def get_message_start(self, formatted, levelno):
        """
        Return the start of the formatted log message (not counting the
        prefix to add to each line).
        """
        if levelno < logging.WARNING:
            return ''
        if formatted.startswith(DEPRECATION_MSG_PREFIX):
            # Then the message already has a prefix.  We don't want it to
            # look like "WARNING: DEPRECATION: ...."
            return ''
        if levelno < logging.ERROR:
            return 'WARNING: '

        return 'ERROR: '

        Return the start of the formatted log message (not counting the
        prefix to add to each line).
        
product/gradle-plugin/src/main/python/pip/_internal/utils/logging.py