code: def create_instance(self, name, template, args=None, labels=None):
          
          req = rest_pb2.CreateInstanceRequest()
          req.name = name
          req.template = template
          if args:
              for k in args:
                  req.templateArgs[k] = args[k]
          if labels:
              for k in labels:
                  req.labels[k] = labels[k]
          url = '/instances'
          self.post_proto(url, data=req.SerializeToString())
docs: Create a new instance based on an existing template. This method blocks
          until the instance is fully started.
  
          :param str instance: A Yamcs instance name.
          :param str template: The name of an existing template.