docs: def agent_leave(consul_url=None, token=None, node=None):
      '''
      Used to instruct the agent to force a node into the left state.
  
      :param consul_url: The Consul server URL.
      :param node: The node the agent will force into left state
      :return: Boolean and message indicating success or failure.
  
      CLI Example:
  
      .. code-block:: bash
  
          salt '*' consul.agent_leave node='web1.example.com'
  
      '''
      ret = {}
      query_params = {}
      if not consul_url:
          consul_url = _get_config()
          if not consul_url:
              log.error('No Consul URL found.')
              ret['message'] = 'No Consul URL found.'
              ret['res'] = False
              return ret
  
      if not node:
          raise SaltInvocationError('Required argument "node" is missing.')
  
      function = 'agent/force-leave/{0}'.format(node)
      res = _query(consul_url=consul_url,
                   function=function,
                   token=token,
                   method='GET',
                   query_params=query_params)
      if res['res']:
          ret['res'] = True
          ret['message'] = 'Node {0} put in leave state.'.format(node)
      else:
          ret['res'] = False
          ret['message'] = 'Unable to change state for {0}.'.format(node)
      return ret