The podsinmesh vetter counts the number of Pods in/out of the mesh which can be
useful for detecting misconfigurations or policy violations.
This vetter counts all user Pods (not in namespaces kube-system,
kube-public, istio-system) and reports the number of Pods in the mesh. Pods
are considered in the mesh if they have the correct initializer annotations and
sidecar proxy injected.
It also counts the system Pods (in namespaces kube-system, kube-public,
istio-system) and reports the number of running system pods which are
exempted from the mesh.