'Logs the error rate to the debug() log, useful to understand why a scan
fails with "Too many consecutive errors"
:see: https://github.com/andresriancho/w3af/issues/8698'

def _log_error_rate(self):

    error_rate = self.get_error_rate()
    om.out.debug(('ExtendedUrllib    error    rate    is    at    %i%%' % error_rate))
