Running in Loki-less mode, clicking Node or Network (UDN enabled) results in an error message that is impossible to clear.   Things attempted:

- Go back to network summary view
- Reload browser page
- log out/in to console

Only a cache clear helps.  I would expect to be able to recover a usable network observability view without the cache clear.  This happens on Chrome and FF 

Can't build query: this request could not be performed with Prometheus 
metrics, as they are missing some of the required labels. Try using 
different filters and/or aggregations. For example, try removing these 
dependencies from your query: SrcK8S_HostName, DstK8S_HostName. 
Alternatively, you may also install and enable Loki

Dev tools doesn't show much.   Before the bad click there are repeated periodic messages with:

"netflow-traffic.ts:100 ProgressStep: The titleId and id properties are required to make this component accessible, and one or both of these properties are missing."

After the bad click, there is:

1. Install NetObserv Loki-less (I used 1.10 on OCP 4.20 but I have seen this with 1.9.3 on 4.19)
2. Go to the Network Observability Topo view
3. Click Node in the hierarchy

Error message with no way to get free of it without cache clear.