I'm using Istio 1.6.4 (with its embedded Prometheus version) and Kiali 1.24. I have a problem in the inbound/outbound metrics tabs.
When there is no traffic, three charts (request volume, request throughput and response throughput) are fine (i.e. empty), but the other five charts display a "No data available" message.
When there is traffic, the same three charts are fine (i.e. there are graphs), and the other five charts are empty. When I hover the mouse over them, I see the points that must be in the graphs.