User will not be able to view the monitoring data for NSDs. They will be seeing an empty page.
VCO 6.0
Whenever we have a datacenter data without tunnel Mode field, user can see this issue happening.
Add the tunnelMode field to all the datacenter data missing tunnelMode field and update the enterprise service or just do some changes on the configure page of NSD via gateway for all the datacenter missing tunnelMode field and save it in the UI.
Issue is tracked under the bug ID 144622. The defect is fixed in the VCO releases 6.0.0.6 and 6.1