code: async def services(self, *, dc=None, watch=None, consistency=None):
          
          params = {"dc": dc}
          response = await self._api.get("/v1/catalog/services",
                                         params=params,
                                         watch=watch,
                                         consistency=consistency)
          return consul(response)
docs: Lists services in a given DC
  
          Parameters:
              dc (str): Specify datacenter that will be used.
                        Defaults to the agent's local datacenter.
              watch (Blocking): Do a blocking query
              consistency (Consistency): Force consistency
          Returns:
              ObjectMeta: where value is a dict
  
          It returns a JSON body like this::
  
              {
                "consul": [],
                "redis": [],
                "postgresql": [
                  "master",
                  "slave"
                ]
              }
  
          The keys are the service names, and the array values provide all known
          tags for a given service.