The upstream feature "Scale up minimum" is not available in our documentation and should be added.
There is a customer looking for it, Slack thread: https://redhat-internal.slack.com/archives/CF5ANN61F/p1692780540106469

Ideally, we can add all upstream configs that are missing in our official docs, see the following links to compare:

Upstream docs:
https://knative.dev/docs/serving/autoscaling/scale-bounds/#scale-up-minimum

Downstream docs:
https://docs.openshift.com/serverless/1.28/knative-serving/autoscaling/serverless-autoscaling-developer-scale-bounds.html