chore: add bottlerocket support for kubeletconfiguration evictionsoft

pkg/providers/amifamily/bootstrap/bottlerocket.go

@@ -64,6 +64,9 @@ func (b Bottlerocket) Script() (string, error) {
 		if b.KubeletConfig.EvictionHard != nil {
 			s.Settings.Kubernetes.EvictionHard = b.KubeletConfig.EvictionHard
 		}
+		if b.KubeletConfig.EvictionSoft != nil {
+			s.Settings.Kubernetes.EvictionSoft = b.KubeletConfig.EvictionSoft
+		}
 		if b.KubeletConfig.ImageGCHighThresholdPercent != nil {
 			s.Settings.Kubernetes.ImageGCHighThresholdPercent = lo.ToPtr(strconv.FormatInt(int64(*b.KubeletConfig.ImageGCHighThresholdPercent), 10))
 		}

pkg/providers/amifamily/bootstrap/bottlerocketsettings.go

@@ -54,6 +54,7 @@ type BottlerocketKubernetes struct {
 	MaxPods                            *int                                      `toml:"max-pods,omitempty"`
 	StaticPods                         map[string]BottlerocketStaticPod          `toml:"static-pods,omitempty"`
 	EvictionHard                       map[string]string                         `toml:"eviction-hard,omitempty"`
+	EvictionSoft                       map[string]string                         `toml:"eviction-soft,omitempty"`
 	KubeReserved                       map[string]string                         `toml:"kube-reserved,omitempty"`
 	SystemReserved                     map[string]string                         `toml:"system-reserved,omitempty"`
 	AllowedUnsafeSysctls               []string                                  `toml:"allowed-unsafe-sysctls,omitempty"`

pkg/providers/amifamily/bottlerocket.go

@@ -122,7 +122,6 @@ func (b Bottlerocket) FeatureFlags() FeatureFlags {
 	return FeatureFlags{
 		UsesENILimitedMemoryOverhead: false,
 		PodsPerCoreEnabled:           false,
-		EvictionSoftEnabled:          false,
 		SupportsENILimitedPodDensity: true,
 	}
 }

test/suites/ami/suite_test.go

@@ -282,6 +282,7 @@ var _ = Describe("AMI", func() {
 			actualUserData, err := base64.StdEncoding.DecodeString(*getInstanceAttribute(pod.Spec.NodeName, "userData").UserData.Value)
 			Expect(err).ToNot(HaveOccurred())
 			Expect(string(actualUserData)).To(ContainSubstring("kube-api-qps = 30"))
+			Expect(string(actualUserData)).To(ContainSubstring("memory.available = 300Mi"))
 		})
 		// Windows tests are can flake due to the instance types that are used in testing.
 		// The VPC Resource controller will need to support the instance types that are used.

test/suites/ami/testdata/br_userdata_input.sh

@@ -2,3 +2,5 @@
 kube-api-qps = 30
 [settings.kubernetes.node-taints]
 "node.cilium.io/agent-not-ready" = ["true:NoExecute"]
+[settings.kubernetes.eviction-soft]
+"memory.available" = "300Mi"