Merge pull request kubernetes#4065 from helayoty/scheduling-gates-3521

KEP-3521: Add new metric for excluding PreEnqueue duration time

Author: k8s-ci-robot

keps/sig-scheduling/3521-pod-scheduling-readiness/README.md

@@ -965,8 +965,7 @@ Pick one more of these and delete the rest.
 Describe the metrics themselves and the reasons why they weren't added (e.g., cost,
 implementation difficulties, etc.).
 -->
-
-N/A.
+Yes, a new metric `pod_scheduling_sli_duration_seconds` to explicitly revealing the SLI-related metric, it excludes the time spent during `PreEnqueue`.
 
 ### Dependencies