This message occurs when you have a namespace that is missing the annotation to indicate whether the namespace is auto-injected, for example

For example, you receive this error:

Warn [IST0102] (Namespace default) The namespace is not enabled for Istio
injection. Run 'kubectl label namespace default istio-injection=enabled' to
enable it, or 'kubectl label namespace default istio-injection=disabled' to
explicitly mark it as not needing injection Error: Analyzer found issues.

To resolve this problem, use an annotation to explicitly declare whether or not you want the namespace to be auto-injected. For example:

$ kubectl label namespace <namespace-name> istio-injection=enabled

It is strongly recommended to explicitly define the desired injection behavior. Forgetting to annotate a namespace is a common cause of errors.