When network-traffic menu is accessed from one of the workloads page (pods/deployments/replicaset etc) , the first request just buffers to get data until "refresh" is set/hit to make another request to get data.

1. After Deploying NOO, flowcollector, Navigate to workloads page, click on Pods --> select a any Pod
2. Click on Network Traffic option (ensure refresh is off)
3. The panels on overview page will wait indefinitely 

first request to fetch data waits indefinitely

data should be loaded in first request.