code: def _get_counter_prefix_from_socket_name(self, name):
          
          base = os.path.splitext(os.path.basename(name))[0]
          if base.startswith(self.config['socket_prefix']):
              base = base[len(self.config['socket_prefix']):]
          return 'ceph.' + base
docs: Given the name of a UDS socket, return the prefix
          for counters coming from that source.