If there is an Avi DNS virtual service configured with both TCP and UDP network profiles (via network profile override), the virtual service analytics (DNS Queries, Throughput, etc.) may fail to load.
This is caused due to a bug in the workflow of metrics being sent from the service engine to the controller.
Unfortunately, there is no workaround for this issue.
The issue is fixed in Avi version 30.2.6 and later.