In Nutanix's Multicloud Automation (formerly known as Calm), playbooks can be configured to respond to various conditions and events that occur within the infrastructure. If a VM, such as one named ORACLE, becomes CPU constrained, a playbook can be triggered to automatically add more virtual CPUs (vCPUs) to the VM. In addition, playbooks can integrate with various notification services such as Slack, allowing administrators to be informed of the changes being made.
Based on the provided options and according to Nutanix documentation, the correct action is that the playbook will add more vCPU and will send a Slack message. This ensures that the VM's performance can be adjusted dynamically while keeping the relevant personnel informed via Slack.
References:
* Nutanix Calm Documentation
* Nutanix Multicloud Automation Playbooks Guide