Merge pull request #4677 from Azure/raelg/kubelet-image-gc-thresholds

infra: lower kubelet image GC thresholds to 70/60

Author: openshift-merge-bot[bot]

dev-infrastructure/modules/aks-cluster-base.bicep

@@ -86,6 +86,8 @@ param dnsPrefix string = aksClusterName
 param systemOsDiskSizeGB int
 param userOsDiskSizeGB int
 param infraOsDiskSizeGB int
+param imageGcHighThreshold int = 70
+param imageGcLowThreshold int = 60
 
 @description('The resource IDs of ACR instances that the AKS cluster will pull images from')
 param pullAcrResourceIds array = []
@@ -308,6 +310,10 @@ resource aksCluster 'Microsoft.ContainerService/managedClusters@2025-07-02-previ
         enableFIPS: true
         enableNodePublicIP: false
         kubeletDiskType: 'OS'
+        kubeletConfig: {
+          imageGcHighThreshold: imageGcHighThreshold
+          imageGcLowThreshold: imageGcLowThreshold
+        }
         osDiskType: 'Ephemeral'
         osDiskSizeGB: systemOsDiskSizeGB
         minCount: systemAgentMinCount

dev-infrastructure/modules/aks/pool.bicep

@@ -13,6 +13,8 @@ param vmSize string
 param minCount int
 param maxCount int
 param osDiskSizeGB int
+param imageGcHighThreshold int = 70
+param imageGcLowThreshold int = 60
 
 param vnetSubnetId string
 param podSubnetId string
@@ -94,6 +96,10 @@ resource userAgentPools 'Microsoft.ContainerService/managedClusters/agentPools@2
       enableFIPS: true
       enableNodePublicIP: false
       kubeletDiskType: 'OS'
+      kubeletConfig: {
+        imageGcHighThreshold: imageGcHighThreshold
+        imageGcLowThreshold: imageGcLowThreshold
+      }
       osDiskType: 'Ephemeral'
       osDiskSizeGB: osDiskSizeGB
       count: minCount