Storm provides hooks with which you can insert custom code to run on any number of events within Storm. You create a hook by extending the BaseTaskHook class and overriding the appropriate method for the event you want to catch. There are two ways to register your hook:

1. In the open method of your spout or prepare method of your bolt using the TopologyContext method.
2. Through the Storm configuration using the "topology.auto.task.hooks" config. These hooks are automatically registered in every spout or bolt, and are useful for doing things like integrating with a custom monitoring system.