y services from another namespace.</p><p>In our Bookinfo sample, the <code>productpage</code>, <code>reviews</code>, <code>details</code>, <code>ratings</code> services are deployed in the <code>default</code> namespace.
The Istio components like <code>istio-ingressgateway</code> service are deployed in the <code>istio-system</code> namespace. We can define a policy that
any service in the <code>default</code> namespace that has the <code>app</code> label set to one of the values of
<code>productpage</code>