One more instance of metric import (#7949)
One more instance of metric import (#7949)

https://prow.knative.dev/view/gcs/knative-prow/pr-logs/pull/knative_serving/7947/pull-knative-serving-integration-tests/1260714393864245248
extracted from here.
This file is used by everything, so should be good
knative/serving,knative/serving