def METHOD_NAME(self, tracker_url):
    """
    Gets the tracker information with the given tracker URL.
    :param tracker_url: The given tracker URL.
    :return: The tracker info dict if exists, None otherwise.
    """
    sanitized_tracker_url = get_uniformed_tracker_url(tracker_url) if tracker_url != "DHT" else tracker_url
    with db_session:
        tracker = list(self.TrackerState.select(lambda g: g.url == sanitized_tracker_url))
        if tracker:
            return {
                'id': tracker[0].url,
                'last_check': tracker[0].last_check,
                'failures': tracker[0].failures,
                'is_alive': tracker[0].alive
            }
        return None