It may be helpful to determine what commands were run previously to troubleshoot a current issue. Let’s first understand what aCLIand nCLI command utilities are.

aCLI: utility to create, modify and manage VMs in AHV.

nCLI: utility to manage cluster operations.

The history files are hidden and are persistent across reboots. Below article explains how to  retrieve commands history:

https://portal.nutanix.com/page/documents/kbs/details/?targetId=kA032000000TSsjCAG 

Also, take a look at how to check cluster upgrade history:

https://next.nutanix.com/discussion-forum-14/checking-cluster-upgrade-history-37417