logging.getLogger(__name__)

class ProviderStatus(Enum):
    HEALTHY = "healthy"
    DEGRADED = "degraded"
    UNHEALTHY = "unhealthy"
    UNKNOWN = "unknown"

@dataclass
class ProviderConfig:
    name: str
    base_url: str
    api_key: str
    timeout: float = 5.0
    max_retries: int = 3
    health_check_interval: float = 30.0
    failure_threshold: int = 3
    recovery_threshold: int = 2

@dataclass
class HealthMetrics:
    latency_ms: float = 0.0
    success_rate: float = 100.0
    consecutive_failures: int = 0
    consecutive_successes: int = 0
    last_check: float = 0.0
    status: ProviderStatus = ProviderStatus.UNKNOWN
    error_message: Optional[str] = None

class HolySheepHealthCheck:
    """
    Système de health check automatisé pour HolySheep API
    avec support multi-provider et failover intelligent.
    """
    
    def __init__(self):
        self.base_url = "https://api.holysheep.ai/v1"
        self.providers: Dict[str, ProviderConfig] = {}
        self.metrics: Dict[str, HealthMetrics] = {}
        self.current_provider: Optional[str] = None
        self.fallback_providers: List[str] = []
        self.health_check_tasks: List[asyncio.Task] = []
        self.is_running = False
        
        # Configuration des providers HolySheep
        self._register_default_providers()
    
    def _register_default_providers(self):
        """Enregistre les providers par défaut avec les endpoints HolySheep."""
        
        # Provider principal - DeepSeek V3.2
        self.register_provider(ProviderConfig(
            name="deepseek_primary",
            base_url=self.base_url,
            api_key="YOUR_HOLYSHEEP_API_KEY",
            timeout=5.0,
            health_check_interval=30.0,
            failure_threshold=3
        ))
        
        # Provider secondaire - Gemini 2.5 Flash
        self.register_provider(ProviderConfig(
            name="gemini_backup",
            base_url=self.base_url,
            api_key="YOUR_HOLYSHEEP_API_KEY",
            timeout=8.0,
            health_check_interval=45.0,
            failure_threshold=2
        ))
        
        logger.info("✅ Providers HolySheep enregistrés avec succès")
    
    def register_provider(self, config: ProviderConfig):
        """Enregistre un nouveau provider dans le système."""
        self.providers[config.name] = config
        self.metrics[config.name] = HealthMetrics()
        
        if self.current_provider is None:
            self.current_provider = config.name
        else:
            self.fallback_providers.append(config.name)
        
        logger.info(f"📝 Provider '{config.name}' enregistré (URL: {config.base_url})")
    
    async def check_provider_health(self, provider_name: str) -> HealthMetrics:
        """Effectue un health check complet sur un provider."""
        config = self.providers[provider_name]
        metrics = self.metrics[provider_name]
        
        start_time = time.perf_counter()
        
        try:
            async with aiohttp.ClientSession() as session:
                headers = {
                    "Authorization": f"Bearer {config.api_key}",
                    "Content-Type": "application/json"
                }
                
                payload = {
                    "model": "deepseek-v3.2",
                    "messages": [{"role": "user", "content": "ping"}],
                    "max_tokens": 5
                }
                
                async with session.post(
                    f"{config.base_url}/chat/completions",
                    headers=headers,
                    json=payload,
                    timeout=aiohttp.ClientTimeout(total=config.timeout)
                ) as response:
                    
                    latency = (time.perf_counter() - start_time) * 1000
                    metrics.latency_ms = latency
                    metrics.last_check = time.time()
                    
                    if response.status == 200:
                        metrics.consecutive_successes += 1
                        metrics.consecutive_failures = 0
                        
                        # Mise à jour du statut basée sur les seuils
                        if metrics.consecutive_successes >= config.recovery_threshold:
                            metrics.status = ProviderStatus.HEALTHY
                        
                        metrics.error_message = None
                        logger.debug(f"✅ {provider_name} - Latence: {latency:.2f}ms")
                    else:
                        raise aiohttp.ClientResponseError(
                            request_info=response.request_info,
                            history=response.history,
                            status=response.status
                        )
                        
        except asyncio.TimeoutError:
            await self._handle_failure(provider_name, "Timeout dépassé")
        except aiohttp.ClientError as e:
            await self._handle_failure(provider_name, f"Erreur client: {str(e)}")
        except Exception as e:
            await self._handle_failure(provider_name, f"Erreur inconnue: {str(e)}")
        
        return metrics
    
    async def _handle_failure(self, provider_name: str, error: str):
        """Gère les échecs de health check."""
        metrics = self.metrics[provider_name]
        config = self.providers[provider_name]
        
        metrics.consecutive_failures += 1
        metrics.consecutive_successes = 0
        metrics.error_message = error
        metrics.last_check = time.time()
        
        logger.warning(f"⚠️ {provider_name} - Échec #{metrics.consecutive_failures}: {error}")
        
        if metrics.consecutive_failures >= config.failure_threshold:
            metrics.status = ProviderStatus.UNHEALTHY
            logger.error(f"🚨 {provider_name} marqué comme UNHEALTHY")
            
            if provider_name == self.current_provider:
                await self._trigger_failover()
    
    async def _trigger_failover(self):
        """Déclenche le failover vers le prochain provider disponible."""
        logger.warning("🔄 Déclenchement du failover...")
        
        original_provider = self.current_provider
        
        for provider_name in self.fallback_providers:
            if self.metrics[provider_name].status == ProviderStatus.HEALTHY:
                self.current_provider = provider_name
                logger.info(f"✅ Failover terminé: {original_provider} → {provider_name}")
                return
        
        logger.error("🚨 Aucun provider sain disponible!")
    
    async def _health_check_loop(self, provider_name: str):
        """Boucle de health check continue pour un provider."""
        config = self.providers[provider_name]
        
        while self.is_running:
            await self.check_provider_health(provider_name)
            await asyncio.sleep(config.health_check_interval)
    
    async def start_monitoring(self):
        """Démarre la surveillance de tous les providers."""
        self.is_running = True
        
        for provider_name in self.providers:
            task = asyncio.create_task(self._health_check_loop(provider_name))
            self.health_check_tasks.append(task)
        
        logger.info("🚀 Monitoring démarré pour tous les providers")
    
    async def stop_monitoring(self):
        """Arrête la surveillance de tous les providers."""
        self.is_running = False
        
        for task in self.health_check_tasks:
            task.cancel()
        
        await asyncio.gather(*self.health_check_tasks, return_exceptions=True)
        self.health_check_tasks.clear()
        
        logger.info("🛑 Monitoring arrêté")
    
    def get_best_provider(self) -> str:
        """Retourne le meilleur provider disponible."""
        if self.metrics[self.current_provider].status == ProviderStatus.HEALTHY:
            return self.current_provider
        
        for provider_name in self.fallback_providers:
            if self.metrics[provider_name].status == ProviderStatus.HEALTHY:
                return provider_name
        
        return self.current_provider
    
    def get_system_status(self) -> Dict:
        """Retourne le statut global du système."""
        return {
            "current_provider": self.current_provider,
            "providers": {
                name: {
                    "status": metrics.status.value,
                    "latency_ms": round(metrics.latency_ms, 2),
                    "success_rate": f"{metrics.success_rate:.1f}%",
                    "last_check": metrics.last_check,
                    "error": metrics.error_message
                }
                for name, metrics in self.metrics.items()
            }
        }


Exemple d'utilisation
async def main():
    health_monitor = HolySheepHealthCheck()
    
    # Démarrage du monitoring
    await health_monitor.start_monitoring()
    
    # Surveillance pendant 60 secondes
    for i in range(12):
        await asyncio.sleep(5)
        status = health_monitor.get_system_status()
        print(f"\n📊 Statut système #{i+1}:")
        print(json.dumps(status, indent=2))
    
    await health_monitor.stop_monitoring()

if __name__ == "__main__":
    asyncio.run(main())

Implémentation du Client avec Retry Automatique

Cette seconde implémentation montre comment créer un client robuste avec retry exponentiel et circuit breaker intégré. Le circuit breaker s'ouvre automatiquement après 5 échecs consécutifs et se referme après 3 succès.

/**
 * HolySheep AI - Client robuste avec Health Check et Failover
 * Version: 2.0.0 (2026)
 * Support: Node.js 18+ et Deno
 */

const HOLYSHEEP_BASE_URL = 'https://api.holysheep.ai/v1';

class CircuitBreaker {
    constructor(options = {}) {
        this.failureThreshold = options.failureThreshold || 5;
        this.successThreshold = options.successThreshold || 3;
        this.timeout = options.timeout || 60000;
        
        this.state = 'CLOSED';
        this.failures = 0;
        this.successes = 0;
        this.nextAttempt = Date.now();
    }
    
    async execute(fn) {
        if (this.state === 'OPEN') {
            if (Date.now() < this.nextAttempt) {
                throw new Error('CircuitBreaker: Circuit is OPEN');
            }
            this.state = 'HALF_OPEN';
        }
        
        try {
            const result = await fn();
            this.onSuccess();
            return result;
        } catch (error) {
            this.onFailure();
            throw error;
        }
    }
    
    onSuccess() {
        this.failures = 0;
        this.successes++;
        
        if (this.state === 'HALF_OPEN' && this.successes >= this.successThreshold) {
            this.state = 'CLOSED';
            console.log('🔄 CircuitBreaker: Circuit CLOSED après récupération');
        }
    }
    
    onFailure() {
        this.failures++;
        this.successes = 0;
        
        if (this.failures >= this.failureThreshold) {
            this.state = 'OPEN';
            this.nextAttempt = Date.now() + this.timeout;
            console.error('🚨 CircuitBreaker: Circuit OPEN après failures');
        }
    }
}

class HolySheepHealthCheck {
    constructor(apiKey) {
        this.apiKey = apiKey;
        this.baseUrl = HOLYSHEEP_BASE_URL;
        
        this.providers = {
            deepseek: {
                model: 'deepseek-v3.2',
                circuitBreaker: new CircuitBreaker({ failureThreshold: 5 }),
                healthy: true,
                latencyMs: 0,
                lastCheck: null
            },
            gemini: {
                model: 'gemini-2.5-flash',
                circuitBreaker: new CircuitBreaker({ failureThreshold: 3 }),
                healthy: true,
                latencyMs: 0,
                lastCheck: null
            }
        };
        
        this.currentProvider = 'deepseek';
        this.healthCheckInterval = null;
        this.onFailoverCallback = null;
    }
    
    async checkHealth(providerName) {
        const provider = this.providers[providerName];
        const startTime = performance.now();
        
        try {
            const response = await fetch(${this.baseUrl}/chat/completions, {
                method: 'POST',
                headers: {
                    'Authorization': Bearer ${this.apiKey},
                    'Content-Type': 'application/json'
                },
                body: JSON.stringify({
                    model: provider.model,
                    messages: [{ role: 'user', content: 'health_check' }],
                    max_tokens: 5
                })
            });
            
            const latencyMs = performance.now() - startTime;
            provider.latencyMs = latencyMs;
            provider.lastCheck = Date.now();
            
            if (response.ok) {
                provider.healthy = true;
                console.log(✅ ${providerName} healthy - Latence: ${latencyMs.toFixed(2)}ms);
                return { success: true, latencyMs };
            }
            
            throw new Error(HTTP ${response.status});
            
        } catch (error) {
            provider.lastCheck = Date.now();
            console.error(⚠️ ${providerName} health check failed: ${error.message});
            return { success: false, error: error.message };
        }
    }
    
    async performHealthChecks() {
        const results = {};
        
        for (const providerName of Object.keys(this.providers)) {
            results[providerName] = await this.checkHealth(providerName);
            
            // Mise à jour de la santé du circuit breaker
            if (!results[providerName].success) {
                this.providers[providerName].circuitBreaker.failures++;
            }
        }
        
        // Déterminer le meilleur provider
        this.updateActiveProvider(results);
    }
    
    updateActiveProvider(results) {
        const previousProvider = this.currentProvider;
        
        // Priorité: deepseek (moins cher, plus rapide) > gemini
        if (results.deepseek?.success) {
            this.currentProvider = 'deepseek';
        } else if (results.gemini?.success) {
            this.currentProvider = 'gemini';
        }
        
        if (previousProvider !== this.currentProvider && this.onFailoverCallback) {
            this.onFailoverCallback(previousProvider, this.currentProvider);
        }
    }
    
    startMonitoring(intervalMs = 30000) {
        console.log(🚀 Démarrage du monitoring (intervalle: ${intervalMs}ms));
        
        // Health check initial
        this.performHealthChecks();
        
        // Boucle de monitoring
        this.healthCheckInterval = setInterval(() => {
            this.performHealthChecks();
        }, intervalMs);
    }
    
    stopMonitoring() {
        if (this.healthCheckInterval) {
            clearInterval(this.healthCheckInterval);
            this.healthCheckInterval = null;
            console.log('🛑 Monitoring arrêté');
        }
    }
    
    onFailover(callback) {
        this.onFailoverCallback = callback;
    }
    
    getSystemStatus() {
        return {
            currentProvider: this.currentProvider,
            providers: Object.entries(this.providers).map(([name, data]) => ({
                name,
                model: data.model,
                healthy: data.healthy,
                latencyMs: data.latencyMs.toFixed(2),
                lastCheck: data.lastCheck ? new Date(data.lastCheck).toISOString() : null,
                circuitState: data.circuitBreaker.state
            }))
        };
    }
}

class HolySheepClient {
    constructor(apiKey, options = {}) {
        this.apiKey = apiKey;
        this.baseUrl = HOLYSHEEP_BASE_URL;
        this.maxRetries = options.maxRetries || 3;
        this.retryDelay = options.retryDelay || 1000;
        
        this.healthCheck = new HolySheepHealthCheck(apiKey);
        
        // Configuration du failover
        this.healthCheck.onFailover((from, to) => {
            console.log(🔄 Failover: ${from} → ${to});
        });
        
        this.healthCheck.startMonitoring(30000);
    }
    
    async chatCompletion(messages, options = {}) {
        const provider = this.healthCheck.providers[this.healthCheck.currentProvider];
        const model = options.model || provider.model;
        
        let lastError;
        
        for (let attempt = 1; attempt <= this.maxRetries; attempt++) {
            try {
                // Exécution via circuit breaker
                const result = await provider.circuitBreaker.execute(async () => {
                    const response = await fetch(${this.baseUrl}/chat/completions, {
                        method: 'POST',
                        headers: {
                            'Authorization': Bearer ${this.apiKey},
                            'Content-Type': 'application/json'
                        },
                        body: JSON.stringify({
                            model,
                            messages,
                            temperature: options.temperature || 0.7,
                            max_tokens: options.maxTokens || 2048,
                            ...options.extraParams
                        })
                    });
                    
                    if (!response.ok) {
                        throw new Error(HTTP ${response.status}: ${await response.text()});
                    }
                    
                    return await response.json();
                });
                
                return {
                    success: true,
                    data: result,
                    provider: this.healthCheck.currentProvider,
                    model
                };
                
            } catch (error) {
                lastError = error;
                console.error(❌ Tentative ${attempt}/${this.maxRetries} échouée: ${error.message});
                
                if (attempt < this.maxRetries) {
                    const delay = this.retryDelay * Math.pow(2, attempt - 1);
                    await new Promise(resolve => setTimeout(resolve, delay));
                    
                    // Health check entre les retries
                    await this.healthCheck.performHealthChecks();
                }
            }
        }
        
        return {
            success: false,
            error: lastError.message,
            provider: this.healthCheck.currentProvider,
            attempts: this.maxRetries
        };
    }
    
    async *streamChatCompletion(messages, options = {}) {
        const provider = this.healthCheck.providers[this.healthCheck.currentProvider];
        const model = options.model || provider.model;
        
        try {
            const response = await fetch(${this.baseUrl}/chat/completions, {
                method: 'POST',
                headers: {
                    'Authorization': Bearer ${this.apiKey},
                    'Content-Type': 'application/json'
                },
                body: JSON.stringify({
                    model,
                    messages,
                    stream: true,
                    temperature: options.temperature || 0.7,
                    max_tokens: options.maxTokens || 2048
                })
            });
            
            if (!response.ok) {
                throw new Error(HTTP ${response.status});
            }
            
            const reader = response.body.getReader();
            const decoder = new TextDecoder();
            
            while (true) {
                const { done, value } = await reader.read();
                if (done) break;
                
                const chunk = decoder.decode(value);
                const lines = chunk.split('\n');
                
                for (const line of lines) {
                    if (line.startsWith('data: ')) {
                        const data = line.slice(6);
                        if (data === '[DONE]') return;
                        yield JSON.parse(data);
                    }
                }
            }
            
        } catch (error) {
            console.error(❌ Erreur stream: ${error.message});
            throw error;
        }
    }
    
    getStatus() {
        return this.healthCheck.getSystemStatus();
    }
    
    close() {
        this.healthCheck.stopMonitoring();
    }
}

// Exemple d'utilisation
async function demo() {
    const client = new HolySheepClient('YOUR_HOLYSHEEP_API_KEY', {
        maxRetries: 3,
        retryDelay: 1000
    });
    
    // Chat completion simple
    const result = await client.chatCompletion([
        { role: 'user', content: 'Explique-moi les avantages de HolySheep AI' }
    ], {
        temperature: 0.7,
        maxTokens: 500
    });
    
    if (result.success) {
        console.log('📝 Réponse:', result.data.choices[0].message.content);
        console.log('🏭 Provider utilisé:', result.provider);
    }
    
    // Affichage du statut
    console.log('\n📊 Statut système:', JSON.stringify(client.getStatus(), null, 2));
    
    // Fermeture propre
    client.close();
}

export { HolySheepClient, HolySheepHealthCheck, CircuitBreaker };

Tableau de Bord de Monitoring en Temps Réel

/**
 * HolySheep AI - Dashboard de Monitoring en Temps Réel
 * Version: 2026
 */

interface ProviderMetrics {
    name: string;
    status: 'healthy' | 'degraded' | 'unhealthy';
    latency: number;
    requestsTotal: number;
    requestsSuccess: number;
    requestsFailed: number;
    lastHealthCheck: Date;
    uptimePercentage: number;
}

interface SystemHealth {
    overallStatus: 'operational' | 'degraded' | 'outage';
    activeProvider: string;
    totalRequests: number;
    averageLatency: number;
    failoverCount: number;
    providers: ProviderMetrics[];
}

class HealthDashboard {
    private metrics: Map = new Map();
    private events: Array<{ timestamp: Date; type: string; provider: string; details: string }> = [];
    private failoverHistory: Array<{ from: string; to: string; timestamp: Date }> = [];
    
    constructor() {
        this.initializeProviders();
    }
    
    private initializeProviders() {
        // Configuration des providers HolySheep
        const providerConfigs = [
            {
                name: 'deepseek-v3.2',
                displayName: 'DeepSeek V3.2 (Principal)',
                pricePerMTok: 0.42,
                latencyTarget: 50
            },
            {
                name: 'gemini-2.5-flash',
                displayName: 'Gemini 2.5 Flash (Secours)',
                pricePerMTok: 2.50,
                latencyTarget: 80
            },
            {
                name: 'gpt-4.1',
                displayName: 'GPT-4.1 (Backup)',
                pricePerMTok: 8.00,
                latencyTarget: 120
            }
        ];
        
        providerConfigs.forEach(config => {
            this.metrics.set(config.name, {
                name: config.displayName,
                status: 'healthy',
                latency: 0,
                requestsTotal: 0,
                requestsSuccess: 0,
                requestsFailed: 0,
                lastHealthCheck: new Date(),
                uptimePercentage: 100
            });
        });
    }
    
    public recordRequest(provider: string, success: boolean, latencyMs: number) {
        const metrics = this.metrics.get(provider);
        if (!metrics) return;
        
        metrics.requestsTotal++;
        metrics.latency = latencyMs;
        metrics.lastHealthCheck = new Date();
        
        if (success) {
            metrics.requestsSuccess++;
        } else {
            metrics.requestsFailed++;
            this.addEvent('request_failed', provider, Latence: ${latencyMs}ms);
        }
        
        this.updateUptime(provider);
    }
    
    public recordHealthCheck(provider: string, healthy: boolean, latencyMs: number) {
        const metrics = this.metrics.get(provider);
        if (!metrics) return;
        
        metrics.latency = latencyMs;
        metrics.lastHealthCheck = new Date();
        
        if (healthy) {
            if (metrics.status === 'unhealthy') {
                this.addEvent('recovery', provider, 'Provider recovered');
            }
            metrics.status = 'healthy';
        } else {
            metrics.status = 'unhealthy';
            this.addEvent('health_check_failed', provider, Latence: ${latencyMs}ms);
        }
    }
    
    public recordFailover(from: string, to: string) {
        this.failoverHistory.push({ from, to, timestamp: new Date() });
        this.addEvent('failover', from, Basculement vers ${to});
    }
    
    private updateUptime(provider: string) {
        const metrics = this.metrics.get(provider);
        if (!metrics) return;
        
        const total = metrics.requestsTotal;
        const success = metrics.requestsSuccess;
        
        metrics.uptimePercentage = total > 0 ? (success / total) * 100 : 100;
    }
    
    private addEvent(type: string, provider: string, details: string) {
        this.events.push({
            timestamp: new Date(),
            type,
            provider,
            details
        });
        
        // Garder seulement les 100 derniers événements
        if (this.events.length > 100) {
            this.events.shift();
        }
    }
    
    public getSystemHealth(): SystemHealth {
        const healthyProviders = Array.from(this.metrics.values())
            .filter(p => p.status === 'healthy');
        
        let overallStatus: 'operational' | 'degraded' | 'outage' = 'operational';
        
        if (healthyProviders.length === 0) {
            overallStatus = 'outage';
        } else if (healthyProviders.length < this.metrics.size) {
            overallStatus = 'degraded';
        }
        
        const totalRequests = Array.from(this.metrics.values())
            .reduce((sum, p) => sum + p.requestsTotal, 0);
        
        const weightedLatency = Array.from(this.metrics.values())
            .reduce((sum, p) => sum + p.latency * p.requestsTotal, 0);
        
        return {
            overallStatus,
            activeProvider: this.getActiveProvider(),
            totalRequests,
            averageLatency: totalRequests > 0 ? weightedLatency / totalRequests : 0,
            failoverCount: this.failoverHistory.length,
            providers: Array.from(this.metrics.values())
        };
    }
    
    private getActiveProvider(): string {
        // Retourne le provider principal (deepseek-v3.2)
        const primary = this.metrics.get('deepseek-v3.2');
        return primary?.status === 'healthy' ? 'deepseek-v3.2' : 'gemini-2.5-flash';
    }
    
    public generateReport(): string {
        const health = this.getSystemHealth();
        
        const statusEmoji = {
            'operational': '✅',
            'degraded': '⚠️',
            'outage': '🚨'
        };
        
        let report = `
╔══════════════════════════════════════════════════════════════╗
║           HOLYSHEEP AI - RAPPORT DE SANTÉ SYSTÈME            ║
║                      ${new Date().toISOString()}                   ║
╠══════════════════════════════════════════════════════════════╣
║  Statut Global: ${statusEmoji[health.overallStatus]} ${health.overallStatus.toUpperCase().padEnd(46)}║
║  Provider Actif: ${health.activeProvider.padEnd(46)}║
║  Requêtes Totales: ${health.totalRequests.toString().padEnd(40)}║
║  Latence Moyenne: ${health.averageLatency.toFixed(2)}ms.padEnd(62) + ║
║  Failovers: ${health.failoverCount.toString().padEnd(54)}║
╠══════════════════════════════════════════════════════════════╣
║  DÉTAILS PAR PROVIDER                                       ║`;
        
        health.providers.forEach(provider => {
            const statusIcon = provider.status === 'healthy' ? '🟢' : 
                              provider.status === 'degraded' ? '🟡' : '🔴';
            
            report += `
║  ${statusIcon} ${provider.name.padEnd(56)}║
║    Latence: ${provider.latency.toFixed(2).padEnd(5)}ms | Uptime: ${provider.uptimePercentage.toFixed(2)}%.padEnd(62) + ║
║    Requêtes: ${provider.requestsTotal.toString().padEnd(6)} | Succès: ${provider.requestsSuccess.toString().padEnd(6)} | Échecs: ${provider.requestsFailed.toString().padEnd(6)}.padEnd(62) + ║`;
        });
        
        report += `
╚══════════════════════════════════════════════════════════════╝`;
        
        return report;
    }
    
    public getMetrics(): Map {
        return this.metrics;
    }
    
    public getEvents(limit: number = 20): Array {
        return this.events.slice(-limit).reverse();
    }
}

// Export pour Node.js / bundlers
export { HealthDashboard, ProviderMetrics, SystemHealth };

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