From 02f21344ac89b3cc5357db50e931f68222c187b0 Mon Sep 17 00:00:00 2001
From: Nilekh Chaudhari <1626598+nilekhc@users.noreply.github.com>
Date: Thu, 4 Jan 2024 19:34:05 +0000
Subject: [PATCH] feat: implements svm controller

Signed-off-by: Nilekh Chaudhari <1626598+nilekhc@users.noreply.github.com>

Kubernetes-commit: 9161302e7fd3a5fb055b2f2572c6e1228240bb51
---
 features/known_features.go     | 7 ++++++-
 tools/cache/shared_informer.go | 6 ++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/features/known_features.go b/features/known_features.go
index 329eed72..0c972a46 100644
--- a/features/known_features.go
+++ b/features/known_features.go
@@ -37,6 +37,10 @@ const (
 	//  The feature is disabled in Beta by default because
 	//  it will only be turned on for selected control plane component(s).
 	WatchListClient Feature = "WatchListClient"
+
+	// owner: @nilekhc
+	// alpha: v1.30
+	InformerResourceVersion Feature = "InformerResourceVersion"
 )
 
 // defaultKubernetesFeatureGates consists of all known Kubernetes-specific feature keys.
@@ -45,5 +49,6 @@ const (
 // After registering with the binary, the features are, by default, controllable using environment variables.
 // For more details, please see envVarFeatureGates implementation.
 var defaultKubernetesFeatureGates = map[Feature]FeatureSpec{
-	WatchListClient: {Default: false, PreRelease: Beta},
+	WatchListClient:         {Default: false, PreRelease: Beta},
+	InformerResourceVersion: {Default: false, PreRelease: Alpha},
 }
diff --git a/tools/cache/shared_informer.go b/tools/cache/shared_informer.go
index a06df6e6..c805030b 100644
--- a/tools/cache/shared_informer.go
+++ b/tools/cache/shared_informer.go
@@ -31,6 +31,8 @@ import (
 	"k8s.io/utils/clock"
 
 	"k8s.io/klog/v2"
+
+	clientgofeaturegate "k8s.io/client-go/features"
 )
 
 // SharedInformer provides eventually consistent linkage of its
@@ -409,6 +411,10 @@ func (v *dummyController) HasSynced() bool {
 }
 
 func (v *dummyController) LastSyncResourceVersion() string {
+	if clientgofeaturegate.FeatureGates().Enabled(clientgofeaturegate.InformerResourceVersion) {
+		return v.informer.LastSyncResourceVersion()
+	}
+
 	return ""
 }