/**
 * Alert Manager
 *
 * Sends alerts for security and compliance events.
 * Supports multiple channels: console, file, webhook, email.
 *
 * Added by Pantheon Security for enterprise compliance support.
 */
import type { Alert, AlertConfig, AlertSeverity } from "./types.js";
/**
 * Alert Manager class
 */
export declare class AlertManager {
    private static instance;
    private config;
    private alertHistory;
    private hourlyAlerts;
    private recentAlerts;
    private alertsDir;
    private constructor();
    /**
     * Get singleton instance
     */
    static getInstance(): AlertManager;
    /**
     * Check if alert should be sent based on severity
     */
    private meetsMinimumSeverity;
    /**
     * Check if alert is within cooldown period
     */
    private isInCooldown;
    /**
     * Check if hourly limit is exceeded
     */
    private isHourlyLimitExceeded;
    /**
     * Record that an alert was sent. When a severity is provided the alert is
     * also added to the 24h rolling window used for dashboard metrics; internal
     * bookkeeping keys (e.g. the rate-limit warning) omit it.
     */
    private recordAlert;
    /**
     * Generate a unique key for deduplication
     */
    private generateKey;
    /**
     * Send an alert
     */
    sendAlert(severity: AlertSeverity, title: string, message: string, source: string, details?: Record<string, unknown>): Promise<Alert | null>;
    /**
     * Send alert to console
     */
    private sendToConsole;
    /**
     * Send alert to file
     */
    private sendToFile;
    /**
     * Send alert to webhook
     */
    private sendToWebhook;
    /**
     * Format webhook body for common services (Slack, Teams, generic)
     */
    private formatWebhookBody;
    /**
     * Get severity icon
     */
    private getSeverityIcon;
    /**
     * Get severity color (for webhooks)
     */
    private getSeverityColor;
    /**
     * Send a critical alert
     */
    critical(title: string, message: string, source: string, details?: Record<string, unknown>): Promise<Alert | null>;
    /**
     * Send an error alert
     */
    error(title: string, message: string, source: string, details?: Record<string, unknown>): Promise<Alert | null>;
    /**
     * Send a warning alert
     */
    warning(title: string, message: string, source: string, details?: Record<string, unknown>): Promise<Alert | null>;
    /**
     * Send an info alert
     */
    info(title: string, message: string, source: string, details?: Record<string, unknown>): Promise<Alert | null>;
    /**
     * Get alert statistics
     */
    getStats(): {
        enabled: boolean;
        min_severity: AlertSeverity;
        cooldown_seconds: number;
        max_alerts_per_hour: number;
        alerts_this_hour: number;
        alerts_24h: number;
        critical_24h: number;
        channels: string[];
    };
    /**
     * Update configuration at runtime
     */
    updateConfig(updates: Partial<AlertConfig>): void;
}
/**
 * Get the alert manager instance
 */
export declare function getAlertManager(): AlertManager;
/**
 * Send an alert
 */
export declare function sendAlert(severity: AlertSeverity, title: string, message: string, source: string, details?: Record<string, unknown>): Promise<Alert | null>;
/**
 * Send a critical alert
 */
export declare function alertCritical(title: string, message: string, source: string, details?: Record<string, unknown>): Promise<Alert | null>;
/**
 * Send a warning alert
 */
export declare function alertWarning(title: string, message: string, source: string, details?: Record<string, unknown>): Promise<Alert | null>;