The sugar controller is an optional reconciler that watches for labels and annotations on certain resources to inject eventing components.
To enable injection on a single Namespace:
kubectl label namespace default eventing.knative.dev/injection=enabled
To enable injection based on a single Trigger in a Namespace:
kubectl annotate trigger mytrigger eventing.knative.dev/injection=enabled
Post deployment defaulting to always inject:
kubectl -n knative-eventing set env deployment/sugar-controller BROKER_INJECTION_DEFAULT=true