It is inconsistent and confusing to report pod count from all
namespaces but report message for only default namespace.
Added the namespace (default) reporting to clarify this.
Updated comments for usage clarity.
Kubernetes-commit: 31e427b54c500f2e532ebeb1990eb7580bf86729
Also add authenticate- prefix to auth samples.
Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>
Kubernetes-commit: 62d1251874cb259d38d727300ac4b2646c4122c8