https://next.nutanix.com/community-blog-154/new-x-play-actions-in-prism-central-2021-7-40005
The Prism Central Playbook Action is a tool that allows you to automate tasks based on triggers, such
as events, alerts, or webhooks. You can define a series of actions (called a playbook) that perform
operations on your infrastructure, such as adding or reducing resources on a VM2.
To use the Playbook Action for VMs, you need to meet some prerequisites, such as:
The Prism Central version must be 2020.11 or later.
The AOS version must be 5.15 LTSR or later.
The hypervisor must be AHV or ESXi.
The VMs must have Nutanix Guest Tools (NGT) installed and enabled3.
One of the possible reasons why the Playbook Action is no longer being triggered is that the virtual
desktop CPU Usage alerts were not cleared. According to the Prism Central guide3, “If an alert has
been triggered once and has not been cleared yet, then it will not trigger any action again until it has
been cleared”. Therefore, if the CPU Usage alert remains active for a virtual desktop, it will prevent
the Playbook Action from adding more vCPUs to it.