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(opt) Use DefaultTransform to get rid of managedFields in cached object #1568

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Merged
gianlucam76 merged 1 commit into from
Dec 24, 2025
Merged

(opt) Use DefaultTransform to get rid of managedFields in cached object #1568

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45 changes: 37 additions & 8 deletions cmd/main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,7 @@ import (
corev1 "k8s.io/api/core/v1"
apiextensionsv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/types"
Expand Down Expand Up @@ -100,12 +101,11 @@ var (
)

const (
addonComplianceTimer = 5
defaultReconcilers = 10
defaultWorkers = 20
defaulReportMode = int(controllers.CollectFromManagementCluster)
mebibytes_bytes = 1 << 20
gibibytes_per_bytes = 1 << 30
defaultReconcilers = 10
defaultWorkers = 20
defaulReportMode = int(controllers.CollectFromManagementCluster)
mebibytes_bytes = 1 << 20
gibibytes_per_bytes = 1 << 30
)

// Add RBAC for the authorized diagnostics endpoint.
Expand Down Expand Up @@ -138,8 +138,9 @@ func main() {
Port: webhookPort,
}),
Cache: cache.Options{
SyncPeriod: &syncPeriod,
ByObject: byObject,
SyncPeriod: &syncPeriod,
ByObject: byObject,
DefaultTransform: reduceMemoryFootprint,
},
Client: client.Options{
Cache: &client.CacheOptions{
Expand Down Expand Up @@ -696,3 +697,31 @@ func printMemUsage(logger logr.Logger) {
func bToMb(b uint64) uint64 {
return b / mebibytes_bytes
}

// reduceMemoryFootprint removes large, rarely-used fields from all cached objects
func reduceMemoryFootprint(obj interface{}) (interface{}, error) {
accessor, err := meta.Accessor(obj)
if err != nil {
return obj, nil
}

// Remove managedFields (typically the largest field)
accessor.SetManagedFields(nil)

// Clean up annotations
annotations := accessor.GetAnnotations()
if len(annotations) > 0 {
// Remove large annotations
delete(annotations, "kubectl.kubernetes.io/last-applied-configuration")
delete(annotations, "deployment.kubernetes.io/revision")

// If annotations is now empty, set to nil
if len(annotations) == 0 {
accessor.SetAnnotations(nil)
} else {
accessor.SetAnnotations(annotations)
}
}

return obj, nil
}