The warning 'Virtual Machine disks consolidation is needed' in the Summary tab of a virtual machine in the VMware vSphere console means that when deleting a snapshot (using the option Delete or Delete All), the snapshot VMDK files or logs have not been deleted correctly (remain on the storage).
https://ibmimedia.com/blog/213/vmware-virtual-machine-disks-consolidation-is-needed-error
vmware disk consolidation failed file locked
vmware disk consolidation needed no #snapshots
virtual machine disks consolidation failed
vmware disk consolidation #performance impact
#vmware disk consolidation taking a long time
#disk consolidation meaning
consolidate virtual machine disk files stuck
consolidate snapshots greyed out