Update implementation history and milestones

Author: ehashman

keps/sig-node/2238-liveness-probe-grace-period/README.md

@@ -529,6 +529,9 @@ _This section must be completed when targeting beta graduation to a release._
 - 2021-01-07: Initial draft KEP
 - 2021-03-11: Alpha implementation
   ([kubernetes/kubernetes#99375](https://github.com/kubernetes/kubernetes/pull/99375))
+- 2021-07-13: Beta updates ([k/k#103168](https://github.com/kubernetes/kubernetes/pull/103168))
+- 2021-07-13: Add validation ([k/k#103245](https://github.com/kubernetes/kubernetes/pull/103245))
+- 1.25 cycle: default feature flag to true ([k/k#108541](https://github.com/kubernetes/kubernetes/pull/108541))
 
 ## Drawbacks
 

keps/sig-node/2238-liveness-probe-grace-period/kep.yaml

@@ -23,13 +23,13 @@ stage: beta
 # The most recent milestone for which work toward delivery of this KEP has been
 # done. This can be the current (upcoming) milestone, if it is being actively
 # worked on.
-latest-milestone: "v1.22"
+latest-milestone: "v1.25"
 
 # The milestone at which this feature was, or is targeted to be, at each stage.
 milestone:
   alpha: "v1.21"
   beta: "v1.22"
-  stable: "v1.25"
+  stable: "v1.27"
 
 # The following PRR answers are required at alpha release
 # List the feature gate name and the components for which it must be enabled