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Kubernetes v1.36: New Metric for Route Sync in the Cloud Controller Manager
Kubernetes v1.36 ships a metric specifically to A/B test whether watch-based route reconciliation cuts cloud provider API calls.
What: Kubernetes v1.36 introduces route_controller_route_sync_total, an alpha counter metric in the Cloud Controller Manager by Lukas Metzner (Hetzner). It tracks route syncs to cloud providers, letting operators compare API call volume with the CloudControllerManagerWatchBasedRoutesReconciliation feature gate (v1.35) enabled versus disabled.
Decoder
- KEP: Kubernetes Enhancement Proposal—the design document process for new K8s features
- Feature gate: Kubernetes configuration flag that toggles alpha/beta features on/off for testing and gradual rollout
Original article
Kubernetes v1.36 added a new alpha metric called route_controller_route_sync_total to help operators measure the impact of the watch-based route reconciliation feature introduced in v1.35.
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