code: async def keys(self, prefix, *,
                     dc=None, separator=None, watch=None, consistency=None):
          
          response = await self._read(prefix,
                                      dc=dc,
                                      separator=separator,
                                      keys=True,
                                      watch=watch,
                                      consistency=consistency)
          return consul(response)
docs: Returns a list of the keys under the given prefix
  
          Parameters:
              prefix (str): Prefix to fetch
              separator (str): List only up to a given separator
              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:
              CollectionMeta: where value is list of keys
  
          For example, listing ``/web/`` with a ``/`` separator may return::
  
              [
                "/web/bar",
                "/web/foo",
                "/web/subdir/"
              ]