/**
 * O5: Structured logger with service context and log level filtering.
 */
export declare class Logger {
    serviceName: string;
    workerId: number;
    _level: number;
    _redactedFields: Set<string>;
    constructor(serviceName: string, workerId: number);
    /**
     * O5: Set the log level dynamically.
     */
    setLogLevel(level: "error" | "warn" | "info" | "debug"): void;
    _log(level: string, message: string, meta?: Record<string, unknown>): void;
    debug(msg: string, meta?: Record<string, unknown>): void;
    info(msg: string, meta?: Record<string, unknown>): void;
    warn(msg: string, meta?: Record<string, unknown>): void;
    error(msg: string, meta?: Record<string, unknown>): void;
}
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