Feature request: allow displaying all namespaces

[Cubxity]

In some cases, it may be useful to visualize network traffic in all namespaces at the same time. Relevant Slack discussion here.

[adamcharnock]

This would be super helpful to me when looking for dropped packets when running in Audit mode.

[mattcharlton]

We've just moved to separate namespaces for our apps from a singular apps namespace.

This would allow us to see dropped packets and adjust policies much easier.

[Exeteres]

I think this is a vital feature for analyzing traffic between namespaces.
I'm surprised it still doesn't exist.
It would also be convenient to select several namespaces and view them in a single boundary.

[alephpt]

Not only would it be useful, it would be cool.

It would be cool to see a graph of all namespaces.