Remove feature flag, add prod-readiness, set to implementable

Author: kevindelgado

keps/prod-readiness/sig-api-machinery/2885.yaml

@@ -0,0 +1,3 @@
+kep-number: 2885
+alpha:
+        approver: "@smarterclayton"

keps/sig-api-machinery/2885-server-side-unknown-field-validation/README.md

@@ -631,11 +631,11 @@ This section must be completed when targeting alpha to a release.
 
 <!--
 Pick one of these and delete the rest.
--->
 
 - [x] Feature gate (also fill in values in `kep.yaml`)
   - Feature gate name: UnknownFieldValidation
   - Components depending on the feature gate: kube-apiserver
+-->
 - [x] Other
   - Describe the mechanism: query parameter
   - Will enabling / disabling the feature require downtime of the control
@@ -649,8 +649,8 @@ No, strict validation is false by default.
 
 ###### Can the feature be disabled once it has been enabled (i.e. can we roll back the enablement)?
 
-Yes, disabling the feature flag will cause us to ignore the validation query
-param, effectively rolling back this feature.
+Yes, not setting the query param will ensure we are not doing strict validation
+(i.e. disable the feature)
 
 ###### What happens if we reenable the feature if it was previously rolled back?
 

keps/sig-api-machinery/2885-server-side-unknown-field-validation/kep.yaml

@@ -4,13 +4,13 @@ authors:
   - "@kevindelgado"
 owning-sig: sig-api-machinery
 participating-sigs:
-status: provisional
+status: implementable
 creation-date: 2021-08-20
 reviewers:
   - "@apelisse"
   - "@jpbetz"
 approvers:
-  - "@lavalamp"
+  - "@smarterclayton"
 
 ##### WARNING !!! ######
 # prr-approvers has been moved to its own location
@@ -38,10 +38,6 @@ milestone:
 
 # The following PRR answers are required at alpha release
 # List the feature gate name and the components for which it must be enabled
-feature-gates:
-  - name: UnknownFieldValidation
-    components:
-      - kube-apiserver
 disable-supported: true
 
 # The following PRR answers are required at beta release