Virtual machine disks consolidation is needed

This morning one of my VMs was reporting that virtual machine disks consolidation is needed, as shown in the screenshot below:

I believe this was caused by a Veeam backup job, as there was also a snapshot size warning, but no snapshot was present.  This was easy to fix:

1. Right-click on the VM, select Snapshot and then Consolidate

2. Click Yes

Depending on the size of the files this may take some time.