what configuration is required to control which nodes in a cluster an agent runs.

 Node Association: To control which nodes in a cluster an agent runs on, you need to associate the agent with specific node types. This ensures that the agent runs only on the nodes that match the specified type.

 Configuration: In the agent rule configuration, specify the node type under the "Node" settings. This allows for precise control over the agent's execution environment.

References:

Pega Academy: Configuring Agents for Node Types

Pega Documentation: Agent Configuration and Node Types