This dashboard can help you to list if there are VMs with idle or wasting resources.
See here the dashboard picture http://geeklady.com.br/index.php/2020/01/04/procurando-por-vms-zumbis/
The attached file contains:
Dashboard Zombies VMs View - VM Idle View - Datastores with Wasted Disk Space View - Oversized Virtual Machines View - VM Off View - VM Network Idle
Download the zip file, extract the files. Import the views and the dashboard.
When you open the dashboard, select the cluster and you can see some informations:
- Power On VMs but Idle - VMs with Network Idle - Power Off VMs and the cost - Oversized VMs, so you can decide to optimize resource to keep your environment happy