import pino from 'pino';
/**
 * Base logger instance
 *
 * In development: Uses pino-pretty with colorized output
 * In production: JSON logs to stdout (captured by journald) + optional file
 *
 * Configure via environment variables:
 * - LOG_LEVEL: trace, debug, info, warn, error, fatal (default: debug in dev, info in prod)
 * - LOG_FILE: Path to log file (default: /var/log/zn-vault-agent/agent.log in prod)
 */
export declare const logger: pino.Logger<never, boolean>;
/**
 * Create a child logger with additional context
 *
 * @example
 * const log = createLogger({ module: 'deployer' });
 * log.info({ certId: 'xxx' }, 'Certificate deployed');
 */
export declare function createLogger(context: Record<string, unknown>): pino.Logger;
export declare const wsLogger: pino.Logger<never, boolean>;
export declare const apiLogger: pino.Logger<never, boolean>;
export declare const deployLogger: pino.Logger<never, boolean>;
export declare const configLogger: pino.Logger<never, boolean>;
export declare const metricsLogger: pino.Logger<never, boolean>;
export declare const healthLogger: pino.Logger<never, boolean>;
export declare const execLogger: pino.Logger<never, boolean>;
/**
 * Flush logs and close file streams
 * Call this before process exit for clean shutdown
 */
export declare function flushLogs(): Promise<void>;
/**
 * Handle log rotation signal (USR1)
 * Reopens the log file destination
 */
export declare function setupLogRotation(): void;
export type Logger = pino.Logger;
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