The Cluster Control Protocol (CCP) is responsible for managing the synchronization of state information between the members of a cluster. This includes state reporting (monitoring the state of cluster members) and state synchronization (ensuring that session state information is replicated across the cluster nodes). These roles are critical to ensuring high availability and proper failover within the cluster.

Vertical scaling, also called scaling up and down, means changing the capacity of a resource.

AWS Auto Scaling is the service that monitors applications and automatically adjusts capacity to maintain steady, predictable performance at the lowest possible cost. It enables you to scale your resources up or down based on the demand, ensuring that you have the right amount of capacity for your application at any given time.

Azure Resource Manager (ARM) is the deployment and management service for Azure. It provides a management layer that allows you to create, update, and delete resources in your Azure account. ARM enables you to organize resources and manage them through templates, and also supports role-based access control (RBAC) and automation features.