abstract class Logger { static late Logger _logger; static Logger getInstance() { return _logger; } static void setInstance(Logger logger) { _logger = logger; } void debug(String msg, {String? tag, String? traceId, String? spanId, String? parentSpanId, Map? lable}); void info(String msg, {String? tag, String? traceId, String? spanId, String? parentSpanId, Map? lable}); void warning(String msg, {String? tag, String? traceId, String? spanId, String? parentSpanId, Map? lable}); void error(String msg, {String? tag, String? traceId, String? spanId, String? parentSpanId, Map? lable}); } class LoggerConfig { String host; String serviceName; Map? lables; bool print; LoggerConfig( {required this.host, required this.serviceName, this.print = false, this.lables}); }