I would like to see all resources in a namespace.
Doing kubectl get all will, despite of the name, not list things like services and ingresses.
kubectl get all
All kubernetes objects are stored in etcd.
All objects are stored in ETCD v3 the following way:
/registry///
I suggest just to take the list of all resources of some namespace from etcd v3 directly:
ETCDCTL_API=3 etcdctl --endpoints=:2379 get / --prefix --keys-only | grep -E "^/\w+/\w+//+"