Bump the activator to 3 replicas to test horizontal scalability. (#2171)
Bump the activator to 3 replicas to test horizontal scalability. (#2171)

This doesn't address https://github.com/knative/serving/issues/1625, for which we need HPA, but it is intended to probe the horizontal scalability.

Fixes: https://github.com/knative/serving/issues/695
knative/serving,knative/serving