what to do when you got a PURPLE SCREEN on the ESX?

Collect these:

• A screenshot or photograph of the purple diagnostic screen on the console.
• A coredump from the VMkernel placed on disk or sent to the ESXi Dump Collector service. (normally on /var/core)
• A vm-support log bundle from the host following a reboot.

https://kb.vmware.com/s/article/1004128