Kubernetes v1.36: New Metric for Route Sync in the Cloud Controller Manager

Kubernetes v1.36 introduces a new alpha counter metric to track route syncs with cloud providers. This metric helps validate a feature gate that switches the route controller to a watch-based approach, reducing unnecessary API calls. To test, compare the metric with the feature gate disabled and enabled. In stable clusters, the watch-based approach should show a significant drop in sync rate. For more details, refer to KEP-5237.