code: def check_health(self):
      if not self._my_db_connection.is_connected():
          # The specific type of exception is not important.
          raise RuntimeError("uh-oh, DB connection is broken.")
  
imports: from ray import serve
label_desc: Use image node_id 3 for calling the MyDeployment obj's underlying member method code with example usage: obj.check_health() without return types