📊 Implement Comprehensive Monitoring and Analytics System

monitoring/alerts/alert-manager.js

@@ -0,0 +1,368 @@
+/**
+ * Alert Manager
+ * Handles alert generation, notification, and management
+ */
+
+import EventEmitter from 'events';
+
+export class AlertManager extends EventEmitter {
+  constructor(config) {
+    super();
+    this.config = config;
+    this.activeAlerts = new Map();
+    this.alertHistory = [];
+    this.notificationChannels = new Map();
+    this.initialized = false;
+  }
+
+  /**
+   * Initialize the alert manager
+   */
+  async initialize() {
+    if (this.initialized) {
+      return;
+    }
+
+    this.setupNotificationChannels();
+    this.initialized = true;
+    console.log('🚨 Alert manager initialized');
+  }
+
+  /**
+   * Setup notification channels
+   */
+  setupNotificationChannels() {
+    // Console notification channel (always available)
+    this.notificationChannels.set('console', {
+      send: this.sendConsoleNotification.bind(this)
+    });
+
+    // Email notification channel (placeholder)
+    this.notificationChannels.set('email', {
+      send: this.sendEmailNotification.bind(this)
+    });
+
+    // Webhook notification channel (placeholder)
+    this.notificationChannels.set('webhook', {
+      send: this.sendWebhookNotification.bind(this)
+    });
+
+    // Slack notification channel (placeholder)
+    this.notificationChannels.set('slack', {
+      send: this.sendSlackNotification.bind(this)
+    });
+  }
+
+  /**
+   * Trigger an alert
+   */
+  async triggerAlert(alertData) {
+    const alert = {
+      id: this.generateAlertId(),
+      timestamp: Date.now(),
+      status: 'active',
+      ...alertData
+    };
+
+    // Check if this is a duplicate alert
+    const existingAlert = this.findSimilarAlert(alert);
+    if (existingAlert) {
+      await this.updateAlert(existingAlert.id, {
+        count: (existingAlert.count || 1) + 1,
+        lastSeen: alert.timestamp
+      });
+      return existingAlert.id;
+    }
+
+    // Store the alert
+    this.activeAlerts.set(alert.id, alert);
+    this.alertHistory.push({ ...alert });
+
+    // Send notifications
+    await this.sendNotifications(alert);
+
+    // Emit alert event
+    this.emit('alert_triggered', alert);
+
+    console.log(`🚨 Alert triggered: ${alert.type} - ${alert.metric || 'N/A'}`);
+    return alert.id;
+  }
+
+  /**
+   * Resolve an alert
+   */
+  async resolveAlert(alertId, resolution = 'manual') {
+    const alert = this.activeAlerts.get(alertId);
+    if (!alert) {
+      throw new Error(`Alert not found: ${alertId}`);
+    }
+
+    alert.status = 'resolved';
+    alert.resolvedAt = Date.now();
+    alert.resolution = resolution;
+
+    this.activeAlerts.delete(alertId);
+
+    // Send resolution notification
+    await this.sendResolutionNotification(alert);
+
+    // Emit resolution event
+    this.emit('alert_resolved', alert);
+
+    console.log(`✅ Alert resolved: ${alertId}`);
+  }
+
+  /**
+   * Update an existing alert
+   */
+  async updateAlert(alertId, updates) {
+    const alert = this.activeAlerts.get(alertId);
+    if (!alert) {
+      throw new Error(`Alert not found: ${alertId}`);
+    }
+
+    Object.assign(alert, updates);
+    this.emit('alert_updated', alert);
+  }
+
+  /**
+   * Find similar active alert
+   */
+  findSimilarAlert(newAlert) {
+    for (const alert of this.activeAlerts.values()) {
+      if (
+        alert.type === newAlert.type &&
+        alert.metric === newAlert.metric &&
+        alert.status === 'active'
+      ) {
+        return alert;
+      }
+    }
+    return null;
+  }
+
+  /**
+   * Send notifications for an alert
+   */
+  async sendNotifications(alert) {
+    const severity = this.getAlertSeverity(alert);
+    const channels = this.getNotificationChannels(severity);
+
+    for (const channel of channels) {
+      try {
+        const notifier = this.notificationChannels.get(channel);
+        if (notifier) {
+          await notifier.send(alert);
+        }
+      } catch (error) {
+        console.error(`Failed to send notification via ${channel}:`, error);
+      }
+    }
+  }
+
+  /**
+   * Send resolution notification
+   */
+  async sendResolutionNotification(alert) {
+    const message = {
+      ...alert,
+      type: 'alert_resolved',
+      message: `Alert resolved: ${alert.type}`
+    };
+
+    // Send to console by default
+    await this.sendConsoleNotification(message);
+  }
+
+  /**
+   * Get alert severity level
+   */
+  getAlertSeverity(alert) {
+    if (alert.type === 'threshold_exceeded') {
+      const value = alert.value || 0;
+      const threshold = alert.threshold || 0;
+      const ratio = value / threshold;
+
+      if (ratio >= 2) return 'critical';
+      if (ratio >= 1.5) return 'high';
+      if (ratio >= 1.2) return 'medium';
+      return 'low';
+    }
+
+    return 'medium'; // Default severity
+  }
+
+  /**
+   * Get notification channels for severity
+   */
+  getNotificationChannels(severity) {
+    switch (severity) {
+      case 'critical':
+        return ['console', 'email', 'slack', 'webhook'];
+      case 'high':
+        return ['console', 'email', 'slack'];
+      case 'medium':
+        return ['console', 'slack'];
+      case 'low':
+        return ['console'];
+      default:
+        return ['console'];
+    }
+  }
+
+  /**
+   * Console notification
+   */
+  async sendConsoleNotification(alert) {
+    const severity = this.getAlertSeverity(alert);
+    const emoji = this.getSeverityEmoji(severity);
+    const timestamp = new Date(alert.timestamp).toISOString();
+
+    console.log(`${emoji} [${severity.toUpperCase()}] ${timestamp}`);
+    console.log(`   Type: ${alert.type}`);
+    if (alert.metric) console.log(`   Metric: ${alert.metric}`);
+    if (alert.value !== undefined) console.log(`   Value: ${alert.value}`);
+    if (alert.threshold !== undefined) console.log(`   Threshold: ${alert.threshold}`);
+    if (alert.message) console.log(`   Message: ${alert.message}`);
+    console.log('');
+  }
+
+  /**
+   * Email notification (placeholder)
+   */
+  async sendEmailNotification(alert) {
+    // Placeholder for email notification implementation
+    console.log(`📧 Email notification would be sent for alert: ${alert.id}`);
+  }
+
+  /**
+   * Webhook notification (placeholder)
+   */
+  async sendWebhookNotification(alert) {
+    // Placeholder for webhook notification implementation
+    console.log(`🔗 Webhook notification would be sent for alert: ${alert.id}`);
+  }
+
+  /**
+   * Slack notification (placeholder)
+   */
+  async sendSlackNotification(alert) {
+    // Placeholder for Slack notification implementation
+    console.log(`💬 Slack notification would be sent for alert: ${alert.id}`);
+  }
+
+  /**
+   * Get emoji for severity level
+   */
+  getSeverityEmoji(severity) {
+    const emojis = {
+      critical: '🔴',
+      high: '🟠',
+      medium: '🟡',
+      low: '🟢'
+    };
+    return emojis[severity] || '⚪';
+  }
+
+  /**
+   * Generate unique alert ID
+   */
+  generateAlertId() {
+    return `alert_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
+  }
+
+  /**
+   * Get active alerts
+   */
+  getActiveAlerts() {
+    return Array.from(this.activeAlerts.values());
+  }
+
+  /**
+   * Get alert history
+   */
+  getAlertHistory(limit = 100) {
+    return this.alertHistory.slice(-limit);
+  }
+
+  /**
+   * Get alert statistics
+   */
+  getAlertStats() {
+    const now = Date.now();
+    const oneHour = 60 * 60 * 1000;
+    const oneDay = 24 * oneHour;
+
+    const recentAlerts = this.alertHistory.filter(
+      alert => now - alert.timestamp < oneHour
+    );
+    const dailyAlerts = this.alertHistory.filter(
+      alert => now - alert.timestamp < oneDay
+    );
+
+    return {
+      active_alerts: this.activeAlerts.size,
+      total_alerts: this.alertHistory.length,
+      alerts_last_hour: recentAlerts.length,
+      alerts_last_day: dailyAlerts.length,
+      alert_types: this.getAlertTypeStats(),
+      severity_distribution: this.getSeverityStats()
+    };
+  }
+
+  /**
+   * Get alert type statistics
+   */
+  getAlertTypeStats() {
+    const stats = {};
+    for (const alert of this.alertHistory) {
+      stats[alert.type] = (stats[alert.type] || 0) + 1;
+    }
+    return stats;
+  }
+
+  /**
+   * Get severity statistics
+   */
+  getSeverityStats() {
+    const stats = {};
+    for (const alert of this.alertHistory) {
+      const severity = this.getAlertSeverity(alert);
+      stats[severity] = (stats[severity] || 0) + 1;
+    }
+    return stats;
+  }
+
+  /**
+   * Clean up old alerts from history
+   */
+  cleanupHistory(maxAge = 30 * 24 * 60 * 60 * 1000) { // 30 days
+    const cutoff = Date.now() - maxAge;
+    const originalLength = this.alertHistory.length;
+
+    this.alertHistory = this.alertHistory.filter(
+      alert => alert.timestamp >= cutoff
+    );
+
+    const removed = originalLength - this.alertHistory.length;
+    if (removed > 0) {
+      console.log(`🧹 Cleaned up ${removed} old alerts from history`);
+    }
+  }
+
+  /**
+   * Close alert manager
+   */
+  async close() {
+    // Resolve all active alerts
+    for (const alertId of this.activeAlerts.keys()) {
+      await this.resolveAlert(alertId, 'system_shutdown');
+    }
+
+    this.initialized = false;
+    console.log('🚨 Alert manager closed');
+  }
+}
+
+export default AlertManager;
+