Merge pull request kubernetes#2711 from salaxander/prr_docs

added readme for PRR process

Author: k8s-ci-robot

hack/.notableofcontents

@@ -1,4 +1,5 @@
 keps/README.md
+keps/prod-readiness/README.md
 keps/sig-cli/FAQ.md
 keps/sig-cluster-lifecycle/clusterapi/FAQ.md
 keps/sig-cluster-lifecycle/kubeadm/970-kubeadm-config/documentation-for-images.md

keps/prod-readiness/README.md

@@ -0,0 +1,22 @@
+# Production Readiness Reviews
+
+Production readiness reviews (PRRs) are intended to ensure that enhancements
+merging into Kubernetes are observable, scalable and supportable, can be safely
+operated in production environments, and can be disabled or rolled back in the
+event they cause increased failures in production.
+
+While approvals for an enhancement are still required from the respective SIG,
+production readiness reviews are done by the [Production Readiness subproject][prod-readiness] of SIG Architecture.
+
+It is useful to have the viewpoint of a team that is not as familiar with the
+intimate details of the SIG, but is familiar with Kubernetes and with operating
+Kubernetes in production.
+
+Experience through our dry runs in the Kubernetes 1.17 - 1.20 release cycles
+has shown that this slightly "outsider" view helps identify otherwise missed
+items.
+
+Full documentation on the production readiness review process can be found on
+the SIG Architecture page [here][prod-readiness].
+
+[prod-readiness]: https://git.k8s.io/community/sig-architecture/production-readiness.md