Upgraded to 20.3.10324 (18th March 2020) yesterday.  When I go to Ports -> Customers  (which worked before I upgraded) I see the attached image.

If I hover on the port or device, the correct graph comes up.  Other graphs under Ports -> Transit for example work fine.  I don't believe we've customized the customer graphs at all, I was always under the impression Observium auto generated all of that.