code: func NewFileLog(cfg FileLogConfig) (*FileLog, error) {
  	if err := cfg.CheckAndSetDefaults(); err != nil {
  		return nil, trace.Wrap(err)
  	}
  	f := &FileLog{
  		FileLogConfig: cfg,
  		Entry: log.WithFields(log.Fields{
  			trace.Component: teleport.ComponentAuditLog,
  		}),
  	}
  	return f, nil
  }
docs: // NewFileLog returns a new instance of a file log